IBIC2019 - List of Keywords (diagnostics)

Paper	Title	Other Keywords	Page
MOAO03	Overview on the Diagnostics for EBS-ESRF	storage-ring, feedback, SRF, radiation	9
	L. Torino, N. Benoist, F. Ewald, E. Plouviez, J. Poitou, B. Roche, K.B. Scheidt, F. Taoutaou, F. Uberto ESRF, Grenoble, France
	On December 2018 the ESRF was shut down and the 28 years old storage ring was entirely dismantled in the following months. A new storage ring, the Extremely Brilliant Source (EBS), that had been pre-assembled in 2017 and 2018, is presently being installed and the commissioning will start in December 2019. EBS will achieve a much reduced horizontal emittance, from 4 nm to 150 pm, and will also provide the X-ray users with a more coherent synchrotron radiation beam. In this paper, we present an overview of the diagnostics systems for this new storage ring.
	Slides MOAO03 [40.660 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOAO03
About •	paper received ※ 03 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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MOCO03	Estimation of Longitudinal Profiles of Ion Bunches in the LHC Using Schottky-Based Diagnostics	synchrotron, distributed, experiment, hadron	45
	K. Łasocha, D. Alves CERN, Meyrin, Switzerland
	The Large Hadron Collider (LHC) Schottky monitors have been designed to measure various parameters of relevance to beam quality, namely tune, momentum spread and chromaticity. We present another application of this instrument - the evaluation of longitudinal bunch profiles. The relation between the distribution of synchrotron amplitudes within the bunch population and the longitudinal bunch profile is derived from probabilistic principles. Our approach, limited to bunched beams with no intra-bunch coherent motion, initially fits the cumulative power spectral density of acquired Schottky spectra with the underlying distribution of synchrotron amplitudes. The result of this fit is then used to reconstruct the bunch profile using the derived model. The results obtained are verified by a comparison with measurements from the LHC Wall Current Monitors.
	Slides MOCO03 [48.066 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOCO03
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOCO04	Overview of Bunch-Resolved Diagnostics for the Future BESSY VSR Electron-Storage Ring	electron, timing, operation, storage-ring	50
	G. Schiwietz, J.G. Hwang, M. Koopmans, M. Ries HZB, Berlin, Germany
	The upgrade of the BESSY II light source in Berlin towards the Variable pulse-length Storage-Ring BESSY VSR will lead to a complex fill pattern. This involves co-existing electron bunches with significant variations of bunch-length, bunch charge as well as charge density. Among many other boundary conditions, this calls for bunch resolved measurements with sub-ps time resolution and micrometer spatial resolution. Currently, we are constructing a diagnostic platform connected to three new dipole beamlines for visible light as well as THz measurements. The mid-term aim is a 24/7 use of beam-diagnostic tools and the development of advanced methods for specific purposes. Recently, we have set-up a sub-ps streak camera* and we are investigating other innovative methods for bunch-length as well as lateral size determination using visible light* at the first of our new diagnostic dipole beamlines. Preliminary results as well as our concepts for achieving high sensitivity, good signal-to-noise ratio and time resolution will be presented and discussed at the conference. * G.Schiwietz et al., J.Phys.:Conf. Series 1067, 072005 (2018) T.Mitsuhashi, M.Tadano, Proc. of EPAC¿02, Paris, France, p. 1936 * J.Breunlin et al., NIM- A803, pp.55 (2015) &refs. therein
	Slides MOCO04 [10.924 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOCO04
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP013	Faraday Cup Selector for DC-280 Cyclotron	controls, cyclotron, beam-transport, ECR	103
	V.V. Aleinikov, S. Pachtchenko JINR, Dubna, Moscow Region, Russia K.P. Sychev, V. Zabanova JINR/FLNR, Moscow region, Russia
	New isochronous cyclotron DC-280, the basic facility of Super Heavy Element (SHE) factory was put into operation in the FLNR JINR on March 25, 2019. Key role in beam diagnostics for lossless transportation is played by Faraday cups. Five elements were installed along the two injection lines, and 12 elements on the five transport channels to the experimental facilities. The software was developed to automatically select the active Faraday cup depending on its location and track the current on a single indicator. This paper describes basic principles and algorithm of the Faraday cup Selector module which is a part of the DC-280 cyclotron control system.
	Poster MOPP013 [2.214 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP013
About •	paper received ※ 27 August 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP035	Electron Beam Diagnostics Concept for the LWFA Driven FEL at ELI-Beamlines	electron, FEL, cavity, plasma	184
	K.O. Kruchinin, D. Kocon, A.Y. Molodozhentsev ELI-BEAMS, Prague, Czech Republic A. Lyapin JAI, Egham, Surrey, United Kingdom
	Uniquely short high energy electron bunches produced by compact Laser Wakefield Accelerators (LWFA) are attractive for the development of new generation Free Electron Lasers (FEL). Although the beam quality of LWFA is still significantly lower than provided by conventional accelerators, with persistent progress seen in the area of laser plasma acceleration, they have a great potential to be considered the new generation drivers for FELs and even colliders. A new LWFA based FEL project called "LUIS" is currently being commissioned at ELI-beamlines in Czech Republic. LUIS aims to demonstrate a stable generation of X-ray photons with a wavelengths of 6 nm and lower, suitable for user applications. Electron beam diagnostics are absolutely crucial for achieving LUIS’s aims. Low charge, poor beam stability and other beam properties inherent for a LWFA require rethinking and adaptation of the conventional diagnostic tools and, in some cases, development of new ones. In this paper we provide an overview of the electron beam instrumentation in LUIS with a focus on the current challenges and some discussion of the foreseen future developments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP035
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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MOPP036	SPIRAL2 Diagnostic Qualifications with RFQ beams	rfq, linac, emittance, MEBT	188
	C. Jamet, T. Andre, V. Langlois, T. Le Ster, G. Ledu, P. Legallois, S. Leloir, F. Lepoittevin, S. Loret, C. Potier de courcy, R.V. Revenko GANIL, Caen, France
	The SPIRAL2 accelerator, built on the GANIL’s facility, at CAEN in FRANCE is dedicated to accelerate light and heavy ion beams up to 5mA and 40 MeV. The continuous wave accelerator is based on two ECR ion sources, a RFQ and a superconducting LINAC. The beam commissioning of the RFQ finished at the end of 2018. This paper presents the Diagnostic-Plate installed behind the RFQ, with all associated accelerator diagnostics. Diagnostic monitors, measured beam parameters, results are described and analyzed. A brief presentation of the next steps is given.
	Poster MOPP036 [1.558 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP036
About •	paper received ※ 03 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP037	Status of Beam Instrumentation for FAIR HEBT	detector, proton, electron, antiproton	193
	M. Schwickert, P. Boutachkov, T. Hoffmann, H. Reeg, A. Reiter, B. Walasek-Höhne GSI, Darmstadt, Germany
	At present the Facility for Antiproton and Ion Research (FAIR) is under construction at the GSI site. As part of the FAIR project the beamlines of the High Energy Beam Transport (HEBT) section interconnect the synchrotrons, storage rings and experimental caves. The large range of beam energies (MeV to GeV) and beam intensities up to 10¹² particles per pulse for uranium, or up to 2·10¹³ particles per pulse for protons, demand in many cases for purpose-built beam diagnostic devices. Presently, the main diagnostic components are being manufactured by international in-kind partners in close collaboration with GSI. This contribution presents an overview of the beam instrumentation layout of the FAIR HEBT and summa-rizes the present status of developments for HEBT beam diagnostics. We focus on the status of the foreseen beam current transformers, particle detectors, scintillating screens and profile grids.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP037
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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MOPP038	The Beam Diagnostics Test Bench for the Commissioning of the Proton Linac at FAIR	linac, proton, dipole, quadrupole	196
	S. Udrea, P. Forck, C.M. Kleffner, K. Knie, T. Sieber GSI, Darmstadt, Germany
	A dedicated proton injector for FAIR (the pLinac) is presently under construction at GSI Darmstadt. This accelerator is designed to deliver a beam current of up to 70 mA with a final energy of 68 MeV for the FAIR anti-proton program. For the commissioning of the pLinac a movable beam diagnostics test bench will be used to characterize the proton beam at different locations during the stepwise installation. The test bench will consist of all relevant types of diagnostic devices as BPM’s, ACCT’s, SEM grids, a slit-grid emittance device and a bunch shape monitor. Moreover, a magnetic spectrometer is supposed to measure the energy spread of the proton beam. Point-to-point imaging is foreseen to enable high energy resolution independently on the transverse emittance. Due to the limited space in the accelerator tunnel a special design must be chosen with the inclusion of quadrupole magnets. The present contribution gives an overall presentation of the test bench and its devices with a special emphasis on the magnetic spectrometer design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP038
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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MOPP042	Beam Diagnostics for the Multi-MW High Energy Beam Transport Line of DONES	target, beam-diagnostic, radiation, linac	200
	I. Podadera, A. Ibarra, D. Jiménez-Rey, J. Mollá, C. Oliver, R. Varela, V. Villamayor CIEMAT, Madrid, Spain O. Nomen, D. Sánchez-Herranz IREC, Sant Adria del Besos, Spain
	Funding: Work carried out within the framework of the EUROfusion Consortium and funded from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053. In the frame of the material research for future fusion reactors, the construction of a simplified version of the IFMIF plant, the so-called DONES (Demo-Oriented Neutron Early Source), is under preparatory phase to allow materials testing with sufficient radiation damage for the new design of DEMO. The DONES accelerator system will deliver a deuteron beam at 40 MeV, 125 mA. The 5 MW beam will impact onto a lithium flow target to form an intense neutron source. One of the most critical tasks of the accelerator is the beam diagnostics along high energy beam transport, especially in the high radiation areas close to the lithium target. This instrumentation is essential to provide the relevant data for ensuring the high availability of the whole accelerator system, the beam characteristics and machine protection. Of outmost importance is the control of the beam characteristics impinging on the lithium curtain. Several challenging diagnostics are being designed and tested for that purpose. This contribution will report the present status of the design of the beam diagnostics, focusing on the high radiation areas of the high energy beam transport line.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP042
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUBO01	Screens for High Precision Measurements	electron, radiation, beam-diagnostic, detector	242
	B. Walasek-Höhne, P. Forck GSI, Darmstadt, Germany K. Hoehne FAIR, Darmstadt, Germany R. Ischebeck PSI, Villigen PSI, Switzerland G. Kube DESY, Hamburg, Germany
	Funding: This project has received funding from the European Union¿s Horizon 2020 programme under Grant Agreement No 730871. Scintillation screens made of various inorganic materials are widely used for transverse beam profile diagnostics at all kinds of accelerators. The monitor principle is based on the particles¿ energy loss and its conversion to visible light. The resulting light spot is a direct image of the two-dimensional beam distribution. For large beam sizes standard optical techniques can be applied, while for small beam sizes dedicated optical arrangements have to be used to prevent for image deformations. In the modern linac based light sources scintillator usage serves as an alternative way to overcome limitations related to coherent OTR emission. Radiation damages and intensity based saturation effects, in dependence of the screen material, have to be modelled. In this talk, an introduction to the scintillation mechanism in inorganic materials will be given including practical demands and limitations. An overview on actual applications at hadron and electron accelerators will be discussed as summary of the Joint ARIES-ADA Workshop on ¿Scintillation Screens and Optical Technology for transverse Profile Measurements¿ held in Kraków, Poland.
	Slides TUBO01 [27.172 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUBO01
About •	paper received ※ 09 September 2019 paper accepted ※ 16 November 2019 issue date ※ 10 November 2019
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TUPP003	A Common Diagnostic Platform for Elettra 2.0 and FERMI	cavity, FPGA, controls, Ethernet	280
	G. Brajnik, S. Cleva, R. De Monte, D. Giuressi Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Elettra 2.0 is the project of upgrading the current synchrotron light source to a low emittance machine. In this framework, various components of diagnostics have to be refurbished due to the obsolescence of the same or due to the tight requirements of the new accelerator. In this paper we present a high performance FPGA-based (Altera/Intel Arria 10) digital board developed internally, capable of hosting two FMC modules, equipped with DDR3 ram and 10 Gb/s Ethernet links. The presence of the FMC connectors allows a flexible use of the board: various configurations of A/D and D/A converters (different number of channels, resolution, sampling rate) can be obtained, also with various I/O ports for trigger and synchronisation. These features make it applicable as a base platform for various applications not only for Elettra (electron and photon BPMs, DLLRF systems, etc.) but also for Fermi (cavity BPMs, bunch arrival monitor, link stabiliser). The peripherals on board have been fully debugged, and probably a new version with a SoC (System on Chip) will be released in the next future.
	Poster TUPP003 [1.586 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP003
About •	paper received ※ 02 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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TUPP011	Observation of Scintillators Charging Effects at the European XFEL	FEL, electron, free-electron-laser, operation	308
	A.I. Novokshonov, B. Beutner, G. Kube DESY, Hamburg, Germany S.A. Strokov TPU, Tomsk, Russia
	Scintillating screens are widely used for beam profile diagnostics at various kinds of particle accelerators. At modern linac based electron machines with ultrashort bunches as the European XFEL in Hamburg (Germany), scintillators help to overcome the limitation of standard OTR based monitors imposed by the emission of coherent radiation. The XFEL injector section is equipped with four off-axis screens allowing to perform online beam profile diagnostics, i.e. a single bunch out of a bunch train is kicked onto the screen and the profile is analyzed. However, during user operation a decrease of the SASE level was observed in cases that one of the of-axis screens was used. The observation is explained by charging of the scintillator screen: each deflected bunch hitting the screens causes ionization and charging of the screen. The scintillator as good insulator keeps the charge for some time such that the non-deflected part of the bunch-train feels their Coulomb force and experiences a kick, resulting in a drop of the SASE level. This report summarizes the observations at the European XFEL and introduces a simple model for quantification of this effect.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP011
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUPP015	Wire Scanner Diagnostic System	controls, software, ion-source, hardware	326
	S. Grulja, S. Cleva, R. De Monte, M. Ferianis Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Elettra Sincrotrone Trieste Research Center (Elettra) is one of the Italian Institutions, together with Istituto Nazionale di Fisica Nucleare (INFN) and Consiglio Nazionale delle Ricerche (CNR), committed to the realization of the Italian in-kind contributions for the European Spallation Source. One part of the Elettra in-kind contributions to the proton accelerator is the construction of acquisition system for ESS Wire Scanner (WS).This paper presents an overview of the diagnostic system of the ESS Wire Scanner, including the first measurements with beam performed at CERN on LINAC4.
	Poster TUPP015 [7.121 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP015
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUPP026	Diagnostic Beamlines at the Solaris Storage Ring	storage-ring, emittance, synchrotron, electron	366
	A. Kisiel, S. Cabala, A.M. Marendziak, M. Ptaszkiewicz, A.I. Wawrzyniak, I.S. Zadworny, Z. Zbylut NSRC SOLARIS, Kraków, Poland
	Precise measurement and control of the particle beam emittance is a very important input to characterize the performance of any accelerator/SRS. Beam characterizations at the SOLARIS National Synchrotron Radiation Centre are provided by two independent diagnostic beamlines called the X-ray synchrotron radiation (PINHOLE) and optical synchrotron radiation (LUMOS) beamlines, respectively. The PINHOLE beamline depicts the electron beam by analyzing the emitted X-rays. However this method is predominantly applied to the middle and high energy storage rings. At Solaris storage ring with the nominal energy of 1.5 GeV and critical photon beam energy of c.a. 2 keV, the design of the beamline was modified to provide sufficient X-ray photon flux for proper imaging. Second diagnostic beamline LUMOS will be installed and commissioned in next few months. Issues discussed include the general design philosophy, choice of instrumentation, limits to resolution, and actual performance. *e-mail: adriana.wawrzyniak@uj.edu.pl
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP026
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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TUPP040	Digital Cameras for Photon Diagnostics at the Advanced Photon Source	controls, damping, injection, detector	425
	K.P. Wootton, N.D. Arnold, W. Berg, T. Fors, N. Sereno, H. Shang, G. Shen, S.E. Shoaf, B.X. Yang ANL, Lemont, Illinois, USA
	Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Cameras can be a very useful accelerator diagnostic, particularly because an image of the beam distribution can be quickly interpreted by human operators, and increasingly can serve as an input to machine learning algorithms. We present an implementation of digital cameras for triggered photon diagnostics at the Advanced Photon Source using the areaDetector framework in the Experimental Physics and Industrial Controls System. Beam size measurements from the synchrotron light monitors in the Particle Accumulator Ring using the new architecture are presented.
	Poster TUPP040 [0.708 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP040
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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TUPP043	Fast and Robust Wire Scanners with Novel Materials for Profiling High Intensity Beams	operation, controls, detector, laser	436
	G. Andonian, T.J. Campese, A. Laurich, M. Ruelas RadiaBeam, Marina del Rey, California, USA G. Andonian, J.K. Penney UCLA, Los Angeles, California, USA J. Gubeli, K. Jordan, J. Yan JLab, Newport News, Virginia, USA C.F. Huff, L.R. Scammell, R.R. Whitney BNNT, LLC, Newport News, USA
	Wire scanners are robust devices for beam characterization in accelerator facilities. However, prolonged usage with intense particle beams leads to wire damage, requiring replacement and beam diagnostic downtime. The fast, robust wire scanner was recently designed and engineered with swappable and modular wire cards, that can accommodate different wire materials under tension. Testing is currently underway at the Jefferson Laboratory (JLab) Low Energy Recirculating Facility. During the course of the diagnostic development and commissioning, we will test Tungsten, Carbon, and boron-nitride nanotube in wire form. The latter is particularly relevant as early results on the material show that it has very high thermal thresholds and may withstand the high-power of the beam during regular operations. This paper will report on the system design and engineering, and preliminary results with operation on the beamline.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP043
About •	paper received ※ 05 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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WEPP037	First Measurements of Cherenkov-Diffraction Radiation at Diamond Light Source	radiation, photon, electron, experiment	624
	D.M. Harryman, P. Karataev JAI, Egham, Surrey, United Kingdom M. Apollonio, L. Bobb DLS, Oxfordshire, United Kingdom M. Bergamaschi, R. Kieffer, M. Krupa, T. Lefèvre, S. Mazzoni CERN, Geneva, Switzerland A. Potylitsyn TPU, Tomsk, Russia
	Cherenkov Diffraction Radiation (ChDR), appearing when a charged particle moves in the vicinity of a dielectric medium with speed faster than the speed of light inside the medium, is a phenomenon that can be exploited for a range of non-invasive beam diagnostics. By using dielectric radiators that emit photons when in proximity to charged particle beams, one can design devices to measure beam properties such as position, direction and size. The Booster To Storage-ring (BTS) test stand at Diamond Light Source provides a 3 GeV electron beam for diagnostics research. A new vessel string has been installed to allow the BTS test stand to be used to study ChDR diagnostics applicable for both hadron and electron accelerators. This paper will discuss the commissioning of the BTS test stand, as well as exploring the initial results obtained from the ChDR monitor.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP037
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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WEPP039	Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers	laser, electron, radiation, bunching	633
	A.H. Lumpkin Fermilab, Batavia, Illinois, USA D.W. Rule Private Address, Silver Spring, USA
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The need for single-shot diagnostics of the periodic longitudinal density modulation of relativistic electrons at the resonant wavelength (microbunching) in a free-electron laser (FEL) or at broadband visible wavelengths as in a laser-driven plasma accelerator (LPA) has been reaffirmed. In the self-amplified spontaneous emission (SASE) FEL case, statistical fluctuations in the microbunching occur in the startup-from-noise process. In the LPA, the plasma itself is chaotic and varies shot to shot. Fortunately, we have shown that coherent optical transition radiation (COTR) techniques, can assess beam size, divergence, spectral evolution, and z-dependent gain (100, 000) of microbunched electrons in a past SASE FEL experiment at 530 nm. Recently, the application to LPAs has been demonstrated with single-shot near-field (NF) and far-field (FF) COTR imaging done at the exit of an LPA for the first time. In this case few-micron beam sizes and extensive fringes due to sub-mrad divergences were measured based on point-spread-function effects and an analytical model for COTR interferometry, respectively. A proposed diagnostics application at 266 nm to pre-bunched beams is also described. A.H. Lumpkin et al., Phys. Rev. Lett. 88, No.23, 234801 (2002). **A.H. Lumpkin, M. LaBerge, D.W. Rule, et al., Proceedings of AAC18, (IEEE), 2019.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP039
About •	paper received ※ 10 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019
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WEPP045	Development of an Automated BPM Test Bench	controls, linac, instrumentation, beam-diagnostic	651
	M. Schwarz, H. Podlech IAP, Frankfurt am Main, Germany H. Höltermann, B. Koubek, U. Ratzinger, W. Schweizer, D. Strehl, C. Trageser BEVATECH, Frankfurt, Germany
	The Institute for Applied Physics (IAP) of Goethe University Frankfurt has a long history in developing DTL-cavities and further essential components of particle accelerators from design and simulation up to tuning and final testing. In recent times, the development of beam diagnostic components for the hadron accelerator projects has become increasingly important. Bevatech is designing and setting up linear accelerators, RF and vacuum technology for research laboratories and enterprises worldwide. In a joint effort a simple, efficient and mobile beam position monitor (BPM) test bench has been developed and will be further improved for future tests and the calibration of beam position monitors. It is fully automated using single-board computers and microcontrollers to obtain the essential calibration data like electrical offset, button sensitivity and the 2D response map. In addition, initial tests with the implementation and evaluation of the Libera signal processing units Single Pass H and Spark were promising.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP045
About •	paper received ※ 03 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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THAO01	Cherenkov Diffraction Radiation as a tool for beam diagnostics	radiation, electron, photon, experiment	660
	T. Lefèvre, D. Alves, M. Bergamaschi, A. Curcio, O.R. Jones, R. Kieffer, S. Mazzoni, N. Mounet, A. Schlogelhofer, E. Senes CERN, Meyrin, Switzerland M. Apollonio, L. Bobb DLS, Oxfordshire, United Kingdom A. Aryshev, N. Terunuma KEK, Ibaraki, Japan M.G. Billing, Y.L. Bordlemay Padilla, J.V. Conway, J.P. Shanks Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA V.V. Bleko, S.Yu. Gogolev, A.S. Konkov, J.S. Markova, A. Potylitsyn, D.A. Shkitov TPU, Tomsk, Russia K.V. Fedorov, D.M. Harryman, P. Karataev, K. Lekomtsev JAI, Egham, Surrey, United Kingdom J. Gardelle CEA, LE BARP cedex, France K. Łasocha Jagiellonian University, Kraków, Poland
	During the last three years, the emission of Cherenkov Diffraction Radiation (ChDR), appearing when a relativistic charged particle moves in the vicinity of a dielectric medium, has been investigated with the aim of providing non-invasive beam diagnostics. ChDR has very interesting properties, with a large number of photons emitted in a narrow and well-defined solid angle, providing excellent conditions for detection with very little background. This contribution will present a collection of recent beam measurements performed at several facilities such as the Cornell Electron Storage Ring, the Advanced Test Facility 2 at KEK, the Diamond light source in the UK and the CLEAR test facility at CERN. Those results, complemented with simulations, suggest that the use of both incoherent and coherent emission of Cherenkov diffraction radiation could open up new beam instrumentation possibilities for relativistic charged particle beams.
	Slides THAO01 [10.658 MB]
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THBO01	Machine Learning-Based Longitudinal Phase Space Prediction of Two-Bunch Operation at FACET-II	simulation, operation, experiment, linac	679
	C. Emma, M.D. Alverson, A.L. Edelen, M.J. Hogan, B.D. O’Shea, D.W. Storey, G.R. White, V. Yakimenko SLAC, Menlo Park, California, USA A. Hanuka Technion, Haifa, Israel
	Funding: This work was supported by the U.S. Department of Energy under Contract No. DEAC02-76SF00515 We report on the application of machine learning (ML) methods for predicting the longitudinal phase space (LPS) distribution of particle accelerators. Our approach consists of training a ML-based virtual diagnostic to predict the LPS using only nondestructive linac and e-beam measurements as inputs. We validate this approach with a simulation study for the FACET-II linac and with an experimental demonstration conducted at LCLS. At LCLS, the e-beam LPS images are obtained with a transverse deflecting cavity and used as training data for our ML model. In both the FACET-II and LCLS cases we find good agreement between the predicted and simulated/measured LPS profiles, an important step towards showing the feasibility of implementing such a virtual diagnostic on particle accelerators in the future. References: * C. Emma, A. Edelen, M. J. Hogan, B. O¿Shea, G. White, and V. Yakimenko., PRAB 21, 112802 (2018) ** A. Scheinker, A. Edelen, D. Bohler, C. Emma, A. Lutman., PRL 121, 044801 (2018)
	Slides THBO01 [9.917 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THBO01
About •	paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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Paper

Title

Other Keywords

Page

MOAO03

Overview on the Diagnostics for EBS-ESRF

storage-ring, feedback, SRF, radiation

9

L. Torino, N. Benoist, F. Ewald, E. Plouviez, J. Poitou, B. Roche, K.B. Scheidt, F. Taoutaou, F. Uberto
ESRF, Grenoble, France

On December 2018 the ESRF was shut down and the 28 years old storage ring was entirely dismantled in the following months. A new storage ring, the Extremely Brilliant Source (EBS), that had been pre-assembled in 2017 and 2018, is presently being installed and the commissioning will start in December 2019. EBS will achieve a much reduced horizontal emittance, from 4 nm to 150 pm, and will also provide the X-ray users with a more coherent synchrotron radiation beam. In this paper, we present an overview of the diagnostics systems for this new storage ring.

Slides MOAO03 [40.660 MB]

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MOCO03

Estimation of Longitudinal Profiles of Ion Bunches in the LHC Using Schottky-Based Diagnostics

synchrotron, distributed, experiment, hadron

45

K. Łasocha, D. Alves
CERN, Meyrin, Switzerland

The Large Hadron Collider (LHC) Schottky monitors have been designed to measure various parameters of relevance to beam quality, namely tune, momentum spread and chromaticity. We present another application of this instrument - the evaluation of longitudinal bunch profiles. The relation between the distribution of synchrotron amplitudes within the bunch population and the longitudinal bunch profile is derived from probabilistic principles. Our approach, limited to bunched beams with no intra-bunch coherent motion, initially fits the cumulative power spectral density of acquired Schottky spectra with the underlying distribution of synchrotron amplitudes. The result of this fit is then used to reconstruct the bunch profile using the derived model. The results obtained are verified by a comparison with measurements from the LHC Wall Current Monitors.

Slides MOCO03 [48.066 MB]

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MOCO04

Overview of Bunch-Resolved Diagnostics for the Future BESSY VSR Electron-Storage Ring

electron, timing, operation, storage-ring

50

G. Schiwietz, J.G. Hwang, M. Koopmans, M. Ries
HZB, Berlin, Germany

The upgrade of the BESSY II light source in Berlin towards the Variable pulse-length Storage-Ring BESSY VSR will lead to a complex fill pattern. This involves co-existing electron bunches with significant variations of bunch-length, bunch charge as well as charge density. Among many other boundary conditions, this calls for bunch resolved measurements with sub-ps time resolution and micrometer spatial resolution. Currently, we are constructing a diagnostic platform connected to three new dipole beamlines for visible light as well as THz measurements. The mid-term aim is a 24/7 use of beam-diagnostic tools and the development of advanced methods for specific purposes. Recently, we have set-up a sub-ps streak camera* and we are investigating other innovative methods for bunch-length** as well as lateral size determination using visible light*** at the first of our new diagnostic dipole beamlines. Preliminary results as well as our concepts for achieving high sensitivity, good signal-to-noise ratio and time resolution will be presented and discussed at the conference.
* G.Schiwietz et al., J.Phys.:Conf. Series 1067, 072005 (2018)
** T.Mitsuhashi, M.Tadano, Proc. of EPAC¿02, Paris, France, p. 1936
*** J.Breunlin et al., NIM- A803, pp.55 (2015) &refs. therein

Slides MOCO04 [10.924 MB]

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MOPP013

Faraday Cup Selector for DC-280 Cyclotron

controls, cyclotron, beam-transport, ECR

103

V.V. Aleinikov, S. Pachtchenko
JINR, Dubna, Moscow Region, Russia
K.P. Sychev, V. Zabanova
JINR/FLNR, Moscow region, Russia

New isochronous cyclotron DC-280, the basic facility of Super Heavy Element (SHE) factory was put into operation in the FLNR JINR on March 25, 2019. Key role in beam diagnostics for lossless transportation is played by Faraday cups. Five elements were installed along the two injection lines, and 12 elements on the five transport channels to the experimental facilities. The software was developed to automatically select the active Faraday cup depending on its location and track the current on a single indicator. This paper describes basic principles and algorithm of the Faraday cup Selector module which is a part of the DC-280 cyclotron control system.

Poster MOPP013 [2.214 MB]

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paper received ※ 27 August 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

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MOPP035

Electron Beam Diagnostics Concept for the LWFA Driven FEL at ELI-Beamlines

electron, FEL, cavity, plasma

184

K.O. Kruchinin, D. Kocon, A.Y. Molodozhentsev
ELI-BEAMS, Prague, Czech Republic
A. Lyapin
JAI, Egham, Surrey, United Kingdom

Uniquely short high energy electron bunches produced by compact Laser Wakefield Accelerators (LWFA) are attractive for the development of new generation Free Electron Lasers (FEL). Although the beam quality of LWFA is still significantly lower than provided by conventional accelerators, with persistent progress seen in the area of laser plasma acceleration, they have a great potential to be considered the new generation drivers for FELs and even colliders. A new LWFA based FEL project called "LUIS" is currently being commissioned at ELI-beamlines in Czech Republic. LUIS aims to demonstrate a stable generation of X-ray photons with a wavelengths of 6 nm and lower, suitable for user applications. Electron beam diagnostics are absolutely crucial for achieving LUIS’s aims. Low charge, poor beam stability and other beam properties inherent for a LWFA require rethinking and adaptation of the conventional diagnostic tools and, in some cases, development of new ones. In this paper we provide an overview of the electron beam instrumentation in LUIS with a focus on the current challenges and some discussion of the foreseen future developments.

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MOPP036

SPIRAL2 Diagnostic Qualifications with RFQ beams

rfq, linac, emittance, MEBT

188

C. Jamet, T. Andre, V. Langlois, T. Le Ster, G. Ledu, P. Legallois, S. Leloir, F. Lepoittevin, S. Loret, C. Potier de courcy, R.V. Revenko
GANIL, Caen, France

The SPIRAL2 accelerator, built on the GANIL’s facility, at CAEN in FRANCE is dedicated to accelerate light and heavy ion beams up to 5mA and 40 MeV. The continuous wave accelerator is based on two ECR ion sources, a RFQ and a superconducting LINAC. The beam commissioning of the RFQ finished at the end of 2018. This paper presents the Diagnostic-Plate installed behind the RFQ, with all associated accelerator diagnostics. Diagnostic monitors, measured beam parameters, results are described and analyzed. A brief presentation of the next steps is given.

Poster MOPP036 [1.558 MB]

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MOPP037

Status of Beam Instrumentation for FAIR HEBT

detector, proton, electron, antiproton

193

M. Schwickert, P. Boutachkov, T. Hoffmann, H. Reeg, A. Reiter, B. Walasek-Höhne
GSI, Darmstadt, Germany

At present the Facility for Antiproton and Ion Research (FAIR) is under construction at the GSI site. As part of the FAIR project the beamlines of the High Energy Beam Transport (HEBT) section interconnect the synchrotrons, storage rings and experimental caves. The large range of beam energies (MeV to GeV) and beam intensities up to 10¹² particles per pulse for uranium, or up to 2·10¹³ particles per pulse for protons, demand in many cases for purpose-built beam diagnostic devices. Presently, the main diagnostic components are being manufactured by international in-kind partners in close collaboration with GSI. This contribution presents an overview of the beam instrumentation layout of the FAIR HEBT and summa-rizes the present status of developments for HEBT beam diagnostics. We focus on the status of the foreseen beam current transformers, particle detectors, scintillating screens and profile grids.

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MOPP038

The Beam Diagnostics Test Bench for the Commissioning of the Proton Linac at FAIR

linac, proton, dipole, quadrupole

196

S. Udrea, P. Forck, C.M. Kleffner, K. Knie, T. Sieber
GSI, Darmstadt, Germany

A dedicated proton injector for FAIR (the pLinac) is presently under construction at GSI Darmstadt. This accelerator is designed to deliver a beam current of up to 70 mA with a final energy of 68 MeV for the FAIR anti-proton program. For the commissioning of the pLinac a movable beam diagnostics test bench will be used to characterize the proton beam at different locations during the stepwise installation. The test bench will consist of all relevant types of diagnostic devices as BPM’s, ACCT’s, SEM grids, a slit-grid emittance device and a bunch shape monitor. Moreover, a magnetic spectrometer is supposed to measure the energy spread of the proton beam. Point-to-point imaging is foreseen to enable high energy resolution independently on the transverse emittance. Due to the limited space in the accelerator tunnel a special design must be chosen with the inclusion of quadrupole magnets. The present contribution gives an overall presentation of the test bench and its devices with a special emphasis on the magnetic spectrometer design.

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MOPP042

Beam Diagnostics for the Multi-MW High Energy Beam Transport Line of DONES

target, beam-diagnostic, radiation, linac

200

I. Podadera, A. Ibarra, D. Jiménez-Rey, J. Mollá, C. Oliver, R. Varela, V. Villamayor
CIEMAT, Madrid, Spain
O. Nomen, D. Sánchez-Herranz
IREC, Sant Adria del Besos, Spain

Funding: Work carried out within the framework of the EUROfusion Consortium and funded from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053.
In the frame of the material research for future fusion reactors, the construction of a simplified version of the IFMIF plant, the so-called DONES (Demo-Oriented Neutron Early Source), is under preparatory phase to allow materials testing with sufficient radiation damage for the new design of DEMO. The DONES accelerator system will deliver a deuteron beam at 40 MeV, 125 mA. The 5 MW beam will impact onto a lithium flow target to form an intense neutron source. One of the most critical tasks of the accelerator is the beam diagnostics along high energy beam transport, especially in the high radiation areas close to the lithium target. This instrumentation is essential to provide the relevant data for ensuring the high availability of the whole accelerator system, the beam characteristics and machine protection. Of outmost importance is the control of the beam characteristics impinging on the lithium curtain. Several challenging diagnostics are being designed and tested for that purpose. This contribution will report the present status of the design of the beam diagnostics, focusing on the high radiation areas of the high energy beam transport line.

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TUBO01

Screens for High Precision Measurements

electron, radiation, beam-diagnostic, detector

242

B. Walasek-Höhne, P. Forck
GSI, Darmstadt, Germany
K. Hoehne
FAIR, Darmstadt, Germany
R. Ischebeck
PSI, Villigen PSI, Switzerland
G. Kube
DESY, Hamburg, Germany

Funding: This project has received funding from the European Union¿s Horizon 2020 programme under Grant Agreement No 730871.
Scintillation screens made of various inorganic materials are widely used for transverse beam profile diagnostics at all kinds of accelerators. The monitor principle is based on the particles¿ energy loss and its conversion to visible light. The resulting light spot is a direct image of the two-dimensional beam distribution. For large beam sizes standard optical techniques can be applied, while for small beam sizes dedicated optical arrangements have to be used to prevent for image deformations. In the modern linac based light sources scintillator usage serves as an alternative way to overcome limitations related to coherent OTR emission. Radiation damages and intensity based saturation effects, in dependence of the screen material, have to be modelled. In this talk, an introduction to the scintillation mechanism in inorganic materials will be given including practical demands and limitations. An overview on actual applications at hadron and electron accelerators will be discussed as summary of the Joint ARIES-ADA Workshop on ¿Scintillation Screens and Optical Technology for transverse Profile Measurements¿ held in Kraków, Poland.

Slides TUBO01 [27.172 MB]

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paper received ※ 09 September 2019 paper accepted ※ 16 November 2019 issue date ※ 10 November 2019

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TUPP003

A Common Diagnostic Platform for Elettra 2.0 and FERMI

cavity, FPGA, controls, Ethernet

280

G. Brajnik, S. Cleva, R. De Monte, D. Giuressi
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Elettra 2.0 is the project of upgrading the current synchrotron light source to a low emittance machine. In this framework, various components of diagnostics have to be refurbished due to the obsolescence of the same or due to the tight requirements of the new accelerator. In this paper we present a high performance FPGA-based (Altera/Intel Arria 10) digital board developed internally, capable of hosting two FMC modules, equipped with DDR3 ram and 10 Gb/s Ethernet links. The presence of the FMC connectors allows a flexible use of the board: various configurations of A/D and D/A converters (different number of channels, resolution, sampling rate) can be obtained, also with various I/O ports for trigger and synchronisation. These features make it applicable as a base platform for various applications not only for Elettra (electron and photon BPMs, DLLRF systems, etc.) but also for Fermi (cavity BPMs, bunch arrival monitor, link stabiliser). The peripherals on board have been fully debugged, and probably a new version with a SoC (System on Chip) will be released in the next future.

Poster TUPP003 [1.586 MB]

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paper received ※ 02 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

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TUPP011

Observation of Scintillators Charging Effects at the European XFEL

FEL, electron, free-electron-laser, operation

308

A.I. Novokshonov, B. Beutner, G. Kube
DESY, Hamburg, Germany
S.A. Strokov
TPU, Tomsk, Russia

Scintillating screens are widely used for beam profile diagnostics at various kinds of particle accelerators. At modern linac based electron machines with ultrashort bunches as the European XFEL in Hamburg (Germany), scintillators help to overcome the limitation of standard OTR based monitors imposed by the emission of coherent radiation. The XFEL injector section is equipped with four off-axis screens allowing to perform online beam profile diagnostics, i.e. a single bunch out of a bunch train is kicked onto the screen and the profile is analyzed. However, during user operation a decrease of the SASE level was observed in cases that one of the of-axis screens was used. The observation is explained by charging of the scintillator screen: each deflected bunch hitting the screens causes ionization and charging of the screen. The scintillator as good insulator keeps the charge for some time such that the non-deflected part of the bunch-train feels their Coulomb force and experiences a kick, resulting in a drop of the SASE level. This report summarizes the observations at the European XFEL and introduces a simple model for quantification of this effect.

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TUPP015

Wire Scanner Diagnostic System

controls, software, ion-source, hardware

326

S. Grulja, S. Cleva, R. De Monte, M. Ferianis
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Elettra Sincrotrone Trieste Research Center (Elettra) is one of the Italian Institutions, together with Istituto Nazionale di Fisica Nucleare (INFN) and Consiglio Nazionale delle Ricerche (CNR), committed to the realization of the Italian in-kind contributions for the European Spallation Source. One part of the Elettra in-kind contributions to the proton accelerator is the construction of acquisition system for ESS Wire Scanner (WS).This paper presents an overview of the diagnostic system of the ESS Wire Scanner, including the first measurements with beam performed at CERN on LINAC4.

Poster TUPP015 [7.121 MB]

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TUPP026

Diagnostic Beamlines at the Solaris Storage Ring

storage-ring, emittance, synchrotron, electron

366

A. Kisiel, S. Cabala, A.M. Marendziak, M. Ptaszkiewicz, A.I. Wawrzyniak, I.S. Zadworny, Z. Zbylut
NSRC SOLARIS, Kraków, Poland

Precise measurement and control of the particle beam emittance is a very important input to characterize the performance of any accelerator/SRS. Beam characterizations at the SOLARIS National Synchrotron Radiation Centre are provided by two independent diagnostic beamlines called the X-ray synchrotron radiation (PINHOLE) and optical synchrotron radiation (LUMOS) beamlines, respectively. The PINHOLE beamline depicts the electron beam by analyzing the emitted X-rays. However this method is predominantly applied to the middle and high energy storage rings. At Solaris storage ring with the nominal energy of 1.5 GeV and critical photon beam energy of c.a. 2 keV, the design of the beamline was modified to provide sufficient X-ray photon flux for proper imaging. Second diagnostic beamline LUMOS will be installed and commissioned in next few months. Issues discussed include the general design philosophy, choice of instrumentation, limits to resolution, and actual performance.
*e-mail: adriana.wawrzyniak@uj.edu.pl

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TUPP040

Digital Cameras for Photon Diagnostics at the Advanced Photon Source

controls, damping, injection, detector

425

K.P. Wootton, N.D. Arnold, W. Berg, T. Fors, N. Sereno, H. Shang, G. Shen, S.E. Shoaf, B.X. Yang
ANL, Lemont, Illinois, USA

Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Cameras can be a very useful accelerator diagnostic, particularly because an image of the beam distribution can be quickly interpreted by human operators, and increasingly can serve as an input to machine learning algorithms. We present an implementation of digital cameras for triggered photon diagnostics at the Advanced Photon Source using the areaDetector framework in the Experimental Physics and Industrial Controls System. Beam size measurements from the synchrotron light monitors in the Particle Accumulator Ring using the new architecture are presented.

Poster TUPP040 [0.708 MB]

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TUPP043

Fast and Robust Wire Scanners with Novel Materials for Profiling High Intensity Beams

operation, controls, detector, laser

436

G. Andonian, T.J. Campese, A. Laurich, M. Ruelas
RadiaBeam, Marina del Rey, California, USA
G. Andonian, J.K. Penney
UCLA, Los Angeles, California, USA
J. Gubeli, K. Jordan, J. Yan
JLab, Newport News, Virginia, USA
C.F. Huff, L.R. Scammell, R.R. Whitney
BNNT, LLC, Newport News, USA

Wire scanners are robust devices for beam characterization in accelerator facilities. However, prolonged usage with intense particle beams leads to wire damage, requiring replacement and beam diagnostic downtime. The fast, robust wire scanner was recently designed and engineered with swappable and modular wire cards, that can accommodate different wire materials under tension. Testing is currently underway at the Jefferson Laboratory (JLab) Low Energy Recirculating Facility. During the course of the diagnostic development and commissioning, we will test Tungsten, Carbon, and boron-nitride nanotube in wire form. The latter is particularly relevant as early results on the material show that it has very high thermal thresholds and may withstand the high-power of the beam during regular operations. This paper will report on the system design and engineering, and preliminary results with operation on the beamline.

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WEPP037

First Measurements of Cherenkov-Diffraction Radiation at Diamond Light Source

radiation, photon, electron, experiment

624

D.M. Harryman, P. Karataev
JAI, Egham, Surrey, United Kingdom
M. Apollonio, L. Bobb
DLS, Oxfordshire, United Kingdom
M. Bergamaschi, R. Kieffer, M. Krupa, T. Lefèvre, S. Mazzoni
CERN, Geneva, Switzerland
A. Potylitsyn
TPU, Tomsk, Russia

Cherenkov Diffraction Radiation (ChDR), appearing when a charged particle moves in the vicinity of a dielectric medium with speed faster than the speed of light inside the medium, is a phenomenon that can be exploited for a range of non-invasive beam diagnostics. By using dielectric radiators that emit photons when in proximity to charged particle beams, one can design devices to measure beam properties such as position, direction and size. The Booster To Storage-ring (BTS) test stand at Diamond Light Source provides a 3 GeV electron beam for diagnostics research. A new vessel string has been installed to allow the BTS test stand to be used to study ChDR diagnostics applicable for both hadron and electron accelerators. This paper will discuss the commissioning of the BTS test stand, as well as exploring the initial results obtained from the ChDR monitor.

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WEPP039

Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers

laser, electron, radiation, bunching

633

A.H. Lumpkin
Fermilab, Batavia, Illinois, USA
D.W. Rule
Private Address, Silver Spring, USA

Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
The need for single-shot diagnostics of the periodic longitudinal density modulation of relativistic electrons at the resonant wavelength (microbunching) in a free-electron laser (FEL) or at broadband visible wavelengths as in a laser-driven plasma accelerator (LPA) has been reaffirmed. In the self-amplified spontaneous emission (SASE) FEL case, statistical fluctuations in the microbunching occur in the startup-from-noise process. In the LPA, the plasma itself is chaotic and varies shot to shot. Fortunately, we have shown that coherent optical transition radiation (COTR) techniques, can assess beam size, divergence, spectral evolution, and z-dependent gain (100, 000) of microbunched electrons in a past SASE FEL experiment at 530 nm*. Recently, the application to LPAs has been demonstrated with single-shot near-field (NF) and far-field (FF) COTR imaging done at the exit of an LPA for the first time**. In this case few-micron beam sizes and extensive fringes due to sub-mrad divergences were measured based on point-spread-function effects and an analytical model for COTR interferometry, respectively. A proposed diagnostics application at 266 nm to pre-bunched beams is also described.
*A.H. Lumpkin et al., Phys. Rev. Lett. 88, No.23, 234801 (2002).
**A.H. Lumpkin, M. LaBerge, D.W. Rule, et al., Proceedings of AAC18, (IEEE), 2019.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP039

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paper received ※ 10 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019

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WEPP045

Development of an Automated BPM Test Bench

controls, linac, instrumentation, beam-diagnostic

651

M. Schwarz, H. Podlech
IAP, Frankfurt am Main, Germany
H. Höltermann, B. Koubek, U. Ratzinger, W. Schweizer, D. Strehl, C. Trageser
BEVATECH, Frankfurt, Germany

The Institute for Applied Physics (IAP) of Goethe University Frankfurt has a long history in developing DTL-cavities and further essential components of particle accelerators from design and simulation up to tuning and final testing. In recent times, the development of beam diagnostic components for the hadron accelerator projects has become increasingly important. Bevatech is designing and setting up linear accelerators, RF and vacuum technology for research laboratories and enterprises worldwide. In a joint effort a simple, efficient and mobile beam position monitor (BPM) test bench has been developed and will be further improved for future tests and the calibration of beam position monitors. It is fully automated using single-board computers and microcontrollers to obtain the essential calibration data like electrical offset, button sensitivity and the 2D response map. In addition, initial tests with the implementation and evaluation of the Libera signal processing units Single Pass H and Spark were promising.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP045

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paper received ※ 03 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

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THAO01

Cherenkov Diffraction Radiation as a tool for beam diagnostics

radiation, electron, photon, experiment

660

T. Lefèvre, D. Alves, M. Bergamaschi, A. Curcio, O.R. Jones, R. Kieffer, S. Mazzoni, N. Mounet, A. Schlogelhofer, E. Senes
CERN, Meyrin, Switzerland
M. Apollonio, L. Bobb
DLS, Oxfordshire, United Kingdom
A. Aryshev, N. Terunuma
KEK, Ibaraki, Japan
M.G. Billing, Y.L. Bordlemay Padilla, J.V. Conway, J.P. Shanks
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
V.V. Bleko, S.Yu. Gogolev, A.S. Konkov, J.S. Markova, A. Potylitsyn, D.A. Shkitov
TPU, Tomsk, Russia
K.V. Fedorov, D.M. Harryman, P. Karataev, K. Lekomtsev
JAI, Egham, Surrey, United Kingdom
J. Gardelle
CEA, LE BARP cedex, France
K. Łasocha
Jagiellonian University, Kraków, Poland

During the last three years, the emission of Cherenkov Diffraction Radiation (ChDR), appearing when a relativistic charged particle moves in the vicinity of a dielectric medium, has been investigated with the aim of providing non-invasive beam diagnostics. ChDR has very interesting properties, with a large number of photons emitted in a narrow and well-defined solid angle, providing excellent conditions for detection with very little background. This contribution will present a collection of recent beam measurements performed at several facilities such as the Cornell Electron Storage Ring, the Advanced Test Facility 2 at KEK, the Diamond light source in the UK and the CLEAR test facility at CERN. Those results, complemented with simulations, suggest that the use of both incoherent and coherent emission of Cherenkov diffraction radiation could open up new beam instrumentation possibilities for relativistic charged particle beams.

Slides THAO01 [10.658 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO01

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paper received ※ 09 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

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THBO01

Machine Learning-Based Longitudinal Phase Space Prediction of Two-Bunch Operation at FACET-II

simulation, operation, experiment, linac

679

C. Emma, M.D. Alverson, A.L. Edelen, M.J. Hogan, B.D. O’Shea, D.W. Storey, G.R. White, V. Yakimenko
SLAC, Menlo Park, California, USA
A. Hanuka
Technion, Haifa, Israel

Funding: This work was supported by the U.S. Department of Energy under Contract No. DEAC02-76SF00515
We report on the application of machine learning (ML) methods for predicting the longitudinal phase space (LPS) distribution of particle accelerators. Our approach consists of training a ML-based virtual diagnostic to predict the LPS using only nondestructive linac and e-beam measurements as inputs. We validate this approach with a simulation study for the FACET-II linac and with an experimental demonstration conducted at LCLS. At LCLS, the e-beam LPS images are obtained with a transverse deflecting cavity and used as training data for our ML model. In both the FACET-II and LCLS cases we find good agreement between the predicted and simulated/measured LPS profiles, an important step towards showing the feasibility of implementing such a virtual diagnostic on particle accelerators in the future.
References:
* C. Emma, A. Edelen, M. J. Hogan, B. O¿Shea, G. White, and V. Yakimenko., PRAB 21, 112802 (2018)
** A. Scheinker, A. Edelen, D. Bohler, C. Emma, A. Lutman., PRL 121, 044801 (2018)

Slides THBO01 [9.917 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THBO01

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paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

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