IBIC2019 - List of Keywords (operation)

Paper	Title	Other Keywords	Page
MOBO04	Characterization and First Beam Loss Detection with One ESS-nBLM System Detector	neutron, detector, linac, proton	29
	L. Segui, H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, M. Combet, M. Kebbiri, Ph. Legou, O. Maillard, A. Marcel, T. Papaevangelou CEA-IRFU, Gif-sur-Yvette, France A. Dano-Daguze, D. Desforge, F. Gougnaud, T.J. Joannem, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, V. Nadot, G. Tsiledakis CEA-DRF-IRFU, France I. Dolenc Kittelmann, T.J. Shea ESS, Lund, Sweden
	The monitoring of losses is crucial in any accelerator. In the new high intensity hadron facilities even low energy beam can damage or activate the materials so the detection of small losses in this region is very important. A new type of neutron beam loss monitor has been developed specifically targeting this region, where only neutrons and photons can be produced and where typical BLM, based on charged particle detection, could not be appropriate because of the photon background due to the RF cavities. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and with little sensitivity to photons. Development of the detectors presented here has been done to fulfil the requirements of ESS and they will be part of the ESS-BI systems. The detector has been presented in previous editions of the conference. Here we focus on the neutron/gamma rejection with the final FEE and in the first operation of one of the modules in a beam during the commissioning of LINAC4 (CERN) with the detection of provoked losses and their clear separation from RF gammas. The ESS-nBLM system is presented in this conference in a separate contribution.
	Slides MOBO04 [7.609 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOBO04
About •	paper received ※ 05 September 2019 paper accepted ※ 09 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	diagnostics, electron, timing, 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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MOPP006	Commissioning of the Beam Loss Monitoring system for the HADES beam-line at GSI	detector, proton, simulation, heavy-ion	74
	P. Boutachkov, S. Damjanovic, M. Sapinski, B. Walasek-Höhne GSI, Darmstadt, Germany
	The High Acceptance Di-Electron Spectrometer experiments at GSI (HADES) require high-intensity heavy ion beams. Monitoring and minimization of the beam losses are critical for the operation at the desired beam intensities. FAIR-type Beam Loss Monitor (BLM) system based on sixteen plastic scintillator detectors is installed along the beam line from the SIS-18 synchrotron to the experiment location. The detectors are used in counting mode, with maximum counting rate of order of 20 MHz. The system has been commissioned during the 2018 beam time. Details on the detector setup, its calibration procedure and how it can be used for quantitative beam loss determination are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP006
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP007	Versatile Beamline Cryostat for the Cryogenic Current Comparator (CCC) for FAIR	cryogenics, resonance, vacuum, simulation	78
	D.M. Haider, F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker, F. Ucar GSI, Darmstadt, Germany H. De Gersem, N. Marsic, W.F.O. Müller TEMF, TU Darmstadt, Darmstadt, Germany J. Golm FSU Jena, Jena, Germany J. Golm, T. Koettig CERN, Meyrin, Switzerland M. Schmelz, R. Stolz, V. Zakosarenko IPHT, Jena, Germany T. Stöhlker IOQ, Jena, Germany T. Stöhlker, V. Tympel HIJ, Jena, Germany V. Zakosarenko Supracon AG, Jena, Germany
	Funding: Work supported by AVA - Accelerators Validating Antimatter the EU H₂020 Marie-Curie Action No. 721559 and by the BMBF under contract No. 05P15SJRBA and 5P18SJRB1. The Cryogenic Current Comparator (CCC) extends the measurement range of traditional non-destructive current monitors used in accelerator beamlines down to a few nano-amperes of direct beam current. This is achieved by a cryogenic environment of liquid helium around the beamline, in which the beam’s magnetic field is measured with a Superconducting Quantum Interference Device (SQUID), which is itself enclosed in a superconducting shielding structure. For this purpose, a versatile UHV-beamline cryostat was designed for the CCCs at FAIR and is currently in production. It is built for long-term autonomous operation with a closed helium re-liquefaction cycle and with good access to all inner components. The design is supported by simulations of the cryostat’s mechanical eigenmodes to minimize the excitation by vibrations in an accelerator environment. A prototype at GSI has demonstrated the self-contained cryogenic operation in combination with a 15 l/day re-liquefier. The cryostat will be used in CRYRING to compare the FAIR-CCC-X with newly developed CCC-types for 150 mm beamlines. Both which will supply a nA current reading during commissioning and for the experiments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP007
About •	paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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MOPP010	Design and Properties of a New DCCT Chamber for the PF-Ring at KEK	simulation, impedance, HOM, cavity	91
	R. Takai, T. Honda, T. Nogami, T. Obina, Y. Tanimoto KEK, Ibaraki, Japan
	A DC current transformer (DCCT) for the PF-ring was renewed during the 2018 summer shutdown. A vacuum chamber for the new DCCT was designed based on a circular duct with an inner diameter of 100 mm and has a structure housing a toroidal core inside of electromagnetic shields. The geometry of the ceramic break for interrupting the wall current flow was optimized using a three-dimensional electromagnetic field simulator, and the break was fabricated considering some technical limitations. Both ends of the ceramic break were short-circuited in a high-frequency manner by a sheet-like capacitive structure to suppress the radiation of unneeded higher-order modes (HOMs) into the core housing. The ceramic break is also equipped with water-cooling pipes on metal sleeves brazed to the both ends to efficiently remove the heat generated by HOMs. The new DCCT chamber has been used already in user operation without any problems. A temperature rise near the ceramic break is still approximately six degrees Celsius, even when a 50-mA isolated bunch is stored.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP010
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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MOPP014	Design of the ESS MEBT Faraday Cup	electron, radiation, MEBT, proton	106
	A. Rodríguez Páramo, I. Bustinduy, I. Mazkiaran, R. Miracoli, V. Toyos, S. Varnasseri, D. de Cos, C. de la Cruz ESS Bilbao, Zamudio, Spain E.M. Donegani, J.P.S. Martins ESS, Lund, Sweden
	The European Spallation Source (ESS) is currently under construction and the Medium Energy Beam Transfer (MEBT) is developed by ESS-Bilbao as an in-kind contribution. In the MEBT a set of diagnostics is included for beam characterization, among them the MEBT Faraday Cup is used to measure beam current and as a beam stopper for the commissioning modes. The main challenges for the design and manufacturing of the Faraday Cup are the high irradiation loads and the necessity of a compact design due to the space constraints in the MEBT. We describe the design of the FC, characterized by a graphite collector, required to withstand irradiation, and a repeller for suppression of secondary electrons. For the operation of the Faraday Cup acquisition electronics and control system are developed, all systems have been integrated in the ESS-Bilbao ECR ion source to test operation under beam conditions. In this work, we discuss the design of the Faraday Cup, the results of the tests and how they agree with the expected performance of the Faraday Cup.
	Poster MOPP014 [1.786 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP014
About •	paper received ※ 02 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP019	Development and Evaluation of an Alternative Sensor Lifetime Enhancement Technique Used with the Online-Radiation-Monitoring System (DosiMon) at the European XFEL at DESY, Hamburg	radiation, FEL, electron, controls	122
	F. Schmidt-Föhre, S. Arab, D. Nölle, R. Susen DESY, Hamburg, Germany
	The European XFEL (E-XFEL), that started operation in September 2017 at the DESY/XFEL site in Hamburg/Germany uses a single-tunnel concept, forcing all frontend machine devices and electronics to be located inside the accelerator tunnel. Electro-magnetic showers, mainly produced by gun dark-current, RF cavity field-emission and beam-losses expose these devices to damaging irradiation. The new Online-Radiation-Monitoring-System (DosiMon) is mainly used for surveillance of radiation sensitive permanent magnet structures, diagnostic devices and rack-housed electronics. The integrated dose from Gamma- and optional future Neutron-radiation measurements can be monitored online by the DosiMon system. Safety limits ensure the correct function of monitored devices, provided by lifecycle estimations as measures for on time part exchange, to prevent significant radiation damage. A first expansion state currently enables more than 500 gamma measuring points. The development of a new sensor lifetime enhancement technique for the utilized RadFet sensors is presented together with corresponding evaluation measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP019
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP028	Longitudinal Bunch-by-Bunch Feedback Systems for SuperKEKB LER	feedback, kicker, timing, cavity	159
	M. Tobiyama, J.W. Flanagan, T. Kobayashi, S. Terui KEK, Ibaraki, Japan J.D. Fox Stanford University, Stanford, California, USA
	Longitudinal bunch-by-bunch feedback systems to suppress coupled bunch instabilities with minimum bunch spacing of 2 ns have been constructed in SuperKEKB LER. Through the grow-damp and excite-damp experiments with several filling patterns and the transient-domain analysis of unstable modes, the behaviors of possible impedance sources have been evaluated. The measured performance of the system, together with the performance of the related systems such as slow phase feedback to the reference RF clock are reported.
	Poster MOPP028 [0.519 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP028
About •	paper received ※ 03 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP030	Preliminary Test of XBPM Local Feedback in TPS	feedback, electron, photon, electronics	163
	P.C. Chiu, J.-Y. Chuang, K.T. Hsu, K.H. Hu, C.H. Huang NSRRC, Hsinchu, Taiwan
	TPS is 3-GeV synchrotron light source which have opened for public users since September 2016 and now offers 400 mA top-up mode operation. The requirements of the long term orbit stability have been gradually more and more stringent. The report investigates the long-term orbit stability improved by applying local XBPM feedback.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP030
About •	paper received ※ 02 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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MOPP045	MAX IV Operations - Diagnostic Tools and Lessons Learned	storage-ring, synchrotron, status, injection	209
	B. Meirose, V. Abelin, B.E. Bolling, M. Brandin, R. Høier, A. Johansson, P. Lilja, J.S. Lundquist, S. Molloy, F. Persson, J.E. Petersson, R. Svärd MAX IV Laboratory, Lund University, Lund, Sweden
	In this contribution, I present some of the new beam diagnostic and monitoring tools developed by the MAX IV Operations Group. In particular, new BPM and accelerator tunes visualization tools and other simple but useful applications we have developed, such as our RF System Monitor, are presented. I also briefly share our experience with the development of audible alarms, which help operators monitor various parameters of the machine and explain how the implementation of all these tools have improved accelerator operations at MAX IV.
	Poster MOPP045 [2.879 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP045
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUBO02	FERMI-PSI Collaboration on Nano-Fabricated Wire-Scanners With Sub-Micrometer Resolution: Developments and Measurements.	FEL, electron, experiment, emittance	249
	G.L. Orlandi, S. Borrelli, Ch. David, E. Ferrari, V. Guzenko, B. Hermann, O. Huerzeler, R. Ischebeck, C. Lombosi, C. Ozkan Loch, E. Prat PSI, Villigen PSI, Switzerland N. Cefarin, S. Dal Zilio, M. Lazzarino IOM-CNR, Trieste, Italy M. Ferianis, G. Penco, M. Veronese Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Wire-scanners with micrometer resolution are in operation at SwissFEL and FERMI for measurements of the beam emittance and for beam profile monitoring (,). In addition, both laboratories are developing and testing innovative nano-fabricated wire-scanners capable of providing sub-micrometer resolution and being quasi non-destructive to the beam. Nano-fabricated wire-scanners with a free-standing design () and a sub-micrometer resolution (*) has been already successfully tested. In the present work, innovative nano-fabricated wire-scanners joining both features of a free-standing design and sub-micrometer resolution are presented. Experimental tests carried out at SwissFEL demonstrated the capability of such innovative wire-scanner solutions to resolve transverse profiles of the electron beams with a size of 400-500 nm without incurring in any resolution limit constraint and with a minimal beam perturbation. An overview on current status and results along with future developments of these nano-fabricated wire-scanners are here presented. ()G.L.Orlandi et al. PRAB 19, 092802 (2016). ()M.Veronese et al.this Conference. ()M.Veronese et al.NIM-A 891, 32-36, (2018) (***)S.Borrelli et al. Comm. Phys.-Nature, 1, 52 (2018).
	Slides TUBO02 [10.551 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUBO02
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUPP010	A Fast Wire Scanner System for the European XFEL	FEL, timing, detector, optics	304
	T. Lensch, B. Beutner, T. Wamsat DESY, Hamburg, Germany
	The European-XFEL is an X-ray Free Electron Laser facility located in Hamburg (Germany). The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations. Currently 14 Wire Scanner stations are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode for beam halo studies and beam optics matching. When operating with long bunch trains (>100 bunches) fast scans will be used to measure beam sizes in an almost non-destructive manner. This paper briefly describes the wire scanner setup and focusses on the fast scan concept and first measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP010
About •	paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP011	Observation of Scintillators Charging Effects at the European XFEL	FEL, electron, diagnostics, free-electron-laser	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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TUPP014	New Combined Function Wire Scanner-Screen Station for the High Resolution Transverse Profile Measurements at FERMI	electron, FEL, vacuum, laser	322
	M. Veronese, A. Abrami, M. Bossi, M. Ferianis, S. Grulja, G. Penco, M. Tudor Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	We present the upgrade of the transverse profile diagnostics at the end of the FERMI Linac with a new high resolution instrumentation with the aim of improving the accuracy of the measurement of the twiss parameters and of the emittance. A scintillating screen, has been adopted instead of OTR screen due to known COTR issues. We used the same COTR suppression geometry that we had already implemented on our intra undulator screens and YAG:Ce as scintillating material. Screen based transverse profile diagnostics provide single shot measurements with a typical resolution of the order of tens of microns mainly due to refraction effects, geometry and other physical material properties. To extend the resolution to the micron level needed in case of low charge operation, we have equipped the same vacuum chamber with a wire scanner housing 10 micron tungsten wires. This paper describes the design and the first operational experience with the new device and discusses advantages as well as limitations.
	Poster TUPP014 [0.638 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP014
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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TUPP018	Synchrotron Radiation Monitor for SuperKEKB Damping Ring in Phase-III Operation	damping, injection, positron, MMI	336
	H. Ikeda, J.W. Flanagan, H. Fukuma, H. Sugimoto, M. Tobiyama KEK, Ibaraki, Japan
	The SuperKEKB damping ring (DR) commissioned in March 2019, before main ring (MR) Phase-III operation. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. We constructed the DR in order to deliver a low-emittance positron beam. A synchrotron radiation monitor (SRM) was installed for beam diagnostics at the DR. Streak camera and gated camera were used for measurement of the damping time and the beam size. This paper shows the design of DR SRM and the result of the measurement.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP018
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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TUPP020	Development of a Gated IPM System for J-PARC MR	electron, detector, impedance, GUI	343
	K. Satou J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	In the Main Ring (MR) of Japan Proton Accelerator Research Complex (J-PARC), a residual-gas ionization profile monitor (IPM) is used to measure bunched beam profiles. After injection, the beam widths of the first ~20 bunched beams are analysed to correct the Quadruple oscillation. While only a few dozen profiles are required for this correction, the present IPM auto-matically measures all bunched beams, more than 2·10⁶ bunches from injection to the extraction, because the present IPM operates using DC. This system is unde-sirable due to the limited lifetime of the Micro Channel Plate (MCP) detector; the more particles the MCP senses, the more it loses gain flatness and thus lifetime. To improve this situation, a gated IPM system has been developed, in which the High Voltage (HV) is operated in pulse mode. Results of performance analysis of a new HV power supply, improvement of the electrodes, and particle-tracking simulation considering the space-charge-electric field of the bunched beam are de-scribed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP020
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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TUPP021	Development of 16 Electrodes Beam-size Monitors for J-PARC MR	emittance, quadrupole, proton, impedance	347
	M. Tajima, T. Nakaya Kyoto University, Kyoto, Japan T. Koseki, T. Toyama KEK, Tokai, Ibaraki, Japan
	For J-PARC, 16 electrodes beam-monitors are developed. It is possible to measure the transverse moments of beams from the induced voltages. A beam size is calculated from these in two locations with different values of beta functions. Beam-monitors such as a Flying Wire Monitor and an Ionization Profile Monitor (IPM) are already installed. However, the two monitors have issues in measuring higher intensity beams. The former is that the wire gets easily burned out and the latter is that there is a sign of the saturation by a space charge effect. Therefore, these aim at measuring the sizes of high intensity proton beams up to 4.2·10⁺¹³ protons/bunch, which corresponds to 1.3 MW in 1.16 s cycle operation of the MR. Furthermore, with high accuracy measurements, the injection mismatch from the RCS is to be decreased. In the beam test in February 2019, the signal-noise ratio (SNR) of this monitor in bunch-by-bunch measurements was nearly 40 dB and lower than the SNR > 50 dB which is comparable to IPM. To improve the SNR, we developed new LPFs for anti-aliasing and improved signal processing. In addition, the second monitor will be installed in August 2019 and tested with beams in November.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP021
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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TUPP028	Double-Wire Vibrating Wire Monitor (DW-VWM) for Beam Halo Monitoring in High-intensity Accelerators	vacuum, experiment, laser, electron	373
	D.H. Kwak, M. Chung UNIST, Ulsan, Republic of Korea S.G. Arutunian, A.V. Margaryan ANSL, Yerevan, Armenia G.S. Harutyunyan, E.G. Lazareva YSU, Yerevan, Armenia
	Funding: This work was partly supported by the National Research Foundation of Korea (Grants No. 2017M1A7A1A02016413). Double-Wire Vibrating Wire Monitor (DW-VWM) has been designed and manufactured to monitor the beam halo in high-intensity accelerators. Compared with the previous VWM, we increase the ratio between the aperture and wire length by using strong 5 mm x 5 mm Samarium-Cobalt magnets. In addition, we install two stainless steel vibrating wires on the same frame. The first wire is placed in the beam halo region for measurements, and the second wire, which is separated from the beam by a screen, is used to subtract background signal caused by ambient temperature shifts. The new electronics of the DW-VWM consist of two main boards: auto-generation unit which is placed near the VWM, and the frequency measurement unit which is placed in the control room (100 m distance operation was tested). Typical frequency of the VWM (at start tension about 0.7 of tensile strength) is about 8000 Hz. The temperature sensitivity is about 110 Hz/K with 0.2 mK Hz resolution. The VWM was tested in vacuum tank and the frequency corresponding to each vacuum level was analyzed. The process of oscillation excitation at different levels of vacuum was also investigated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP028
About •	paper received ※ 04 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019
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TUPP033	Laboratory and Beam Based Studies for Assessing the Performance of the New Fast Wire Scanners for the CERN Injector Complex	controls, feedback, laser, vacuum	392
	J. Emery, P. Andersson, W. Andreazza, J.M. Fernandez Ochoa, A. Goldblatt, D. Gudkov, F. Roncarolo, J.L. Sirvent, J. Tassan-Viol, R. Veness CERN, Geneva, Switzerland
	At CERN, fast beam wire scanners serve as reference transverse profile monitors in all synchrotrons. As part of the LHC Injector Upgrade project, a new generation of scanners has been designed to improve system reliability, precision and accuracy in view of higher brightness beams. This paper will discuss the performance achieved during both laboratory calibration and prototype testing with beam. The beam measurements performed in 2018 demonstrated excellent system reliability and reproducibility, while calibration in the laboratory showed that an accuracy below 10 um can be achieved on the wire position determination.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP033
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	controls, detector, diagnostics, 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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WECO03	Tune Computation via Model Fitting to Swept Machine Response Measurement	feedback, synchrotron, resonance, betatron	490
	M.G. Abbott, G. Rehm DLS, Oxfordshire, United Kingdom
	At Diamond Light Source we compute the horizontal and vertical tunes by fitting a simple multi-pole resonator model to the measured electron beam frequency response. The transverse (and longitudinal) tune response is measured by sweeping an excitation across the range of possible tune frequencies and synchronously measuring the IQ response. The multi-pole resonator model is a good fit to the measured behaviour, but the fitting process is surprisingly challenging. Problems include noisy measurements, very complex beam responses in the presence of increasing chromaticity, poor data when the beam is close to instability, and a number of challenges with the stability of the algorithm. The tune fitting algorithm now in use at Diamond has been developed and refined over many years. It is finally stable enough to work reliably throughout most beam operating conditions. The algorithm involves alternating peak finding and non-linear fitting, with a fairly naive mathematical approach; the main focus is on providing reliable results.
	Slides WECO03 [1.059 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO03
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WEPP003	A new button-type beam position monitor for BESSY II and BESSY VSR	impedance, vacuum, storage-ring, resonance	508
	J.G. Hwang, V. Dürr, F. Falkenstern, M. Ries, A. Schälicke, G. Schiwietz, D. Wolk HZB, Berlin, Germany
	Funding: This work was supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association. The future BESSY VSR system involves more than one order-of-magnitude differences in the total charge of adjacent short and long bunches within the bunch train. Thus, any signal ringing beyond a nanosecond in time will cause a misreading of beam position and current, specifically for low bunch charges. This calls for improved performance for the bunch-selective operation of the beam-position-monitor (BPM) system. We report on the corresponding design and fabrication of a new button BPM with advanced features, such as impedance matching inside the button as well as optimization of insulator material, button size, and position, for reduced crosstalk between buttons.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP003
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WEPP004	Concept of a Beam Diagnostics System for the Multi-Turn ERL Operation at the S-DALINAC	cavity, linac, recirculation, impedance	513
	M. Dutine, M. Arnold, T. Bahlo, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, M. Steinhorst TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by BMBF through grant No. 05H18RDRB2 and DFG through GRK 2128. The S-DALINAC* is a thrice-recirculating linear electron accelerator operating in cw-mode at a frequency of 3 GHz. A path-length adjustment system in the second recirculation beam line allows to shift the beam phase by 360° and thus to operate in ERL mode. For the multi-turn ERL operation, the beam will be accelerated twice and subsequently decelerated twice again (not demonstrated yet). For this mode, it is necessary to develop a nondestructive beam diagnostics system in order to measure the beam position, phase and beam current of both, the accelerated and the decelerated beam, simultaneously in the same beamline. A particular challenge will be the operation at low beam currents of 100 nA, which corresponds to bunch charges of about 30 aC. The conceptional study of a 6 GHz resonant cavity beam position monitor will be presented together with alternative solutions. * N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP004
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WEPP006	Operational Performance of New Detection Electronics for Stripline-Type Beam Position Monitors at the SuperKEKB Injector Linac	linac, quadrupole, emittance, monitoring	522
	F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada KEK, Ibaraki, Japan
	SuperKEKB injector linac delivers four different beam modes modulated pulse by pulse at 50 Hz, which have 100-times different beam charges, and a pulse may contain two bunches only 96-ns apart. Required low-emittance beams for SuperKEKB rings would need precise beam orbit controls in order to suppress the transverse wakefield in the accelerating structures. A new detection electronics with a wide dynamic range of 40 dB with a high resolution based on a 180-MHz narrow-band detection technique for stripline-type beam position monitors (BPMs) has been developed for the SuperKEKB injector linac. While such measurement condition is challenging, a position resolution of 3 micrometer in one standard deviation was successfully achieved with beam-based tests. The self-calibration system is also installed in order to compensate gain drifts for each input channel with an accuracy down to 0.1%, by using test pulses going through stripline heads between 50-Hz beam pulses. The design concept of the new detection electronics is described in detail, as well as operational performance of synchronized measurement with 100 BPMs for injection beams to four electron/positron storage rings.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP006
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WEPP035	Using Tune Measurement Systems Based on Diode Detectors for Quadrupolar Beam Oscillation Analysis in the Frequency Domain	injection, betatron, detector, pick-up	615
	M. Gąsior, T.E. Levens CERN, Geneva, Switzerland
	Requirements for diagnostics of injection matching and beam space charge effects have driven studies at CERN using high sensitivity tune measurement systems based on diode detectors for the observation of quadrupolar beam oscillations in the frequency domain. This has led to an extension of such tune systems to include a channel optimised for quadrupolar oscillation measurements. This paper presents the principles of such measurements, the developed hardware and example measurements.
	Poster WEPP035 [29.814 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP035
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THBO01	Machine Learning-Based Longitudinal Phase Space Prediction of Two-Bunch Operation at FACET-II	diagnostics, simulation, 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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Paper

Title

Other Keywords

Page

MOBO04

Characterization and First Beam Loss Detection with One ESS-nBLM System Detector

neutron, detector, linac, proton

29

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

The monitoring of losses is crucial in any accelerator. In the new high intensity hadron facilities even low energy beam can damage or activate the materials so the detection of small losses in this region is very important. A new type of neutron beam loss monitor has been developed specifically targeting this region, where only neutrons and photons can be produced and where typical BLM, based on charged particle detection, could not be appropriate because of the photon background due to the RF cavities. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and with little sensitivity to photons. Development of the detectors presented here has been done to fulfil the requirements of ESS and they will be part of the ESS-BI systems. The detector has been presented in previous editions of the conference. Here we focus on the neutron/gamma rejection with the final FEE and in the first operation of one of the modules in a beam during the commissioning of LINAC4 (CERN) with the detection of provoked losses and their clear separation from RF gammas. The ESS-nBLM system is presented in this conference in a separate contribution.

Slides MOBO04 [7.609 MB]

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MOCO04

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

diagnostics, electron, timing, 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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MOPP006

Commissioning of the Beam Loss Monitoring system for the HADES beam-line at GSI

detector, proton, simulation, heavy-ion

74

P. Boutachkov, S. Damjanovic, M. Sapinski, B. Walasek-Höhne
GSI, Darmstadt, Germany

The High Acceptance Di-Electron Spectrometer experiments at GSI (HADES) require high-intensity heavy ion beams. Monitoring and minimization of the beam losses are critical for the operation at the desired beam intensities. FAIR-type Beam Loss Monitor (BLM) system based on sixteen plastic scintillator detectors is installed along the beam line from the SIS-18 synchrotron to the experiment location. The detectors are used in counting mode, with maximum counting rate of order of 20 MHz. The system has been commissioned during the 2018 beam time. Details on the detector setup, its calibration procedure and how it can be used for quantitative beam loss determination are presented.

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MOPP007

Versatile Beamline Cryostat for the Cryogenic Current Comparator (CCC) for FAIR

cryogenics, resonance, vacuum, simulation

78

D.M. Haider, F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker, F. Ucar
GSI, Darmstadt, Germany
H. De Gersem, N. Marsic, W.F.O. Müller
TEMF, TU Darmstadt, Darmstadt, Germany
J. Golm
FSU Jena, Jena, Germany
J. Golm, T. Koettig
CERN, Meyrin, Switzerland
M. Schmelz, R. Stolz, V. Zakosarenko
IPHT, Jena, Germany
T. Stöhlker
IOQ, Jena, Germany
T. Stöhlker, V. Tympel
HIJ, Jena, Germany
V. Zakosarenko
Supracon AG, Jena, Germany

Funding: Work supported by AVA - Accelerators Validating Antimatter the EU H₂020 Marie-Curie Action No. 721559 and by the BMBF under contract No. 05P15SJRBA and 5P18SJRB1.
The Cryogenic Current Comparator (CCC) extends the measurement range of traditional non-destructive current monitors used in accelerator beamlines down to a few nano-amperes of direct beam current. This is achieved by a cryogenic environment of liquid helium around the beamline, in which the beam’s magnetic field is measured with a Superconducting Quantum Interference Device (SQUID), which is itself enclosed in a superconducting shielding structure. For this purpose, a versatile UHV-beamline cryostat was designed for the CCCs at FAIR and is currently in production. It is built for long-term autonomous operation with a closed helium re-liquefaction cycle and with good access to all inner components. The design is supported by simulations of the cryostat’s mechanical eigenmodes to minimize the excitation by vibrations in an accelerator environment. A prototype at GSI has demonstrated the self-contained cryogenic operation in combination with a 15 l/day re-liquefier. The cryostat will be used in CRYRING to compare the FAIR-CCC-X with newly developed CCC-types for 150 mm beamlines. Both which will supply a nA current reading during commissioning and for the experiments.

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MOPP010

Design and Properties of a New DCCT Chamber for the PF-Ring at KEK

simulation, impedance, HOM, cavity

91

R. Takai, T. Honda, T. Nogami, T. Obina, Y. Tanimoto
KEK, Ibaraki, Japan

A DC current transformer (DCCT) for the PF-ring was renewed during the 2018 summer shutdown. A vacuum chamber for the new DCCT was designed based on a circular duct with an inner diameter of 100 mm and has a structure housing a toroidal core inside of electromagnetic shields. The geometry of the ceramic break for interrupting the wall current flow was optimized using a three-dimensional electromagnetic field simulator, and the break was fabricated considering some technical limitations. Both ends of the ceramic break were short-circuited in a high-frequency manner by a sheet-like capacitive structure to suppress the radiation of unneeded higher-order modes (HOMs) into the core housing. The ceramic break is also equipped with water-cooling pipes on metal sleeves brazed to the both ends to efficiently remove the heat generated by HOMs. The new DCCT chamber has been used already in user operation without any problems. A temperature rise near the ceramic break is still approximately six degrees Celsius, even when a 50-mA isolated bunch is stored.

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MOPP014

Design of the ESS MEBT Faraday Cup

electron, radiation, MEBT, proton

106

A. Rodríguez Páramo, I. Bustinduy, I. Mazkiaran, R. Miracoli, V. Toyos, S. Varnasseri, D. de Cos, C. de la Cruz
ESS Bilbao, Zamudio, Spain
E.M. Donegani, J.P.S. Martins
ESS, Lund, Sweden

The European Spallation Source (ESS) is currently under construction and the Medium Energy Beam Transfer (MEBT) is developed by ESS-Bilbao as an in-kind contribution. In the MEBT a set of diagnostics is included for beam characterization, among them the MEBT Faraday Cup is used to measure beam current and as a beam stopper for the commissioning modes. The main challenges for the design and manufacturing of the Faraday Cup are the high irradiation loads and the necessity of a compact design due to the space constraints in the MEBT. We describe the design of the FC, characterized by a graphite collector, required to withstand irradiation, and a repeller for suppression of secondary electrons. For the operation of the Faraday Cup acquisition electronics and control system are developed, all systems have been integrated in the ESS-Bilbao ECR ion source to test operation under beam conditions. In this work, we discuss the design of the Faraday Cup, the results of the tests and how they agree with the expected performance of the Faraday Cup.

Poster MOPP014 [1.786 MB]

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MOPP019

Development and Evaluation of an Alternative Sensor Lifetime Enhancement Technique Used with the Online-Radiation-Monitoring System (DosiMon) at the European XFEL at DESY, Hamburg

radiation, FEL, electron, controls

122

F. Schmidt-Föhre, S. Arab, D. Nölle, R. Susen
DESY, Hamburg, Germany

The European XFEL (E-XFEL), that started operation in September 2017 at the DESY/XFEL site in Hamburg/Germany uses a single-tunnel concept, forcing all frontend machine devices and electronics to be located inside the accelerator tunnel. Electro-magnetic showers, mainly produced by gun dark-current, RF cavity field-emission and beam-losses expose these devices to damaging irradiation. The new Online-Radiation-Monitoring-System (DosiMon) is mainly used for surveillance of radiation sensitive permanent magnet structures, diagnostic devices and rack-housed electronics. The integrated dose from Gamma- and optional future Neutron-radiation measurements can be monitored online by the DosiMon system. Safety limits ensure the correct function of monitored devices, provided by lifecycle estimations as measures for on time part exchange, to prevent significant radiation damage. A first expansion state currently enables more than 500 gamma measuring points. The development of a new sensor lifetime enhancement technique for the utilized RadFet sensors is presented together with corresponding evaluation measurements.

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MOPP028

Longitudinal Bunch-by-Bunch Feedback Systems for SuperKEKB LER

feedback, kicker, timing, cavity

159

M. Tobiyama, J.W. Flanagan, T. Kobayashi, S. Terui
KEK, Ibaraki, Japan
J.D. Fox
Stanford University, Stanford, California, USA

Longitudinal bunch-by-bunch feedback systems to suppress coupled bunch instabilities with minimum bunch spacing of 2 ns have been constructed in SuperKEKB LER. Through the grow-damp and excite-damp experiments with several filling patterns and the transient-domain analysis of unstable modes, the behaviors of possible impedance sources have been evaluated. The measured performance of the system, together with the performance of the related systems such as slow phase feedback to the reference RF clock are reported.

Poster MOPP028 [0.519 MB]

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MOPP030

Preliminary Test of XBPM Local Feedback in TPS

feedback, electron, photon, electronics

163

P.C. Chiu, J.-Y. Chuang, K.T. Hsu, K.H. Hu, C.H. Huang
NSRRC, Hsinchu, Taiwan

TPS is 3-GeV synchrotron light source which have opened for public users since September 2016 and now offers 400 mA top-up mode operation. The requirements of the long term orbit stability have been gradually more and more stringent. The report investigates the long-term orbit stability improved by applying local XBPM feedback.

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MOPP045

MAX IV Operations - Diagnostic Tools and Lessons Learned

storage-ring, synchrotron, status, injection

209

B. Meirose, V. Abelin, B.E. Bolling, M. Brandin, R. Høier, A. Johansson, P. Lilja, J.S. Lundquist, S. Molloy, F. Persson, J.E. Petersson, R. Svärd
MAX IV Laboratory, Lund University, Lund, Sweden

In this contribution, I present some of the new beam diagnostic and monitoring tools developed by the MAX IV Operations Group. In particular, new BPM and accelerator tunes visualization tools and other simple but useful applications we have developed, such as our RF System Monitor, are presented. I also briefly share our experience with the development of audible alarms, which help operators monitor various parameters of the machine and explain how the implementation of all these tools have improved accelerator operations at MAX IV.

Poster MOPP045 [2.879 MB]

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TUBO02

FERMI-PSI Collaboration on Nano-Fabricated Wire-Scanners With Sub-Micrometer Resolution: Developments and Measurements.

FEL, electron, experiment, emittance

249

G.L. Orlandi, S. Borrelli, Ch. David, E. Ferrari, V. Guzenko, B. Hermann, O. Huerzeler, R. Ischebeck, C. Lombosi, C. Ozkan Loch, E. Prat
PSI, Villigen PSI, Switzerland
N. Cefarin, S. Dal Zilio, M. Lazzarino
IOM-CNR, Trieste, Italy
M. Ferianis, G. Penco, M. Veronese
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Wire-scanners with micrometer resolution are in operation at SwissFEL and FERMI for measurements of the beam emittance and for beam profile monitoring (*,**). In addition, both laboratories are developing and testing innovative nano-fabricated wire-scanners capable of providing sub-micrometer resolution and being quasi non-destructive to the beam. Nano-fabricated wire-scanners with a free-standing design (***) and a sub-micrometer resolution (****) has been already successfully tested. In the present work, innovative nano-fabricated wire-scanners joining both features of a free-standing design and sub-micrometer resolution are presented. Experimental tests carried out at SwissFEL demonstrated the capability of such innovative wire-scanner solutions to resolve transverse profiles of the electron beams with a size of 400-500 nm without incurring in any resolution limit constraint and with a minimal beam perturbation. An overview on current status and results along with future developments of these nano-fabricated wire-scanners are here presented.
(*)G.L.Orlandi et al. PRAB 19, 092802 (2016).
(**)M.Veronese et al.this Conference.
(***)M.Veronese et al.NIM-A 891, 32-36, (2018)
(****)S.Borrelli et al. Comm. Phys.-Nature, 1, 52 (2018).

Slides TUBO02 [10.551 MB]

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TUPP010

A Fast Wire Scanner System for the European XFEL

FEL, timing, detector, optics

304

T. Lensch, B. Beutner, T. Wamsat
DESY, Hamburg, Germany

The European-XFEL is an X-ray Free Electron Laser facility located in Hamburg (Germany). The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations. Currently 14 Wire Scanner stations are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode for beam halo studies and beam optics matching. When operating with long bunch trains (>100 bunches) fast scans will be used to measure beam sizes in an almost non-destructive manner. This paper briefly describes the wire scanner setup and focusses on the fast scan concept and first measurements.

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TUPP011

Observation of Scintillators Charging Effects at the European XFEL

FEL, electron, diagnostics, free-electron-laser

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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TUPP014

New Combined Function Wire Scanner-Screen Station for the High Resolution Transverse Profile Measurements at FERMI

electron, FEL, vacuum, laser

322

M. Veronese, A. Abrami, M. Bossi, M. Ferianis, S. Grulja, G. Penco, M. Tudor
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

We present the upgrade of the transverse profile diagnostics at the end of the FERMI Linac with a new high resolution instrumentation with the aim of improving the accuracy of the measurement of the twiss parameters and of the emittance. A scintillating screen, has been adopted instead of OTR screen due to known COTR issues. We used the same COTR suppression geometry that we had already implemented on our intra undulator screens and YAG:Ce as scintillating material. Screen based transverse profile diagnostics provide single shot measurements with a typical resolution of the order of tens of microns mainly due to refraction effects, geometry and other physical material properties. To extend the resolution to the micron level needed in case of low charge operation, we have equipped the same vacuum chamber with a wire scanner housing 10 micron tungsten wires. This paper describes the design and the first operational experience with the new device and discusses advantages as well as limitations.

Poster TUPP014 [0.638 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP014

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paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019

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TUPP018

Synchrotron Radiation Monitor for SuperKEKB Damping Ring in Phase-III Operation

damping, injection, positron, MMI

336

H. Ikeda, J.W. Flanagan, H. Fukuma, H. Sugimoto, M. Tobiyama
KEK, Ibaraki, Japan

The SuperKEKB damping ring (DR) commissioned in March 2019, before main ring (MR) Phase-III operation. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. We constructed the DR in order to deliver a low-emittance positron beam. A synchrotron radiation monitor (SRM) was installed for beam diagnostics at the DR. Streak camera and gated camera were used for measurement of the damping time and the beam size. This paper shows the design of DR SRM and the result of the measurement.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP018

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paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

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TUPP020

Development of a Gated IPM System for J-PARC MR

electron, detector, impedance, GUI

343

K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

In the Main Ring (MR) of Japan Proton Accelerator Research Complex (J-PARC), a residual-gas ionization profile monitor (IPM) is used to measure bunched beam profiles. After injection, the beam widths of the first ~20 bunched beams are analysed to correct the Quadruple oscillation. While only a few dozen profiles are required for this correction, the present IPM auto-matically measures all bunched beams, more than 2·10⁶ bunches from injection to the extraction, because the present IPM operates using DC. This system is unde-sirable due to the limited lifetime of the Micro Channel Plate (MCP) detector; the more particles the MCP senses, the more it loses gain flatness and thus lifetime. To improve this situation, a gated IPM system has been developed, in which the High Voltage (HV) is operated in pulse mode. Results of performance analysis of a new HV power supply, improvement of the electrodes, and particle-tracking simulation considering the space-charge-electric field of the bunched beam are de-scribed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP020

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paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

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TUPP021

Development of 16 Electrodes Beam-size Monitors for J-PARC MR

emittance, quadrupole, proton, impedance

347

M. Tajima, T. Nakaya
Kyoto University, Kyoto, Japan
T. Koseki, T. Toyama
KEK, Tokai, Ibaraki, Japan

For J-PARC, 16 electrodes beam-monitors are developed. It is possible to measure the transverse moments of beams from the induced voltages. A beam size is calculated from these in two locations with different values of beta functions. Beam-monitors such as a Flying Wire Monitor and an Ionization Profile Monitor (IPM) are already installed. However, the two monitors have issues in measuring higher intensity beams. The former is that the wire gets easily burned out and the latter is that there is a sign of the saturation by a space charge effect. Therefore, these aim at measuring the sizes of high intensity proton beams up to 4.2·10⁺¹³ protons/bunch, which corresponds to 1.3 MW in 1.16 s cycle operation of the MR. Furthermore, with high accuracy measurements, the injection mismatch from the RCS is to be decreased. In the beam test in February 2019, the signal-noise ratio (SNR) of this monitor in bunch-by-bunch measurements was nearly 40 dB and lower than the SNR > 50 dB which is comparable to IPM. To improve the SNR, we developed new LPFs for anti-aliasing and improved signal processing. In addition, the second monitor will be installed in August 2019 and tested with beams in November.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP021

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paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019

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TUPP028

Double-Wire Vibrating Wire Monitor (DW-VWM) for Beam Halo Monitoring in High-intensity Accelerators

vacuum, experiment, laser, electron

373

D.H. Kwak, M. Chung
UNIST, Ulsan, Republic of Korea
S.G. Arutunian, A.V. Margaryan
ANSL, Yerevan, Armenia
G.S. Harutyunyan, E.G. Lazareva
YSU, Yerevan, Armenia

Funding: This work was partly supported by the National Research Foundation of Korea (Grants No. 2017M1A7A1A02016413).
Double-Wire Vibrating Wire Monitor (DW-VWM) has been designed and manufactured to monitor the beam halo in high-intensity accelerators. Compared with the previous VWM, we increase the ratio between the aperture and wire length by using strong 5 mm x 5 mm Samarium-Cobalt magnets. In addition, we install two stainless steel vibrating wires on the same frame. The first wire is placed in the beam halo region for measurements, and the second wire, which is separated from the beam by a screen, is used to subtract background signal caused by ambient temperature shifts. The new electronics of the DW-VWM consist of two main boards: auto-generation unit which is placed near the VWM, and the frequency measurement unit which is placed in the control room (100 m distance operation was tested). Typical frequency of the VWM (at start tension about 0.7 of tensile strength) is about 8000 Hz. The temperature sensitivity is about 110 Hz/K with 0.2 mK Hz resolution. The VWM was tested in vacuum tank and the frequency corresponding to each vacuum level was analyzed. The process of oscillation excitation at different levels of vacuum was also investigated.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP028

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paper received ※ 04 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019

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TUPP033

Laboratory and Beam Based Studies for Assessing the Performance of the New Fast Wire Scanners for the CERN Injector Complex

controls, feedback, laser, vacuum

392

J. Emery, P. Andersson, W. Andreazza, J.M. Fernandez Ochoa, A. Goldblatt, D. Gudkov, F. Roncarolo, J.L. Sirvent, J. Tassan-Viol, R. Veness
CERN, Geneva, Switzerland

At CERN, fast beam wire scanners serve as reference transverse profile monitors in all synchrotrons. As part of the LHC Injector Upgrade project, a new generation of scanners has been designed to improve system reliability, precision and accuracy in view of higher brightness beams. This paper will discuss the performance achieved during both laboratory calibration and prototype testing with beam. The beam measurements performed in 2018 demonstrated excellent system reliability and reproducibility, while calibration in the laboratory showed that an accuracy below 10 um can be achieved on the wire position determination.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP033

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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

controls, detector, diagnostics, 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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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP043

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paper received ※ 05 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

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WECO03

Tune Computation via Model Fitting to Swept Machine Response Measurement

feedback, synchrotron, resonance, betatron

490

M.G. Abbott, G. Rehm
DLS, Oxfordshire, United Kingdom

At Diamond Light Source we compute the horizontal and vertical tunes by fitting a simple multi-pole resonator model to the measured electron beam frequency response. The transverse (and longitudinal) tune response is measured by sweeping an excitation across the range of possible tune frequencies and synchronously measuring the IQ response. The multi-pole resonator model is a good fit to the measured behaviour, but the fitting process is surprisingly challenging. Problems include noisy measurements, very complex beam responses in the presence of increasing chromaticity, poor data when the beam is close to instability, and a number of challenges with the stability of the algorithm. The tune fitting algorithm now in use at Diamond has been developed and refined over many years. It is finally stable enough to work reliably throughout most beam operating conditions. The algorithm involves alternating peak finding and non-linear fitting, with a fairly naive mathematical approach; the main focus is on providing reliable results.

Slides WECO03 [1.059 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO03

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paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019

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WEPP003

A new button-type beam position monitor for BESSY II and BESSY VSR

impedance, vacuum, storage-ring, resonance

508

J.G. Hwang, V. Dürr, F. Falkenstern, M. Ries, A. Schälicke, G. Schiwietz, D. Wolk
HZB, Berlin, Germany

Funding: This work was supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association.
The future BESSY VSR system involves more than one order-of-magnitude differences in the total charge of adjacent short and long bunches within the bunch train. Thus, any signal ringing beyond a nanosecond in time will cause a misreading of beam position and current, specifically for low bunch charges. This calls for improved performance for the bunch-selective operation of the beam-position-monitor (BPM) system. We report on the corresponding design and fabrication of a new button BPM with advanced features, such as impedance matching inside the button as well as optimization of insulator material, button size, and position, for reduced crosstalk between buttons.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP003

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

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WEPP004

Concept of a Beam Diagnostics System for the Multi-Turn ERL Operation at the S-DALINAC

cavity, linac, recirculation, impedance

513

M. Dutine, M. Arnold, T. Bahlo, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, M. Steinhorst
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by BMBF through grant No. 05H18RDRB2 and DFG through GRK 2128.
The S-DALINAC* is a thrice-recirculating linear electron accelerator operating in cw-mode at a frequency of 3 GHz. A path-length adjustment system in the second recirculation beam line allows to shift the beam phase by 360° and thus to operate in ERL mode. For the multi-turn ERL operation, the beam will be accelerated twice and subsequently decelerated twice again (not demonstrated yet). For this mode, it is necessary to develop a nondestructive beam diagnostics system in order to measure the beam position, phase and beam current of both, the accelerated and the decelerated beam, simultaneously in the same beamline. A particular challenge will be the operation at low beam currents of 100 nA, which corresponds to bunch charges of about 30 aC. The conceptional study of a 6 GHz resonant cavity beam position monitor will be presented together with alternative solutions.
* N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP004

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

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WEPP006

Operational Performance of New Detection Electronics for Stripline-Type Beam Position Monitors at the SuperKEKB Injector Linac

linac, quadrupole, emittance, monitoring

522

F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada
KEK, Ibaraki, Japan

SuperKEKB injector linac delivers four different beam modes modulated pulse by pulse at 50 Hz, which have 100-times different beam charges, and a pulse may contain two bunches only 96-ns apart. Required low-emittance beams for SuperKEKB rings would need precise beam orbit controls in order to suppress the transverse wakefield in the accelerating structures. A new detection electronics with a wide dynamic range of 40 dB with a high resolution based on a 180-MHz narrow-band detection technique for stripline-type beam position monitors (BPMs) has been developed for the SuperKEKB injector linac. While such measurement condition is challenging, a position resolution of 3 micrometer in one standard deviation was successfully achieved with beam-based tests. The self-calibration system is also installed in order to compensate gain drifts for each input channel with an accuracy down to 0.1%, by using test pulses going through stripline heads between 50-Hz beam pulses. The design concept of the new detection electronics is described in detail, as well as operational performance of synchronized measurement with 100 BPMs for injection beams to four electron/positron storage rings.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP006

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paper received ※ 09 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019

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WEPP035

Using Tune Measurement Systems Based on Diode Detectors for Quadrupolar Beam Oscillation Analysis in the Frequency Domain

injection, betatron, detector, pick-up

615

M. Gąsior, T.E. Levens
CERN, Geneva, Switzerland

Requirements for diagnostics of injection matching and beam space charge effects have driven studies at CERN using high sensitivity tune measurement systems based on diode detectors for the observation of quadrupolar beam oscillations in the frequency domain. This has led to an extension of such tune systems to include a channel optimised for quadrupolar oscillation measurements. This paper presents the principles of such measurements, the developed hardware and example measurements.

Poster WEPP035 [29.814 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP035

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paper received ※ 03 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

diagnostics, simulation, 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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