IBIC2019 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
MOAO03	Overview on the Diagnostics for EBS-ESRF	storage-ring, feedback, SRF, diagnostics	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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MOPP004	Development and Calibration of a Multi-Leaf Faraday Cup for the Determination of the Beam Energy of a 50 MeV Electron LINAC in Real-Time	electron, detector, proton, real-time	67
	C. Makowski, A. Schüller PTB, Braunschweig, Germany
	The Physikalisch-Technische Bundesanstalt (PTB), Germany’s national primary standard laboratory, operates an electron LINAC with variable energy (0.5 - 50 MeV). All parameters of the LINAC which influence the RF power (as e.g. the high voltage at modulator) as well as the number of charged particles in a bunch to be accelerated (as e.g. via gun emission) also change the beam energy. To measure the energy during the preparation or optimization of a beam, a Multi-Leaf Faraday Cup (MLFC) was developed. This MLFC allows the measurement of energy and pulse charge in real time, so the influence of the manipulated variables on energy and beam power can be immediately assessed. The MLFC consists of 128 electrically isolated Al plates where the thickness of the entire stack is sufficient to stop a 50 MeV electron beam. After each beam pulse, the charge collected by the Al plates is recorded sequentially. The MLFC was calibrated with monoenergetic electron beams at output of a magnetic spectrometer. Then the MLFC was installed at the end of the accelerator structure. From the recorded charge distributions, the corresponding energy is determined in real time and displayed for each beam pulse.
	Poster MOPP004 [3.739 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP004
About •	paper received ※ 30 August 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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MOPP005	Radiation hardness investigation of Zinc oxide fast scintillators with relativistic heavy ion beams.	detector, heavy-ion, target, site	71
	P. Boutachkov, A. Reiter, M. Saifulin, B. Walasek-Höhne GSI, Darmstadt, Germany E.I. Gorokhova GOI, St Petersburg, Russia P. Rodnyi, I.D. Venevtsev SPbPU, St. Petersburg, Russia
	At GSI ion beams of many elements, from H up to U, are produced with energy as high as 4.5 GeV/u with the SIS-18 synchrotron. For absolute beam intensity and micro-spill structure measurements a BC400 organic scintillator is used. Due to the low radiation hardness of this material, alternative inorganic scintillators like ZnO:Ga and ZnO:In were investigated. The properties and possible application of these novel radiation hard fast scintillators will be discussed. Their response to Sn, Xe and U ion beams will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP005
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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MOPP012	Development of Compact Ionization Chambers for Particle Therapy Facilities	proton, electronics, electron, high-voltage	100
	M. Liu, C.X. Yin SSRF, Shanghai, People’s Republic of China
	Dose monitors and position monitors are critical equipment for particle therapy facilities. Performance of the monitors affects precision of irradiation dose and dose distribution. Parallel plate ionization chambers with free air are adopted for dose monitors and position monitors. Radiation-hardened front-end electronics are integrated in the chambers, and the output of the chambers are digital signals. The structure of the monitors is compact, modularized and easy-to-use. The ionization chambers are implemented successfully in Shanghai Advanced Proton Therapy Facility. The development details and implementation status are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP012
About •	paper received ※ 02 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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MOPP014	Design of the ESS MEBT Faraday Cup	electron, MEBT, proton, operation	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	FEL, operation, 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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MOPP020	First Tests Using Sipm Based Beam Loss Monitors at the European XFEL	FEL, undulator, detector, photon	127
	T. Wamsat, P.A. Smirnov DESY, Hamburg, Germany
	The European XFEL MTCA based Beam Loss Monitor System (BLM) is composed of about 450 monitors using photomultiplier tubes (PMTs). BLMs installed in the SASE undulator intersections show high signals at electron energy higher 16 GeV or photon energy higher 14 keV due to background synchrotron radiation which directly affects the PMT. The amplitude of this signal can get that high that, also without using any scintillating material, the BLMs get blind for real losses. Also different lead arrangements did not shield the signal sufficiently. First tests show that a Silicon photomultiplier (SiPM) is not affected. Also there are several advantages to use SiPM, they are cheaper by factor of 40 and operating voltage is below 45V. First test will be presented and how it can get implemented in the existing BLMs and BLM system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP020
About •	paper received ※ 04 September 2019 paper accepted ※ 08 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	diagnostics, target, beam-diagnostic, 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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TUAO02	Beam-Loss Detection for LCLS-II	detector, linac, gun, electron	229
	A.S. Fisher, C.I. Clarke, B.T. Jacobson, R.A. Kadyrov, E. Rodriguez, L. Sapozhnikov, J.J. Welch SLAC, Menlo Park, California, USA
	SLAC is now installing LCLS-II, a superconducting electron linac driven by continuous RF at 1.3 GHz. The 4-GeV, 120-kW beam has a maximum rate of nearly 1 MHz and can be switched pulse-by-pulse to either of two undulators, to generate hard and soft x rays. Two detector types measure beam losses. Point beam-loss monitors (PBLMs) set limits at critical loss points: septa, beam stoppers and dumps, halo collimators, protection collimators (which normally receive no loss), and zones with weak shielding. PBLMs are generally single-crystal diamond detectors, except at the gun, where a scintillator on a PMT is more sensitive to the low-energy (1 MeV) beam. Long beam-loss monitors (LBLMs) use 200-m lengths of radiation-hard optical fiber, each coupled to a PMT, to capture Cherenkov light from loss showers. LBLMs protect the entire 4-km path from gun to beam dump and locate loss points. In most regions two fibers provide redundancy and view the beam from different angles. Loss signals are integrated with a 500-ms time constant and compared to a threshold; if exceeded, the beam is stopped within 0.2 ms. We report on our extensive tests of the detectors and the front-end signal processing.
	Slides TUAO02 [4.268 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUAO02
About •	paper received ※ 03 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUAO03	Beam Loss Measurements Using the Cherenkov Effect in Optical Fiber for the BINP e⁻e⁺ Injection Complex	electron, extraction, beam-losses, injection	233
	Yu.I. Maltseva, A.R. Frolov, V.G. Prisekin BINP SB RAS, Novosibirsk, Russia
	Optical fiber based beam loss monitor (OFBLM) has been developed for the 500 MeV BINP Injection Complex (IC). Such monitor is useful for accelerator commissioning and beam alignment, and allows real-time monitoring of e⁻e⁺ beam loss position and intensity. Single optical fiber (OF) section can cover the entire accelerator instead of using a large number of local beam loss monitors. In this paper brief OFBLM selection in comparison with other distributed loss monitors was given. Methods to improve monitor spatial resolution are discussed. By selecting 45 m long silica fiber (with a large core of 550 um) and microchannel plate photomultiplier (MCP-PMT), less than 1 m spatial resolution can be achieved.
	Slides TUAO03 [3.053 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUAO03
About •	paper received ※ 05 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUBO01	Screens for High Precision Measurements	electron, diagnostics, 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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TUCO02	Experimental Observation of Submillimeter Coherent Cherenkov Radiation at CLARA Facility	experiment, electron, detector, target	261
	K.V. Fedorov, P. Karataev, A.N. Oleinik JAI, Egham, Surrey, United Kingdom K.V. Fedorov, A. Potylitsyn, A. Potylitsyn TPU, Tomsk, Russia P. Karataev Royal Holloway, University of London, Surrey, United Kingdom A.N. Oleinik BelSU, Belgorod, Russia T.H. Pacey, Y.M. Saveliev STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom T.H. Pacey UMAN, Manchester, United Kingdom Y.M. Saveliev Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Nowadays, the method of longitudinal beam profile diagnostic based on transition radiation (TR) spectrum is well studied [1] and is constantly being applied, while using of coherent Cherenkov radiation (CCR) is a modern task that opens up new possibilities in this area [2]. In current work we conducted experiments on CCR generation, observation and it further spectral analysis at 0.1-30 THz spectral range. All experimental work was at CLARA (beam area 1) facility (~50 MeV beam energy at up to 10 Hz pulse repetition rate with sub-ps bunch length). Inside of vacuum chamber we developed movable platform where both VCR and TR target were placed, which is allows us to observe both effects during one accelerator run. For spectral analysis we used Martin-Pupplet interferometer as it provides higher signal to noise ratio and allows us to perform instabilities normalisation. As a result we will demonstrate a selection of interferograms and spectrums (as well as reconstructed longitudinal beam profiles) for different machine setups and distances between charged particle beam and Cherenkov target. By using mathematical analysis it has been shown that CLARA bunch length was about 1.2 ps.
	Slides TUCO02 [22.952 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUCO02
About •	paper received ※ 03 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP001	KALYPSO: Linear Array Detector with Continuous Read-Out at MHz Frame Rates	FEL, detector, electron, laser	271
	C. Gerth, B. Steffen DESY, Hamburg, Germany M. Caselle, L. Rota KIT, Karlsruhe, Germany D.R. Makowski, A. Mielczarek TUL-DMCS, Łódź, Poland
	The novel linear array detector KALYPSO has been developed for beam diagnostics based on 1-dimensional profile measurements at high-repetition rate free-electron lasers (FEL) and synchrotron radiation facilities. The current version of KALYPSO has 256 pixels with a maximum frame rate of 2.7~MHz. The detector board, which comprises the radiation sensor, analog signal amplification, and analog-to-digital signal conversion, has been designed as a mezzanine card that can be plugged onto application-specific carrier boards for data pre-processing and transmission. Either a Si or InGaAs sensor can be mounted for the detection of visible or near infrared radiation. Results obtained in several beam diagnostics applications at the European XFEL and FLASH are presented to demonstrate the powerful capabilities of the KALYPSO detector. * The KAYLYPSO detector is a collaboration between the Karlsruhe Institute of Technology, Paul Scherrer Institut, Łódź University of Technology, and Deutsches-Elektronen Synchrotron.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP001
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUPP007	Transverse Phase Space Scanner Developments at IPHC	emittance, neutron, electron, ECR	293
	F.R. Osswald, T. Adam, P.G. Graehling, M. Heine, C. Maazouzi, E.K. Traykov IPHC, Strasbourg Cedex 2, France
	Emittance characterization of charged particle beams is a standard and important tool to assess the performances of a facility. Due to emittance growth, beam losses and space charge the measurement of the transverse phase space distributions of the charged particles is still an up-to-date issue even at low energy and for wide beams. It enables detailled characterization of particle position and incidence in addition to other diagnostics. It gives access to the particles distribution at the boarder, a region of lower density important for high power accelerators and high intensity radioactive beams as they request reduced losses and damages thus less contaminated parts and nuclear waste for a safe handling during maintenance. Transverse Phase Space Scanners are designed at IPHC and based on the Allison system. They are currently used on different injection channels of large facilities as SPIRAL 2 and FAIR and will be used in the future on the DC280/SHE facility at JINR. A review of the IPHC’s high resolution scanner design, development programme and future challenges are presented espacially for beam halo analysis and "loss less" beam transport lines.
	Poster TUPP007 [1.475 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP007
About •	paper received ※ 03 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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TUPP008	Thermal Simulations of Optical Transition Radiation Targets	target, linac, emittance, simulation	297
	J. Pforr, M. Arnold, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by DFG through GRK 2128 The recirculating electron linac S-DALINAC* provides beams with currents up to 20 µA and energies up to 130 MeV. It is planned to extend the beam diagnostics by adding multiple emittance measurement systems in order to investigate the emittance evolution along the beamline. The emittance measurement is based on the quadrupole scan technique and utilizes the existing quadrupoles and newly built optical transition radiation targets. As the targets are heated by the beam and destruction must be avoided, simulations of the thermal behaviour of the target were conducted. In particular, the dependence of the target temperature on the target design, but also variable parameters as beam spot size and current were investigated. This contribution will present these parameter studies. * N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)
	Poster TUPP008 [1.114 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP008
About •	paper received ※ 03 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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TUPP009	Determination of the Momentum Spread While Running in the ERL Mode at the S-DALINAC*	linac, electron, recirculation, quadrupole	300
	F. Schließmann, M. Arnold, M. Dutine, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by DFG through GRK 2128 and BMBF through grant No. 05H18RDRB2 The recirculating superconducting electron accelerator S-DALINAC [1] at TU Darmstadt is capable to run as a onefold or twofold Energy Recovery Linac (ERL) with a maximum energy of approximately 34 or 68 MeV in ERL mode, respectively. After the final acceleration in ERL mode, the momentum spread at the intended interaction point has to be determined. In order to investigate that momentum spread, a nondestructive measurement method is necessary. For this reason, it is planned to expand the beam horizontally in a section close to the interaction point by providing a well-defined horizontal dispersion. Using a wire scanner in this section for measuring the horizontal profile of the electron distribution, one can determine the momentum spread. The method of determining the momentum spread using the horizontal dispersion and the design of the wire scanner will be presented in this contribution. [1] N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018).*
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP009
About •	paper received ※ 03 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUPP012	Image of the Transverse Bunch Profile via COTR	electron, laser, target, simulation	313
	A. Potylitsyn, T. Gusvitskii, L.G. Sukhikh TPU, Tomsk, Russia G. Kube, A.I. Novokshonov DESY, Hamburg, Germany
	Funding: This work was supported by the grant of the Russian Ministry of Science # 3/1903.2017. Transverse beam profile diagnostics based on Optical Transition Radiation (OTR) is a routine technique at most modern electron linear accelerators (linacs) which is difficult to implement for FEL beams [] and LWPA accelerators []. The reason is that a standard OTR beam profile monitor with a few micrometers space resolution cannot be used for measurements of ultrashort bunch profiles due to coherent effects in the OTR emission process [*]. We have developed an approach which allows calculating the propagation of coherent optical transition radiation (COTR) through a standard optical system consisting of a focusing lens and a spatial resolving detector placed in the image plane. Strict summation of the OTR fields emitted coherently by electrons inside the bunch and its focusing onto the detector plane allows obtaining a COTR image of the bunch profile. With the assumption of a Gaussian transverse bunch profile it is shown that the resulting image has a typical "ring" shape, characteristics of which are depended on the bunch transverse rms size and optical system parameters. E. Saldin, et al., "The Physics of Free Electron Lasers", Springer-Verlag, 2010. N. Bourgeois, et al., AIP Conf. Proc., 1507, 258 (2012). * H. Loos, R. Akre, et al., SLAC-PUB-13395 (2008).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP012
About •	paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP017	Thermal Performance of Diamond SR Extraction Mirrors for SuperKEKB	extraction, MMI, optics, electron	332
	J.W. Flanagan, M. Arinaga, H. Fukuma, H. Ikeda, G. Mitsuka, Y. Suetsugu KEK, Ibaraki, Japan E. Mulyani BATAN, Yogyakarta, Indonesia E. Mulyani Sokendai, Ibaraki, Japan
	The SuperKEKB accelerator is a high-current, low-emittance upgrade to the KEKB double ring collider. The beryllium extraction mirrors used for the synchrotron radiation (SR) monitors at KEKB suffered from heat distortion due to incident SR, leading to systematic changes in magnification with beam current, and necessitating continuous monitoring and compensation of such distortions in order to correctly measure the beam sizes.* To minimize such mirror distortions, quasi-monocrystalline CVD diamond mirrors have been designed and installed at SuperKEKB.** Diamond has a very high heat conductance and a low thermal expansion coefficient. With such mirrors it is hoped to reduce the beam current-dependent magnification to the level of a few percent at SuperKEKB. Preliminary measurements of mirror distortion during SuperKEKB commissioning show very promising results with regard to thermal performance, though full beam currents have not yet been stored in the SuperKEKB rings. Measurements of the thermal deformation of the diamond mirrors will be presented in this paper, along with a description of the design of the mirrors and their mounts, and issues encountered during commissioning. M. Arinaga et al., NIM, A499, p. 100 (2003). *J.W. Flanagan et al., "Diamond mirrors for the SuperKEKB synchrotron radiation monitors," Proc. IBIC2012, Tsukuba, Japan p. 515 (2012).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP017
About •	paper received ※ 09 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP030	Analysis of Heavy Ion Irradiation Field Nonuniformity Using Track Detectors during Electronic Components Testing	heavy-ion, detector, electron, experiment	381
	A.S. Bychkov, P.A. Chubunov, A.S. Konyukhov, A.A. Pavlov ISDE, Moscow, Russia
	Determining the applicability of electronic components in spacecrafts involves conducting the tests using heavy ions. The Branch of URSC - ISDE and FLNR of JINR have created and operate the only in Russia test facilities based on the FLNR JINR accelerators allowing for heavy ion irradiation over a large area up to 200x200 mm. During simultaneous irradiation of several electronic components with heavy ions, it is necessary to ensure the device under test (DUT) location within the area of minimal nonuniformity. This problem is being solved by pretest determination of the irradiation field nonuniformity for each type of ion (Ne, Ar, Kr, Xe, Bi) and nonuniformity validation every 12 hours. Fluence is determined by a metrologically certified method using track detectors. In order to visualize the irradiation field nonuniformity, additional experiments were carried out with the irradiation of track detec-tors covering the entire irradiation area for each ion species. Based on the data obtained, a map of nonuniformity was plotted, which allows us to conclude that nonuniformity does not exceed 10% in the most frequently used areas of the irradiation field (100x150 mm) during SEE testing.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP030
About •	paper received ※ 04 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP031	Electron Beam Size Measurements Using the Heterodyne Near Field Speckles at ALBA	experiment, synchrotron, undulator, synchrotron-radiation	383
	M. Siano, M.A.C. Potenza Universita’ degli Studi di Milano & INFN, Milano, Italy U. Iriso, C.S. Kamma-Lorger, A.A. Nosych ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain S. Mazzoni, G. Trad CERN, Geneva, Switzerland B. Paroli Universita’ degli Studi di Milano, Milano, Italy
	Experiments using the heterodyne near field speckle method (HNFS) have been performed at ALBA to characterize the spatial coherence of the synchrotron radiation, with the ultimate goal of measuring both the horizontal and vertical electron beam sizes. The HNFS technique consists on the analysis of the interference between the radiation scattered by a colloidal suspension of nanoparticles and the synchrotron radiation, which in this case corresponds to the hard x-rays (12keV) produced by the in-vacuum undulator of the NCD-Sweet beamline. This paper describes the fundamentals of the technique, possible limitations, and shows the first experimental results changing the beam coupling of the storage ring.
	Poster TUPP031 [2.093 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP031
About •	paper received ※ 06 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP042	Turn-by-Turn Synchrotron Radiation Transverse Profile Monitor for IOTA	experiment, optics, electron, lattice	432
	N. Kuklev, Y.K. Kim University of Chicago, Chicago, Illinois, USA
	Funding: Work supported by National Science Foundation award PHY-1549132, the Center for Bright Beams. Fermi Research Alliance operates Fermilab under Contract DE-AC02-07CH11359 with the US Dept. of Energy. The Integrable Optics Test Accelerator is a research electron and proton storage ring recently commissioned at Fermilab. A key part of its beam diagnostics suite are synchrotron radiation monitors, used for measuring transverse beam profile, position, and intensity. So far, this system has used only visible light cameras, which are optimal for orbit measurements but do not provide turn-by-turn temporal resolution needed for beam dynamics analysis. Current electrostatic BPM system, while capable of turn-by-turn acquisition, will be pushed to its limits of accuracy and linearity by the requirements of planned nonlinear integrable optics experiments, and furthermore does not provide transverse profile data. To address these drawbacks, we present in this paper the design of a turn-by-turn BPM system based on a multi-anode photomultiplier detector. Extensive simulations are shown, combining both particle and optics tracking. A potential hardware and readout architecture is described. Statistical and systematic errors are explored. We conclude by outlining the prototype testing plans for run 2 in the fall of 2019, and other future work.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP042
About •	paper received ※ 11 September 2019 paper accepted ※ 12 September 2019 issue date ※ 10 November 2019
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WEPP026	Electron Bunch Compression Monitors for Short Bunches - Commissioning Results from SwissFEL	electron, FEL, linac, detector	578
	F. Frei, R. Ischebeck PSI, Villigen PSI, Switzerland
	In SwissFEL, by using three magnetic chicanes, 3ps long electron bunches can by compressed by a factor of more than 100 down to a few fs in order to generate ultra short X-ray pulses. In order to meet the envisaged beam performance, noninvasive longitudinal diagnostic after each compression stage is essential. These bunch compression monitors measure relative bunch length changes on a shot-to-shot basis by detecting coherent edge, synchrotron or diffraction radiation emitted by the electron bunches. While after the first two magnetic chicanes, a wide spectral part is integrated on a single broadband detector, an infrared spectrometer installed after the third magnetic chicane is providing more detailed information. Here, we will mainly report on commissioning results of the third bunch compression monitor for electron bunches of a few fs.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP026
About •	paper received ※ 03 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	photon, diagnostics, 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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WEPP038	Observation of Microbunching Instabilities using THz Detector at NSLS-II	detector, synchrotron, synchrotron-radiation, dipole	629
	W.X. Cheng ANL, Lemont, Illinois, USA B. Bacha, G.L. Carr BNL, Upton, New York, USA
	Microbunching instabilities have been observed in several light sources with high single bunch current stored. The instability is typically associated with threshold beam currents. Energy spread and bunch length are increasing above the thresholds. Recently, a terahertz (THz) detector was installed at the cell 22 infrared (IR) beamline at NSLS-II storage ring to study the micro-bunch instabilities. The IR beamline has wide aperture allowing long-wavelength synchrotron radiation or microwave signal propagate to the end station, where the detector was installed. The detector output signal has been analyzed using oscilloscope, spectrum analyzer and FFT real-time spectrum analyzer. Clear sidebands appear as single bunch current increases and the sidebands tend to shift/jump. We present measurement results of the THz detector at different nominal bunch lengths and ID gaps.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP038
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WEPP039	Single-Shot Diagnostics of Microbunched Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers	laser, electron, diagnostics, 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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WEPP046	Technology and First Beam Tests of the New CERN-SPS Beam Position System	electronics, electron, pick-up, controls	655
	M. Wendt, M. Barros Marin, A. Boccardi, T.B. Bogey, I. Degl’Innocenti, A. Topaloudis CERN, Meyrin, Switzerland
	The CERN Super Proton Synchrotron (SPS) uses 215 beam position monitors (BPMs) to observe the beam orbit when accelerating protons or ions on a fast ramp cycle to beam energies of up to 450 GeV/c. In the frame of the CERN LHC Injector Upgrade (LIU) initiative the aged, and diffi- cult to maintain homodyne-receiver based BPM read-out system is currently being upgraded with A Logarithmic Po- sition System ¿ ALPS. As the name indicates, this new BPM electronics builds upon the experience at CERN with using logarithmic detector amplifiers for beam position processing, and is well suited to cover the large range of beam intensities accelerated in the SPS. The system will use radiation toler- ant electronics located in close proximity to the split-plane or stripline beam position monitor with GB/s optical data transmission to the processing electronics located on the surface. Technical details of the analog and digital signal processing, the data transmission using optical fibers, cal- ibration and testing, as well as first beam tests on a set of ALPS prototypes are presented in this paper.
	Poster WEPP046 [16.711 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP046
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THAO01	Cherenkov Diffraction Radiation as a tool for beam diagnostics	electron, photon, experiment, diagnostics	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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO01
About •	paper received ※ 09 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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THAO04	Transverse Emittance Measurement using Undulator High Harmonics for Diffraction Limited Storage Rings	undulator, emittance, simulation, electron	674
	K.P. Wootton, J.L. McChesney, F.M. Rodolakis, N. Sereno, 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. A particular challenge for diagnostics in diffraction limited storage ring light sources is the measurement of electron beam transverse emittances. In the present work, we present measurements and simulations of vertical electron beam emittance using high harmonics from an electromagnetic undulator in the present Advanced Photon Source storage ring. Based on these results, using simulation we motivate an undulator-based horizontal and vertical transverse emittance monitor for diffraction limited storage rings, using the Advanced Photon Source Upgrade as an example.
	Slides THAO04 [2.655 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO04
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, diagnostics

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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MOPP004

Development and Calibration of a Multi-Leaf Faraday Cup for the Determination of the Beam Energy of a 50 MeV Electron LINAC in Real-Time

electron, detector, proton, real-time

67

C. Makowski, A. Schüller
PTB, Braunschweig, Germany

The Physikalisch-Technische Bundesanstalt (PTB), Germany’s national primary standard laboratory, operates an electron LINAC with variable energy (0.5 - 50 MeV). All parameters of the LINAC which influence the RF power (as e.g. the high voltage at modulator) as well as the number of charged particles in a bunch to be accelerated (as e.g. via gun emission) also change the beam energy. To measure the energy during the preparation or optimization of a beam, a Multi-Leaf Faraday Cup (MLFC) was developed. This MLFC allows the measurement of energy and pulse charge in real time, so the influence of the manipulated variables on energy and beam power can be immediately assessed. The MLFC consists of 128 electrically isolated Al plates where the thickness of the entire stack is sufficient to stop a 50 MeV electron beam. After each beam pulse, the charge collected by the Al plates is recorded sequentially. The MLFC was calibrated with monoenergetic electron beams at output of a magnetic spectrometer. Then the MLFC was installed at the end of the accelerator structure. From the recorded charge distributions, the corresponding energy is determined in real time and displayed for each beam pulse.

Poster MOPP004 [3.739 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP004

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paper received ※ 30 August 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019

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MOPP005

Radiation hardness investigation of Zinc oxide fast scintillators with relativistic heavy ion beams.

detector, heavy-ion, target, site

71

P. Boutachkov, A. Reiter, M. Saifulin, B. Walasek-Höhne
GSI, Darmstadt, Germany
E.I. Gorokhova
GOI, St Petersburg, Russia
P. Rodnyi, I.D. Venevtsev
SPbPU, St. Petersburg, Russia

At GSI ion beams of many elements, from H up to U, are produced with energy as high as 4.5 GeV/u with the SIS-18 synchrotron. For absolute beam intensity and micro-spill structure measurements a BC400 organic scintillator is used. Due to the low radiation hardness of this material, alternative inorganic scintillators like ZnO:Ga and ZnO:In were investigated. The properties and possible application of these novel radiation hard fast scintillators will be discussed. Their response to Sn, Xe and U ion beams will be reported.

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MOPP012

Development of Compact Ionization Chambers for Particle Therapy Facilities

proton, electronics, electron, high-voltage

100

M. Liu, C.X. Yin
SSRF, Shanghai, People’s Republic of China

Dose monitors and position monitors are critical equipment for particle therapy facilities. Performance of the monitors affects precision of irradiation dose and dose distribution. Parallel plate ionization chambers with free air are adopted for dose monitors and position monitors. Radiation-hardened front-end electronics are integrated in the chambers, and the output of the chambers are digital signals. The structure of the monitors is compact, modularized and easy-to-use. The ionization chambers are implemented successfully in Shanghai Advanced Proton Therapy Facility. The development details and implementation status are presented.

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MOPP014

Design of the ESS MEBT Faraday Cup

electron, MEBT, proton, operation

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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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

FEL, operation, 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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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP019

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MOPP020

First Tests Using Sipm Based Beam Loss Monitors at the European XFEL

FEL, undulator, detector, photon

127

T. Wamsat, P.A. Smirnov
DESY, Hamburg, Germany

The European XFEL MTCA based Beam Loss Monitor System (BLM) is composed of about 450 monitors using photomultiplier tubes (PMTs). BLMs installed in the SASE undulator intersections show high signals at electron energy higher 16 GeV or photon energy higher 14 keV due to background synchrotron radiation which directly affects the PMT. The amplitude of this signal can get that high that, also without using any scintillating material, the BLMs get blind for real losses. Also different lead arrangements did not shield the signal sufficiently. First tests show that a Silicon photomultiplier (SiPM) is not affected. Also there are several advantages to use SiPM, they are cheaper by factor of 40 and operating voltage is below 45V. First test will be presented and how it can get implemented in the existing BLMs and BLM system.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP020

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MOPP042

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

diagnostics, target, beam-diagnostic, 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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TUAO02

Beam-Loss Detection for LCLS-II

detector, linac, gun, electron

229

A.S. Fisher, C.I. Clarke, B.T. Jacobson, R.A. Kadyrov, E. Rodriguez, L. Sapozhnikov, J.J. Welch
SLAC, Menlo Park, California, USA

SLAC is now installing LCLS-II, a superconducting electron linac driven by continuous RF at 1.3 GHz. The 4-GeV, 120-kW beam has a maximum rate of nearly 1 MHz and can be switched pulse-by-pulse to either of two undulators, to generate hard and soft x rays. Two detector types measure beam losses. Point beam-loss monitors (PBLMs) set limits at critical loss points: septa, beam stoppers and dumps, halo collimators, protection collimators (which normally receive no loss), and zones with weak shielding. PBLMs are generally single-crystal diamond detectors, except at the gun, where a scintillator on a PMT is more sensitive to the low-energy (1 MeV) beam. Long beam-loss monitors (LBLMs) use 200-m lengths of radiation-hard optical fiber, each coupled to a PMT, to capture Cherenkov light from loss showers. LBLMs protect the entire 4-km path from gun to beam dump and locate loss points. In most regions two fibers provide redundancy and view the beam from different angles. Loss signals are integrated with a 500-ms time constant and compared to a threshold; if exceeded, the beam is stopped within 0.2 ms. We report on our extensive tests of the detectors and the front-end signal processing.

Slides TUAO02 [4.268 MB]

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TUAO03

Beam Loss Measurements Using the Cherenkov Effect in Optical Fiber for the BINP e⁻e⁺ Injection Complex

electron, extraction, beam-losses, injection

233

Yu.I. Maltseva, A.R. Frolov, V.G. Prisekin
BINP SB RAS, Novosibirsk, Russia

Optical fiber based beam loss monitor (OFBLM) has been developed for the 500 MeV BINP Injection Complex (IC). Such monitor is useful for accelerator commissioning and beam alignment, and allows real-time monitoring of e⁻e⁺ beam loss position and intensity. Single optical fiber (OF) section can cover the entire accelerator instead of using a large number of local beam loss monitors. In this paper brief OFBLM selection in comparison with other distributed loss monitors was given. Methods to improve monitor spatial resolution are discussed. By selecting 45 m long silica fiber (with a large core of 550 um) and microchannel plate photomultiplier (MCP-PMT), less than 1 m spatial resolution can be achieved.

Slides TUAO03 [3.053 MB]

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TUBO01

Screens for High Precision Measurements

electron, diagnostics, 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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TUCO02

Experimental Observation of Submillimeter Coherent Cherenkov Radiation at CLARA Facility

experiment, electron, detector, target

261

K.V. Fedorov, P. Karataev, A.N. Oleinik
JAI, Egham, Surrey, United Kingdom
K.V. Fedorov, A. Potylitsyn, A. Potylitsyn
TPU, Tomsk, Russia
P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom
A.N. Oleinik
BelSU, Belgorod, Russia
T.H. Pacey, Y.M. Saveliev
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
T.H. Pacey
UMAN, Manchester, United Kingdom
Y.M. Saveliev
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Nowadays, the method of longitudinal beam profile diagnostic based on transition radiation (TR) spectrum is well studied [1] and is constantly being applied, while using of coherent Cherenkov radiation (CCR) is a modern task that opens up new possibilities in this area [2]. In current work we conducted experiments on CCR generation, observation and it further spectral analysis at 0.1-30 THz spectral range. All experimental work was at CLARA (beam area 1) facility (~50 MeV beam energy at up to 10 Hz pulse repetition rate with sub-ps bunch length). Inside of vacuum chamber we developed movable platform where both VCR and TR target were placed, which is allows us to observe both effects during one accelerator run. For spectral analysis we used Martin-Pupplet interferometer as it provides higher signal to noise ratio and allows us to perform instabilities normalisation. As a result we will demonstrate a selection of interferograms and spectrums (as well as reconstructed longitudinal beam profiles) for different machine setups and distances between charged particle beam and Cherenkov target. By using mathematical analysis it has been shown that CLARA bunch length was about 1.2 ps.

Slides TUCO02 [22.952 MB]

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TUPP001

KALYPSO: Linear Array Detector with Continuous Read-Out at MHz Frame Rates

FEL, detector, electron, laser

271

C. Gerth, B. Steffen
DESY, Hamburg, Germany
M. Caselle, L. Rota
KIT, Karlsruhe, Germany
D.R. Makowski, A. Mielczarek
TUL-DMCS, Łódź, Poland

The novel linear array detector KALYPSO has been developed for beam diagnostics based on 1-dimensional profile measurements at high-repetition rate free-electron lasers (FEL) and synchrotron radiation facilities. The current version of KALYPSO has 256 pixels with a maximum frame rate of 2.7~MHz. The detector board, which comprises the radiation sensor, analog signal amplification, and analog-to-digital signal conversion, has been designed as a mezzanine card that can be plugged onto application-specific carrier boards for data pre-processing and transmission. Either a Si or InGaAs sensor can be mounted for the detection of visible or near infrared radiation. Results obtained in several beam diagnostics applications at the European XFEL and FLASH are presented to demonstrate the powerful capabilities of the KALYPSO detector.
* The KAYLYPSO detector is a collaboration between the Karlsruhe Institute of Technology, Paul Scherrer Institut, Łódź University of Technology, and Deutsches-Elektronen Synchrotron.

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paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019

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TUPP007

Transverse Phase Space Scanner Developments at IPHC

emittance, neutron, electron, ECR

293

F.R. Osswald, T. Adam, P.G. Graehling, M. Heine, C. Maazouzi, E.K. Traykov
IPHC, Strasbourg Cedex 2, France

Emittance characterization of charged particle beams is a standard and important tool to assess the performances of a facility. Due to emittance growth, beam losses and space charge the measurement of the transverse phase space distributions of the charged particles is still an up-to-date issue even at low energy and for wide beams. It enables detailled characterization of particle position and incidence in addition to other diagnostics. It gives access to the particles distribution at the boarder, a region of lower density important for high power accelerators and high intensity radioactive beams as they request reduced losses and damages thus less contaminated parts and nuclear waste for a safe handling during maintenance. Transverse Phase Space Scanners are designed at IPHC and based on the Allison system. They are currently used on different injection channels of large facilities as SPIRAL 2 and FAIR and will be used in the future on the DC280/SHE facility at JINR. A review of the IPHC’s high resolution scanner design, development programme and future challenges are presented espacially for beam halo analysis and "loss less" beam transport lines.

Poster TUPP007 [1.475 MB]

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TUPP008

Thermal Simulations of Optical Transition Radiation Targets

target, linac, emittance, simulation

297

J. Pforr, M. Arnold, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by DFG through GRK 2128
The recirculating electron linac S-DALINAC* provides beams with currents up to 20 µA and energies up to 130 MeV. It is planned to extend the beam diagnostics by adding multiple emittance measurement systems in order to investigate the emittance evolution along the beamline. The emittance measurement is based on the quadrupole scan technique and utilizes the existing quadrupoles and newly built optical transition radiation targets. As the targets are heated by the beam and destruction must be avoided, simulations of the thermal behaviour of the target were conducted. In particular, the dependence of the target temperature on the target design, but also variable parameters as beam spot size and current were investigated. This contribution will present these parameter studies.
* N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)

Poster TUPP008 [1.114 MB]

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TUPP009

Determination of the Momentum Spread While Running in the ERL Mode at the S-DALINAC*

linac, electron, recirculation, quadrupole

300

F. Schließmann, M. Arnold, M. Dutine, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: *Work supported by DFG through GRK 2128 and BMBF through grant No. 05H18RDRB2
The recirculating superconducting electron accelerator S-DALINAC [1] at TU Darmstadt is capable to run as a onefold or twofold Energy Recovery Linac (ERL) with a maximum energy of approximately 34 or 68 MeV in ERL mode, respectively. After the final acceleration in ERL mode, the momentum spread at the intended interaction point has to be determined. In order to investigate that momentum spread, a nondestructive measurement method is necessary. For this reason, it is planned to expand the beam horizontally in a section close to the interaction point by providing a well-defined horizontal dispersion. Using a wire scanner in this section for measuring the horizontal profile of the electron distribution, one can determine the momentum spread. The method of determining the momentum spread using the horizontal dispersion and the design of the wire scanner will be presented in this contribution.
[1] N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018).

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TUPP012

Image of the Transverse Bunch Profile via COTR

electron, laser, target, simulation

313

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

Funding: This work was supported by the grant of the Russian Ministry of Science # 3/1903.2017.
Transverse beam profile diagnostics based on Optical Transition Radiation (OTR) is a routine technique at most modern electron linear accelerators (linacs) which is difficult to implement for FEL beams [*] and LWPA accelerators [**]. The reason is that a standard OTR beam profile monitor with a few micrometers space resolution cannot be used for measurements of ultrashort bunch profiles due to coherent effects in the OTR emission process [***]. We have developed an approach which allows calculating the propagation of coherent optical transition radiation (COTR) through a standard optical system consisting of a focusing lens and a spatial resolving detector placed in the image plane. Strict summation of the OTR fields emitted coherently by electrons inside the bunch and its focusing onto the detector plane allows obtaining a COTR image of the bunch profile. With the assumption of a Gaussian transverse bunch profile it is shown that the resulting image has a typical "ring" shape, characteristics of which are depended on the bunch transverse rms size and optical system parameters.
* E. Saldin, et al., "The Physics of Free Electron Lasers", Springer-Verlag, 2010.
** N. Bourgeois, et al., AIP Conf. Proc., 1507, 258 (2012).
*** H. Loos, R. Akre, et al., SLAC-PUB-13395 (2008).

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TUPP017

Thermal Performance of Diamond SR Extraction Mirrors for SuperKEKB

extraction, MMI, optics, electron

332

J.W. Flanagan, M. Arinaga, H. Fukuma, H. Ikeda, G. Mitsuka, Y. Suetsugu
KEK, Ibaraki, Japan
E. Mulyani
BATAN, Yogyakarta, Indonesia
E. Mulyani
Sokendai, Ibaraki, Japan

The SuperKEKB accelerator is a high-current, low-emittance upgrade to the KEKB double ring collider. The beryllium extraction mirrors used for the synchrotron radiation (SR) monitors at KEKB suffered from heat distortion due to incident SR, leading to systematic changes in magnification with beam current, and necessitating continuous monitoring and compensation of such distortions in order to correctly measure the beam sizes.* To minimize such mirror distortions, quasi-monocrystalline CVD diamond mirrors have been designed and installed at SuperKEKB.** Diamond has a very high heat conductance and a low thermal expansion coefficient. With such mirrors it is hoped to reduce the beam current-dependent magnification to the level of a few percent at SuperKEKB. Preliminary measurements of mirror distortion during SuperKEKB commissioning show very promising results with regard to thermal performance, though full beam currents have not yet been stored in the SuperKEKB rings. Measurements of the thermal deformation of the diamond mirrors will be presented in this paper, along with a description of the design of the mirrors and their mounts, and issues encountered during commissioning.
*M. Arinaga et al., NIM, A499, p. 100 (2003).
**J.W. Flanagan et al., "Diamond mirrors for the SuperKEKB synchrotron radiation monitors," Proc. IBIC2012, Tsukuba, Japan p. 515 (2012).

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TUPP030

Analysis of Heavy Ion Irradiation Field Nonuniformity Using Track Detectors during Electronic Components Testing

heavy-ion, detector, electron, experiment

381

A.S. Bychkov, P.A. Chubunov, A.S. Konyukhov, A.A. Pavlov
ISDE, Moscow, Russia

Determining the applicability of electronic components in spacecrafts involves conducting the tests using heavy ions. The Branch of URSC - ISDE and FLNR of JINR have created and operate the only in Russia test facilities based on the FLNR JINR accelerators allowing for heavy ion irradiation over a large area up to 200x200 mm. During simultaneous irradiation of several electronic components with heavy ions, it is necessary to ensure the device under test (DUT) location within the area of minimal nonuniformity. This problem is being solved by pretest determination of the irradiation field nonuniformity for each type of ion (Ne, Ar, Kr, Xe, Bi) and nonuniformity validation every 12 hours. Fluence is determined by a metrologically certified method using track detectors. In order to visualize the irradiation field nonuniformity, additional experiments were carried out with the irradiation of track detec-tors covering the entire irradiation area for each ion species. Based on the data obtained, a map of nonuniformity was plotted, which allows us to conclude that nonuniformity does not exceed 10% in the most frequently used areas of the irradiation field (100x150 mm) during SEE testing.

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TUPP031

Electron Beam Size Measurements Using the Heterodyne Near Field Speckles at ALBA

experiment, synchrotron, undulator, synchrotron-radiation

383

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

Experiments using the heterodyne near field speckle method (HNFS) have been performed at ALBA to characterize the spatial coherence of the synchrotron radiation, with the ultimate goal of measuring both the horizontal and vertical electron beam sizes. The HNFS technique consists on the analysis of the interference between the radiation scattered by a colloidal suspension of nanoparticles and the synchrotron radiation, which in this case corresponds to the hard x-rays (12keV) produced by the in-vacuum undulator of the NCD-Sweet beamline. This paper describes the fundamentals of the technique, possible limitations, and shows the first experimental results changing the beam coupling of the storage ring.

Poster TUPP031 [2.093 MB]

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TUPP042

Turn-by-Turn Synchrotron Radiation Transverse Profile Monitor for IOTA

experiment, optics, electron, lattice

432

N. Kuklev, Y.K. Kim
University of Chicago, Chicago, Illinois, USA

Funding: Work supported by National Science Foundation award PHY-1549132, the Center for Bright Beams. Fermi Research Alliance operates Fermilab under Contract DE-AC02-07CH11359 with the US Dept. of Energy.
The Integrable Optics Test Accelerator is a research electron and proton storage ring recently commissioned at Fermilab. A key part of its beam diagnostics suite are synchrotron radiation monitors, used for measuring transverse beam profile, position, and intensity. So far, this system has used only visible light cameras, which are optimal for orbit measurements but do not provide turn-by-turn temporal resolution needed for beam dynamics analysis. Current electrostatic BPM system, while capable of turn-by-turn acquisition, will be pushed to its limits of accuracy and linearity by the requirements of planned nonlinear integrable optics experiments, and furthermore does not provide transverse profile data. To address these drawbacks, we present in this paper the design of a turn-by-turn BPM system based on a multi-anode photomultiplier detector. Extensive simulations are shown, combining both particle and optics tracking. A potential hardware and readout architecture is described. Statistical and systematic errors are explored. We conclude by outlining the prototype testing plans for run 2 in the fall of 2019, and other future work.

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paper received ※ 11 September 2019 paper accepted ※ 12 September 2019 issue date ※ 10 November 2019

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WEPP026

Electron Bunch Compression Monitors for Short Bunches - Commissioning Results from SwissFEL

electron, FEL, linac, detector

578

F. Frei, R. Ischebeck
PSI, Villigen PSI, Switzerland

In SwissFEL, by using three magnetic chicanes, 3ps long electron bunches can by compressed by a factor of more than 100 down to a few fs in order to generate ultra short X-ray pulses. In order to meet the envisaged beam performance, noninvasive longitudinal diagnostic after each compression stage is essential. These bunch compression monitors measure relative bunch length changes on a shot-to-shot basis by detecting coherent edge, synchrotron or diffraction radiation emitted by the electron bunches. While after the first two magnetic chicanes, a wide spectral part is integrated on a single broadband detector, an infrared spectrometer installed after the third magnetic chicane is providing more detailed information. Here, we will mainly report on commissioning results of the third bunch compression monitor for electron bunches of a few fs.

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WEPP037

First Measurements of Cherenkov-Diffraction Radiation at Diamond Light Source

photon, diagnostics, 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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WEPP038

Observation of Microbunching Instabilities using THz Detector at NSLS-II

detector, synchrotron, synchrotron-radiation, dipole

629

W.X. Cheng
ANL, Lemont, Illinois, USA
B. Bacha, G.L. Carr
BNL, Upton, New York, USA

Microbunching instabilities have been observed in several light sources with high single bunch current stored. The instability is typically associated with threshold beam currents. Energy spread and bunch length are increasing above the thresholds. Recently, a terahertz (THz) detector was installed at the cell 22 infrared (IR) beamline at NSLS-II storage ring to study the micro-bunch instabilities. The IR beamline has wide aperture allowing long-wavelength synchrotron radiation or microwave signal propagate to the end station, where the detector was installed. The detector output signal has been analyzed using oscilloscope, spectrum analyzer and FFT real-time spectrum analyzer. Clear sidebands appear as single bunch current increases and the sidebands tend to shift/jump. We present measurement results of the THz detector at different nominal bunch lengths and ID gaps.

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WEPP039

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

laser, electron, diagnostics, 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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WEPP046

Technology and First Beam Tests of the New CERN-SPS Beam Position System

electronics, electron, pick-up, controls

655

M. Wendt, M. Barros Marin, A. Boccardi, T.B. Bogey, I. Degl’Innocenti, A. Topaloudis
CERN, Meyrin, Switzerland

The CERN Super Proton Synchrotron (SPS) uses 215 beam position monitors (BPMs) to observe the beam orbit when accelerating protons or ions on a fast ramp cycle to beam energies of up to 450 GeV/c. In the frame of the CERN LHC Injector Upgrade (LIU) initiative the aged, and diffi- cult to maintain homodyne-receiver based BPM read-out system is currently being upgraded with A Logarithmic Po- sition System ¿ ALPS. As the name indicates, this new BPM electronics builds upon the experience at CERN with using logarithmic detector amplifiers for beam position processing, and is well suited to cover the large range of beam intensities accelerated in the SPS. The system will use radiation toler- ant electronics located in close proximity to the split-plane or stripline beam position monitor with GB/s optical data transmission to the processing electronics located on the surface. Technical details of the analog and digital signal processing, the data transmission using optical fibers, cal- ibration and testing, as well as first beam tests on a set of ALPS prototypes are presented in this paper.

Poster WEPP046 [16.711 MB]

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THAO01

Cherenkov Diffraction Radiation as a tool for beam diagnostics

electron, photon, experiment, diagnostics

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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THAO04

Transverse Emittance Measurement using Undulator High Harmonics for Diffraction Limited Storage Rings

undulator, emittance, simulation, electron

674

K.P. Wootton, J.L. McChesney, F.M. Rodolakis, N. Sereno, 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.
A particular challenge for diagnostics in diffraction limited storage ring light sources is the measurement of electron beam transverse emittances. In the present work, we present measurements and simulations of vertical electron beam emittance using high harmonics from an electromagnetic undulator in the present Advanced Photon Source storage ring. Based on these results, using simulation we motivate an undulator-based horizontal and vertical transverse emittance monitor for diffraction limited storage rings, using the Advanced Photon Source Upgrade as an example.

Slides THAO04 [2.655 MB]

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