IBIC2018 - List of Keywords (simulation)

Paper	Title	Other Keywords	Page
MOPB04	Progress in the Stripline Kicker for ELBE	kicker, electron, laser, neutron	78
	Ch. Schneider, A. Arnold, J. Hauser, P. Michel HZDR, Dresden, Germany
	The linac based cw electron accelerator ELBE operates different secondary beamlines one at a time. For the future different end stations should be served simultaneously, hence specific bunch patterns have to be kicked into different beam-lines. The variability of the bunch pattern and the frequency resp. switching time are one of the main arguments for a stripline-kicker. A design with two tapered active electrodes and two ground fenders was optimized in time and frequency domain with the software package CST. From that a design has been transferred into a construction and was manufactured. The presentation summarises the recent results and the status of the project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB04
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPB06	DAΦNE Luminosity Monitor	luminosity, detector, scattering, experiment	81
	A. De Santis, C. Bisegni, O.R. Blanco-García, O. Coiro, A. Michelotti, C. Milardi, A. Stecchi INFN/LNF, Frascati (Roma), Italy
	The DAΦNE collider instantaneous luminosity has been measured identifying Bhabha scattering events at low polar angle (∼10°) around the beam axis by using two small crystal calorimeters shared with the KLOE-2 experiment. Independent DAQ setup based on !CHAOS, a novel Control System architecture, has been designed and realized in order to implement a fast luminosity monitor, also in view of the DAΦNE future physics runs. The realized setup allows for measurement of Bunch-by-Bunch (BBB) luminosity that allows to investigate the beam-beam interaction for the Crab-Waist collisions at DAΦNE and luminosity dependence on the bunch train structure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB06
About •	paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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MOPB08	Evaluation of the Transverse Impedanse of Pf in-Vacuum Undulator Using Local Orbit Bump Method	factory, undulator, impedance, betatron	89
	O. A. Tanaka, M. Adachi, K. Harada, R. Kato, N. Nakamura, T. Obina, R. Takai, Y. Tanimoto, K. Tsuchiya, N. Yamamoto KEK, Ibaraki, Japan
	When a beam passes through insertion devices (IDs) with narrow gap or beam ducts with small aperture, it receives a transverse kick from the impedances of those devices. This transverse kick depends on the beam trans-verse position and beam parameters such as the bunch length and the total bunch charge. In the orbit bump method, the transverse kick factor of an ID is estimated through the closed orbit distortion (COD) measurement at many BPMs for various beam currents [1]. In the present study, we created an orbit bump of 1 mm using four steering magnets, and then measured the COD for two cases: when the gap is opened (the gap size is 42 mm) and when the gap is closed (the gap size is 3.83 mm). The ID’s kick factors obtain by these measurements are compared with those obtain by simulations and analytical evaluations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB08
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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MOPC10	Upgrade and Improvement of CT Based on TMR	electron, electronics, vacuum, power-supply	134
	Y. Zhao, Y.Y. Du, L. Wang IHEP, Beijing, People’s Republic of China
	The CT based on TMR sensor has been developed in the lab. For Improving the accuracy and linearity, re-ducing the influence of sensor position, a series simu-lation and calculation have been done which conduct an upgrade both in the mechanical structure and elec-tronics design. Lab test shows good results and test on beam will be carried on soon.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC10
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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TUOA02	Application of Machine Learning to Beam Diagnostics	network, optics, diagnostics, controls	169
	E. Fol, J.M. Coello de Portugal, R. Tomás CERN, Meyrin, Switzerland
	Machine learning techniques are used in various scientific and industry fields as a powerful tool for data analysis and automatization. The presentation is devoted to exploration of relevant machine learning methods for beam diagnostics. The target is to provide an insight into modern machine learning techniques, which can be applied to improve current beam diagnostics and general applications in accelerators. Possible concepts for future applications are also presented.
	Slides TUOA02 [2.497 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOA02
About •	paper received ※ 04 September 2018 paper accepted ※ 10 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, proton	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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TUPB09	The Evaluation of Beam Inclination Angle on the Cavity BPM Position Measurement	cavity, FEL, experiment, electron	278
	J. Chen, L.W. Lai, Y.B. Leng, L.Y. Yu, R.X. Yuan SINAP, Shanghai, People’s Republic of China
	Cavity beam position monitor (CBPM) is widely used to measure the transverse position in free-electron laser (FEL) and international linear collider (ILC) facilities due to the characteristic of high sensitive. In order to study the limiting factors of the position resolution of cavity BPM, the influence of beam inclination angle on the measure-ment of CBPM position and the direction of beam deflec-tion was analyzed. The simulation results show that the beam inclination angle is an important factor limiting the superiority of CBPM with extremely high position resolu-tion. The relative beam experiments to change the relative inclination angle between the cavity and the electron beam based on a 4-dimension moveable platform were performed in Shanghai Soft X-ray FEL (SXFEL) facility, the experiment results will also be mentioned as well.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB09
About •	paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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TUPB14	New Beam Position Monitors for the CERN LINAC3 to LEIR Ion Beam Transfer Line	electron, linac, solenoid, vacuum	293
	L. Søby, G. Baud, M. Bozzolan, R. Scrivens CERN, Geneva, Switzerland
	The injection line into the CERN Low Energy Ion Ring (LEIR) has recently been equipped with nine, new, electrostatic Beam Position Monitors (BPMs) in order to measure and optimize the trajectory of the low intensity ion beams coming from LINAC3. In this paper, we describe the design of the BPM, the low noise charge amplifier mounted directly on the BPM, and the digital acquisition system. There is special emphasis on the first commissioning results where the measured beam positions were seen to be perturbed by EMI and charging of the BPM electrodes by secondary particles. The effect of mitigation measures, including repelling voltages on the electrodes and external magnetic fields, are also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB14
About •	paper received ※ 03 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
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TUPC05	Influence of Sampling Rate and Passband on the Performance of Stripline BPM	experiment, FEL, data-acquisition, electron	307
	T. Wu, S.S. Cao, F.Z. Chen, Y.B. Leng, Y.M. Zhou SSRF, Shanghai, People’s Republic of China J. Chen, L.W. Lai SINAP, Shanghai, People’s Republic of China
	It is obviously that the property of SBPM is influenced by data acquisition system, but how the procedure of data acquisition and processing takes effect is still room for enquiring into it. This paper will present some data simulation and experiment results to discuss the function between resolution and pass band, sampling rate or other influence factor. We hope that this paper would give some advice for building up data acquisition system of SBPM.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC05
About •	paper received ※ 05 September 2018 paper accepted ※ 10 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, proton, 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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WEPB10	Grating Scanner for Measurement of Micron-size Beam Profiles	electron, photon, positron, collider	448
	L.G. Sukhikh, A. Potylitsyn, S.A. Strokov TPU, Tomsk, Russia G. Kube, K. Wittenburg 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 Wire scanners are widely used for transverse beam size diagnostics. The minimum detectable beam size is affected by the diameter of a single wire. The smallest carbon or tungsten wires used so far have diameters of about 4 microns. With the development of modern electron accelerators and the demands from future linear electron-positron colliders, sub-micron beam sizes have to be resolved. In order to increase the resolution, the decrease of the wire diameter is required. The authors of Ref. * proposed to manufacture thin gold stripes of rectangular shape (widths are equal to 1 µm or 2 µm and height is equal to 3 µm) on Si₃N₄ membrane. We propose to use another arrangement of gold stripes with varying period on a Si substrate. A set of 11 stripes with 1 µm width and 10 micron height with varying gap width in the range 3-0.25 µm ("grating scanner") was simulated by using an analytical model and by the Geant4 code. By moving this scanner across the beam one could measure the Bremsstrahlung yield vs. the coordinate, resulting in an oscillating dependence. The visibility of the resulting image allows defining the beam sizes in the range of 0.5-1.5 µm for the proposed scanner parameters. * S. Borrelli et al., "Generation and Measurement of Sub-Micrometer Relativistic Electron Beams", arXiv:1804.04252v1 [physics.acc-ph] 11 Apr 2018
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB10
About •	paper received ※ 05 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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WEPB12	Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT	instrumentation, HOM, ion-source, distributed	455
	C.A. Thomas, T.J. Grandsaert, H. Kocevar, Ø. Midttun, N. Milas, R. Miyamoto, T.J. Shea ESS, Lund, Sweden
	Non-invasive Profile Monitors are designed and distributed along the ESS Linac. In the Low Energy Beam Transport (LEBT), a specific one has been designed to be primarily a beam position monitor. Its main requirement is to measure the beam position with 100µm accuracy, and in addition it provides the beam profile and size. This performance have been shown to be possible and remains to be demonstrated experimentally. The instrument is also potentially capable of measuring the angle of the beam and its divergence. In this paper we will study the accuracy of such a measurement as function of the instrument image quality.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB12
About •	paper received ※ 05 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, proton, 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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WEPC02	Synchrotron Emittance Analysis Procedure at MedAustron	emittance, synchrotron, MMI, betatron	490
	L. Adler, A. De Franco, F. Farinon, N. Gambino, G. Guidoboni, C. Kurfürst, S. Myalski, M.T.F. Pivi, C. Schmitzer, I. Strašík, A. Wastl EBG MedAustron, Wr. Neustadt, Austria
	MedAustron is a synchrotron based medical accelerator facility for particle therapy providing protons and carbon ions with clinical energies from 60 MeV to 250 MeV and 120 MeV/n to 400 MeV/n respectively. The facility features four irradiation rooms, three of which are dedicated to clinical operation and a fourth one to non-clinical research. Commissioning of all fixed lines has been completed for protons, while the commissioning for carbon ions and a proton gantry is ongoing. For the commissioning of carbon ions, precise measurements of the transverse beam emittance in the synchrotron are of importance, to minimize beam losses and to correct for possible emittance variations due to the different clinically relevant beam intensities defined by a degrader at the end of the Linac. The transverse beam emittance in the MedAustron synchrotron is measured via scraping at non-dispersive regions of the ring. The analysis procedure as well as emittance reconstruction accuracy for simulated data will be described in this paper, together with measurement results from the carbon commissioning.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC02
About •	paper received ※ 05 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, 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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WEPC16	Design and Radiation Simulation of the Scintillating Screen Detector for Proton Therapy Facility	radiation, proton, photon, 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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THOB02	Energy Loss Measurements with Streak Camera at ALBA	injection, storage-ring, synchrotron, GUI	548
	A.A. Nosych, B. Bravo, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	Analyzing streak camera images of the beam injected into a Storage Ring with no RF voltage allows calculating several parameters, like the energy loss per turn and the energy mismatch between injected and stored beams. These measurements are based on the analysis of the centroid drift path of a bunch as it spirals inwards, changing its rotation period. This drift is clear and measurable in single and multi-bunch modes in several horizontal sweep speeds of the streak. With this technique we also measure the momentum compaction factor and observe its change with respect to the insertion devices’ open/closed states. The obtained values are comparable with theoretical expectations, as well as with values measured by other means.
	Slides THOB02 [3.030 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB02
About •	paper received ※ 07 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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Paper

Title

Other Keywords

Page

MOPB04

Progress in the Stripline Kicker for ELBE

kicker, electron, laser, neutron

78

Ch. Schneider, A. Arnold, J. Hauser, P. Michel
HZDR, Dresden, Germany

The linac based cw electron accelerator ELBE operates different secondary beamlines one at a time. For the future different end stations should be served simultaneously, hence specific bunch patterns have to be kicked into different beam-lines. The variability of the bunch pattern and the frequency resp. switching time are one of the main arguments for a stripline-kicker. A design with two tapered active electrodes and two ground fenders was optimized in time and frequency domain with the software package CST. From that a design has been transferred into a construction and was manufactured. The presentation summarises the recent results and the status of the project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB04

About •

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

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MOPB06

DAΦNE Luminosity Monitor

luminosity, detector, scattering, experiment

81

A. De Santis, C. Bisegni, O.R. Blanco-García, O. Coiro, A. Michelotti, C. Milardi, A. Stecchi
INFN/LNF, Frascati (Roma), Italy

The DAΦNE collider instantaneous luminosity has been measured identifying Bhabha scattering events at low polar angle (∼10°) around the beam axis by using two small crystal calorimeters shared with the KLOE-2 experiment. Independent DAQ setup based on !CHAOS, a novel Control System architecture, has been designed and realized in order to implement a fast luminosity monitor, also in view of the DAΦNE future physics runs. The realized setup allows for measurement of Bunch-by-Bunch (BBB) luminosity that allows to investigate the beam-beam interaction for the Crab-Waist collisions at DAΦNE and luminosity dependence on the bunch train structure.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB06

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

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MOPB08

Evaluation of the Transverse Impedanse of Pf in-Vacuum Undulator Using Local Orbit Bump Method

factory, undulator, impedance, betatron

89

O. A. Tanaka, M. Adachi, K. Harada, R. Kato, N. Nakamura, T. Obina, R. Takai, Y. Tanimoto, K. Tsuchiya, N. Yamamoto
KEK, Ibaraki, Japan

When a beam passes through insertion devices (IDs) with narrow gap or beam ducts with small aperture, it receives a transverse kick from the impedances of those devices. This transverse kick depends on the beam trans-verse position and beam parameters such as the bunch length and the total bunch charge. In the orbit bump method, the transverse kick factor of an ID is estimated through the closed orbit distortion (COD) measurement at many BPMs for various beam currents [1]. In the present study, we created an orbit bump of 1 mm using four steering magnets, and then measured the COD for two cases: when the gap is opened (the gap size is 42 mm) and when the gap is closed (the gap size is 3.83 mm). The ID’s kick factors obtain by these measurements are compared with those obtain by simulations and analytical evaluations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB08

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

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MOPC10

Upgrade and Improvement of CT Based on TMR

electron, electronics, vacuum, power-supply

134

Y. Zhao, Y.Y. Du, L. Wang
IHEP, Beijing, People’s Republic of China

The CT based on TMR sensor has been developed in the lab. For Improving the accuracy and linearity, re-ducing the influence of sensor position, a series simu-lation and calculation have been done which conduct an upgrade both in the mechanical structure and elec-tronics design. Lab test shows good results and test on beam will be carried on soon.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC10

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

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TUOA02

Application of Machine Learning to Beam Diagnostics

network, optics, diagnostics, controls

169

E. Fol, J.M. Coello de Portugal, R. Tomás
CERN, Meyrin, Switzerland

Machine learning techniques are used in various scientific and industry fields as a powerful tool for data analysis and automatization. The presentation is devoted to exploration of relevant machine learning methods for beam diagnostics. The target is to provide an insight into modern machine learning techniques, which can be applied to improve current beam diagnostics and general applications in accelerators. Possible concepts for future applications are also presented.

Slides TUOA02 [2.497 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOA02

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paper received ※ 04 September 2018 paper accepted ※ 10 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, proton

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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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA02

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

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TUPB09

The Evaluation of Beam Inclination Angle on the Cavity BPM Position Measurement

cavity, FEL, experiment, electron

278

J. Chen, L.W. Lai, Y.B. Leng, L.Y. Yu, R.X. Yuan
SINAP, Shanghai, People’s Republic of China

Cavity beam position monitor (CBPM) is widely used to measure the transverse position in free-electron laser (FEL) and international linear collider (ILC) facilities due to the characteristic of high sensitive. In order to study the limiting factors of the position resolution of cavity BPM, the influence of beam inclination angle on the measure-ment of CBPM position and the direction of beam deflec-tion was analyzed. The simulation results show that the beam inclination angle is an important factor limiting the superiority of CBPM with extremely high position resolu-tion. The relative beam experiments to change the relative inclination angle between the cavity and the electron beam based on a 4-dimension moveable platform were performed in Shanghai Soft X-ray FEL (SXFEL) facility, the experiment results will also be mentioned as well.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB09

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

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TUPB14

New Beam Position Monitors for the CERN LINAC3 to LEIR Ion Beam Transfer Line

electron, linac, solenoid, vacuum

293

L. Søby, G. Baud, M. Bozzolan, R. Scrivens
CERN, Geneva, Switzerland

The injection line into the CERN Low Energy Ion Ring (LEIR) has recently been equipped with nine, new, electrostatic Beam Position Monitors (BPMs) in order to measure and optimize the trajectory of the low intensity ion beams coming from LINAC3. In this paper, we describe the design of the BPM, the low noise charge amplifier mounted directly on the BPM, and the digital acquisition system. There is special emphasis on the first commissioning results where the measured beam positions were seen to be perturbed by EMI and charging of the BPM electrodes by secondary particles. The effect of mitigation measures, including repelling voltages on the electrodes and external magnetic fields, are also discussed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB14

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paper received ※ 03 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

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TUPC05

Influence of Sampling Rate and Passband on the Performance of Stripline BPM

experiment, FEL, data-acquisition, electron

307

T. Wu, S.S. Cao, F.Z. Chen, Y.B. Leng, Y.M. Zhou
SSRF, Shanghai, People’s Republic of China
J. Chen, L.W. Lai
SINAP, Shanghai, People’s Republic of China

It is obviously that the property of SBPM is influenced by data acquisition system, but how the procedure of data acquisition and processing takes effect is still room for enquiring into it. This paper will present some data simulation and experiment results to discuss the function between resolution and pass band, sampling rate or other influence factor. We hope that this paper would give some advice for building up data acquisition system of SBPM.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC05

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paper received ※ 05 September 2018 paper accepted ※ 10 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, proton, 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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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC04

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

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WEPB10

Grating Scanner for Measurement of Micron-size Beam Profiles

electron, photon, positron, collider

448

L.G. Sukhikh, A. Potylitsyn, S.A. Strokov
TPU, Tomsk, Russia
G. Kube, K. Wittenburg
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
Wire scanners are widely used for transverse beam size diagnostics. The minimum detectable beam size is affected by the diameter of a single wire. The smallest carbon or tungsten wires used so far have diameters of about 4 microns. With the development of modern electron accelerators and the demands from future linear electron-positron colliders, sub-micron beam sizes have to be resolved. In order to increase the resolution, the decrease of the wire diameter is required. The authors of Ref. * proposed to manufacture thin gold stripes of rectangular shape (widths are equal to 1 µm or 2 µm and height is equal to 3 µm) on Si₃N₄ membrane. We propose to use another arrangement of gold stripes with varying period on a Si substrate. A set of 11 stripes with 1 µm width and 10 micron height with varying gap width in the range 3-0.25 µm ("grating scanner") was simulated by using an analytical model and by the Geant4 code. By moving this scanner across the beam one could measure the Bremsstrahlung yield vs. the coordinate, resulting in an oscillating dependence. The visibility of the resulting image allows defining the beam sizes in the range of 0.5-1.5 µm for the proposed scanner parameters.
* S. Borrelli et al., "Generation and Measurement of Sub-Micrometer Relativistic Electron Beams", arXiv:1804.04252v1 [physics.acc-ph] 11 Apr 2018

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB10

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

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WEPB12

Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT

instrumentation, HOM, ion-source, distributed

455

C.A. Thomas, T.J. Grandsaert, H. Kocevar, Ø. Midttun, N. Milas, R. Miyamoto, T.J. Shea
ESS, Lund, Sweden

Non-invasive Profile Monitors are designed and distributed along the ESS Linac. In the Low Energy Beam Transport (LEBT), a specific one has been designed to be primarily a beam position monitor. Its main requirement is to measure the beam position with 100µm accuracy, and in addition it provides the beam profile and size. This performance have been shown to be possible and remains to be demonstrated experimentally. The instrument is also potentially capable of measuring the angle of the beam and its divergence. In this paper we will study the accuracy of such a measurement as function of the instrument image quality.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB12

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paper received ※ 05 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, proton, 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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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB16

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

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WEPC02

Synchrotron Emittance Analysis Procedure at MedAustron

emittance, synchrotron, MMI, betatron

490

L. Adler, A. De Franco, F. Farinon, N. Gambino, G. Guidoboni, C. Kurfürst, S. Myalski, M.T.F. Pivi, C. Schmitzer, I. Strašík, A. Wastl
EBG MedAustron, Wr. Neustadt, Austria

MedAustron is a synchrotron based medical accelerator facility for particle therapy providing protons and carbon ions with clinical energies from 60 MeV to 250 MeV and 120 MeV/n to 400 MeV/n respectively. The facility features four irradiation rooms, three of which are dedicated to clinical operation and a fourth one to non-clinical research. Commissioning of all fixed lines has been completed for protons, while the commissioning for carbon ions and a proton gantry is ongoing. For the commissioning of carbon ions, precise measurements of the transverse beam emittance in the synchrotron are of importance, to minimize beam losses and to correct for possible emittance variations due to the different clinically relevant beam intensities defined by a degrader at the end of the Linac. The transverse beam emittance in the MedAustron synchrotron is measured via scraping at non-dispersive regions of the ring. The analysis procedure as well as emittance reconstruction accuracy for simulated data will be described in this paper, together with measurement results from the carbon commissioning.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC02

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paper received ※ 05 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, 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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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

radiation, proton, photon, 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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THOB02

Energy Loss Measurements with Streak Camera at ALBA

injection, storage-ring, synchrotron, GUI

548

A.A. Nosych, B. Bravo, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Analyzing streak camera images of the beam injected into a Storage Ring with no RF voltage allows calculating several parameters, like the energy loss per turn and the energy mismatch between injected and stored beams. These measurements are based on the analysis of the centroid drift path of a bunch as it spirals inwards, changing its rotation period. This drift is clear and measurable in single and multi-bunch modes in several horizontal sweep speeds of the streak. With this technique we also measure the momentum compaction factor and observe its change with respect to the insertion devices’ open/closed states. The obtained values are comparable with theoretical expectations, as well as with values measured by other means.

Slides THOB02 [3.030 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB02

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paper received ※ 07 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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