MOPMO
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Monday Poster Session
08 Sep 2025, 16:00 -
18:00
MOPMO01
Bunch-by-bunch beam current and lifetime measurement with interleaved sampling at HLS
159
To achieve high-precision, bunch-by-bunch beam cur-rent and lifetime measurements at the Hefei Light Source (HLS), we developed a beam diagnostics system based on interleaved sampling technology, achieving an equivalent sampling rate of 6.5 GHz. In single-bunch mode, amplitude extraction via cross-correlation with a single response function yieds a turn-by-turn current relative resolution of 0.12%. By averaging over 200 turns, the resolution is improved to 0.04% at a 23 kHz data refresh rate, enabling fast and accurate lifetime calculations. However, in multi-bunch high-current mode, large longitudinal oscillations degrade the accura-cy of amplitude extraction when using a fixed-response function. We propose an integration method to mitigate the effects of bunch length and phase oscillations on beam current measurements. The method and experi-mental results provide a practical solution for machines exhibiting large longitudinal oscillations, such as HLS.
Paper: MOPMO01
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO01
About: Received: 01 Sep 2025 — Revised: 07 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO02
Design studies of a retarding potential energy analyser (RPEA) for low-energy antimatter experiments
163
Retarding Potential Energy Analysers (RPEAs) are widely used diagnostic instruments for measuring energy distribution of charged particle beams. In this work we will discuss the conceptual design studies of a novel RPEA for low-energy antimatter beams (antiprotons/positrons). Simulation tools such as CST studio and G4Beamline were used for studying the prototype RPEA and to optimize its geometry for considering different parameters such as, beam characteristics, collector geometry, the losses occurring due to secondary electrons and annihilation, grid design etc. The proposed diagnostic can offer the potential for measuring the energy and current of low-energy (1–10 keV) antiproton/positron bunches in experiments such as AEgIS, with promising energy resolution. However, further detailed studies are required to assess its viability for implementation in a practical detector system.
Paper: MOPMO02
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO02
About: Received: 26 Aug 2025 — Revised: 06 Sep 2025 — Accepted: 07 Sep 2025 — Issue date: 20 Jan 2026
MOPMO03
Development of a novel DC current monitor device, based on tunnelling magnetoresistive sensors, for ion beam current measurement
167
In this work, the development of a non-invasive DC Current Monitor device (DCCM), based on Tunnelling MagnetoResistive (TMR) sensors, is presented. The device is primarily intended for measuring the current intensity of an ion beam without the need of intercepting it (therefore not altering its characteristics), making it suitable for online current monitoring. Details are given about the design of the device and its performance assessment, namely the linearity of its static response and its frequency-domain behavior.
Paper: MOPMO03
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO03
About: Received: 15 Jul 2025 — Revised: 05 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO04
Diagnostic Contributions to the Commissioning of SLS 2.0
171
In January 2025, beam was first stored in the SLS 2.0, and by April 2025, the milestone of a 400 mA beam was reached. A variety of diagnostics were utilized to reach these milestones; for example, charge, current and loss monitors for minimizing losses and optimizing transmission and injection efficiency, polarized visible light for vertical beam size measurement, and more. This paper will highlight the contributions of the various diagnostics to the machine commissioning process.
Paper: MOPMO04
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO04
About: Received: 18 Aug 2025 — Revised: 08 Sep 2025 — Accepted: 09 Sep 2025 — Issue date: 20 Jan 2026
MOPMO05
Development of a wide dynamic range and high-precision ammeter for beamline instrumentation at SIRIUS
175
Sirius beamlines require specialized electronic devices to monitor key parameters of the photon beam, such as position and flux, through the detection of extremely low-level electrical currents. Furthermore, experiments conducted in fly-scan mode usually demand fast, high-precision low-level current measurements. To address these requirements, the development of a wide dynamic range ammeter (from 1 pA to 10 mA) has been addressed, based on a logarithmic transimpedance amplifier, eliminating the need for scale switching and featuring high precision and fast response. The proposed device converts the input current into a logarithmic output voltage and offers two operation modes: the logarithmic ammeter and the logarithmic ratiometer, both of which are particularly useful in X-ray spectroscopy experiments. This paper considers an overview of the device as well as its preliminary characterization and results, including logarithmic conformity, bandwidth, and noise.
Paper: MOPMO05
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO05
About: Received: 03 Sep 2025 — Revised: 05 Sep 2025 — Accepted: 09 Sep 2025 — Issue date: 20 Jan 2026
MOPMO06
Challenges with the beam destinations for the ESS linac
179
For the ESS linac commissioning, twelve extremely compact beam destinations were designed in place of bulky and expensive beam dumps, in order to dump [0.075, 250] MeV protons. The beam destinations were either Faraday Cups (FC) for the NCL commissioning or Insertable Beam Stops (IBS) for the SCL commissioning. Both FC and IBS are beam-intercepting devices, operated under vacuum, water cooled and movable by means of a pneumatic actuator. The **manufacturing** of FC and IBS relied on high-precision machining. The limited installation space and vacuum requirements required strict tolerances, complex welding of small components and vacuum brazing of compact cooling pipes. The **installation** of the devices themselves, their radiation shielding and portable cleanrooms were particularly challenging due to the limited space not only outside but also inside the beamline. The main challenge during the **operation** was posed by the beam power density. Radiation transport calculations allowed to minimize residual dose rates. Thermo-mechanical simulations allowed to define the operational limits thus avoiding damage to the beam destinations themselves and linac components nearby.
Paper: MOPMO06
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO06
About: Received: 28 Aug 2025 — Revised: 04 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO07
First Attila4MC simulations for the high-power proton accelerator of the European Spallation Source
183
Radiation transport simulations allow the design and operation of entire facilities such as the European Spallation Source (ESS) in Lund, Sweden. This paper summarizes three of the first applications of Attila4MC simulations to the high-power proton accelerator of ESS and its beam instrumentation. Entire linac sections and beam-interceptive instrumentation were modelled by implementing existing CAD models, relying on unstructured tetrahedral meshes and zeroing out the time spent in manually crafting MCNP6 models. As a result, it was possible to accurately quantify the beam power density within beam-interceptive devices and in turn their operational limits. Activation and 3D dose maps were computed and swiftly visualized in 3D, on top of the actual linac model. This work paves the way for e.g. advanced instrumentation design, linac operation, safe maintenance, categorization of radiation waste and future dismantling.
Paper: MOPMO07
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO07
About: Received: 26 Aug 2025 — Revised: 04 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO08
Development and Characterization of a Radiation-Tolerant Power Supply for Beam Instrumentation
186
CERN’s Beam Instrumentation Group is developing a mini-crate to host the future Beam Loss Monitor (BLM) and Beam Positioning Monitor (BPM) systems acquisition electronics at HL-LHC and SPS accelerators. For this purpose, a new power supply has been designed to meet the low noise requirements, high reliability, and availability standards for these harsh radioactive environments. This design makes use of CERN-developed ASICs and radiation-tolerant qualified COTS and follows a modular architecture for quick interventions and safe handling. The paper presents the design, prototype characterisation results, identified issues, and mitigation methods to achieve the required radiation tolerance.
Paper: MOPMO08
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO08
About: Received: 01 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO09
Robotic solution for BLM detector maintenance in high radiation areas
189
CERN’s Beam Loss Monitoring (BLM) system is essential for the protection of machine elements against energy deposition due to beam losses. The protection function relies on approximately 5000 ionisation chamber type detectors installed along all of CERN's accelerators. Some of the areas where the detectors are installed have a high background dose (above 2mSv/h). Installation and maintenance times must be minimised to ensure person-nel safety. For this reason, a new solution was designed that allows the manipulation of detectors and their sup-ports by robotic action. Every aspect of the solution has been designed to reduce intervention time, using a rapid locking mechanism and the possibility of transporting the material by robot. The paper presents the design, prototype characterisation results, identified issues, and mitigation methods developed for the automated manipulation of these detectors.
Paper: MOPMO09
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO09
About: Received: 01 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 08 Sep 2025 — Issue date: 20 Jan 2026
MOPMO10
Performance of the Cryogenic Beam Loss Monitors Developed at the LHC
192
Several systems protect the superconducting magnets of the Large Hadron Collider (LHC), which operate at -271.3C. The Beam Loss Monitoring (BLM) system is critical for detecting lost particles around the machine and reacting on their quantity and associated energy. It protects the machine from quenching and irreversible damage. To measure these losses, various detectors are used, primarily ionisation chambers (IC), but also other types of monitors depending on loss intensity. In injection and extraction areas, additional fast polycrystalline Chemical Vapor Deposition (pCVD) diamond detectors measure time structured losses. To increase sensitivity, a new detector, the cryogenic Beam Loss Monitor (CryoBLM), based on pCVD, was developed. It is mounted inside the cryostat between two superconducting magnets in the vicinity of the beam pipes and operates at cryogenic temperatures. Two CryoBLM locations in the LHC target different loss scenarios: betatron halo cleaning and luminosity losses from the CMS physics debris. This contribution presents the CryoBLM performance and comparisons with other detectors.
Paper: MOPMO10
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO10
About: Received: 03 Sep 2025 — Revised: 10 Sep 2025 — Accepted: 11 Sep 2025 — Issue date: 20 Jan 2026
MOPMO11
Machine vision cameras for beam spot analysis
196
The Canadian Light Source is a third generation synchrotron which supports 22 operational beamlines. A project to replace all beam diagnostic analog cameras with CCD cameras was initiated in 2020. Over time this project has been expanded to include beam analysis capabilities. We present an EPICS-based imaging system that uses inexpensive CCD cameras. The system computes beam parameters including strength, centroid, ellipticity, eccentricity, and angle. Analysis is performed in real time, and images can also be saved for post processing. Features, implementation details, obstacles and long term plans will be discussed.
Paper: MOPMO11
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO11
About: Received: 02 Sep 2025 — Revised: 05 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO12
Optimization of beam intensity measurement system of HIPA at PSI
200
Beam intensity measurement of high intensity proton accelerator at PSI mainly consists of several passive cavity type monitors and corresponding electronics. New VME based electronics are running in parallel for final online testing with the old CAMAC ones, which will be replaced soon. The new pre-amplifier of the VME system is suffering significant temperature-dependent drift, leading to an inaccurate measurement. Further, wrong transmission rate may lead to unexpected interlock and beam losses during operation. To address this issue many temperature compensation schemes were considered, numerous lab tests were conducted, eventually reach a temperature stabilization solution. Experimental validation demonstrates a factor of 4 reduction in temperature-induced measurement variance compared to previous implementation, achieving a temperature coefficient 166 ppm/degree for RF test signal. Furthermore, the new electronics incorporate a phase measurement of the 50.6 MHz proton bunches for beam energy monitoring. Beam tests show energy measurement consistency within ±0.15%. This implementation greatly facilitates the commissioning and status monitoring of the accelerator.
Paper: MOPMO12
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO12
About: Received: 22 Aug 2025 — Revised: 05 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO13
Intelligent Retrieval Systems for Accelerator Physics: Matching Retrieval Approaches to Use Cases
204
Accelerator facilities generate diverse documentation, from technical reports to structured wikis and semi-structured logbooks, which complicates efficient knowledge access. While Retrieval-Augmented Generation (RAG) offers a path toward intelligent operator assistants, no single method is universally optimal. We present three use cases from PSI: for technical documentation, naive dense retrieval with summarization provides fast and interpretable access; for the AcceleratorWiki, a graph-augmented approach improves reasoning over hierarchies and cross-references; and for ELOG, an agentic pipeline with specialized agents supports multimodal interpretation, temporal reasoning, and iterative refinement. Together, these case studies illustrate how matching retrieval paradigms to data types enables reliable, context-aware assistance in accelerator operations.
Paper: MOPMO13
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO13
About: Received: 08 Sep 2025 — Revised: 09 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO14
Development of a Faraday cup for the FETS-FFA
208
The proposed FETS-FFA would exhibit high-intensity operation of a Fixed-Field Alternating Gradient (FFA) accelerator, as a demonstrator for a spallation neutron source driver. Faraday cups are planned to be installed in the injection straight to investigate injection efficiency and infer beam-position during early commissioning stages; and in the extraction line to inspect extraction efficiency. The chosen Faraday cup design must be suitable for the 3-12 MeV proton energy range, the average beam power of the FETS Linac and the FETS-FFA's extracted beam. Thermal aspects of this design will be introduced, including cooling water flow-rate calculations and an approximate method of simulating this flow with equivalent convective cooling. The 3D tracking for a secondary electron suppressor will also be presented, as well as calculations to estimate the required suppression voltage.
Paper: MOPMO14
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO14
About: Received: 24 Aug 2025 — Revised: 06 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO15
Beam Instrumentation for the new linear accelerator at the Canadian Light Source
212
The Canadian Light Source (CLS) linear accelerator (linac) serves as the injector for the 2.9 GeV synchrotron. The original linac, which was installed in the 1960's, was replaced in 2024. The new 3000.24 MHz linac was designed and built by RI Research Instruments GmbH. The linac makes use of a 90 kV thermionic source, three 5m long accelerating S-band structures and a SLED pulse compressor system to accelerate electrons to 250 MeV. The initial beam instrumentation included a faraday cup, yag screens, beam position monitors and fast current transformers. During the course of commissioning directional couplers and microphones were added to provide insight into the location of RF breakdowns. This paper will provide an overview of the new linear accelerator and our experience commissioning the new equipment.
Paper: MOPMO15
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO15
About: Received: 03 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 11 Sep 2025 — Issue date: 20 Jan 2026
MOPMO16
Joint analysis of beam loss and beam position during the injection process at Hefei light source
215
The Hefei Light Source is a synchrotron radiation facility operating in the vacuum ultraviolet and soft X-ray regions. If the evolution of beam parameters and beam loss during the injection transient process can be observed synchronously, analyzing their correlation can provide more quantitative guidance for further optimizing the injection process. To achieve this goal, a monitoring system capable of synchronously capturing the 3D position of each bunch and rapid beam loss has been established at the Hefei Light Source. Experiments investigated both TOP-UP injection and empty-ring injection processes. Thanks to the unique multi-parameter synchronous diagnosis capability of this system, some previously unnoticed special phenomena have been captured, and a deeper analysis of the correlation between bunch parameters can be conducted. TOP-UP mode exhibited maximum beam loss in the injected bunch, with secondary losses at the 14th subsequent bunch. Peak beam loss occurred immediately after injection in both modes, followed by rapid attenuation within several turns. Loss resurgence appeared after ~85 turns (TOP-UP) or 180 turns (empty ring), followed by oscillatory decay.
Paper: MOPMO16
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO16
About: Received: 31 Aug 2025 — Revised: 07 Sep 2025 — Accepted: 09 Sep 2025 — Issue date: 20 Jan 2026
Development of an Integrated Control and Monitoring System for Centralized Beam Operation at RAON
RAON is a heavy-ion accelerator supporting a wide range of beam energies and charge states. An integrated operational environment has been developed to enable centralized control and monitoring of accelerator systems. Machine states are defined through a structured framework combining source, machine, and beam modes, providing clear visibility of system readiness via an EPICS-based architecture. The beam permit system monitors the real-time status of cryogenics, vacuum, RF, and beam diagnostics, and inhibits beam extraction under unsafe conditions. Interlock logic is supported by a Readiness Manager and IOC monitor, while a post-mortem system captures PV data at the time of beam failure for root-cause analysis. A user interface built on the Phoebus platform offers integrated access to operation logs, alarm handling, and save-and-restore functionality. Additionally, operation time tracking and event-based logging support systematic record-keeping. This framework enhances operational efficiency and lays a foundation for future automation of beam delivery and diagnostics at RAON.
X-RAY CHARACTERIZATION OF A HIGH-ENERGY Gd2O2S FLAT PANEL FOR ELSA FACILITY
The ELSA facility located at CEA DAM DIF consists of a 30 MeV, 15 ps rms, 1 nC compact linac. X-rays are produced either in the MeV energy range through interaction between the electron beam and a solid Ta conversion target (Bremsstrahlung radiation) or in the 10-80 keV energy domain through interactions between electrons with a Nd:YAG laser (inverse Compton Scattering radiation). ELSA is dedicated to X-ray test of detectors and thus requires a good knowledge of the X-ray beam. We present here a spatial ans spectral characterization of a new high energy flat panel detector devoted to the X-ray beam parameter measurements. This characterization was achieved with X-ray portable generators and radioactive sources. A methodology for using this flat panel in dosimetry measurements is also proposed and scheduled for experimental validation on ELSA in 2025.
MOPMO19
The new SLS 2.0 booster-to-ring transfer line – design criteria, diagnostics layout and first beam results
219
Due to the limited transverse acceptance of 4th generation light sources, the characterization and control of the incoming beam from the booster to the storage ring is an important asset to achieve highly efficient and reproducible injection. For the upgraded SLS 2.0 storage ring, a new booster-to-ring transfer line (BRTL) has been designed, which includes a non-dispersive section for beam parameter measurements and a double-BPM-corrector configuration for position and angle feedback of the injected beam. Based on the BRTL design criteria, first beam results during SLS 2.0 commissioning are presented, including experience with quadrupole scans to document emittance exchange at the end of the booster ramp and steering-stabilization of the beam at the injection point, resulting in a step-wise optimization of transmission into the storage ring.
Paper: MOPMO19
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO19
About: Received: 28 Aug 2025 — Revised: 09 Sep 2025 — Accepted: 09 Sep 2025 — Issue date: 20 Jan 2026
MOPMO20
Beam loss monitoring system at SOLARIS
223
SOLARIS storage ring has been equipped with a set of twelve Beam Loss Detectors, controlled by Libera Beam Loss Monitors. This system enhances the ability to monitor and analyze beam losses and operational efficiency. Detectors were strategically placed around storage ring and transfer line, providing ability to optimize injection losses and enable precise localization of beam loss events. Real-time monitoring enables faster identification and mitigation of abnormal loss patterns, improving machine protection, stability and reliability. Data collected by the system will support beam lifetime studies and provide valuable insights for future performance.
Paper: MOPMO20
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO20
About: Received: 03 Sep 2025 — Revised: 05 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
MOPMO21
Beam diagnostic signal processor for SHINE
227
SHINE has developed different signal processors for beam diagnostics, including processors for cold button beam position monitor (BPM), stripline BPM, chicane BPM, cavity BPM, cavity bunch arrival-time monitor (BAM), electro-optic BAM, CSR bunch length monitor (BLM), beam charge loss monitoring, and fast orbit feed-back system (FOFB). The processors employ a common SoC-FPGA-based digital motherboard and accommo-dates diverse applications by hosting various daughter-boards. This paper presents the design of these processors and the applications on SHINE.
Paper: MOPMO21
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO21
About: Received: 03 Sep 2025 — Revised: 10 Sep 2025 — Accepted: 17 Sep 2025 — Issue date: 20 Jan 2026
MOPMO22
Upgrade of the BPM processor for SXFEL
231
The Shanghai Soft X-ray Free Electron Laser (SXFEL) is scheduled for a digital and intelligent upgrade over the next two years, aiming to achieve fully autonomous operation. This upgrade requires timestamping the BPM measurement results in the beam diagnostics system to enable synchronous acquisition of all measurement data at SXFEL. A new prototype of the digital BPM signal processor (DBPM) has been developed based on a Zynq UltraScale+ MPSoC FPGA. In addition to high-speed data connectors for the ADC board, the design features an FMC slot to accommodate a White Rabbit timing board for receiving bunch ID and trigger signals as timestamps. It also includes 10 GB SFP ports to support high-speed data transmission between processors. In this paper, the design of the hardware, firmware, and software of the upgraded BPM signal processor is presented.
Paper: MOPMO22
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO22
About: Received: 03 Sep 2025 — Revised: 10 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
Current Development Status of Beam Diagnostics Electronics at SSRF
Shanghai Synchrotron Radiation Facility (SSRF) and Shanghai Soft X-ray FEL(SXFEL) are open to user, and the Shanghai High Repetition Rate X-ray FEL and Extreme Light Facility (SHINE) is under construction. These accelerator facilities require diverse beam diagnostics electronics to ensure their high-performance and stable operation. After more than a decade of development, the SSRF has developed beam diagnostic electronics that meet various application requirements. This poster will introduce the current progress and application status of the electronics developed at SSRF.
MOPMO24
Overview of diagnostic and instrumentation for Siam Photon Source-II
234
Siam Photon Source II (SPS-II) is a 4th-generation synchrotron light source to be constructed in Thailand, envisioned as a major synchrotron facility for Southeast Asia. It is designed with a 3 GeV low-emittance electron storage ring based on a Double Triple Bend Achromat (DTBA) lattice, with a circumference of 327.6 meters and a natural emittance of 0.97 nm·rad. The design and machine parameters have recently been carefully revised to enhance beam stability and operational reliability. In parallel, key prototypes are being developed to support smooth construction and ensure long-term performance. This paper presents the detailed specifications and a comprehensive overview of the planned beam diagnostics and instrumentation systems, along with initial results from their ongoing R&D and testing.
Paper: MOPMO24
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO24
About: Received: 31 Aug 2025 — Revised: 07 Sep 2025 — Accepted: 07 Sep 2025 — Issue date: 20 Jan 2026
MOPMO25
Operational experience with machine protection system for high current, high brightness accelerator
238
The Low Energy RHIC Electron Cooler (LEReC), the world’s first electron cooler utilizing an RF electron accelerator, was designed to operate with 1.6-2.6 MeV electron beams of up to 140 kW beam power. The LEReC successfully worked through RHIC Runs 2019-2021, substantially increasing RHIC luminosity, and has been routinely used for various studies since then. A dedicated, highly configurable Machine Protection System (MPS) is a critical part of the LEReC. This paper summarizes our experience with operating the LEReC MPS.
Paper: MOPMO25
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO25
About: Received: 02 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO26
Perfomance evaluation of tailored shielding for energy-selective neutron detection in reactor environments
242
With nuclear reactor technology rapidly advancing and the plan to raise the nuclear energy production by a factor of 4, the need for advanced detectors, geometries and shields has become apparent. The precise and reliable measurement of the neutron flux is not only relevant for the safe operation of nuclear reactors, but also for future reactor experiments essential for progressing the technology. In the presented work, simulations were performed using MCNP-6.3 to investigate the effects of various common reactor materials in different shield geometries on the performance of benchmark detectors. This was performed using a validated simulation of a 1 Ci Am/Be neutron source located at the University of Liverpool for a detailed experiment to simulation evaluation. The use of a conical shield/reflector material around the detector showed lower efficiency for the detection of thermal neutrons, and higher efficiency for the detection of fast neutrons when compared to the results for no additional material. The tailored measurement of neutrons of specific energies is highly relevant for reactor experiments on innovative technologies.
Paper: MOPMO26
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO26
About: Received: 01 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO27
The Beam Test Facility of the National Laboratories of Frascati
245
The Beam Test Facility (BTF) at the National Laboratories of Frascati provides highly configurable positron/electron beams for different type of experiments. Extracted from the DAΦNE LINAC, the beam delivers up to 49 bunches/s, with 1 to $10^{10}$ particles/bunch. Secondary beams span 25-780 MeV (electrons) and up to 550 MeV (positrons). BTF includes two experimental halls: BTFEH1, suited for high-intensity and long-term experiments, and BTFEH2, optimized for lower intensities (up to 10⁶ particles/s). Both halls feature remote-controlled movable tables, beam diagnostics, and essential services like laser alignment, networking, high-voltage support, and gas pipelines, ensuring comprehensive experimental capabilities and 24/7 user support. A notable strength of BTF lies in the user-friendly approach: beam is easily manipulated to meet users' specific needs, even during ongoing data collection. In this talk the upgrades concerning the development of a new control system based on Epik8s (EPICS on Kubernates) will be reported as well as the new improvement in beam dimension and energy loss concerning the substitution of the 500 $\mu$m BeO exit window with 120 $\mu$m Anticorodal one.
Paper: MOPMO27
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO27
About: Received: 01 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO28
UV–VIS emissions from high energy heavy ions: mechanisms and applications to single-ion detection
249
We investigate two well known ultraviolet–visible (UV–VIS) photon emission processes from highly charged uranium ions with energies of 300- 700 MeV/u. By combining theoretical models with estimates from the literature, we evaluate fluorescence yields from air and transition radiation from surfaces. Experimental studies with slow-extracted \(U^{73+}\) beam at the high-energy beam transport line at GSI–FAIR confirm the feasibility of single-ion detection, with prototype detectors achieving up to 99.5\% efficiency. These findings establish UV–VIS emission as a robust method for fast, radiation-hard single-particle counting and provide a foundation for further optimization of optical collection and detector design.
Paper: MOPMO28
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO28
About: Received: 07 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 11 Sep 2025 — Issue date: 20 Jan 2026
Diagnostics Layout for the PERLE Injector
The PERLE (Powerful Energy Recovery Linac for Experiments) project is a high current and high charge testbed for the technologies required to realise future ERLs. A 20 mA electron beam with a bunch charge of 500 pC will be accelerated to 7 MeV by the booster and injected into the ERL. To deliver the beam to the ERL loop, a three-dipole merger with variable momentum compaction has been selected. At this energy, emittance growth is dominated by space charge effects, imposing strict constraints on the beam transport and diagnostic design. This study presents the design and optimisation of the diagnostic layout within the merger, taking into account instrumentation requirements, spatial constraints, and beam dynamics considerations. Beam tracking is used to evaluate these factors and determine optimal diagnostic positioning based on measurable beam parameters. These findings support the commissioning strategy and tuning procedures of the PERLE injector.
MOPMO31
Quantum efficiency measurements and beam diagnostics test stand design for a dual-mode electron gun at ELSA
253
To support both routine operation and accelerator research at ELSA, a dual-mode dispenser-cathode based electron gun capable of thermionic emission and thermally assisted photoemission (TAPE) is being developed. A dedicated gun test stand is being designed to measure beam properties and quality, as well as quantum efficiency in the TAPE mode under operational conditions. Instrumentation will include a pepper pot emittance stage, quadrupole scan capabilities, profile measurements using screens and wire-scans or SEM grids, and bunch charge and energy spread determination. In a basic test environment, experiments were carried out at low accelerating voltages using a setup consisting of the dispenser cathode, a pickup anode, and a simple laser system with an optical shutter. The shutter enables alternating measurements of photocurrent and dark current at the anode, allowing first estimations of quantum efficiency. The influence of different cathode heating cycles on both the absolute quantum efficiency and its temporal stability was investigated with this setup. Quantum efficiency measurements under different conditions and simulations of the test beamline are presented.
Paper: MOPMO31
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO31
About: Received: 03 Sep 2025 — Revised: 07 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO32
Characterization of the radiation environment in the FCC-ee tunnel
256
The Future Circular $ \mathrm{e}^+ \mathrm{e}^- $ Collider (FCC-ee) at CERN will provide collisions at four interaction points along a 91 km long ring, with beam energies ranging from 45.6 GeV (Z pole) to 182.5 GeV ($\text{t}\bar{\text{t}}$ threshold). The radiation environment along the accelerator varies significantly, with different dominant sources depending on location and operational mode. Accurate characterization of this environment is essential for the design and placement of machine equipment, particularly electronic systems and beam instrumentation. In this study, the Monte Carlo code FLUKA is used to characterize tunnel radiation levels from the main sources, including radiative Bhabha scattering, synchrotron radiation, and beam-gas interactions. The results at the Z pole and $\text{t}\bar{\text{t}}$ threshold for both the interaction regions and arcs are presented to guide early-stage design considerations and to quantify exposure risks for electronics at potential installation locations.
Paper: MOPMO32
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO32
About: Received: 03 Sep 2025 — Revised: 05 Sep 2025 — Accepted: 06 Sep 2025 — Issue date: 20 Jan 2026
Early Prediction of System Failures at Los Alamos Nuclear Science Center (LANSCE)
Accelerators are complex systems composed of tens of thousands of individual components requiring continuous maintenance. Aging facilities such as LANSCE face an increased rate of equipment failures, resulting in costly unscheduled shutdowns for maintenance. Early identification and localization of problems along the accelerator can mitigate future failures during scheduled maintenance periods rather than emergency shutdowns. This approach will significantly enhance the facility's reliability and increase beam availability for users. We have developed a mathematical formalism to analyze all available data for a LANSCE subsystem and generate signals indicating abnormal operation. The system accounts for hidden internal correlations between various parameters, which the existing warning system does not. We report progress on developing an anomaly detection system for LANSCE by expanding predictions to all subsystems, increase LANSCE's data archiving capability by an order of magnitude, and developing algorithms to provide operators with signals indicating developing abnormalities and pinpointing problematic beamline elements.
MOPMO34
Performance Validation of High-Gradient X-Band Structures at the University of Melbourne’s X-LAB
260
The X-band Laboratory for Accelerators and Beams (X-LAB) at the University of Melbourne enables high-power testing of X-band accelerator technologies, including components for CERN’s Compact Linear Collider (CLIC). At its core is Mel-BOX, a high-gradient test stand rebuilt from CERN’s XBOX3. Two TD24 structures, previously conditioned at CERN, have been successfully re-tested, along with RF windows, SLED-I pulse compressors, and 3D-printed loads. Beam instrumentation at X-LAB includes Faraday cups with high-resolution digitizers to measure dark current and breakdown emissions. Fast time-domain measurements along the waveguide using GHz-bandwidth oscilloscopes allow localization of breakdown events. Optical fibers detect Cherenkov light near the structures, providing complementary pulse-resolved signals. These are cross-referenced with Faraday cup data to study early-stage field emission. X-LAB integrates RF testing and diagnostics to support the development of compact, high-gradient accelerator systems.
Paper: MOPMO34
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO34
About: Received: 03 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO35
Measurements of Dark Current and Breakdown Processes using Faraday Cups and Fast Digitisers at the XBand Laboratory for Accelerators and Beams (XLAB)
264
Two CLIC TD24 accelerating structures, manufactured by CERN, are undergoing high-power testing on the 12 GHz RF test stand, MelBOX, at the x-Band Laboratory for Accelerators and Beams (XLAB). Installed in late 2024, these are the first devices tested at the facility. The goal is to condition the structures for stable operation at gradients of 100 MV/m. The maximum gradient is limited by electrical breakdown—vacuum arc formation under high electric fields—which interrupts RF transmission and can damage the structure. To study breakdown dynamics and validate models of their initiation, detailed, time-resolved charge measurements are needed. Faraday cups upstream and downstream, combined with high-performance 5 GS/s, 12-bit, 3 GHz FEB digitisers, enable precise characterisation of both dark and breakdown current emissions. Fast digitiser readout allows continuous acquisition at the 400 Hz repetition rate, capturing breakdown events and several hundred preceding pulses. This dataset supports in-depth analysis of precursors. We present initial results from structure conditioning, including breakdown statistics, dark current trends, and preliminary analysis of breakdown behaviour.
Paper: MOPMO35
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO35
About: Received: 03 Sep 2025 — Revised: 10 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO36
Realization of a Faraday cup for the gun of PERLE
268
Faraday Cups have been used as diagnostic tools to measure the charged particle beam current directly. Up to now, different designs have been introduced for this purpose. In this work, a new design of Faraday Cup has been performed for the gun of PERLE, a Powerful Energy Recovery Linac to be installed at IJClab Orsay. FC's dimensions and desirable material have been considered based on PERLE Gun beam characteristics (maximum energy of 350 KeV and maximum current of 20mA). Appropriate specifications were written for this FC. In addition, the heat power generated by electron collision with FC material has been calculated and the required cooling system has been specified. The Faraday Cup is under fabrication and tests should be run early next year to measure the electron beam current out of PERLE Gun
Paper: MOPMO36
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO36
About: Received: 28 Aug 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO37
Development of CMOS beam loss monitor for Korea-4GSR
271
The beam loss monitor (BLM) is a diagnostic system designed to protect accelerator components from unexpected high-energy radiation. We have developed a cost-effective BLM system for the next-generation synchrotron light source, Korea-4GSR. The system uses plastic scintillators, optical fibers, and a CMOS camera to localize beam losses with 10 ms time resolution. Scintillators placed along the beam-line emit blue light proportional to the ionization energy deposited by beam losses. The light is transmitted through optical fibers, bundled into a 2D array, and imaged by a CMOS sensor at 100 Hz. The BLM’s sensitivity and calibration were verified using a 2 MBq Co-60 gamma-ray source. The preliminary result shows ~45 counts/GeV. Energy deposition was estimated using Geant4 simulations, and photon-to-count conversion was characterized with a calibrated LED source. The DAQ includes a built-in LED pulser for in-situ calibration of the CMOS detector and cable integrity check. This presentation outlines the system design, calibration methods, and performance results.
Paper: MOPMO37
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO37
About: Received: 07 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO38
Development of current monitor for stacking beam in FETS-FFA test ring
274
DDesign studies of the FETS-FFA demonstration ring have been conducted as part of the ISIS-II proposal for a new high-power spallation neutron source. Beam stacking has been proposed to overcome space-charge limits in an FFA, and the feasibility of this will be evaluated in the FETS-FFA test ring by stacking up to four pulses at 50 Hz. To monitor the long-pulsed current of the coasting stacked beams over around 80 ms, the demonstration monitor of large-aperture Current Transformer (CT) with a Negative Impedance Converter (NIC) amplifier is being developed. NIC amplifier compensates the decay constant of the CT signal by cancelling the resistance of the wound coil. In addition to measuring long-pulsed coasting beam currents, the feedforward system is also added in NIC amplifier to boost the frequency band up to a few MHz to enable to measure accelerating bunch currents. This paper presents a design study of a CT monitor using a NIC amplifier and a feasibility test of a demonstration monitor detects long-pulsed signals (1s).
Paper: MOPMO38
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO38
About: Received: 30 Aug 2025 — Revised: 07 Sep 2025 — Accepted: 07 Sep 2025 — Issue date: 20 Jan 2026
MOPMO39
Development of wall current monitor on FETS-FFA test ring
278
Conceptual design studies of the FETS-FFA demonstration ring have been actively performed to confirm the reliability of a Fixed Field Alternating gradient (FFA) accelerator for a future high-power spallation neutron source, called ISIS-II. A wall Current Monitor (WCM) is a choice of non-destructive intensity monitor to evaluate the circulating proton beams from 3 MeV (about 1MHz in revolution frequency) to 12 MeV(about 2MHz in revolution frequency) in the FETS-FFA test ring. As the beam orbit shifts radially with beam energy in FFAs, the aperture of FETS-FFA WCM will be about 700mm horizontally. The maximum mean circulating beam current is about 100mA and tomographic and Schottky measurements require a bandwidth of 370MHz (100 harmonics). This is a challenge for such a large monitor. A half-width demonstration WCM (demo-WCM) was designed and manufactured to benchmark numerical simulations and to understand monitor responses. Whilst measured frequency band was lower than expected, 1% intensity resolution was achieved in the demo-WCM. In this paper, the detail design study as well as the signal response of the demo-WCM will be presented.
Paper: MOPMO39
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO39
About: Received: 30 Aug 2025 — Revised: 06 Sep 2025 — Accepted: 07 Sep 2025 — Issue date: 20 Jan 2026
MOPMO40
Development of an imaging protocol for laser driven X-ray sources
282
The Extreme Photonics Applications Centre (EPAC) being built at the Central Laser Facility in the UK will utilise a 10Hz Laser Wakefield Accelerator (LWFA) to produce a tuneable x-ray source, with energies ranging from 3keV up to 10’s of MeV while maintaining a micron-scale source size and ultra-short pulse duration. Combination of such characteristics opens an opportunity for cutting-edge high-resolution industrial imaging of dense materials: battery packs, historical artifacts and dynamic processes: crack propagation, motor engines running. The primary challenge in imaging with LWFA X-ray sources stems from shot-to-shot instabilities of flux, energies and pointing. We will present an imaging protocol developed using a combination of particle-in-cell, ray tracing and Monte Carlo simulations to simulate instabilities of EPAC and correct for them in x-ray radiographic and tomographic imaging.
Paper: MOPMO40
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO40
About: Received: 02 Sep 2025 — Revised: 08 Sep 2025 — Accepted: 11 Sep 2025 — Issue date: 20 Jan 2026
MOPMO42
Measuring the effects of fast beam loss on the Advanced Photon Source Upgrade storage ring collimators
286
The Advanced Photon Source Upgrade (APS-U) storage-ring (SR) is equipped with five horizontal collimators used to intercept 6-GeV electrons during fast whole-beam aborts and protect the rest of the SR. The collimators are located in sectors 37, 38, 39, 40, and 1. A fan-out kicker (FOK) system has been installed to reduce damage to the collimators during whole-beam loss events. Since APS-U began commissioning in April 2024, dozen of these events have taken place; in most, but not all cases, the FOK system has worked properly. Turn-by-turn beam position monitors provide beam centroid dynamics data during the loss events; however, limited diagnostics prevent in situ evaluation of the collimator beam-facing jaw surfaces. During maintenance periods in August 2024 as well as January and May 2025, some of the collimators were extracted from the vacuum chamber and examined. Faint beam strike damage was observed on the S01 collimator jaw, but more significant effects were seen on the S38 jaw. Measurements of beam motion during fast aborts is presented as well as microscopy images of the S38 damage. Coupled simulations results are compared with observations.
Paper: MOPMO42
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO42
About: Received: 29 Aug 2025 — Revised: 08 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026
MOPMO43
Beam loss measurements during Injection into the Advanced Photon Source Upgrade storage ring
290
A fiber-optic (FO) beam loss montior (BLM) system, installed along the booster to storage ring (BTS) trasnport line has been useful in identifying loss locations employing time-of-flight (TOF) analysis. The BTS BLM TOF system is comprised of a pair of rad-hard, fused-silica FO cables running along either side of the BTS line at beam elevation. In the initial configuration, we measured losses at both the upstream (US) and downstream (DS) ends of the FO cable pair. However, losses further DS along the septum and injection kicker set are also of interest. We therefore added a 20-m-length, multi-strand fused-silica FO cable bundle, replacing the DS outer FO radiator input. Thus, three of the detectors are configured at the US end of their respective FO radiators. The US detector location provides lower signal but improved spatial resolution over the DS. Loss location identification has been accomplished by inserting YAG screen flags at different positions along the BTS. We present results from studies and operations.
Paper: MOPMO43
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO43
About: Received: 28 Aug 2025 — Revised: 07 Sep 2025 — Accepted: 07 Sep 2025 — Issue date: 20 Jan 2026
MOPMO45
Fermilab PIP-II machine protection system digitized data noise elimination scheme and its FPGA implementation
294
In Fermilab's PIP-II machine protection system, beam loss signals from various detectors are digitized at 125 MS/s. Noise from both high-frequency sources and low-frequency 60 Hz AC power equipment can contaminate the data. To suppress noise across these ranges—especially 60 Hz and its harmonics, which overlap with beam loss signal frequencies—advanced digital processing beyond standard filtering is required. Several real-time functional blocks were simulated and tested on an FPGA: (1) a dual time-constant discharging integrator filter, (2) a de-ripple baseline extraction and storage block, and (3) a fast-recovery discharging integrator. The nonlinear IIR integrator filter removes high-frequency noise and feeds into the baseline extractor. Upon detecting abrupt beam loss, it switches to a longer time constant to prevent baseline distortion. The de-ripple block calculates a valid baseline by averaging over multiple 60 Hz periods, storing results in a 4096-word FPGA RAM. This baseline is subtracted from raw data before integration by the fast-recovery block, which resets quickly after use. All blocks achieved expected performance and were successfully implemented on a low-cost FPGA.
Paper: MOPMO45
DOI: reference for this paper: 10.18429/JACoW-IBIC2025-MOPMO45
About: Received: 30 Aug 2025 — Revised: 09 Sep 2025 — Accepted: 10 Sep 2025 — Issue date: 20 Jan 2026