IBIC2018 - List of Keywords (proton)

Paper	Title	Other Keywords	Page
MOOB04	Upgrade of the Machine Protection System Toward 1.3 MW Operation of the J-PARC Neutrino Beamline	target, operation, FPGA, electronics	18
	K. Sakashita, M.L. Friend, K. Nakayoshi KEK, Ibaraki, Japan Y. Koshio, S. Yamasu Okayama University, Faculty of Science, Okayama City, Japan
	The machine protection system (MPS) is one of the essential components to realize safe operation of the J-PARC neutrino beamline, where a high intensity neutrino beam for the T2K long baseline neutrino oscillation experiment is generated by striking 30GeV protons on a graphite target. The proton beam is extracted from the J-PARC main ring proton synchrotron (MR) into the primary beamline. The beamline is currently operated with 485kW MR beam power. The MR beam power is planned to be upgraded to 1.3+ MW. The neutrino production target could be damaged if the high intensity beam hits off-centered on the target, due to non-uniform thermal stress. Therefore, in order to protect the target, it is important to immediately stop the beam when the beam orbit is shifted. A new FPGA-based interlock module, with which the beam profile is calculated in real time, was recently developed and commissioned. This module reads out signals from a titanium-strip-based secondary emission profile monitor (SSEM) which is placed in the primary beamline. An overview of the upgrade plan of the MPS system and the results of an initial evaluation test of the new interlock module will be discussed.
	Slides MOOB04 [8.367 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOOB04
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPA01	Status Overview of the HESR Beam Instrumentation	pick-up, impedance, instrumentation, antiproton	26
	C. Böhme, A.J. Halama, V. Kamerdzhiev, F. Klehr, B. Klimczok, M. Maubach, S. Merzliakov, D. Prasuhn, R. Tölle FZJ, Jülich, Germany
	The High Energy Storage Ring (HESR), within the Facility for Antiproton and Ion Research (FAIR), will provide proton and anti-proton beams for PANDA (Proton Antiproton Annihilation at Darmstadt) and heavy ion beams for SPARC (Stored Particles Atomic Physics Research Collaboration). With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM being in production, other BI instruments like Viewer, Scraper, or Ionization Beam Profile Monitor are in the mechanical design phase. An overview of the status is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA01
About •	paper received ※ 12 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA07	Beam Diagnostics and Instrumentation for Proton Irradiation Facility at INR RAS Linac	electron, diagnostics, radiation, linac	40
	S.A. Gavrilov, A.A. Melnikov, A.I. Titov RAS/INR, Moscow, Russia
	The new proton irradiation facility to study radiation effects in electronics and other materials has been built in INR RAS linac. The range of the specified intensity from 10⁷ to 10¹² protons per beam pulse is covered with three beam diagnostic instruments: current transformer, phosphor screen and multianode gas counter. The peculiarities of the joint use of the three instruments are described. The experimental results of beam parameters observations and adjustments are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA07
About •	paper received ※ 04 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA12	The Design and Use of Faraday Cage in Linac Temporary Line of CSNS	experiment, radiation, linac, DTL	48
	M. Meng DNSC, Dongguan, People’s Republic of China F. Li, P. Li, A.X. Wang, T.G. Xu IHEP, Beijing, People’s Republic of China J.L. Sun IHEP CSNS, Guangdong Province, People’s Republic of China
	In the end of linac temporary line in csns, we need a faraday cage to absorb the beam. in the beam experiment it will be mounted and used twice. according to the beam energy and current of csns, we choose water-cooled pipe structure with tilted panel after simulation. the main principle of the faraday cage design is to simplify the structure and reduce the radiation activation of it, to do this, we also do the simulation of radiation. to make sure the faraday cage is safe in beam experiment, we alos plug in a pt100 Platinum resistance to monitor the temperature. after faraday cage is built and mounted on the line, it works well and sustain the beam bombardment.
	Poster MOPA12 [0.471 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA12
About •	paper received ※ 03 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPB07	Beam Parameter Measurements for the J-PARC High-Intensity Neutrino Extraction Beamline	target, radiation, monitoring, extraction	85
	M.L. Friend KEK, Ibaraki, Japan
	Proton beam monitoring is absolutely essential for the J-PARC neutrino extraction beamline, where neutrinos are produced by the collision of 30 GeV protons from the J-PARC MR accelerator with a long carbon target. Continuous beam monitoring is crucial for the stable and safe operation of the extraction line high intensity proton beam, since even a single misfired beam spill can cause serious damage to beamline equipment at 2.5x10¹⁴ and higher protons-per-pulse. A precise understanding of the proton beam intensity and profile on the neutrino production target is also necessary for predicting the neutrino beam flux with high precision. Details of the suite of monitors used to continuously and precisely monitor the J-PARC neutrino extraction line proton beam will be shown, including recent running experiences, challenges, and future upgrade plans.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB07
About •	paper received ※ 07 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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MOPC04	Beam Charge Measurement and System Calibration in CSNS	target, extraction, electronics, operation	122
	W.L. Huang, F. Li IHEP CSNS, Guangdong Province, People’s Republic of China L. Ma, S. Wang, T.G. Xu IHEP, Beijing, People’s Republic of China
	In China Spallation Neutron Source(CSNS), the beam charge monitors along the ring to the target beam transport line(RTBT) and the ring to the dump beam transport line(RDBT), are consisted of an ICT and three FCTs manufactured by Bergoz. The electronics includes a set of NI PXIe-5160 oscilloscope digitizer, and a Beam Charge Monitor(BCM) from Bergoz as supplementary. The beam charge monitors provide the following information: a) the quantity of protons bombarded the tungsten target; b) the efficiency of particle transportation; c) a T0 signal to the detectors and spectrometers of the white neutron source. With the calibration with an octopus 50Ω terminator in lab and an onboard 16-turn calibrating coils at the local control room, corrections for the introducing the 16-turn calibrating coils and the long cable were made. An accuracy of ±2% for the beam charge measurement during the machine operation has been achieved with the ICT/FCTs and a PXIe-5160 oscilloscope digitizer.
	Poster MOPC04 [3.082 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC04
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPC06	Comparative Measurement and Characterisation of Three Cryogenic Current Comparators Based on Low-Temperature Superconductors	cryogenics, pick-up, antiproton, electronics	126
	V. Tympel, T. Stöhlker HIJ, Jena, Germany H. De Gersem, N. Marsic, W.F.O. Müller TEMF, TU Darmstadt, Darmstadt, Germany M.F. Fernandes, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom M.F. Fernandes, J. Tan CERN, Geneva, Switzerland M.F. Fernandes, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom J. Golm, R. Neubert, F. Schmidl, P. Seidel FSU Jena, Jena, Germany D.M. Haider, F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker GSI, Darmstadt, Germany R. Neubert Thuringia Observatory Tautenburg, Tautenburg, Germany M. Schmelz, R. Stolz IPHT, Jena, Germany T. Stöhlker IOQ, Jena, Germany V. Zakosarenko Supracon AG, Jena, Germany
	Funding: Supported by the BMBF, project numbers 05P15SJRBA and 05P18SJRB1. A Cryogenic Current Comparator (CCC) is a non-destructive, metrological-traceable charged particle beam intensity measurement system for the nano-ampere range. Using superconducting shielding and coils, low temperature Superconducting Quantum Interference Devices (SQUIDs) and highly permeable flux-concentrators, the CCC can operate in the frequency range from DC to several kHz or hundreds of kHz depending on the requirement of the application. Also, the white noise level can be optimized down to 2 pA/sqrt(Hz) at 2.16 K. This work compares three different Pb- and Nb-based CCC-sensors developed at the Institute of Solid State Physics and Leibniz Institute of Photonic Technology at Jena, Germany: CERN-Nb-CCC, optimized for applica-tion at CERN Antiproton Decelerator (AD) in 2015 with a free inner diameter of 185 mm; GSI-Pb-CCC, designed for GSI-Darmstadt with a free inner diameter of 145 mm, 1996 completed, 2014 upgraded; GSI-Nb-CCC-XD, de-signed for the GSI/FAIR-project with a free inner diame-ter of 250 mm, 2017 completed. The results of noise, small-signal, slew-rate, and drift measurements done 2015 and 2018 in the Cryo-Detector Lab at the University of Jena are presented here.
	Poster MOPC06 [2.150 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC06
About •	paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPC08	Beam Intensity Monitoring with nA Resolution - the Cryogenic Current Comparator (CCC)	cryogenics, antiproton, shielding, storage-ring	130
	D.M. Haider, P. Forck, F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker GSI, Darmstadt, Germany H. De Gersem, N. Marsic TEMF, TU Darmstadt, Darmstadt, Germany M.F. Fernandes, J. Tan CERN, Geneva, Switzerland J. Golm, F. Schmidl, P. Seidel FSU Jena, Jena, Germany J. Golm, T. Stöhlker, V. Tympel HIJ, Jena, Germany M. Schmelz, R. Stolz, V. Zakosarenko IPHT, Jena, Germany T. Stöhlker IOQ, Jena, Germany V. Zakosarenko Supracon AG, Jena, Germany
	Funding: Work supported by AVA - Accelerators Validating Antimatter the EU H2020 Marie-Curie Action No. 721559 and by the BMBF under contract No. 05P15SJRBA. The storage of low current beams as well as the long extraction times from the synchrotrons at FAIR require non-destructive beam intensity monitoring with a current resolution of nanoampere. To fulfill this requirement, the concept of the Cryogenic Current Comparator (CCC), based on the low temperature SQUID, is used to obtain an extremely sensitive beam current transformer. During the last years, CCCs have been installed to do measurements of the spill structure in the extraction line of GSI SIS18 and for current monitoring in the CERN Antiproton Decelerator. From these experiences lessons can be learned to facilitate further developments. The goal of the ongoing research is to improve the robustness of the CCC towards external influences, such as vibrations, stray fields and He-pressure variations, as well as to develop a cost-efficient concept for the superconducting shield and the cryostat.
	Poster MOPC08 [1.441 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC08
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPC14	The Design of Dose Parameter Acquisition and Control System for a Pencil Beam Scanning System in HUST-PTF	controls, monitoring, software, EPICS	143
	Y.Y. Hu, H.D. Guo, H. Lei, X.Y. Li, Y.J. Lin, P. Tan, Y.C. Yu HUST, Wuhan, People’s Republic of China
	Pencil beam scanning (PBS) technology is a flexible and accurate dose delivery technology in proton therapy, which can deliver beams adapting to irregularly shaped tumors, while it requires precise diagnostic and real-time control of the beam dose and position. In this paper，a dose parameter acquisition and control system for the pencil beam scanning system based on the EPICS and LabVIEW is designed for HUST-PTF. The EPICS environment is built to realize the data exchange function between the front-end devices and control system. A channel access server（CAS）is designed to convert treatment parameters into the process variables (PVs) and expose them to the network for data sharing. Under current experimental conditions, the simulated beam current is generated according to the dose parameters in the treatment plan file. The current are processed by a digital electrometer and transmitted to the EPICS database in real time. Then the control system user interface based on LabVIEW is realized for displaying and parameter analysis.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC14
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPC18	Development of an Expert System for the High Intensity Neutrino Beam Facility at J-PARC	kicker, operation, septum, status	154
	K. Nakayoshi, Y. Fujii, T. Nakadaira, K. Sakashita KEK, Ibaraki, Japan
	A high intensity neutrino beam is utilized by a long-baseline neutrino oscillation experiment at J-PARC. To generate a high intensity neutrino beam, a high intensity proton beam is extracted from a 30GeV Main Ring Synchrotron (MR) to the neutrino primary beamline. In the beamline, one mistaken shot can potentially do serious damage to beamline equipment. To avoid such a consequence, many beamline equipment interlocks to stop the beam operation are implemented. Once an interlock is activated, prompt and proper error handling is necessary. We are developing an expert system for prompt and efficient understanding of the status to quickly resume the beam operation. An inference engine is one key component in the expert system. We are developing a Machine-Learning(ML) based inference engine for our expert system. ML is one of the most active research fields in computing, we adopt the technology from it. We report the progress of development of the expert system especially ML based inference engine.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC18
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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TUPA02	A Micromegas Based Neutron Detector for the ESS Beam Loss Monitoring	neutron, detector, photon, simulation	211
	L. Segui, H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, T. Bey, M. Combet, D. Desforge, F. Gougnaud, T.J. Joannem, M. Kebbiri, C. Lahonde-Hamdoun, P. Le Bourlout, Ph. Legou, O. Maillard, J. Marroncle, V. Nadot, T. Papaevangelou, G. Tsiledakis CEA-IRFU, Gif-sur-Yvette, France I. Dolenc Kittelmann, T.J. Shea ESS, Lund, Sweden Y. Mariette CEA-DRF-IRFU, France
	Beam loss monitors are of high importance in high-intensity hadron facilities where any energy loss can produce damage or/and activation of materials. A new type of neutron BLM have been developed for hadron accelerators aiming to cover the low energy part. In this region typical BLMs based on charged particle detection are not appropriate because the expected particle fields will be dominated by neutrons and photons. Moreover, the photon background due to the RF cavities can produce false beam loss signals. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and insensitive to photons (X and gamma). In addition, the detectors will be insensitive to thermal neutrons, since part of them will not be directly correlated to beam loss location. The appropriate configuration of the Micromegas operating conditions will allow excellent timing, intrinsic photon background suppression and individual neutron counting, extending thus the dynamic range to very low particle fluxes. The concept of the detectors and the first results from tests in several facilities will be presented. Moreover, their use in the nBLM ESS system will be also discussed
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA02
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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TUPA09	The Monte Carlo Simulation for the Radiation Protection in a Nozzle of HUST-PTF	neutron, radiation, photon, shielding	232
	Y.C. Yu, H.D. Guo, Y.Y. Hu, X.Y. Li, Y.J. Lin, P. Tan, L.G. Zhang HUST, Wuhan, People’s Republic of China
	Nozzle is the core component in proton therapy machine, which is closest to the patient and is necessary to consider the radiation impacts on patients and machine. The ionization chamber and the range shifter in active scanning nozzle are the main devices in the beam path that affect the proton beam and produce secondary particles during the collision, causing damage to the patients and machine. In this paper, the spatial distribution of energy deposited in all regions, the distribution of the secondary particles of 70-250MeV proton beam in the nozzle in Huazhong University of Science and Technology Proton Therapy Facility(HUST-PTF) are studied with Monte Carlo software FLUKA in order to provide reference for radiation shielding design. Six types of materials commonly used today as range shifters are analyzed in terms of the influence on radiation, so that the most suitable material will be selected.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA09
About •	paper received ※ 04 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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TUPB01	The Installation and Commissioning of the AWAKE Stripline BPM	electron, electronics, MMI, TRIUMF	253
	S. Liu, P.E. Dirksen, V.A. Verzilov TRIUMF, Vancouver, Canada S.J. Gessner, F. Guillot-Vignot, D. Medina, L. Søby CERN, Geneva, Switzerland
	Funding: # TRIUMF contribution was supported by NSERC and CNRC AWAKE (The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN) stripline BPMs are required to measure the position of the single electron bunch to a position resolution of less than 10 µm rms for electron charge of 100 pC to 1 nC. This paper describes the design, installation and commissioning of a such BPM system developed by TRIUMF (Canada). Total 12 BPMs and electronics had been installed on AWAKE beam lines and started commissioning since Fall of 2017. The calibration and measurement performance are also reviewed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB01
About •	paper received ※ 04 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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TUPB10	Design and Simulation of Stripline BPM for HUST Proton Therapy Facility	coupling, impedance, dipole, electron	281
	J.Q. Li, Q.S. Chen, K. Fan, K. Tang, P. Tian HUST, Wuhan, People’s Republic of China
	Proton beams used in Huazhong University of Science and Technology Proton Therapy Facility（HUST-PTF）have extreme low currents of the order of nanoampere，which is a great challenge to beam diagnostics due to low signal level. Conventional destructive beam diagnostic devices will affect the quality of the beam and cannot work online during the patient treatment, so a non-destructive stripline beam position monitor (BPM) is designed. This study will introduce some analysis and simulation results of the stripline BPM, such as the coupling between the electrodes, impedance matching, signal response, etc. We also discussed how to increase the output signal by geometry optimization.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB10
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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TUPC10	The Design of Scanning Control System for Proton Therapy Facility at CIAE	controls, feedback, cyclotron, interface	319
	L.C. Cao, T. Ge, F.P. Guan, S.G. Hou, X.T. Lu, Y. Wang, L.P. Wen CIAE, Beijing, People’s Republic of China
	A new proton therapy facility is being construted at CIAE. As a part of whole control system, the scanning control system is designed to scan the beam for the access of required tumor therapy field. The origin data plan comes from treatment control system. Two set of dipole magnet is driven for changing the beam path. Meanwhile, interfaces between scanning system and other systems is built for beam control and safe considering. In order to acquire high precise feedback control, the beam position and dose monitor ionization chambers will be constructed in the nozzle. Once accident occurs, the scanning system should be able to response instantly to cut off beam and inform safe interlock system simultaneously. The response time of scanning system is at tens of microsecond level, so the scanning controller, feedback controller and the monitor electronics is built in fast mode. Detailed description will be presented in this paper.
	Poster TUPC10 [0.794 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC10
About •	paper received ※ 30 August 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
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WEOC04	Space Charge Effects Studies for the ESS Cold Linac Beam Profiler	space-charge, electron, simulation, HOM	371
	F. Belloni, P. Abbon, F. Benedetti, G. Coulloux, F. Gougnaud, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, J.-Ph. Mols, V. Nadot, L. Scola CEA-DRF-IRFU, France C.A. Thomas ESS, Lund, Sweden
	Five Ionization Profile Monitors are being built by CEA in the framework of the in-kind contribution agreement signed with ESS. The IPMs will be installed in the Cold Linac where the proton energy range they need to cover extends from 90 MeV to 2 GeV. The ESS fields intensity of 1.10⁺⁰⁹ protons/bunch delivered at a frequency of 352 or 704 MHz, with a duty cycle of 4%, may strongly affect the trajectories of the ionized molecules and electrons created by the passage of the beam through the residual gas. In order to quantify and to develop a correction algorithm for these space charge effects, a code was initiated at ESS and completed at CEA Saclay with the possibility to include real case electric fields calculated with Comsol Multiphysics. A general overview of the code and its preliminary results are presented here.
	Slides WEOC04 [5.186 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC04
About •	paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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WEPB16	Development of a Beam-Gas Curtain Profile Monitor for the High Luminosity Upgrade of the LHC	electron, simulation, vacuum, photon	472
	R. Veness, M. Ady, N. Chritin, J. Glutting, O.R. Jones, R. Kersevan, T. Marriott-Dodington, S. Mazzoni, A. Rossi, G. Schneider CERN, Meyrin, Switzerland P. Forck, S. Udrea GSI, Darmstadt, Germany A. Salehilashkajani The University of Liverpool, Liverpool, United Kingdom P. Smakulski WRUT, Wroclaw, Poland C.P. Welsch, H.D. Zhang Cockcroft Institute, Warrington, Cheshire, United Kingdom
	High luminosity upgrades to the LHC at CERN and future energy frontier machines will require a new generation of minimally invasive profile measurement instruments. Production of a dense, focussed gas target allows beam-gas fluorescence to be exploited as an observable, giving an instrument suitable for installation even in regions of high magnetic field. This paper describes the development of a device based on these principles that would be suitable for operation in the LHC. It focusses on mechanisms for the production of a homogeneous gas curtain, the selection of an appropriate working gas and the optical fluorescence detection system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB16
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEPC08	Optical System of Beam Induced Fluorescence Monitor Toward MW Beam Power at the J-PARC Neutrino Beamline	photon, operation, simulation, radiation	505
	S.V. Cao, M.L. Friend, K. Sakashita KEK, Tsukuba, Japan M. Hartz Kavli IPMU, Kashiwa, Japan A. Nakamura Okayama University, Okayama, Japan
	A Beam Induced Fluorescence (BIF) monitor is being developed as an essential part of the monitor update toward MW beam power operation at the J-PARC neutrino beamline. By measuring the fluorescence light from proton-gas interactions, the BIF monitor will be used as a continuous and non-destructive diagnostic tool for monitoring the proton beam profile spill-by-spill, with position and width precision on the order of 200 µm. The main challenge lies in collecting a sufficient amount of fluorescence light for the beam profile reconstruction while controlling the beam-induced noise with the current beamline configuration. A study is presented with a particular focus on the optical system under development, which allows us to transport fluorescence light away from the high radiation environment near the proton beamline and detect the optical signal with a Multi-Pixel Photon-Counter-based fast readout.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC08
About •	paper received ※ 06 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
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WEPC09	Design and Test Results of a Double-Slit Emittance Meter at XiPAF	emittance, rfq, linac, space-charge	509
	M.W. Wang, X. Guan, W.-H. Huang, X.W. Wang, Q.Z. Xing, S.X. Zheng TUB, Beijing, People’s Republic of China M.T. Qiu, D. Wang, Z.M. Wang, C.Y. Wei NINT, Shannxi, People’s Republic of China
	Xi’an Proton Application Facility (XiPAF) is composed of a linac injector, a 230-MeV synchrotron and a high energy transport line. To study the beam dynamics along beamline, a double-slit emittance meter is used to measure beam phase space in the linac. To have knowledge of phase space upstream of the emittance meter, an inverse transport method is proposed in the presence of space charge. The design and preliminary test results of the emittance meter are shown in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC09
About •	paper received ※ 02 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEPC16	Design and Radiation Simulation of the Scintillating Screen Detector for Proton Therapy Facility	radiation, photon, simulation, instrumentation	516
	P. Tian, Q.S. Chen, K. Fan, J.Q. Li, K. Tang HUST, Wuhan, People’s Republic of China
	A proton therapy facility based on a superconducting cyclotron is under construction in Huazhong University of Science and Technology (HUST). In order to achieve precise treatment or dose distribution, the beam current would vary from 0.4 nA to 500 nA, in which case conventional non-intercepting instruments would fail due to their low sensitivity. So we propose to use a retractable scintillating screen to measure beam position and beam profile. In this paper, a comprehensive description of our new designed screen monitor is presented, including the choice of material of the screen, optical calibration and simulation of radiation protection. According to the off-line test, the resolution of the screen monitor can reach 0.13 mm/pixel.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC16
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEPC19	Selection of Wires for the New Generation of Fast Wire Scanners at CERN	acceleration, synchrotron, brightness, ECR	523
	A. Mariet, R. Veness CERN, Meyrin, Switzerland
	A new generation of fast wire scanners is being produced as part of the LHC Injector Upgrade (LIU) project at CERN. The LIU beam parameters imply that these wire scanners will need to operate with significantly brighter beams. This requires wires scanner systems with micron level accuracy and wires with a considerably increased tolerance to beam damage. This paper presents the method of selection of such wires in terms of material choice and geometry. It also reports on studies with novel materials with a potential to further extend the reach of wire scanners for high brightness beams.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC19
About •	paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOOB04

Upgrade of the Machine Protection System Toward 1.3 MW Operation of the J-PARC Neutrino Beamline

target, operation, FPGA, electronics

18

K. Sakashita, M.L. Friend, K. Nakayoshi
KEK, Ibaraki, Japan
Y. Koshio, S. Yamasu
Okayama University, Faculty of Science, Okayama City, Japan

The machine protection system (MPS) is one of the essential components to realize safe operation of the J-PARC neutrino beamline, where a high intensity neutrino beam for the T2K long baseline neutrino oscillation experiment is generated by striking 30GeV protons on a graphite target. The proton beam is extracted from the J-PARC main ring proton synchrotron (MR) into the primary beamline. The beamline is currently operated with 485kW MR beam power. The MR beam power is planned to be upgraded to 1.3+ MW. The neutrino production target could be damaged if the high intensity beam hits off-centered on the target, due to non-uniform thermal stress. Therefore, in order to protect the target, it is important to immediately stop the beam when the beam orbit is shifted. A new FPGA-based interlock module, with which the beam profile is calculated in real time, was recently developed and commissioned. This module reads out signals from a titanium-strip-based secondary emission profile monitor (SSEM) which is placed in the primary beamline. An overview of the upgrade plan of the MPS system and the results of an initial evaluation test of the new interlock module will be discussed.

Slides MOOB04 [8.367 MB]

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paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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MOPA01

Status Overview of the HESR Beam Instrumentation

pick-up, impedance, instrumentation, antiproton

26

C. Böhme, A.J. Halama, V. Kamerdzhiev, F. Klehr, B. Klimczok, M. Maubach, S. Merzliakov, D. Prasuhn, R. Tölle
FZJ, Jülich, Germany

The High Energy Storage Ring (HESR), within the Facility for Antiproton and Ion Research (FAIR), will provide proton and anti-proton beams for PANDA (Proton Antiproton Annihilation at Darmstadt) and heavy ion beams for SPARC (Stored Particles Atomic Physics Research Collaboration). With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM being in production, other BI instruments like Viewer, Scraper, or Ionization Beam Profile Monitor are in the mechanical design phase. An overview of the status is presented.

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paper received ※ 12 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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MOPA07

Beam Diagnostics and Instrumentation for Proton Irradiation Facility at INR RAS Linac

electron, diagnostics, radiation, linac

40

S.A. Gavrilov, A.A. Melnikov, A.I. Titov
RAS/INR, Moscow, Russia

The new proton irradiation facility to study radiation effects in electronics and other materials has been built in INR RAS linac. The range of the specified intensity from 10⁷ to 10¹² protons per beam pulse is covered with three beam diagnostic instruments: current transformer, phosphor screen and multianode gas counter. The peculiarities of the joint use of the three instruments are described. The experimental results of beam parameters observations and adjustments are presented.

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MOPA12

The Design and Use of Faraday Cage in Linac Temporary Line of CSNS

experiment, radiation, linac, DTL

48

M. Meng
DNSC, Dongguan, People’s Republic of China
F. Li, P. Li, A.X. Wang, T.G. Xu
IHEP, Beijing, People’s Republic of China
J.L. Sun
IHEP CSNS, Guangdong Province, People’s Republic of China

In the end of linac temporary line in csns, we need a faraday cage to absorb the beam. in the beam experiment it will be mounted and used twice. according to the beam energy and current of csns, we choose water-cooled pipe structure with tilted panel after simulation. the main principle of the faraday cage design is to simplify the structure and reduce the radiation activation of it, to do this, we also do the simulation of radiation. to make sure the faraday cage is safe in beam experiment, we alos plug in a pt100 Platinum resistance to monitor the temperature. after faraday cage is built and mounted on the line, it works well and sustain the beam bombardment.

Poster MOPA12 [0.471 MB]

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paper received ※ 03 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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MOPB07

Beam Parameter Measurements for the J-PARC High-Intensity Neutrino Extraction Beamline

target, radiation, monitoring, extraction

85

M.L. Friend
KEK, Ibaraki, Japan

Proton beam monitoring is absolutely essential for the J-PARC neutrino extraction beamline, where neutrinos are produced by the collision of 30 GeV protons from the J-PARC MR accelerator with a long carbon target. Continuous beam monitoring is crucial for the stable and safe operation of the extraction line high intensity proton beam, since even a single misfired beam spill can cause serious damage to beamline equipment at 2.5x10¹⁴ and higher protons-per-pulse. A precise understanding of the proton beam intensity and profile on the neutrino production target is also necessary for predicting the neutrino beam flux with high precision. Details of the suite of monitors used to continuously and precisely monitor the J-PARC neutrino extraction line proton beam will be shown, including recent running experiences, challenges, and future upgrade plans.

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MOPC04

Beam Charge Measurement and System Calibration in CSNS

target, extraction, electronics, operation

122

W.L. Huang, F. Li
IHEP CSNS, Guangdong Province, People’s Republic of China
L. Ma, S. Wang, T.G. Xu
IHEP, Beijing, People’s Republic of China

In China Spallation Neutron Source(CSNS), the beam charge monitors along the ring to the target beam transport line(RTBT) and the ring to the dump beam transport line(RDBT), are consisted of an ICT and three FCTs manufactured by Bergoz. The electronics includes a set of NI PXIe-5160 oscilloscope digitizer, and a Beam Charge Monitor(BCM) from Bergoz as supplementary. The beam charge monitors provide the following information: a) the quantity of protons bombarded the tungsten target; b) the efficiency of particle transportation; c) a T0 signal to the detectors and spectrometers of the white neutron source. With the calibration with an octopus 50Ω terminator in lab and an onboard 16-turn calibrating coils at the local control room, corrections for the introducing the 16-turn calibrating coils and the long cable were made. An accuracy of ±2% for the beam charge measurement during the machine operation has been achieved with the ICT/FCTs and a PXIe-5160 oscilloscope digitizer.

Poster MOPC04 [3.082 MB]

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MOPC06

Comparative Measurement and Characterisation of Three Cryogenic Current Comparators Based on Low-Temperature Superconductors

cryogenics, pick-up, antiproton, electronics

126

V. Tympel, T. Stöhlker
HIJ, Jena, Germany
H. De Gersem, N. Marsic, W.F.O. Müller
TEMF, TU Darmstadt, Darmstadt, Germany
M.F. Fernandes, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
M.F. Fernandes, J. Tan
CERN, Geneva, Switzerland
M.F. Fernandes, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
J. Golm, R. Neubert, F. Schmidl, P. Seidel
FSU Jena, Jena, Germany
D.M. Haider, F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker
GSI, Darmstadt, Germany
R. Neubert
Thuringia Observatory Tautenburg, Tautenburg, Germany
M. Schmelz, R. Stolz
IPHT, Jena, Germany
T. Stöhlker
IOQ, Jena, Germany
V. Zakosarenko
Supracon AG, Jena, Germany

Funding: Supported by the BMBF, project numbers 05P15SJRBA and 05P18SJRB1.
A Cryogenic Current Comparator (CCC) is a non-destructive, metrological-traceable charged particle beam intensity measurement system for the nano-ampere range. Using superconducting shielding and coils, low temperature Superconducting Quantum Interference Devices (SQUIDs) and highly permeable flux-concentrators, the CCC can operate in the frequency range from DC to several kHz or hundreds of kHz depending on the requirement of the application. Also, the white noise level can be optimized down to 2 pA/sqrt(Hz) at 2.16 K. This work compares three different Pb- and Nb-based CCC-sensors developed at the Institute of Solid State Physics and Leibniz Institute of Photonic Technology at Jena, Germany: CERN-Nb-CCC, optimized for applica-tion at CERN Antiproton Decelerator (AD) in 2015 with a free inner diameter of 185 mm; GSI-Pb-CCC, designed for GSI-Darmstadt with a free inner diameter of 145 mm, 1996 completed, 2014 upgraded; GSI-Nb-CCC-XD, de-signed for the GSI/FAIR-project with a free inner diame-ter of 250 mm, 2017 completed. The results of noise, small-signal, slew-rate, and drift measurements done 2015 and 2018 in the Cryo-Detector Lab at the University of Jena are presented here.

Poster MOPC06 [2.150 MB]

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MOPC08

Beam Intensity Monitoring with nA Resolution - the Cryogenic Current Comparator (CCC)

cryogenics, antiproton, shielding, storage-ring

130

D.M. Haider, P. Forck, F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker
GSI, Darmstadt, Germany
H. De Gersem, N. Marsic
TEMF, TU Darmstadt, Darmstadt, Germany
M.F. Fernandes, J. Tan
CERN, Geneva, Switzerland
J. Golm, F. Schmidl, P. Seidel
FSU Jena, Jena, Germany
J. Golm, T. Stöhlker, V. Tympel
HIJ, Jena, Germany
M. Schmelz, R. Stolz, V. Zakosarenko
IPHT, Jena, Germany
T. Stöhlker
IOQ, Jena, Germany
V. Zakosarenko
Supracon AG, Jena, Germany

Funding: Work supported by AVA - Accelerators Validating Antimatter the EU H2020 Marie-Curie Action No. 721559 and by the BMBF under contract No. 05P15SJRBA.
The storage of low current beams as well as the long extraction times from the synchrotrons at FAIR require non-destructive beam intensity monitoring with a current resolution of nanoampere. To fulfill this requirement, the concept of the Cryogenic Current Comparator (CCC), based on the low temperature SQUID, is used to obtain an extremely sensitive beam current transformer. During the last years, CCCs have been installed to do measurements of the spill structure in the extraction line of GSI SIS18 and for current monitoring in the CERN Antiproton Decelerator. From these experiences lessons can be learned to facilitate further developments. The goal of the ongoing research is to improve the robustness of the CCC towards external influences, such as vibrations, stray fields and He-pressure variations, as well as to develop a cost-efficient concept for the superconducting shield and the cryostat.

Poster MOPC08 [1.441 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC08

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MOPC14

The Design of Dose Parameter Acquisition and Control System for a Pencil Beam Scanning System in HUST-PTF

controls, monitoring, software, EPICS

143

Y.Y. Hu, H.D. Guo, H. Lei, X.Y. Li, Y.J. Lin, P. Tan, Y.C. Yu
HUST, Wuhan, People’s Republic of China

Pencil beam scanning (PBS) technology is a flexible and accurate dose delivery technology in proton therapy, which can deliver beams adapting to irregularly shaped tumors, while it requires precise diagnostic and real-time control of the beam dose and position. In this paper，a dose parameter acquisition and control system for the pencil beam scanning system based on the EPICS and LabVIEW is designed for HUST-PTF. The EPICS environment is built to realize the data exchange function between the front-end devices and control system. A channel access server（CAS）is designed to convert treatment parameters into the process variables (PVs) and expose them to the network for data sharing. Under current experimental conditions, the simulated beam current is generated according to the dose parameters in the treatment plan file. The current are processed by a digital electrometer and transmitted to the EPICS database in real time. Then the control system user interface based on LabVIEW is realized for displaying and parameter analysis.

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MOPC18

Development of an Expert System for the High Intensity Neutrino Beam Facility at J-PARC

kicker, operation, septum, status

154

K. Nakayoshi, Y. Fujii, T. Nakadaira, K. Sakashita
KEK, Ibaraki, Japan

A high intensity neutrino beam is utilized by a long-baseline neutrino oscillation experiment at J-PARC. To generate a high intensity neutrino beam, a high intensity proton beam is extracted from a 30GeV Main Ring Synchrotron (MR) to the neutrino primary beamline. In the beamline, one mistaken shot can potentially do serious damage to beamline equipment. To avoid such a consequence, many beamline equipment interlocks to stop the beam operation are implemented. Once an interlock is activated, prompt and proper error handling is necessary. We are developing an expert system for prompt and efficient understanding of the status to quickly resume the beam operation. An inference engine is one key component in the expert system. We are developing a Machine-Learning(ML) based inference engine for our expert system. ML is one of the most active research fields in computing, we adopt the technology from it. We report the progress of development of the expert system especially ML based inference engine.

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TUPA02

A Micromegas Based Neutron Detector for the ESS Beam Loss Monitoring

neutron, detector, photon, simulation

211

L. Segui, H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, T. Bey, M. Combet, D. Desforge, F. Gougnaud, T.J. Joannem, M. Kebbiri, C. Lahonde-Hamdoun, P. Le Bourlout, Ph. Legou, O. Maillard, J. Marroncle, V. Nadot, T. Papaevangelou, G. Tsiledakis
CEA-IRFU, Gif-sur-Yvette, France
I. Dolenc Kittelmann, T.J. Shea
ESS, Lund, Sweden
Y. Mariette
CEA-DRF-IRFU, France

Beam loss monitors are of high importance in high-intensity hadron facilities where any energy loss can produce damage or/and activation of materials. A new type of neutron BLM have been developed for hadron accelerators aiming to cover the low energy part. In this region typical BLMs based on charged particle detection are not appropriate because the expected particle fields will be dominated by neutrons and photons. Moreover, the photon background due to the RF cavities can produce false beam loss signals. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and insensitive to photons (X and gamma). In addition, the detectors will be insensitive to thermal neutrons, since part of them will not be directly correlated to beam loss location. The appropriate configuration of the Micromegas operating conditions will allow excellent timing, intrinsic photon background suppression and individual neutron counting, extending thus the dynamic range to very low particle fluxes. The concept of the detectors and the first results from tests in several facilities will be presented. Moreover, their use in the nBLM ESS system will be also discussed

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paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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TUPA09

The Monte Carlo Simulation for the Radiation Protection in a Nozzle of HUST-PTF

neutron, radiation, photon, shielding

232

Y.C. Yu, H.D. Guo, Y.Y. Hu, X.Y. Li, Y.J. Lin, P. Tan, L.G. Zhang
HUST, Wuhan, People’s Republic of China

Nozzle is the core component in proton therapy machine, which is closest to the patient and is necessary to consider the radiation impacts on patients and machine. The ionization chamber and the range shifter in active scanning nozzle are the main devices in the beam path that affect the proton beam and produce secondary particles during the collision, causing damage to the patients and machine. In this paper, the spatial distribution of energy deposited in all regions, the distribution of the secondary particles of 70-250MeV proton beam in the nozzle in Huazhong University of Science and Technology Proton Therapy Facility(HUST-PTF) are studied with Monte Carlo software FLUKA in order to provide reference for radiation shielding design. Six types of materials commonly used today as range shifters are analyzed in terms of the influence on radiation, so that the most suitable material will be selected.

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TUPB01

The Installation and Commissioning of the AWAKE Stripline BPM

electron, electronics, MMI, TRIUMF

253

S. Liu, P.E. Dirksen, V.A. Verzilov
TRIUMF, Vancouver, Canada
S.J. Gessner, F. Guillot-Vignot, D. Medina, L. Søby
CERN, Geneva, Switzerland

Funding: # TRIUMF contribution was supported by NSERC and CNRC
AWAKE (The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN) stripline BPMs are required to measure the position of the single electron bunch to a position resolution of less than 10 µm rms for electron charge of 100 pC to 1 nC. This paper describes the design, installation and commissioning of a such BPM system developed by TRIUMF (Canada). Total 12 BPMs and electronics had been installed on AWAKE beam lines and started commissioning since Fall of 2017. The calibration and measurement performance are also reviewed.

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paper received ※ 04 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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TUPB10

Design and Simulation of Stripline BPM for HUST Proton Therapy Facility

coupling, impedance, dipole, electron

281

J.Q. Li, Q.S. Chen, K. Fan, K. Tang, P. Tian
HUST, Wuhan, People’s Republic of China

Proton beams used in Huazhong University of Science and Technology Proton Therapy Facility（HUST-PTF）have extreme low currents of the order of nanoampere，which is a great challenge to beam diagnostics due to low signal level. Conventional destructive beam diagnostic devices will affect the quality of the beam and cannot work online during the patient treatment, so a non-destructive stripline beam position monitor (BPM) is designed. This study will introduce some analysis and simulation results of the stripline BPM, such as the coupling between the electrodes, impedance matching, signal response, etc. We also discussed how to increase the output signal by geometry optimization.

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TUPC10

The Design of Scanning Control System for Proton Therapy Facility at CIAE

controls, feedback, cyclotron, interface

319

L.C. Cao, T. Ge, F.P. Guan, S.G. Hou, X.T. Lu, Y. Wang, L.P. Wen
CIAE, Beijing, People’s Republic of China

A new proton therapy facility is being construted at CIAE. As a part of whole control system, the scanning control system is designed to scan the beam for the access of required tumor therapy field. The origin data plan comes from treatment control system. Two set of dipole magnet is driven for changing the beam path. Meanwhile, interfaces between scanning system and other systems is built for beam control and safe considering. In order to acquire high precise feedback control, the beam position and dose monitor ionization chambers will be constructed in the nozzle. Once accident occurs, the scanning system should be able to response instantly to cut off beam and inform safe interlock system simultaneously. The response time of scanning system is at tens of microsecond level, so the scanning controller, feedback controller and the monitor electronics is built in fast mode. Detailed description will be presented in this paper.

Poster TUPC10 [0.794 MB]

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paper received ※ 30 August 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

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WEOC04

Space Charge Effects Studies for the ESS Cold Linac Beam Profiler

space-charge, electron, simulation, HOM

371

F. Belloni, P. Abbon, F. Benedetti, G. Coulloux, F. Gougnaud, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, J.-Ph. Mols, V. Nadot, L. Scola
CEA-DRF-IRFU, France
C.A. Thomas
ESS, Lund, Sweden

Five Ionization Profile Monitors are being built by CEA in the framework of the in-kind contribution agreement signed with ESS. The IPMs will be installed in the Cold Linac where the proton energy range they need to cover extends from 90 MeV to 2 GeV. The ESS fields intensity of 1.10⁺⁰⁹ protons/bunch delivered at a frequency of 352 or 704 MHz, with a duty cycle of 4%, may strongly affect the trajectories of the ionized molecules and electrons created by the passage of the beam through the residual gas. In order to quantify and to develop a correction algorithm for these space charge effects, a code was initiated at ESS and completed at CEA Saclay with the possibility to include real case electric fields calculated with Comsol Multiphysics. A general overview of the code and its preliminary results are presented here.

Slides WEOC04 [5.186 MB]

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paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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WEPB16

Development of a Beam-Gas Curtain Profile Monitor for the High Luminosity Upgrade of the LHC

electron, simulation, vacuum, photon

472

R. Veness, M. Ady, N. Chritin, J. Glutting, O.R. Jones, R. Kersevan, T. Marriott-Dodington, S. Mazzoni, A. Rossi, G. Schneider
CERN, Meyrin, Switzerland
P. Forck, S. Udrea
GSI, Darmstadt, Germany
A. Salehilashkajani
The University of Liverpool, Liverpool, United Kingdom
P. Smakulski
WRUT, Wroclaw, Poland
C.P. Welsch, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom

High luminosity upgrades to the LHC at CERN and future energy frontier machines will require a new generation of minimally invasive profile measurement instruments. Production of a dense, focussed gas target allows beam-gas fluorescence to be exploited as an observable, giving an instrument suitable for installation even in regions of high magnetic field. This paper describes the development of a device based on these principles that would be suitable for operation in the LHC. It focusses on mechanisms for the production of a homogeneous gas curtain, the selection of an appropriate working gas and the optical fluorescence detection system.

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paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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WEPC08

Optical System of Beam Induced Fluorescence Monitor Toward MW Beam Power at the J-PARC Neutrino Beamline

photon, operation, simulation, radiation

505

S.V. Cao, M.L. Friend, K. Sakashita
KEK, Tsukuba, Japan
M. Hartz
Kavli IPMU, Kashiwa, Japan
A. Nakamura
Okayama University, Okayama, Japan

A Beam Induced Fluorescence (BIF) monitor is being developed as an essential part of the monitor update toward MW beam power operation at the J-PARC neutrino beamline. By measuring the fluorescence light from proton-gas interactions, the BIF monitor will be used as a continuous and non-destructive diagnostic tool for monitoring the proton beam profile spill-by-spill, with position and width precision on the order of 200 µm. The main challenge lies in collecting a sufficient amount of fluorescence light for the beam profile reconstruction while controlling the beam-induced noise with the current beamline configuration. A study is presented with a particular focus on the optical system under development, which allows us to transport fluorescence light away from the high radiation environment near the proton beamline and detect the optical signal with a Multi-Pixel Photon-Counter-based fast readout.

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paper received ※ 06 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

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WEPC09

Design and Test Results of a Double-Slit Emittance Meter at XiPAF

emittance, rfq, linac, space-charge

509

M.W. Wang, X. Guan, W.-H. Huang, X.W. Wang, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People’s Republic of China
M.T. Qiu, D. Wang, Z.M. Wang, C.Y. Wei
NINT, Shannxi, People’s Republic of China

Xi’an Proton Application Facility (XiPAF) is composed of a linac injector, a 230-MeV synchrotron and a high energy transport line. To study the beam dynamics along beamline, a double-slit emittance meter is used to measure beam phase space in the linac. To have knowledge of phase space upstream of the emittance meter, an inverse transport method is proposed in the presence of space charge. The design and preliminary test results of the emittance meter are shown in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC09

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paper received ※ 02 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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WEPC16

Design and Radiation Simulation of the Scintillating Screen Detector for Proton Therapy Facility

radiation, photon, simulation, instrumentation

516

P. Tian, Q.S. Chen, K. Fan, J.Q. Li, K. Tang
HUST, Wuhan, People’s Republic of China

A proton therapy facility based on a superconducting cyclotron is under construction in Huazhong University of Science and Technology (HUST). In order to achieve precise treatment or dose distribution, the beam current would vary from 0.4 nA to 500 nA, in which case conventional non-intercepting instruments would fail due to their low sensitivity. So we propose to use a retractable scintillating screen to measure beam position and beam profile. In this paper, a comprehensive description of our new designed screen monitor is presented, including the choice of material of the screen, optical calibration and simulation of radiation protection. According to the off-line test, the resolution of the screen monitor can reach 0.13 mm/pixel.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC16

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paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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WEPC19

Selection of Wires for the New Generation of Fast Wire Scanners at CERN

acceleration, synchrotron, brightness, ECR

523

A. Mariet, R. Veness
CERN, Meyrin, Switzerland

A new generation of fast wire scanners is being produced as part of the LHC Injector Upgrade (LIU) project at CERN. The LIU beam parameters imply that these wire scanners will need to operate with significantly brighter beams. This requires wires scanner systems with micron level accuracy and wires with a considerably increased tolerance to beam damage. This paper presents the method of selection of such wires in terms of material choice and geometry. It also reports on studies with novel materials with a potential to further extend the reach of wire scanners for high brightness beams.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC19

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paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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