IBIC2018 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
MOPA02	Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation	injection, timing, extraction, operation	29
	H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama KEK, Ibaraki, Japan
	The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA02
About •	paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA06	Recent Advances in Beam Monitoring During SEE Testing on ISDE&JINR Heavy Ion Facilities	detector, monitoring, heavy-ion, real-time	36
	P.A. Chubunov ISDE, Moscow, Russia V.S. Anashin United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia A. Issatov JINR/FLNR, Moscow region, Russia S.V. Mitrofanov JINR, Dubna, Moscow Region, Russia
	SEE testing of candidate electronic components for space applications is essential part of a spacecraft radiation hardness assurance process in terms of its operability in the harsh space radiation environment. The unique in Russia SEE test facilities have been created to provide SEE testing. The existing ion beam monitoring system has been presented at IBIC 2017, however, it has a number of shortcomings related to the lack of reliable online ion fluence measurement on the DUT, and inability to measure energies of the high-energy (15-60 MeV/nucleon) long-range (10-2000 µm) ions on the DUT. The paper presents the latest developments and their test results of the ISDE and JINR collaboration in the field of flux online monitoring (including, on the DUT) during tests using scintillation detectors based on flexible optical fibers, and measuring ion energies by the method of total absorption in the volume of scintillation or semiconductor detector. The modernization of the standard beam monitoring procedure during tests is proposed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA06
About •	paper received ※ 06 September 2018 paper accepted ※ 12 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, linac, proton	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, linac, DTL, proton	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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MOPA17	Momentum Compaction Measurement Using Synchrotron Radiation	SRF, electron, photon, experiment	66
	L. Torino, N. Carmignani, A. Franchi ESRF, Grenoble, France
	The momentum compaction factor of a storage ring can be obtained by measuring how the beam energy changes with the RF frequency. Direct measurement of the beam energy can be difficult, long or even not possible with acceptable accuracy and precision in some machines such as ESRF. Since the energy spectrum of the Synchrotron Radiation (SR) depends on the beam energy, it is indeed possible to relate the variation of the beam energy with a variation of the produced SR flux. In this proceeding, we will present how we obtain a measurement of the momentum compaction using this dependence.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA17
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPB07	Beam Parameter Measurements for the J-PARC High-Intensity Neutrino Extraction Beamline	proton, target, 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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MOPC03	Precise Measurement of Small Currents at the MLS	electron, experiment, storage-ring, synchrotron	118
	Y. Petenev, J. Feikes, J. Li, A.N. Matveenko, Y. Tamashevich HZB, Berlin, Germany R. Klein, J. Lubeck, R. Thornagel PTB, Berlin, Germany
	The Physikalisch-Technische Bundesanstalt (PTB), the National Metrology Institute of Germany, utilizes an electron storage ring - the Metrology Light Source (MLS), located in Berlin, as a radiation source standard in the VIS, UV and VUV spectral range. In order to be able to calculate the absolute intensity of the radiation, the electron beam current has to be measured with low uncertainty. In this paper we focus on the measurement of the beam current in a range of several nA to 1 pA (one electron) by means of Si photodiodes, detecting synchrotron radiation from the beam. Electrons are gradually scraped out of the ring and the diode signal is analyzed afterwards. The exact number of stored electrons then can be derived from the signal. The measurement is carried out automatically with an in-house developed software.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC03
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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TUOB03	Demonstration of a Newly Developed Pulse-by-pulse X-Ray Beam Position Monitor in SPring-8	detector, operation, storage-ring, ISOL	182
	H. Aoyagi, Y. Furukawa, S. Takahashi, A. Watanabe JASRI/SPring-8, Hyogo, Japan
	Funding: This work was partly supported by Japan Society for the Promotion of Science through a Grant-in-Aid for Scientific Research (c), No. 20416374 and No. 18K11943. A newly designed pulse-by-pulse X-ray beam position monitor (XBPM), which is photoemission type, has been demonstrated successfully in the SPring-8 synchrotron radiation beamline. Conventional XBPMs work in the direct-current (DC) mode, because it is difficult to measure a beam position in the pulse mode under the sever heat load condition. The key point of the design is aiming at improving heat-resistance property without degradation of high frequency property [1]. This monitor is equipped with microstripline structure for signal transmission line to achieve pulse-by-pulse beam position signal. A photocathode is titanium electrode that is sputtered on a diamond heat sink to achieve high heat resistance. We have manufactured the prototype, and demonstrated feasibility at the SPring-8 bending magnet beamline. As a result, we observed a unipolar single pulse with the pulse length of less than 1 ns FWHM and confirmed that it has pulse-by-pules position sensitivity [2]. Furthermore, this monitor can be also used in the direct-current mode with good stability and good resolution. The operational experience will be also presented. [1] http://accelconf.web.cern.ch/AccelConf/medsi2016/papers/wepe10.pdf [2] http://www.pasj.jp/web_publish/pasj2017/proceedings/PDF/THOM/THOM06.pdf
	Slides TUOB03 [2.380 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOB03
About •	paper received ※ 31 August 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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TUOC04	Development of Beam Position Monitor for the SPring-8 Upgrade	electron, electronics, storage-ring, brilliance	204
	H. Maesaka RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan H. Dewa, T. Fujita, M. Masaki, S. Takano JASRI, Hyogo, Japan
	We are developing a new electron beam position monitor (BPM) system for the low-emittance upgrade of SPring-8. The requirements for the BPM system are: (1) a single-pass resolution of 100 µm rms for a 100 pC bunch and an electric center accuracy of 100 µm rms for the initial beam commissioning to achieve the first turn, (2) a closed-orbit distortion (COD) resolution better than 0.1 µm rms for a 100 mA stored beam and a position stability of less than 5 µm for the ultimate stability of a photon beam axis. We have completed prototypes of a precise button electrode and a BPM block to obtain high-intensity signals and sufficient mechanical accuracy while suppressing high-Q trapped modes leading to impedance and heating issues. The development of readout electronics based on the MTCA.4 standard and the evaluation of radiation-hard coaxial cables have also been conducted. The prototype BPM head was installed in the present SPring-8 storage ring for performance verification with an actual electron beam. We confirmed sufficient signal intensity, electric center accuracy, position stability, etc. by the beam test. The new BPM system is almost ready for the SPring-8 upgrade.
	Slides TUOC04 [2.126 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOC04
About •	paper received ※ 06 September 2018 paper accepted ※ 12 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, proton, 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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TUPA14	Beam Loss Monitoring in the ISIS Synchrotron Main Dipole Magnets	dipole, detector, synchrotron, controls	236
	D.M. Harryman, S.A. Fisher, W.A. Frank, B. Jones, A. Pertica, D.W. Posthuma de Boer, C.C. Wilcox STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Beam loss monitoring at the ISIS Neutron and Muon Source is primarily carried out with the use of gas ionisation chambers filled with argon. These chambers are 3 to 4m long and are positioned around the inside of the synchrotron as well as along the ISIS Linac and Extracted Proton Beamlines (EPBs). To achieve finer spatial resolution a programme has been implemented to install six scintillator Beam Loss Monitors (BLMs), each 300 mm long, inside each of the ten main dipole magnets. Using these scintillator BLMs the accelerator can be fine-tuned during set-up to reduce areas of beam loss that were previously unseen or hard to characterise. As the installation programme comes to an end, this paper will review: the installation of the scintillator BLMs, the electronic hardware and software used to control them, and the initial measurements that have been taken using them.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA14
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEOB02	RadFET Dose Monitor System for SOLEIL	electron, electronics, storage-ring, vacuum	353
	N. Hubert, F. Dohou, M. El Ajjouri, D. Pédeau SOLEIL, Gif-sur-Yvette, France
	Soleil is currently testing new dose monitors based on RadFET transistors. This new detector at SOLEIL will provide a measurement of the dose received by equipment that are damaged by the radiations in the storage ring, and to anticipate their replacement. This monitor should be very compact to be placed in tiny areas, sensitive to all kind of radiation and low cost to install many of them around the ring. A readout electronic module is being developed in-house, and a first prototype has been build and installed on the machine. Description of the system and first results recorded on the machine are presented.
	Slides WEOB02 [4.250 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOB02
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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WEPA12	Differential Evolution Genetic Algorithm for Beam Bunch Temporal Reconstruction	electron, laser, FEL, experiment	392
	D. Wu, T.H. He, C.L. Lao, P. Li, J. Liu, X. Luo, Q. Pan, L.J. Shan, X. Shen, J. Wang, D.X. Xiao, L.G. Yan, P. Zhang, K. Zhou CAEP/IAE, Mianyang, Sichuan, People’s Republic of China Y. Liu CAEP/IFP, Mainyang, Sichuan, People’s Republic of China
	Funding: Work supported by China National Natural Science Foundation of China with grant (11475159, 11505173, 11505174, 11575264, 11605190 and 11105019) Coherent radiation, such as coherent transition radiation, coherent diffraction radiation, coherent synchrotron radiation, etc, can be used to measure the longitudinal distribution of the electron beam bunch of any length, as long as the coherent radiation spectrum can be measured. In many cases, the Kramers-Krönig relationship is used to reconstruct the temporal distribution of the beam from the coherent radiation spectrum. However, the extrapolation of the low frequency will introduce the uncertainty of the reconstruction. In this paper, an algorithm of differential evolution (DE) for temporal reconstruction is discussed. The DE reconstruction works well for the complex and ultrashort distribution. It will be an effectIve tool to accurately measure the femtosecond bunch temporal structure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA12
About •	paper received ※ 07 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
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WEPA16	Micro-Bunching Instability Monitor for X-ray Free Electron Laser	electron, bunching, laser, linac	404
	C. Kim, H.-S. Kang, G. Kim, I.S. Ko PAL, Pohang, Kyungbuk, Republic of Korea J.H. Ko POSTECH, Pohang, Kyungbuk, Republic of Korea
	A direct method was developed to measure the micro-bunching instability in the X-ray Free Electron Laser (XFEL). The micro-bunching instability comes from the interaction between the electron beam and the coherent synchrotron radiation (CSR), and the FEL intensity can be affected significantly by the micro-bunching instability. However, no effective method had been introduced to monitor the micro-bunching instability, so that we installed a CCD camera to measure the micro-bunching instability after the bunch compressor. The CCD camera showed the micro-bunching instability successfully, and more interesting features of the micro-bunching instability were revealed from it.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA16
About •	paper received ※ 09 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEPB01	Photon Beam Imager at SOLEIL	undulator, vacuum, operation, photon	425
	M. Labat, J. Da Silva, N. Hubert, F. Lepage SOLEIL, Gif-sur-Yvette, France
	In one of the long straight sections of SOLEIL is installed a pair of canted in-vacuum undulators for the ANATOMIX and NANOSCOPIUM beamlines. Since the upstream undulator radiation can potentially damage the downstream undulator magnets, an accurate survey of the respective alignment of the two devices is mandatory. An XBPM has been initially installed for this purpose in the beamline frontend. For redundancy and further analysis, an X-ray imager was then designed and added just downstream the XBPM. It is made of a diamond plate that can be inserted into the upstream beamline frontend at low current. Fluorescence of the Nitrogen impurities in the diamond is imaged on a CCD to check that the upstream radiation is not hitting the downstream insertion device. We present the commissioning of this new device together with its first results in operation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB01
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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WEPB11	Spatial Resolution Improvement of OTR Monitors by Off-axis Light Collection	electron, target, diagnostics, photon	451
	A. Potylitsyn, A.I. Novokshonov, L.G. Sukhikh TPU, Tomsk, Russia G. Kube, A.I. Novokshonov DESY, Hamburg, Germany
	Funding: The work was partly supported by the program "Nauka" of the Russian Ministry of Education and Science, grant #3.1903.2017 The spatial resolution of an OTR monitor for electron beam profile diagnostics is determined by the resolution of the optical system and by the Point Spread Function (PSF) representing the single electron image. In the image plane, the PSF has a typical lobe-shape distribution with an inter-peak distance depending on wavelength and lens aperture ratio []. For a beam with a transverse rms size smaller than the distance, the reconstruction of the beam profile has several difficulties [, *]. We propose to reduce the PSF contribution and to improve the spatial resolution of an OTR monitor simply by rotating the lens optical axis with respect to the specular reflection direction. If the difference between the rotational angle and the lens aperture is much larger than the inverse Lorentz factor, the PSF has a Gaussian-like distribution which matches practically with the Airy distribution. Thus the resolution depends on wavelength and lens aperture. In principle, for lens apertures in the order of 0.1 rad such an approach should allow to measure beam sizes comparable to the wavelength of observation, using a simple deconvolution procedure for the measured image and the PSF. M. Castellano, V.Verzilov, Phys. Rev. ST-AB, 1 (1998). K.Kruchinin, S.T.Boogert, P.Karataev et al., Proc. IBIC 2013 (2013). * L.G. Sukhikh, A.P. Potylitsyn, G. Kube, Phys. Rev. AB 20 (2017).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB11
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEPB14	Recent Results on Non-invasive Beam Size Measurement Methods Based on Polarization Currents	target, experiment, polarization, photon	464
	S. Mazzoni, M. Bergamaschi, O.R. Jones, R. Kieffer, T. Lefèvre, F. Roncarolo CERN, Geneva, Switzerland A. Aryshev, N. Terunuma KEK, Ibaraki, Japan M.G. Billing, J.V. Conway, M.J. Forster, Y.L.P. Fuentes, J.P. Shanks, S. Wang, L.Y. Ying Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA V.V. Bleko, A.S. Konkov, A. Potylitsyn TPU, Tomsk, Russia L. Bobb DLS, Oxfordshire, United Kingdom P. Karataev, K. Lekomtsev JAI, Egham, Surrey, United Kingdom P. Karataev Royal Holloway, University of London, Surrey, United Kingdom
	We present recent results on non-invasive beam profile measurement techniques based on Diffraction Radiation (DR) and Cherenkov Diffraction Radiation (ChDR). Both methods exploit the analysis of broadband electromagnetic radiation resulting from polarization currents produced in, or at the boundary of, a medium in close proximity of a charged particle beam. To increase the resolution of DR, measurements were performed in the UV range at a wavelength of 250 nm. With such configurations, sensitivity to the beam size of a 1.2 GeV electron beam below 10 um was observed at the Accelerator Test Facility (ATF) at KEK, Japan. In the case of the ChDR, a proof of principle study was carried out at the Cornell Electron Storage Ring (CESR) where beam profiles were measured in 2017 on a 5.3 GeV positron beam. At the time of writing an experiment to measure the resolution limit of ChDR has been launched at ATF where smaller beam sizes are available. We will present experimental results and discuss the application of such techniques for future accelerators.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB14
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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WEPC04	Setup for Beam Profile Measurements using Optical Transition Radiation	target, electron, linac, diagnostics	494
	J. Pforr, M. Arnold, T. Bahlo, L.E. Jürgensen, N. Pietralla, A. Rost TU Darmstadt, Darmstadt, Germany F. Hug KPH, Mainz, Germany
	Funding: Work supported by DFG through GRK 2128. The S-DALINAC is a thrice-recirculating, superconducting linear electron accelerator at TU Darmstadt. It can provide beams of electrons with energies up to 130 MeV and currents of 20 µA. The accelerator performance was improved by an extension of the beam diagnostics, as this increases the reproducibility of the machine settings. Therefore, the installation of several beam profile measurement stations is planned, which should be operational down to a beam current of 100 nA, as this current is used for beam tuning. Combining these devices with a quadrupole scan also allows for emittance measurements. The beam profile measurements shall be done based on optical transition radiation (OTR), resulting from the penetration of relativistic electrons from vacuum into a metal target. The radiation can be detected using standard cameras that provide information on the two-dimensional particle distribution. This contribution will address the layout of the measurement stations and a first test measurement will be presented.
	Poster WEPC04 [1.189 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC04
About •	paper received ※ 03 September 2018 paper accepted ※ 12 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	proton, photon, operation, simulation	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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WEPC16	Design and Radiation Simulation of the Scintillating Screen Detector for Proton Therapy Facility	proton, 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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WEPC17	X-ray Pinhole Camera in the Diagnostics Beamlime BL7B at PLS-II	photon, electron, diagnostics, beam-diagnostic	519
	J.J. Ko, J.Y. Huang, D. Kim, D.W. Lee, B.H. Oh, S. Shin, J. U. Yu PAL, Pohang, Kyungbuk, Republic of Korea M. Yoon POSTECH, Pohang, Kyungbuk, Republic of Korea
	The beam diagnostics beamline BL7B using synchrotron radiation with 8.6 keV critical photon energy from bending magnet has been used to measure the electron-beam size and photon-beam profile on real-time basis. After the completion of the PLS-II, the Compound Refractive Lens (CRL) system was implemented in the optical hutch at BL7B to measure the electron-beam size from X-ray imaging. But we could not have a good image due to short focal length caused by limited space of the optical hutch. To solve this problem a Pinole Camera is implemented in the front-end of BL7B in return for the beamline extension. The progresses on the new x-ray imaging system is introduced in this presentation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC17
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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THOA03	Progress on Transverse Beam Profile Measurement Using the Heterodyne Near Field Speckles Method at ALBA	scattering, target, undulator, experiment	538
	S. Mazzoni, F. Roncarolo, G. Trad CERN, Geneva, Switzerland U. Iriso, C. Kamma-Lorger, A.A. Nosych ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain M.A.C. Potenza Universita’ degli Studi di Milano & INFN, Milano, Italy M. Siano Università degli Studi di Milano, Milano, Italy
	We present the recent developments of a study aiming at measuring the transverse beam profile using the Heterodyne Near Field Speckles (HNFS) method. The HNFS technique consists of a suspension of nanoparticles suspended in a liquid and illuminated by synchrotron radiation (either in the visible or in X-ray wavelength range). The transverse coherence of the source, and therefore, under the conditions of validity of the Van Cittert and Zernike theorem, the transverse electron beam size is retrieved from the interference between the transmitted beam and the spherical waves scattered by each nanoparticle. We here describe the fundamentals of this technique, as well as the recent experimental results obtained with 12 keV radiation at the NCD beamline at ALBA. The applicability of such technique for future accelerators (e.g. CLIC or FCC) is also discussed.
	Slides THOA03 [2.414 MB]
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THOB03	Long Term Investigation of the Degradation of Coaxial Cables	insertion, scattering, operation, photon	552
	M. Kuntzsch, R. Schurig HZDR, Dresden, Germany S.J. Burger Delta Gamma RF-Expert, Melbourne, Australia T. Weber el-spec GmbH, Geretsried, Germany
	For the transport of RF signals coaxial cables with PTFE (’Teflon’) as dielectric medium are widely used because they offer a wide bandwidth and low insertion loss. Coaxial cables that are routed in immediate vicinity to the beamline are exposed to ionizing radiation that is mainly generated by beam-loss. In this radiative environment cables change their electrical properties which directly affects the signal on the receiver side and in turn the measured beam parameters. This contribution describes a measurement setup at the superconducting CW accelerator ELBE that was used to investigate the degradation of coaxial cables under well-controlled conditions up to an accumulated dose of 94 kGy. Furthermore the acquired data up to 40 GHz of two coaxial cable samples are presented and the results are discussed.
	Slides THOB03 [6.958 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB03
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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Paper

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Other Keywords

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MOPA02

Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation

injection, timing, extraction, operation

29

H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama
KEK, Ibaraki, Japan

The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.

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

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MOPA06

Recent Advances in Beam Monitoring During SEE Testing on ISDE&JINR Heavy Ion Facilities

detector, monitoring, heavy-ion, real-time

36

P.A. Chubunov
ISDE, Moscow, Russia
V.S. Anashin
United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia
A. Issatov
JINR/FLNR, Moscow region, Russia
S.V. Mitrofanov
JINR, Dubna, Moscow Region, Russia

SEE testing of candidate electronic components for space applications is essential part of a spacecraft radiation hardness assurance process in terms of its operability in the harsh space radiation environment. The unique in Russia SEE test facilities have been created to provide SEE testing. The existing ion beam monitoring system has been presented at IBIC 2017, however, it has a number of shortcomings related to the lack of reliable online ion fluence measurement on the DUT, and inability to measure energies of the high-energy (15-60 MeV/nucleon) long-range (10-2000 µm) ions on the DUT. The paper presents the latest developments and their test results of the ISDE and JINR collaboration in the field of flux online monitoring (including, on the DUT) during tests using scintillation detectors based on flexible optical fibers, and measuring ion energies by the method of total absorption in the volume of scintillation or semiconductor detector. The modernization of the standard beam monitoring procedure during tests is proposed.

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MOPA07

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

electron, diagnostics, linac, proton

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, linac, DTL, proton

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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MOPA17

Momentum Compaction Measurement Using Synchrotron Radiation

SRF, electron, photon, experiment

66

L. Torino, N. Carmignani, A. Franchi
ESRF, Grenoble, France

The momentum compaction factor of a storage ring can be obtained by measuring how the beam energy changes with the RF frequency. Direct measurement of the beam energy can be difficult, long or even not possible with acceptable accuracy and precision in some machines such as ESRF. Since the energy spectrum of the Synchrotron Radiation (SR) depends on the beam energy, it is indeed possible to relate the variation of the beam energy with a variation of the produced SR flux. In this proceeding, we will present how we obtain a measurement of the momentum compaction using this dependence.

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MOPB07

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

proton, target, 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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MOPC03

Precise Measurement of Small Currents at the MLS

electron, experiment, storage-ring, synchrotron

118

Y. Petenev, J. Feikes, J. Li, A.N. Matveenko, Y. Tamashevich
HZB, Berlin, Germany
R. Klein, J. Lubeck, R. Thornagel
PTB, Berlin, Germany

The Physikalisch-Technische Bundesanstalt (PTB), the National Metrology Institute of Germany, utilizes an electron storage ring - the Metrology Light Source (MLS), located in Berlin, as a radiation source standard in the VIS, UV and VUV spectral range. In order to be able to calculate the absolute intensity of the radiation, the electron beam current has to be measured with low uncertainty. In this paper we focus on the measurement of the beam current in a range of several nA to 1 pA (one electron) by means of Si photodiodes, detecting synchrotron radiation from the beam. Electrons are gradually scraped out of the ring and the diode signal is analyzed afterwards. The exact number of stored electrons then can be derived from the signal. The measurement is carried out automatically with an in-house developed software.

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TUOB03

Demonstration of a Newly Developed Pulse-by-pulse X-Ray Beam Position Monitor in SPring-8

detector, operation, storage-ring, ISOL

182

H. Aoyagi, Y. Furukawa, S. Takahashi, A. Watanabe
JASRI/SPring-8, Hyogo, Japan

Funding: This work was partly supported by Japan Society for the Promotion of Science through a Grant-in-Aid for Scientific Research (c), No. 20416374 and No. 18K11943.
A newly designed pulse-by-pulse X-ray beam position monitor (XBPM), which is photoemission type, has been demonstrated successfully in the SPring-8 synchrotron radiation beamline. Conventional XBPMs work in the direct-current (DC) mode, because it is difficult to measure a beam position in the pulse mode under the sever heat load condition. The key point of the design is aiming at improving heat-resistance property without degradation of high frequency property [1]. This monitor is equipped with microstripline structure for signal transmission line to achieve pulse-by-pulse beam position signal. A photocathode is titanium electrode that is sputtered on a diamond heat sink to achieve high heat resistance. We have manufactured the prototype, and demonstrated feasibility at the SPring-8 bending magnet beamline. As a result, we observed a unipolar single pulse with the pulse length of less than 1 ns FWHM and confirmed that it has pulse-by-pules position sensitivity [2]. Furthermore, this monitor can be also used in the direct-current mode with good stability and good resolution. The operational experience will be also presented.
[1] http://accelconf.web.cern.ch/AccelConf/medsi2016/papers/wepe10.pdf
[2] http://www.pasj.jp/web_publish/pasj2017/proceedings/PDF/THOM/THOM06.pdf

Slides TUOB03 [2.380 MB]

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TUOC04

Development of Beam Position Monitor for the SPring-8 Upgrade

electron, electronics, storage-ring, brilliance

204

H. Maesaka
RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
H. Dewa, T. Fujita, M. Masaki, S. Takano
JASRI, Hyogo, Japan

We are developing a new electron beam position monitor (BPM) system for the low-emittance upgrade of SPring-8. The requirements for the BPM system are: (1) a single-pass resolution of 100 µm rms for a 100 pC bunch and an electric center accuracy of 100 µm rms for the initial beam commissioning to achieve the first turn, (2) a closed-orbit distortion (COD) resolution better than 0.1 µm rms for a 100 mA stored beam and a position stability of less than 5 µm for the ultimate stability of a photon beam axis. We have completed prototypes of a precise button electrode and a BPM block to obtain high-intensity signals and sufficient mechanical accuracy while suppressing high-Q trapped modes leading to impedance and heating issues. The development of readout electronics based on the MTCA.4 standard and the evaluation of radiation-hard coaxial cables have also been conducted. The prototype BPM head was installed in the present SPring-8 storage ring for performance verification with an actual electron beam. We confirmed sufficient signal intensity, electric center accuracy, position stability, etc. by the beam test. The new BPM system is almost ready for the SPring-8 upgrade.

Slides TUOC04 [2.126 MB]

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TUPA09

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

neutron, proton, 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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TUPA14

Beam Loss Monitoring in the ISIS Synchrotron Main Dipole Magnets

dipole, detector, synchrotron, controls

236

D.M. Harryman, S.A. Fisher, W.A. Frank, B. Jones, A. Pertica, D.W. Posthuma de Boer, C.C. Wilcox
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Beam loss monitoring at the ISIS Neutron and Muon Source is primarily carried out with the use of gas ionisation chambers filled with argon. These chambers are 3 to 4m long and are positioned around the inside of the synchrotron as well as along the ISIS Linac and Extracted Proton Beamlines (EPBs). To achieve finer spatial resolution a programme has been implemented to install six scintillator Beam Loss Monitors (BLMs), each 300 mm long, inside each of the ten main dipole magnets. Using these scintillator BLMs the accelerator can be fine-tuned during set-up to reduce areas of beam loss that were previously unseen or hard to characterise. As the installation programme comes to an end, this paper will review: the installation of the scintillator BLMs, the electronic hardware and software used to control them, and the initial measurements that have been taken using them.

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WEOB02

RadFET Dose Monitor System for SOLEIL

electron, electronics, storage-ring, vacuum

353

N. Hubert, F. Dohou, M. El Ajjouri, D. Pédeau
SOLEIL, Gif-sur-Yvette, France

Soleil is currently testing new dose monitors based on RadFET transistors. This new detector at SOLEIL will provide a measurement of the dose received by equipment that are damaged by the radiations in the storage ring, and to anticipate their replacement. This monitor should be very compact to be placed in tiny areas, sensitive to all kind of radiation and low cost to install many of them around the ring. A readout electronic module is being developed in-house, and a first prototype has been build and installed on the machine. Description of the system and first results recorded on the machine are presented.

Slides WEOB02 [4.250 MB]

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WEPA12

Differential Evolution Genetic Algorithm for Beam Bunch Temporal Reconstruction

electron, laser, FEL, experiment

392

D. Wu, T.H. He, C.L. Lao, P. Li, J. Liu, X. Luo, Q. Pan, L.J. Shan, X. Shen, J. Wang, D.X. Xiao, L.G. Yan, P. Zhang, K. Zhou
CAEP/IAE, Mianyang, Sichuan, People’s Republic of China
Y. Liu
CAEP/IFP, Mainyang, Sichuan, People’s Republic of China

Funding: Work supported by China National Natural Science Foundation of China with grant (11475159, 11505173, 11505174, 11575264, 11605190 and 11105019)
Coherent radiation, such as coherent transition radiation, coherent diffraction radiation, coherent synchrotron radiation, etc, can be used to measure the longitudinal distribution of the electron beam bunch of any length, as long as the coherent radiation spectrum can be measured. In many cases, the Kramers-Krönig relationship is used to reconstruct the temporal distribution of the beam from the coherent radiation spectrum. However, the extrapolation of the low frequency will introduce the uncertainty of the reconstruction. In this paper, an algorithm of differential evolution (DE) for temporal reconstruction is discussed. The DE reconstruction works well for the complex and ultrashort distribution. It will be an effectIve tool to accurately measure the femtosecond bunch temporal structure.

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WEPA16

Micro-Bunching Instability Monitor for X-ray Free Electron Laser

electron, bunching, laser, linac

404

C. Kim, H.-S. Kang, G. Kim, I.S. Ko
PAL, Pohang, Kyungbuk, Republic of Korea
J.H. Ko
POSTECH, Pohang, Kyungbuk, Republic of Korea

A direct method was developed to measure the micro-bunching instability in the X-ray Free Electron Laser (XFEL). The micro-bunching instability comes from the interaction between the electron beam and the coherent synchrotron radiation (CSR), and the FEL intensity can be affected significantly by the micro-bunching instability. However, no effective method had been introduced to monitor the micro-bunching instability, so that we installed a CCD camera to measure the micro-bunching instability after the bunch compressor. The CCD camera showed the micro-bunching instability successfully, and more interesting features of the micro-bunching instability were revealed from it.

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WEPB01

Photon Beam Imager at SOLEIL

undulator, vacuum, operation, photon

425

M. Labat, J. Da Silva, N. Hubert, F. Lepage
SOLEIL, Gif-sur-Yvette, France

In one of the long straight sections of SOLEIL is installed a pair of canted in-vacuum undulators for the ANATOMIX and NANOSCOPIUM beamlines. Since the upstream undulator radiation can potentially damage the downstream undulator magnets, an accurate survey of the respective alignment of the two devices is mandatory. An XBPM has been initially installed for this purpose in the beamline frontend. For redundancy and further analysis, an X-ray imager was then designed and added just downstream the XBPM. It is made of a diamond plate that can be inserted into the upstream beamline frontend at low current. Fluorescence of the Nitrogen impurities in the diamond is imaged on a CCD to check that the upstream radiation is not hitting the downstream insertion device. We present the commissioning of this new device together with its first results in operation.

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WEPB11

Spatial Resolution Improvement of OTR Monitors by Off-axis Light Collection

electron, target, diagnostics, photon

451

A. Potylitsyn, A.I. Novokshonov, L.G. Sukhikh
TPU, Tomsk, Russia
G. Kube, A.I. Novokshonov
DESY, Hamburg, Germany

Funding: The work was partly supported by the program "Nauka" of the Russian Ministry of Education and Science, grant #3.1903.2017
The spatial resolution of an OTR monitor for electron beam profile diagnostics is determined by the resolution of the optical system and by the Point Spread Function (PSF) representing the single electron image. In the image plane, the PSF has a typical lobe-shape distribution with an inter-peak distance depending on wavelength and lens aperture ratio [*]. For a beam with a transverse rms size smaller than the distance, the reconstruction of the beam profile has several difficulties [**, ***]. We propose to reduce the PSF contribution and to improve the spatial resolution of an OTR monitor simply by rotating the lens optical axis with respect to the specular reflection direction. If the difference between the rotational angle and the lens aperture is much larger than the inverse Lorentz factor, the PSF has a Gaussian-like distribution which matches practically with the Airy distribution. Thus the resolution depends on wavelength and lens aperture. In principle, for lens apertures in the order of 0.1 rad such an approach should allow to measure beam sizes comparable to the wavelength of observation, using a simple deconvolution procedure for the measured image and the PSF.
* M. Castellano, V.Verzilov, Phys. Rev. ST-AB, 1 (1998).
** K.Kruchinin, S.T.Boogert, P.Karataev et al., Proc. IBIC 2013 (2013).
*** L.G. Sukhikh, A.P. Potylitsyn, G. Kube, Phys. Rev. AB 20 (2017).

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WEPB14

Recent Results on Non-invasive Beam Size Measurement Methods Based on Polarization Currents

target, experiment, polarization, photon

464

S. Mazzoni, M. Bergamaschi, O.R. Jones, R. Kieffer, T. Lefèvre, F. Roncarolo
CERN, Geneva, Switzerland
A. Aryshev, N. Terunuma
KEK, Ibaraki, Japan
M.G. Billing, J.V. Conway, M.J. Forster, Y.L.P. Fuentes, J.P. Shanks, S. Wang, L.Y. Ying
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
V.V. Bleko, A.S. Konkov, A. Potylitsyn
TPU, Tomsk, Russia
L. Bobb
DLS, Oxfordshire, United Kingdom
P. Karataev, K. Lekomtsev
JAI, Egham, Surrey, United Kingdom
P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom

We present recent results on non-invasive beam profile measurement techniques based on Diffraction Radiation (DR) and Cherenkov Diffraction Radiation (ChDR). Both methods exploit the analysis of broadband electromagnetic radiation resulting from polarization currents produced in, or at the boundary of, a medium in close proximity of a charged particle beam. To increase the resolution of DR, measurements were performed in the UV range at a wavelength of 250 nm. With such configurations, sensitivity to the beam size of a 1.2 GeV electron beam below 10 um was observed at the Accelerator Test Facility (ATF) at KEK, Japan. In the case of the ChDR, a proof of principle study was carried out at the Cornell Electron Storage Ring (CESR) where beam profiles were measured in 2017 on a 5.3 GeV positron beam. At the time of writing an experiment to measure the resolution limit of ChDR has been launched at ATF where smaller beam sizes are available. We will present experimental results and discuss the application of such techniques for future accelerators.

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WEPC04

Setup for Beam Profile Measurements using Optical Transition Radiation

target, electron, linac, diagnostics

494

J. Pforr, M. Arnold, T. Bahlo, L.E. Jürgensen, N. Pietralla, A. Rost
TU Darmstadt, Darmstadt, Germany
F. Hug
KPH, Mainz, Germany

Funding: Work supported by DFG through GRK 2128.
The S-DALINAC is a thrice-recirculating, superconducting linear electron accelerator at TU Darmstadt. It can provide beams of electrons with energies up to 130 MeV and currents of 20 µA. The accelerator performance was improved by an extension of the beam diagnostics, as this increases the reproducibility of the machine settings. Therefore, the installation of several beam profile measurement stations is planned, which should be operational down to a beam current of 100 nA, as this current is used for beam tuning. Combining these devices with a quadrupole scan also allows for emittance measurements. The beam profile measurements shall be done based on optical transition radiation (OTR), resulting from the penetration of relativistic electrons from vacuum into a metal target. The radiation can be detected using standard cameras that provide information on the two-dimensional particle distribution. This contribution will address the layout of the measurement stations and a first test measurement will be presented.

Poster WEPC04 [1.189 MB]

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WEPC08

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

proton, photon, operation, simulation

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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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC08

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paper received ※ 06 September 2018 paper accepted ※ 13 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

proton, 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.

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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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WEPC17

X-ray Pinhole Camera in the Diagnostics Beamlime BL7B at PLS-II

photon, electron, diagnostics, beam-diagnostic

519

J.J. Ko, J.Y. Huang, D. Kim, D.W. Lee, B.H. Oh, S. Shin, J. U. Yu
PAL, Pohang, Kyungbuk, Republic of Korea
M. Yoon
POSTECH, Pohang, Kyungbuk, Republic of Korea

The beam diagnostics beamline BL7B using synchrotron radiation with 8.6 keV critical photon energy from bending magnet has been used to measure the electron-beam size and photon-beam profile on real-time basis. After the completion of the PLS-II, the Compound Refractive Lens (CRL) system was implemented in the optical hutch at BL7B to measure the electron-beam size from X-ray imaging. But we could not have a good image due to short focal length caused by limited space of the optical hutch. To solve this problem a Pinole Camera is implemented in the front-end of BL7B in return for the beamline extension. The progresses on the new x-ray imaging system is introduced in this presentation.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC17

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paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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THOA03

Progress on Transverse Beam Profile Measurement Using the Heterodyne Near Field Speckles Method at ALBA

scattering, target, undulator, experiment

538

S. Mazzoni, F. Roncarolo, G. Trad
CERN, Geneva, Switzerland
U. Iriso, C. Kamma-Lorger, A.A. Nosych
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
M.A.C. Potenza
Universita’ degli Studi di Milano & INFN, Milano, Italy
M. Siano
Università degli Studi di Milano, Milano, Italy

We present the recent developments of a study aiming at measuring the transverse beam profile using the Heterodyne Near Field Speckles (HNFS) method. The HNFS technique consists of a suspension of nanoparticles suspended in a liquid and illuminated by synchrotron radiation (either in the visible or in X-ray wavelength range). The transverse coherence of the source, and therefore, under the conditions of validity of the Van Cittert and Zernike theorem, the transverse electron beam size is retrieved from the interference between the transmitted beam and the spherical waves scattered by each nanoparticle. We here describe the fundamentals of this technique, as well as the recent experimental results obtained with 12 keV radiation at the NCD beamline at ALBA. The applicability of such technique for future accelerators (e.g. CLIC or FCC) is also discussed.

Slides THOA03 [2.414 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOA03

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paper received ※ 05 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

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THOB03

Long Term Investigation of the Degradation of Coaxial Cables

insertion, scattering, operation, photon

552

M. Kuntzsch, R. Schurig
HZDR, Dresden, Germany
S.J. Burger
Delta Gamma RF-Expert, Melbourne, Australia
T. Weber
el-spec GmbH, Geretsried, Germany

For the transport of RF signals coaxial cables with PTFE (’Teflon’) as dielectric medium are widely used because they offer a wide bandwidth and low insertion loss. Coaxial cables that are routed in immediate vicinity to the beamline are exposed to ionizing radiation that is mainly generated by beam-loss. In this radiative environment cables change their electrical properties which directly affects the signal on the receiver side and in turn the measured beam parameters. This contribution describes a measurement setup at the superconducting CW accelerator ELBE that was used to investigate the degradation of coaxial cables under well-controlled conditions up to an accumulated dose of 94 kGy. Furthermore the acquired data up to 40 GHz of two coaxial cable samples are presented and the results are discussed.

Slides THOB03 [6.958 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB03

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paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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