IBIC2016 - List of Keywords (detector)

Paper	Title	Other Keywords	Page
MOAL03	Beam Commissioning of SuperKEKB Rings at Phase 1	feedback, operation, injection, damping	6
	M. Tobiyama, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, K. Mori, E. Mulyani, M. Tejima KEK, Ibaraki, Japan G. Bonvicini Wayne State University, Detroit, Michigan, USA E. Mulyani Sokendai, Ibaraki, Japan G.S. Varner University of Hawaii, Honolulu,, USA
	The Phase 1 commissioning of SuperKEKB rings with-out superconducting final focus magnets or Belle-II de-tector began in Feb., 2016. A total of 10¹⁰ mA (LER) and 870 mA (HER) stored beam has been achieved close to the design emittance and x-y coupling. Most of the beam diagnostics, including new systems such as gated turn-by-turn monitors and X-ray beam size monitors, have been commissioned with beam and proved to be essential to the success of machine commissioning. The results of the beam commissioning, including the evaluation and diffi-culties of the beam diagnostics are shown.
	Slides MOAL03 [9.607 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOAL03
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MOPG07	First Operational Experience with the LHC Diode ORbit and OScillation (DOROS) System	electronics, embedded, FPGA, coupling	43
	M. Gąsior, G. Baud, J. Olexa, G. Valentino CERN, Geneva, Switzerland
	The LHC started high-energy operation in 2015 with new tertiary collimators, equipped with beam position monitors embedded in their jaws. The required resolution and stability of the beam orbit measurements linked to these BPMs were addressed by the development of a new Diode ORbit and OScillation (DOROS) system. DOROS converts the short BPM electrode pulses into slowly varying signals by compensated diode detectors, whose output signals can be precisely processed and acquired with 24-bit ADCs. This scheme allows a sub-micrometre orbit resolution to be achieved with robust and relatively simple hardware. The DOROS system is also equipped with dedicated channels optimised for processing beam oscillation signals. Data from these channels can be used to perform betatron coupling and beta-beating measurements. The achieved performance of the DOROS system triggered its installation on the beam position monitors located next to the LHC experiments for testing the system as an option of improving the beam orbit measurement in the most important LHC locations. After introducing the DOROS system, its performance is discussed through both, beam and laboratory measurements.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG07
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MOPG10	BPM Stabiltiy Studies for the APS MBA Upgrade	ground-motion, diagnostics, vacuum, experiment	55
	R.M. Lill, N. Sereno, B.X. Yang ANL, Argonne, Illinois, USA
	Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source (APS) is currently in the preliminary design phase for the multi -bend achromat (MBA) lattice upgrade. Beam stability is critical for the MBA and will require long term drift defined as beam motion over a seven-day timescale to be no more than 1 micron at the insertion device locations and beam angle change no more than 0.5 micro-radian. Mechanical stability of beam position monitor (BPM) pickup electrodes mounted on insertion device vacuum chambers place a fundamental limitation on long-term beam stability for insertion device beamlines. We present the design and implementation of using prototype mechanical motion system (MMS) instrumentation for quantifying this type of motion specifically in the APS accelerator tunnel and experiment hall floor under normal operating conditions. The MMS presently provides critical position information on the vacuum chamber and BPM support systems. Initial results of the R&D prototype systems have demonstrated that the chamber movements far exceed the long-term drift tolerance specified for the APS Upgrade MBA storage ring.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG10
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MOPG14	The Use of Single-crystal CVD Diamond as a Position Sensitive X-ray Detector	synchrotron, photon, radiation, diagnostics	71
	E. Griesmayer, P. Kavrigin, Ch. Weiss CIVIDEC Instrumentation, Wien, Austria C. Bloomer DLS, Oxfordshire, United Kingdom
	Synchrotron light sources generate intense beams of X-ray light for beamline experiments, and the stability of these X-ray beams has a large impact on the quality of the experiments that can be performed. User experiments increasingly utilise micro-focus techniques, focusing the X-ray beam size to below 10 microns at the sample point, with beamline detectors operating at kHz bandwidths. Thus, there is a demand for non-invasive diagnostic techniques that can reliably monitor the X-ray beam position with sub-micron accuracy in order to characterise X-ray beam motion, at corresponding kHz bandwidths. Reported in this paper are measurements from single-crystal CVD diamond detectors, and a comparison with the previous-generation of polycrystalline CVD diamond detectors is offered. Single-crystal diamond is shown to offer superior uniformity of response to incident X-rays, and excellent intensity and position sensitivity. Measurements from single-crystal diamond detectors installed at Diamond Light Source are presented, and their use in feedback routines in order to stabilise the X-ray beam at the sample point is discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG14
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MOPG19	Diamond Monitor Based Beam Loss Measurements in the LHC	injection, software, instrumentation, data-acquisition	82
	C. Xu, B. Dehning, F.S. Domingues Sousa CERN, Geneva, Switzerland E. Griesmayer CIVIDEC Instrumentation, Wien, Austria
	Two pCVD diamond based beam loss monitors (dBLM) are installed near the primary collimators of the LHC, with a dedicated, commercial readout-system used to acquire their signals. The system is simultaneously able to produce a high sampling rate waveform and provide a real-time beam loss histogram for all bunches in the machine. This paper presents the data measured by the dBLM system during LHC beam operation in 2016.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG19
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MOPG20	Optimized Beam Loss Monitor System for the ESRF	injection, electron, controls, vacuum	86
	K.B. Scheidt, F. Ewald ESRF, Grenoble, France P. Leban I-Tech, Solkan, Slovenia
	Monitoring of the 6 GeV electron losses around the ESRF storage ring is presently done by a hybrid system consisting of ionization chambers and scintillators. It allows a rough localization of the losses, but has numerous limitations : size, weight, time-resolution, sensitivity, versatility, and costs. A new system was developed consisting of a detector head (BLD) and the electronics for signal acquisition and control (BLM). The BLD is compact, based on a scintillator coupled to a small photo-multiplier module. The BLM controls 4 independent BLDs and acquires data with sampling rates up to 125 MHz. Measurements performed on different configurations of BLD prototypes have lead to an optimized design that allows, together with the flexible signal processing performed in the BLM, to cover a wide range of applications: measurement of fast and strong losses during injection is just as well possible as detection of very small variations of weak losses during the slow current decay. This paper describes the BLD/BLM design, its functionality and performance characteristics, and shows results from prototypes installed in the injection zone and in close vicinity to in-vacuum undulators.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG20
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MOPG21	Development of a Method for Continuous Functional Supervision of BLM Systems	monitoring, high-voltage, operation, electronics	90
	C.F. Hajdu, C. Zamantzas CERN, Geneva, Switzerland T. Dabóczi, C.F. Hajdu BUTE, Budapest, Hungary
	It is of vital importance to provide a continuous and comprehensive overview of the functionality of beam loss monitoring (BLM) systems, with particular emphasis on the connectivity and correct operation of the detectors. At CERN, a new BLM system for the pre-accelerators of the LHC is currently at an advanced stage of development. This contribution reports on a new method which aims to automatically and continuously ensure the proper connection and performance of the detectors used in the new BLM system.
	Poster MOPG21 [0.337 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG21
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MOPG22	Studies and Historical Analysis of ALBA Beam Loss Monitors	vacuum, storage-ring, injection, operation	94
	A.A. Nosych, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	During 5 years of operation in the 3 GeV storage ring of ALBA, the 124 beam loss monitors (BLM) have provided stable measurements of relative losses around the machine, with around 10% breakdown of units. We have analyzed these BLM failures and correlated the integrated received dose with any special conditions of each BLM location which might have led to their breakdown. We also show studies of beam losses in the insertion devices, with particular attention to the results in the multipole wiggler (MPW), where the vacuum chamber is (suspected to be) misaligned and high BLM counts are detected.
	Poster MOPG22 [16.015 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG22
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MOPG27	The Design, Construction and Operation of the Beam Instrumentation for the High Intensity and Energy Upgrade of ISOLDE at CERN	diagnostics, target, cryomodule, operation	101
	W. Andreazza, E. Bravin, E.D. Cantero, S. Sadovich, A.G. Sosa, R. Veness CERN, Geneva, Switzerland J.M. Carmona, J.H. Galipienzo, P.N.G. Noguera Crespo AVS, Elgoibar, Spain
	The High Intensity and Energy (HIE) upgrade to the on-line isotope separation facility (ISOLDE) facility at CERN is currently in the process of being commissioned. The very tight space available between the superconducting acceleration cavities and a challenging specification led to the design of a compact 'diagnostic box' with a number of insertable instruments on a common vacuum chamber. The box was conceived in partnership with the engineering firm AVS and produced as a completed assembly in industry. 14 diagnostic boxes have been installed and are now operational. This paper will describe the design, the construction and first results from operation of these HIE ISOLDE diagnostic boxes.
	Poster MOPG27 [0.744 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG27
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MOPG36	Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector	timing, simulation, radiation, photon	123
	J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei NUAA, Nanjing, People's Republic of China
	The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range. L. Karsch, A. Bohm et al, "Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.
	Poster MOPG36 [5.665 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG36
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MOPG42	Test Results from the Atlas Hybrid Particle Detector Prototype	ion, electron, radiation, cathode	147
	C. Dickerson, B. DiGiovine, L.Y. Lin ANL, Argonne, Illinois, USA D. Santiago-Gonzalez LSU, Baton Rouge, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. At the Argonne Tandem Linear Accelerator System (ATLAS) we designed and built a hybrid particle detector consisting of a gas ionization chamber followed by an inorganic scintillator. This detector will aid the tuning of low intensity beam constituents, typically radioactive, with relatively high intensity (>100x) contaminants. These conditions are regularly encountered during radioactive ion beam production via the in-flight method, or when charge breeding fission fragments from the CAlifornium Rare Isotope Breeder Upgrade (CARIBU). The detector was designed to have an energy resolution of ~5% at a rate of 10⁵ particles per second (pps), to generate energy loss and residual energy signals for the identification of both Z and A, to be compact (retractable from the beamline), and to be radiation hard. The combination of a gas ionization chamber and scintillator will enable the detector to be very versatile and be useful for a wide range of masses and energies. Design details and testing results from the prototype detector are presented in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG42
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MOPG57	Temperature and Humidity Drift Characterization of Passive RF Components for a Two-Tone Calibration Method	laser, injection, radio-frequency, hardware	194
	E. Janas, K. Czuba Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland E. Janas, U. Mavrič, H. Schlarb DESY, Hamburg, Germany
	Femtosecond-level synchronization is required for various systems in modern accelerators especially in fourth generation light sources. In those high precision synchronization systems the phase detection accuracy is crucial. However, synchronization to a low noise electrical source is corrupted by a phase detection error originating in the electrical components and connections due to thermal and humidity-related drifts. In future, we plan to implement calibration methods to mitigate these drifts. Those methods require a calibration signal injection, called second tone, into the system. Intrinsically, the injection circuit remains uncalibrated therefore it needs to be drift-free. We performed drift characterization of a set of RF components, which could serve for implementation of a signal injection circuit, namely selected types of couplers and splitters. We describe the measurement setup and discuss the challenges associated with this kind of measurement. Finally, we provide a qualitative and quantitative evaluation of the measurements results.
	Poster MOPG57 [2.823 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG57
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MOPG58	Coherent Diffraction Radiation Imaging Methods to Measure RMS Bunch	electron, radiation, experiment, simulation	198
	R.B. Fiorito, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom C.I. Clarke, A.S. Fisher SLAC, Menlo Park, California, USA A.G. Shkvarunets UMD, College Park, Maryland, USA
	The measurement of the RMS bunch length with high resolution is very important for latest generation light sources and also a key parameter for the optimization of the final beam quality in high gradient plasma accelerators. In this contribution we present progress in the development of novel single shot, RMS bunch length diagnostic techniques based on imaging the near and far fields of coherent THz diffraction radiation (CTHzDR) that is produced as a charged particle beam interacts with a solid foil or an aperture. Recent simulation results show that the profile of a THz image of the coherent point spread function (CSF) of a beam whose radius is less than the PSF, i.e. the image produced by a single electron, is sensitive to bunch length and can thus be used as a diagnostic. The advantages and disadvantages of near field and far field imaging are examined and the results of a recent high energy (20 GeV) CTHzDR experiments at SLAC/FACET are presented. Plans for experiments to further validate and compare these imaging methods for both moderate and high energy charged particle beams are also discussed.
	Poster MOPG58 [1.067 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG58
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MOPG59	Time Correlated Single Photon Counting Using Different Photon Detectors	photon, operation, synchrotron, radiation	201
	L. Torino, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	Time Correlated Single Photon Counting (TCSPC) is used in accelerators to measure the filling pattern and perform bunch purity measurements. The most used photon detectors are photomultipliers (PMTs), generally used to detect visible light; and Avalanche Photo-Diodes (APDs), which are often used to detect X-rays. At ALBA synchrotron light source, the TCSPC using a standard PMT has been developed and is currently in operation and further tests are performed using an APD. This work presents the experimental results using both detectors, and compares their performances.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG59
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MOPG62	Novel Grating Designs for a Single-Shot Smith-Purcell Bunch Profile Monitor	radiation, electron, vacuum, background	213
	A.J. Lancaster, G. Doucas, H. Harrison, I.V. Konoplev JAI, Oxford, United Kingdom
	Funding: This work was supported by the STFC UK (grant ST/M003590/1) and the Leverhulme Trust (International Network Grant IN-2015-012). H. Harrison is supported by STFC UK and the JAI for her DPhil. Smith-Purcell radiation has been successfully used to perform longitudinal profile measurements of electron bunches with sub-ps lengths. These measurements require radiation to be generated from a series of gratings to cover a sufficient frequency range for accurate profile reconstruction. In past systems the gratings were used sequentially and so several bunches were required to generate a single profile, but modern accelerators would benefit from such measurements being performed on a bunch by bunch basis. To do this the radiation from all three gratings would need to be measured simultaneously, increasing the mechanical complexity of the device as each grating would need to be positioned individually and at a different azimuthal angle around the electron beam. Investigations into gratings designed to displace the radiation azimuthally will be presented. Such gratings could provide an alternative to the rotated-grating approach, and would simplify the design of the single-shot monitor by reducing the number of motors required as all of the gratings could be positioned using a single mount.
	Poster MOPG62 [1.088 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG62
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MOPG65	Frascati Beam-Test Facility (BTF) High Resolution Beam Spot Diagnostics	electron, real-time, diagnostics, software	221
	P. Valente INFN-Roma, Roma, Italy B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta INFN/LNF, Frascati (Roma), Italy
	Funding: Istituto Nazionale di Fisica Nucleare. Supported by the H2020 project AIDA-2020, GA no. 654168 The DAΦNE Beam Test Facility (BTF) is operational in Frascati since 2003. In the last years the beam diagnostics tools have been completely renewed and the services for users have been largely improved. We describe here the new transverse beam diagnostics based on new GEM TPC detectors and MEDIPIX Silicon pixel detectors, the renewed DAQ system and the data caching system based on MEMCACHED and the integration of the new sub-systems in the new data-logging. Results on the optimization of the transverse beam spot and divergence are reported as well as the real-time diagnostics and feedback user experience.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG65
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MOPG68	Development and Commissioning of the Next Generation X-ray Beam Size Monitor in CESR	operation, vacuum, alignment, storage-ring	229
	N.T. Rider, S.T. Barrett, M.G. Billing, J.V. Conway, B.K. Heltsley, A.A. Mikhailichenko, D.P. Peterson, D. L. Rubin, J.P. Shanks, S. Wang Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: Work supported by NSF grant PHY-0734867, PHY-1002467 and DOE grant DE-FC02-08ER41538, DE-SC0006505 The CESR Test Accelerator (CesrTA) program targets the study of beam physics issues relevant to linear collider damping rings and other low emittance storage rings. This endeavor requires new instrumentation to study the beam dynamics along trains of ultra-low emittance bunches. A key element of the program has been the design, commissioning and operation of an x-ray beam size monitor capable, on a turn by turn basis, of collecting single pass measurements of each individual bunch in a train over many thousands of turns. The x-ray beam size monitor development has matured to include the design of a new instrument which has been permanently integrated into the storage ring. A new beam line has been designed and constructed which allows for the extraction of x-rays from the positron beam using a newly developed electro magnet pair. This new instrument utilizes custom, high bandwidth amplifiers and digitization hardware and firmware to collect signals from a linear InGaAs diode array. This paper reports on the development of this new instrument and its integration into storage ring operation including vacuum component design, electromagnet design, electronics and capabilities.
	Poster MOPG68 [4.624 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG68
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MOPG75	Single Shot Transversal Profile Monitoring of Ultra Low Charge Relativistic Electron Bunches at REGAE	electron, background, coupling, photon	257
	H. Delsim-Hashemi DESY, Hamburg, Germany
	Relativistic electron microscopes are increasingly under consideration in dream experiments of observing atomic scale motions as they occur. Compared to ordinary electron microscopes with energies limited to few tens of keV, relativistic electrons reduce strongly the space-charge effects. This enables packing more electrons in shorter bunches and thereby capturing atomic scale ultra-fast dynamics in single shot. A typical relativistic-electron-microscope, based on an RF-gun, can provide experiments with couple of thousands to millions of electrons bunched in a few μm length and a transversal dimension of a fraction of a mm. After scattering from a sample and at the position of detector, electrons are distributed over transversal dimensions typically two orders of magnitude larger. For transversal diagnostics before scattering a cost effective solution is implemented while for diffraction pattern detection objective is single-electron imaging with good signal to noise ratio in single shot. In this contribution the implementations and results at REGAE will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG75
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MOPG76	A Scintillating Fibre Beam Profile Monitor for the Experimental Areas of the SPS at CERN	ion, photon, radiation, proton	261
	I. Ortega Ruiz, J. Spanggaard, G. Tranquille CERN, Geneva, Switzerland A. Bay, G.J. Haefeli EPFL, Lausanne, Switzerland
	The CERN Super Proton Synchrotron (SPS) delivers a wide spectrum of particle beams (hadrons, leptons and heavy ions) that can vary greatly in momentum and intensity. The profile and position of these beams are measured using particle detectors. However, the current systems show several problems that limit the quality of such monitoring. We have researched a new monitor made of scintillating fibres read-out with Silicon Photomultipliers (SiPM), which has the potential to perform better in terms of material budget, range of intensities measured and available detector size. In addition, it also has particle counting capabilities, extending its use to spectrometry or Time-Of-Flight measurements. Its radiation hardness is good to guarantee years of functioning. We have successfully tested a first prototype of this detector with different particle beams at CERN, giving accurate profile measurements over a wide range of energies and intensities. It only showed problems during operation with lead ion beams, believed to come from crosstalk between the fibres. Investigations are ongoing on alternative photodetectors, the electronics readout and solutions to the fibre crosstalk.
	Poster MOPG76 [2.611 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG76
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TUAL02	A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity	neutron, photon, simulation, electron	277
	J. Marroncle, A. Delbart, D. Desforge, C.L.H. Lahonde-Hamdoun, Ph. Legou, T. Papaevangelou, L. Segui, G. Tsiledakis CEA/IRFU, Gif-sur-Yvette, France
	Superconductive accelerators may emit X-rays and Gammas mainly due to high electric fields applied on the superconductive cavity surfaces. Indeed, electron emissions will generate photons when electrons impinge on some material. Their energies depend on electron energies, which can be strongly increased by the cavity radio frequency power when it is phase-correlated with the electrons. Such photons present a real problem for Beam Loss Monitor (BLM) systems since no discrimination can be made between cavity contributions and beam loss contributions. Therefore, a new BLM is proposed which is based on gaseous Micromegas detectors, highly sensitive to fast neutrons, not to thermal ones and mostly insensitive to X-rays and Gammas. This detector uses Polyethylene for neutron moderation and the detection is achieved using a 10B or 10B4C converter film with a Micromegas gaseous amplification. Simulations show that detection efficiencies > 8 % are achievable for neutrons with energies between 1 eV and 10 MeV.
	Slides TUAL02 [1.248 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUAL02
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TUBL03	Synchronous Laser-Microwave Network for Attosecond-Resolution Photon Science	timing, laser, network, polarization	286
	K. Shafak, F.X. Kärtner, A. Kalaydzhyan, O.D. Mücke, W. Wang, M. Xin CFEL, Hamburg, Germany F.X. Kärtner, M.Y. Peng, M. Xin MIT, Cambridge, Massachusetts, USA
	Funding: This work was supported by the Center for Free-Electron Laser Science at Deutsches Elektronen-Synchrotron, a research center of the Helmholtz Association in Germany. Next-generation photon-science facilities such as X-ray free-electron lasers (X-FELs)* and intense-laser beamline centers are emerging world-wide with the goal of generating sub-fs X-ray pulses with unprecedented brightness to capture ultrafast chemical and physical phenomena with sub-atomic spatiotemporal resolution. The only obstacle preventing this long-standing scientific dream to come true is a high- precision timing distribution system* synchronizing various microwave and optical sub-sources across multi-km distances which is required for seeded X-FELs and attosecond pump-probe experiments. Here, we present, for the first time, a synchronous laser-microwave network that will enable attosecond precision photon science facilities. By developing new ultrafast metrological timing devices and carefully balancing fiber nonlinearities and fundamental noise contributions, we have achieved timing stabilization of a 4.7 km fiber network with 580 attosecond precision over 52 hours. Furthermore, we have realized a complete laser-microwave network incorporating two mode-locked lasers and one microwave source with total 950 attosecond jitter integrated from 1 microsecond to 18 hours. J. Stohr, LCLS-II Conceptual Design Report. No. SLAC-R-978. (SLAC, 2011). G. Mourou, T. Tajima, Optics & Photonics News 22, 47 (2011). **J. Kim, et al., Nat. Photonics 2(12), 733-736 (2008).
	Slides TUBL03 [11.692 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUBL03
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TUPG03	Accurate Bunch Resolved BPM System	storage-ring, operation, FPGA, diagnostics	311
	F. Falkenstern, F. Hoffmann, J. Kuszynski, M. Ries HZB, Berlin, Germany
	Operation with multiple beams stored on different orbits in storage rings as well as beam dynamics studies requires accurate and stable Beam Position Monitor (BPM) measurements for each individual bunch. Analog BPM systems are usually optimized for measuring the closed orbit, i.e. averaging over all buckets and many turns. Therefore no information about the position of individual bunches are supplied. The new bunch resolved BPM electronic, currently under development at HZB, is based on the analysis of RF-signals delivered by a set of four stripline / pick-up electrodes in each beam position monitor. It has a high spatial resolution over a wide range of bunch currents. Using the four well matched (phase and amplitude) bunch induced RF-signals in combination with a low jitter master clock and commercial data acquisition cards allow beam position measurements on a bunch to bunch basis with micrometer resolution. Experimental results obtained at BESSY II and MLS demonstrates the achieved performance of the setup and will be discussed in detail.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG03
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TUPG10	LCLS-1 Cavity BPM Algorithm for Unlocked Digitizer Clock	cavity, timing, operation, dipole	336
	T. Straumann, S.R. Smith SLAC, Menlo Park, California, USA
	Funding: Work supported by U.S. Department of Energy Contract No. DE-AC02-76SF00515 Cavity BPMs commonly use the fundamental TM010 mode (excited either in the x/y cavity itself or in a separate "reference" cavity) which is insensitive to beam position as a reference signal, not only for amplitude normalization but also as a phase/time reference to facilitate synchronous detection of the signal derived from the position-sensitive TM110 mode. When taking these signals into the digital domain the reference and position signals need to be acquired by a synchronous clock. However, unless this clock is also locked to the accelerating RF, absolute timing information is lost which affects the relative phase between reference and position signals (assuming they are not carefully tuned to the same frequency). This contribution presents a method for estimating the necessary time of arrival information based on the sampled reference signal which is used to make the signal detection insensitive to the phase of the digitizer clock. Running an unlocked digitizer clock allows for considerable simplification of infrastructure (cabling, PLLs) and thus decreases cost and eases maintenance.
	Poster TUPG10 [1.100 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG10
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TUPG20	The CMS Beam Halo Monitor at the LHC: Implementation and First Measurements	background, experiment, vacuum, luminosity	364
	N. Tosi INFN-Bologna, Bologna, Italy
	A Cherenkov based detector system has been installed at the Large Hadron Collider (LHC), in order to measure the Machine Induced Background (MIB) for the Compact Muon Solenoid (CMS) experiment. The system is composed of forty identical detector units formed by a cylindrical Quartz radiator directly coupled to a Photomultiplier. These units are installed at a radius of 1.8m and a distance of 20.6 m from the CMS interaction point. The fast and direction-sensitive signal allows to measure incoming MIB particles while suppressing the much more abundant collision products and albedo particles, which reach the detector at a different time and from a different direction. The system readout electronics is based on the QIE10 ASIC and a uTCA based back-end, and it allows a continuous online measurement of the background rate separately per each bunch. The detector has been installed in 2015 and is now fully commissioned. Measurements demonstrating the capability of detecting anomalous beam conditions will be presented. on behalf of the CMS collaboration
	Poster TUPG20 [2.609 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG20
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TUPG22	Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector	timing, simulation, radiation, photon	372
	J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei NUAA, Nanjing, People's Republic of China
	The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range. L. Karsch, A. Bohm et al,"Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.
	Poster TUPG22 [5.665 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG22
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TUPG23	Use CR-39 Plastic Dosimeters for Beam Ion Halo Measurements	proton, linac, diagnostics, software	376
	I. Eliyahu, A. Cohen, E. Daniely, B. Kaizer, A. Kreisler, A. Perry, A. Shor, L. Weissman Soreq NRC, Yavne, Israel
	Beam halo and growth of beam emittance are important issues for high-intensity linear accelerators. Beam-dynamic predictions of weak beam tails are usually not reliable due to complexity of the non-linear effects leading to halo formation. Therefore, development of a simple method for beam halo diagnostics is highly desirable. The first testing of CR-39 solid-state nuclear track dosimeters for beam halo measurement were performed at the SARAF phase I accelerator with a few MeV proton beams. Beam pulses of 90 nA peak intensity of shortest possible duration (15 ns) were used for direct irradiation of standard CR-39 personal dosimetry tags. Other irradiations were done with beam pulses of 200 ns duration and of 1 mA peak intensity. Specially prepared large area CR-39 plates with central hole for the beam core transport were used in these tests. Weak beam structures were clearly observed in the both types of irradiation. The tests showed feasibility of beam halo measurements down to resolution level of a single proton. The optimum CR-39 etching conditions were established. The advantages and drawback of the method are discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG23
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TUPG27	Beam Diagnostics for Medical Accelerators	proton, diagnostics, ion, network	387
	C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement No 675265. The Optimization of Medical Accelerators (OMA) is the aim of a new European Training Network that has received 4 ME of funding within the Horizon 2020 Programme of the European Union. OMA joins universities, research centers and clinical facilities with industry partners to address the challenges in treatment facility design and optimization, numerical simulations for the development of advanced treatment schemes, and beam imaging and treatment monitoring. This contribution presents an overview of the network's research into beam diagnostics and imaging. This includes investigations into applying detector technologies originally developed for high energy physics experiments (such as VELO, Medipix) for medical applications; integration of prompt gamma cameras in the clinical workflow; identification of optimum detector configurations and materials for high resolution spectrometers for proton therapy and radiography; ultra-low charge beam current monitors and diagnostics for cell studies using proton beams. It also summarizes the network-wide training program consisting of Schools, Topical Workshops and Conferences that will be open to the wider medical and accelerator communities.
	Poster TUPG27 [0.388 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG27
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TUPG40	The Cherenkov Detector for Proton Flux Measurement (CpFM) in the UA9 Experiment	experiment, proton, radiation, vacuum	430
	S. Montesano, W. Scandale CERN, Geneva, Switzerland F.M. Addesa, G. Cavoto, F. Iacoangeli INFN-Roma, Roma, Italy L. Burmistrov, S. Dubos, V. Puill, W. Scandale, A. Stocchi LAL, Orsay, France
	The UA9 experiment at the CERN SPS investigates the possibility to use bent crystals to steer particles in high energy accelerators. In this framework the CpFM have been developed to measure the beam particle flux in different experimental situations. Thin movable fused-silica bars installed in the SPS primary vacuum and intercepting the incoming particles are used to radiate Cherenkov light. The light signal is collected outside the beam pipe through a quartz optical window by radiation hard PMTs. The PMT signal is readout by the WaveCatcher acquisition board, which provides count rate as well as waveform information over a configurable time window. A bundle of optical fibers can be used to transport the light signal far from the beam pipe, allowing to reduce the radiation dose to the PMT. A first version of the CpFM has been successfully commissioned during the data taking runs of the UA9 Experiment in 2015, while a second version has been installed in the TT20 extraction line of the SPS in 2016. In this contribution the design choices will be presented and the final version of the detector will be described in detail.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG40
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TUPG42	Design of a Very Compact 130 MeV Møller Polarimeter for the S-DALINAC	electron, target, polarization, scattering	438
	T. Bahlo, J. Enders, T. Kürzeder, N. Pietralla, J. Wissmann TU Darmstadt, Darmstadt, Germany
	Funding: Supported by the DFG through grants SFB 634 and GRK 2128 At the Superconducting Darmstadt Linear Accelerator S-DALINAC it is possible to accelerate electron beams to a maximum energy of up to 130 MeV. In the S-DALINAC Polarized Injector SPIN polarized electrons with a polarization of up to 86% can be produced. The polarization can be measured with two already mounted Mott polarimeters in the injector beamline where the electrons can have energies of up to 10 MeV. To allow polarization measurements behind the main accelerator a Moeller polarimeter suitable for energies between 50 MeV and 130 MeV is currently being developed. The rather low and variable beam energies result in a big and also variable scattering angle distribution. Combined with strict spatial boundary conditions at the designated mounting area necessitate a very compact set-up for the polarimeter. In addition to an overview over the planned polarimeter we will present drafts of the target chamber, the beam separation chamber including a angle-defining aperture and the separation dipole as well as the beamline to the detectors and the beam dump.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG42
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TUPG53	Bunch Arrival-Time Monitoring for Laser Particle Accelerators and Thomson Scattering X-Ray Sources	laser, electron, timing, pick-up	468
	J.M. Kraemer, M. Kuntzsch, U. Lehnert, P. Michel, U. Schramm HZDR, Dresden, Germany J.P. Couperus, A. Irman, A. Koehler, O. Zarini Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
	The ELBE center of high power radiation sources at Helmholtz-Zentrum Dresden-Rossendorf combines a superconducting CW linear accelerator with Terawatt- and Petawatt-level laser sources. Key experiments rely on precise timing and synchronization between the different radiation pulses. An online single shot monitoring system has been set up in order to measure the timing between the high-power Ti:Sa laser DRACO and electron bunches generated by the conventional SRF accelerator. This turnkey timing system is suitable for timing control of Thomson scattering X-ray sources and external injection of electron bunches into a laser wakefield accelerator. It uses a broadband RF pickup to acquire a probe of the particle bunch's electric field and modulates a fraction of the high power laser pulse in a fast electro-optical modulator. The amplitude modulation gives a direct measure for the timing between both beams. Using this setup a resolution of <200 fs RMS has been demonstrated. The contribution will show the prototype, first measurement results and will discuss future modification in order to improve the resolution of the system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG53
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TUPG54	Novel Approach to the Elimination of Background Radiation in a Single-Shot Longitudinal Beam Profile Monitor	radiation, polarization, background, electron	471
	H. Harrison, G. Doucas, I.V. Konoplev, A.J. Lancaster, H. Zhang JAI, Oxford, United Kingdom A. Aryshev, M. Shevelev, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan
	It is proposed to use the polarization of coherent Smith-Purcell radiation (cSPr) to distinguish between the cSPr signal and background radiation in a single-shot longitudinal bunch profile monitor. A preliminary measurement of the polarization has been carried out using a 1mm periodic metallic grating installed at the 8MeV electron accelerator LUCX, KEK (Japan). The measured degree of polarization at '=90° (300GHz) is 72.6 ±%. To make a thorough test of the theoretical model, measurements of the degree of polarization must be taken at more emission angles - equivalent to more frequencies. This work was supported (in parts) by the: STFC UK, the Leverhulme Trust, JAI University of Oxford and the Photon and Quantum Basic Research Coordinated Development (Japan).
	Poster TUPG54 [0.432 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG54
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TUPG57	5 MeV Beam Diagnostics at the Mainz Energy-Recovering Superconducting Accelerator MESA	diagnostics, cavity, dipole, beam-diagnostic	479
	S. Heidrich, K. Aulenbacher IKP, Mainz, Germany
	Within the next few years a new energy recovering superconducting electron accelerator will be built at the institute for nuclear physics in Mainz. To adjust the properties of the beam correctly to the first acceleration in the superconducting cavities, a high resolution longitudinal beam diagnosis is required at the 5 MeV injection arc. The system employs two 90-degree vertical deflection dipoles to achieve an energy resolution of 500 eV and a phase resolution of 60 micrometers. As a second challenge the transverse emittance measurements will take place at full beam current. This demands an extremely heat resistant diagnosis system, realized by a method similar to flying wire.
	Poster TUPG57 [6.090 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG57
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TUPG59	Bunch Extension Monitor for LINAC of SPIRAL2 Project	linac, ion, positron, diagnostics	486
	R.V. Revenko, J.L. Vignet GANIL, Caen, France
	A semi-interceptive monitor for bunch shape measure-ment has been developed for the LINAC of SPIRAL2. A Bunch Extension Monitor (BEM) is based on the registra-tion of X-rays emitted by the interaction of the beam ions with a thin tungsten wire. The time difference between detected X-rays and accelerating RF gives information about distribution of beam particles along the time axis. These monitors will be installed inside diagnostic boxes on the first five warm sections of the LINAC. The monitor consists of two parts: X-ray detector and mechanical system for positioning the tungsten wire into the beam. Emitted X-rays are registered by microchannel plates with fast readout. Signal processing is performed with constant fraction discriminators and TAC coupled with MCA. Results of bunch shape measurements obtained during commissioning of RFQ for SPIRAL2 are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG59
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TUPG64	Bunch Length Measurement Based on Interferometric Technique by Observing Coherent Transition Radiation	electron, radiation, linac, gun	498
	I. Nozawa, M. Gohdo, K. Kan, T. Kondoh, J. Yang, Y. Yoshida ISIR, Osaka, Japan
	Generation and diagnosis of ultrashort electron bunches are one of the main topics of accelerator physics and applications in related scientific fields. In this study, ultrashort electron bunches with bunch lengths of femtoseconds and bunch charges of picocoulombs were generated from a laser photocathode RF gun linac and an achromatic arc-type bunch compressor. Observing coherent transition radiation (CTR) emitted from the electron bunches using a Michelson interferometer, the interferograms of CTR were measured experimentally. The bunch lengths were diagnosed by performing a model-based analysis of the interferograms of CTR.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG64
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TUPG66	High-Energy X-Ray Pinhole Camera for High-Resolution Electron Beam Size Measurements	photon, operation, emittance, electron	504
	B.X. Yang, S.H. Lee, J.W. Morgan, H. Shang ANL, Argonne, Illinois, USA
	Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source (APS) is developing the design of a multi-bend achromat (MBA) lattice based storage ring as the next major upgrade, featuring a 20-fold reduction in emittance. Combining the reduction of beta functions, the electron beam sizes at bend magnet sources may be reduced to reach 5 - 10 μm for 10% vertical coupling. The x-ray pinhole camera currently used for beam size monitoring will not be adequate for the new task. By increasing the operating photon energy to 120 keV or higher, the pinhole camera's resolution is expected to reach below 4 μm. The peak height of the pinhole image will be used to monitor relative changes of the beam sizes and enable the feedback control of the emittance. We present the computer simulation and the design of a prototype beam size monitor for the APS storage ring.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG66
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TUPG68	Study of the Radiation Damage on a Scintillating Fibers Based Beam Profile Monitor	radiation, factory, proton, extraction	512
	E. Rojatti, G.M.A. Calvi, L. Lanzavecchia, A. Parravicini, C. Viviani CNAO Foundation, Milan, Italy
	The Scintillating Fibers Harp (SFH) monitors are the beam profile detectors used in the High Energy Beam Transfer (HEBT) lines of the CNAO (Centro Nazionale Adroterapia Oncologica, Italy) machine. The use of scintillating fibers coupled with a high-resolution CCD camera makes the detector of simple architecture and with high performances (less than 0.5mm resolution and 50Hz frame rate); on the other hand, fibers radiation damage shall be faced after some years of operation. The damage appears in multiple ways, as efficiency loss in light production, delayed light emission, attenuation length reduction. The work presents measurements and analysis performed to understand the phenomenon, in such a way to deal with it as best as possible. The connection between dose rate, integral dose and damage level is investigated as well as the possible recovery after a period of no irradiation. The influence of the damage effects on profiles reconstruction and beam parameters calculation is studied. Data elaboration is modified in such a way to compensate radiation damage effects and protract the SFH lifetime, before the major intervention of fibers replacement. Methods and results are discussed.
	Poster TUPG68 [1.244 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG68
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TUPG71	Ionization Profile Monitor Simulations - Status and Future Plans	simulation, electron, ion, space-charge	520
	M. Sapinski, P. Forck, T. Giacomini, R. Singh, S. Udrea, D.M. Vilsmeier GSI, Darmstadt, Germany F. Belloni, J. Marroncle CEA/IRFU, Gif-sur-Yvette, France B. Dehning, J.W. Storey CERN, Geneva, Switzerland K. Satou J-PARC, KEK & JAEA, Ibaraki-ken, Japan C.A. Thomas ESS, Lund, Sweden R.M. Thurman-Keup Fermilab, Batavia, Illinois, USA C.C. Wilcox, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Nonuniformities of the extraction fields, the velocity distribution of electrons from ionization processes and strong bunch fields are just a few of the effects affecting Ionization Profile Monitor measurements and operation. Careful analysis of these phenomena require specialized simulation programs. A handful of such codes has been written independently by various researchers over the recent years, showing an important demand for this type of study. In this paper we describe the available codes and discuss various approaches to Ionization Profile Monitor simulations. We propose benchmark conditions to compare these codes between themselves and we collect data from various devices to benchmark codes against the measurements. Finally we present a community effort with a goal to discuss the codes, exchange simulation results and to develop and maintain a new, common codebase.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG71
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TUPG72	Calibration of X-ray Monitor during the Phase I of SuperKEKB commissioning	emittance, factory, scattering, optics	524
	E. Mulyani Sokendai, Ibaraki, Japan J.W. Flanagan KEK, Ibaraki, Japan
	X-ray monitors (XRM) have been installed in each SuperKEKB ring, the Low Energy Ring (LER) and High Energy Ring (HER), primarily for vertical beam size measurement. Both rings have been commissioned in Phase I of SuperKEKB operation (February-June 2016), and several XRM calibration studies have been carried out. The geometrical scale factors seems to be well understood for both LER and HER. The emittance knob ratio method yielded results consistent with expectations based on the machine model optics (vertical emittance ε_y is {§I{≈8}{pm}}). For the HER, the vertical emittance ε_y is {§I{≈41}{pm}}, which is 4× greater than the optics model expectation. Analysis of beam size and lifetime measurements suggests unexpectedly large point response functions, particularly in the HER.
	Poster TUPG72 [34.615 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG72
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TUPG76	Performance Studies of Industrial CCD Cameras Based on Signal-To-Noise and Photon Transfer Measurements	photon, electron, diagnostics, background	540
	G. Kube DESY, Hamburg, Germany
	Taking advantage of the rapid development and the huge market for commercial available optical sensors, in the past years optical measuring techniques took on greater significance. Nowadays, area scan CCD or CMOS sensors are widely used for beam profile diagnostics. They provide the full two-dimensional information about the particle beam distribution, allowing in principle to investigate shot-to-shot profile fluctuations at moderate repetition rates. In order to study the performance and to characterize these cameras, photon transfer is a widely applied popular and valuable testing methodology. In this contribution, studies based on signal-to-noise and photon transfer measurements are presented for CCD cameras which are in use for beam profile diagnostics at different DESY accelerators.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG76
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TUPG77	Experimental Results of a Compact Laserwire System for Non-Invasive H⁻ Beam Profile Measurements at CERN's Linac4	laser, linac, electron, optics	544
	S.M. Gibson, G.E. Boorman, A. Bosco Royal Holloway, University of London, Surrey, United Kingdom T. Hofmann, U. Raich, F. Roncarolo CERN, Geneva, Switzerland
	Funding: Support from UK STFC, grant ST/N001753/1. A non-invasive laserwire system is being developed for quasi-continuous monitoring of the transverse profile and emittance of the final 160 MeV beam at CERN's LINAC4. As part of these developments, a compact laser-based profile monitor was recently tested during LINAC4 commissioning at beam energies of 50 MeV, 80 MeV and 10⁷ MeV. A laser with a tunable pulse width (1-300 ns) and ~200 W peak power in a surface hutch delivers light via a 75 m LMA transport fibre to the accelerator. Automated scanning optics deliver a free space <150 micron width laserwire to the interaction chamber, where a transverse slice of the hydrogen ion beam is neutralised via photo-detachment. The liberated electrons are deflected by a low field dipole and captured by a sCVD diamond detector, that can be scanned in synchronisation with the laserwire position. The laserwire profile of the LINAC4 beam has been measured at all commissioning energies and is found in very good agreement with interpolated profiles from conventional SEM-grid and wire scanner measurements, positioned up and downstream of the laserwire setup. Improvements based on these prototype tests for the design of the final system are presented.
	Poster TUPG77 [3.695 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG77
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TUPG82	Preliminary Measurement on Potential Luminescent Coating Material for the ESS Target Imaging Systems	target, proton, controls, coupling	559
	C.A. Thomas, M.A. Hartl, Y. Lee, T.J. Shea ESS, Lund, Sweden E. Adli, H. Gjersdal, M.R. Jaekel, O. Rohne University of Oslo, Oslo, Norway S. Joshi University College West, Trollhätan, Sweden
	We present in this paper the preliminary measurements performed on luminescent materials to be investigated and eventually coated on the ESS target wheel, the Proton Beam Window separating the end of the ESS Linac and the entrance of the ESS target area, and the ESS Dump. Among all the properties of the luminescent material required for the target imaging systems, luminescence yield and luminescent lifetime are essential for two reasons. The first one is trivial, since this material is the source for the imaging system and sets its potential performance. The lifetime is not generally of importance, unless the object is moving, or time dependence measurements are to be done. In our case, the target wheel is moving, and measurement of the beam density current may have to be performed at the 10μups scale. Thus luminescence lifetime of the coating material should be known and measured. In this paper, we present the luminescence measurements of the photo-luminescent lifetime of several materials currently under studies to be used eventually for the first beam on target.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG82
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WEPG07	A Heterogeneous FPGA/GPU Architecture for Real-Time Data Analysis and Fast Feedback Systems	GPU, FPGA, monitoring, data-analysis	626
	M. Vogelgesang, L.E. Ardila Perez, M. Caselle, S.A. Chilingaryan, A. Kopmann, L. Rota, M. Weber KIT, Eggenstein-Leopoldshafen, Germany
	We propose a versatile and modular approach for a real-time data acquisition and evaluation system used for monitoring and feedback control in beam diagnostic and photon science experiments. Our hybrid architecture is based on an FPGA readout card* and a GPU for data processing. To increase throughput, lower latencies and reduce overall system strain, the FPGA write data directly in the GPU. After real-time data analysis the GPU writes back results either directly to the FPGA in case of fast feedback systems or to the CPU host system for storage. Communication and scheduling are handled transparently by our processing framework*. However, users can customize and extend it with their own processing plugins. Although the system is designed for real-time purposes, the modular approach also allows standalone usage for high-speed off-line analysis. We evaluated the performance of our solution measuring both processing times of data analysis algorithms used with beam instrumentation detectors as well as transfer times between FPGA and GPU. The latter suggests throughputs of up to 6.5 GB/s with latencies down to tens of microseconds, thus making it suitable for fast feedback systems. A PCIe DMA Architecture for Multi-Gigabyte Per Second Data Transmission, 10.1109/TNS.2015.2426877 ** A Scalable GPU-based Image Processing Framework for On-line Monitoring, 10.1109/HPCC.2012.116
	Poster WEPG07 [17.144 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG07
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WEPG23	Evaluating Beam-Loss Detectors for LCLS-2	ion, electron, linac, radiation	678
	A.S. Fisher, R.C. Field, L.Y. Nicolas SLAC, Menlo Park, California, USA
	The LCLS x-ray FEL occupies the third km of the 3-km SLAC linac, which accelerates electrons in copper cavities pulsed at 120 Hz. For LCLS-2, the first km of linac will be replaced with superconducting cavities driven by continuous RF at 1300 MHz. The normal-conducting photocathode gun will also use continuous RF, at 186 MHz. The laser pulse rate will be variable up to 1 MHz. With a maximum beam power of 250 kW initially, and eventually 1 MW, the control of beam loss is critical for machine and personnel safety, especially since losses can continue indefinitely in linacs and dark current emitted in the gun or cavities can be lost at any time. SLAC protection systems now depend on ionization chambers, both local devices at expected loss sites and long gas-dielectric coaxial cables for distributed coverage. However, their ion collection time is over 1 ms, far slower than the beam repetition rate. We present simulations showing that with persistent losses, the space charge of accumulated ions can null the electric field inside the detector, blinding it to an increase in loss. We also report on tests comparing these detectors to faster alternatives.
	Poster WEPG23 [6.589 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG23
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WEPG33	The Measurement and Controlling System of Beam Current for Weak Current Accelerator	electron, target, controls, gun	697
	J.H. Yue, Y. Li, Z.J. Ma, Y. Xie, L. Yu IHEP, Beijing, People's Republic of China
	For some detectors' calibration, a very weak electron current provided by accelerator is necessary. In order to control the beam current to the detector, 8 movable slits in which the position resolution of the stoppers is better than 5μm are installed along the accelerator. For the weak current measurement, 9 movable current monitors based on scintillator are installed along the beam line. These monitors can measure the very weak current, even to several electrons. The monitors can be pulled away the beam axis when the electron beam goes to the downstream.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG33
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WEPG34	Heavy Ion Beam Flux and In-situ Energy Measurements at High LET	ion, heavy-ion, cyclotron, radiation	700
	S. Mitrofanov, I.V. Kalagin, V.A. Skuratov, Yu.G. Teterev JINR, Dubna, Moscow Region, Russia V.S. Anashin United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia
	The Russian Space Agency with the TL ISDE involvement has been utilizing ion beams from oxygen up to bismuth delivered from cyclotrons of the FLNR JINR accelerator complex for the SEE testing during last seven years. The detailed overview of the diagnostic set-up features used for low intensity ion beam parameters evaluation and control during the corresponding experiments is presented. Special attention is paid to measurements of ion flux and energy at high LET levels and evaluation of ion beam uniformity over large (200x200 mm) irradiating areas. The online non-invasive (in-situ) time of flight technique designed for low intensity ion beam energy measurements based on scintillation detectors is considered in details. The system has been successfully commissioned and is used routinely in the SEE testing experiments.
	Poster WEPG34 [7.361 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG34
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WEPG35	Design of an Electron Cloud Detector in a Quadrupole Magnet at CesrTA	electron, quadrupole, simulation, vacuum	704
	J.P. Sikora, S.T. Barrett, M.G. Billing, J.A. Crittenden, K.A. Jones, Y. Li, T.I. O'Connell Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: This work is supported by the US National Science Foundation PHY-0734867, PHY-1002467 and the US Department of Energy DE-FC02-08ER41538, DE-SC0006505. We have designed a detector that measures the electron cloud density in a quadrupole magnet using two independent techniques. Stripline electrodes collect electrons that would otherwise impact the beam-pipe surface. The striplines are placed behind an array of small holes in the beam-pipe wall in order to shield them from the beam-induced electromagnetic pulse. There are three striplines placed near one of the pole tips so that they cover a roughly 0.43 radian azimuth. The beam-pipe chamber has also been designed so that microwave measurements of the electron cloud density can be performed. Beam position monitor buttons have been included for excitation and reception of microwaves and the chamber has been designed so that the resonant microwaves are confined to be within the 56 cm length of the quadrupole field. This paper provides some details of the design including CST Microwave Studio time domain simulation of the stripline detectors and eigenmode simulation of the resonant chamber. The detector is installed in the Cornell Electron Storage Ring and is part of the test accelerator program for the study of electron cloud using electron and positron beams from 2 to 5 GeV.
	Poster WEPG35 [2.166 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG35
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WEPG46	KALYPSO: A Mfps Linear Array Detector for Visible to NIR Radiation	laser, diagnostics, electron, real-time	740
	L. Rota, B.M. Balzer, M. Caselle, A.-S. Müller, M.J. Nasse, G. Niehues, P. Schönfeldt, M. Weber KIT, Eggenstein-Leopoldshafen, Germany C. Gerth, B. Steffen DESY, Hamburg, Germany N. Hiller, A. Mozzanica PSI, Villigen PSI, Switzerland D.R. Makowski, A. Mielczarek TUL-DMCS, Łódź, Poland
	Funding: This work is partially funded by the BMBF contract number: 05K16VKA. The acquisition rate of commercially available line array detectors is a bottleneck for beam diagnostics at high-repetition rate machines like synchrotron lightsources or FELs with a quasi-continuous or macro-pulse operation. In order to remove this bottleneck we have developed KALYPSO, an ultra-fast linear array detector operating at a frame-rate of up to 2.7 Mfps. The KALYPSO detector mounts InGaAs or Si linear array sensors to measure radiation in the near-infrared or visible spectrum. The FPGA-based read-out card can be connected to an external data acquisition system through a high-performance PCI-Express 3.0 data-link, allowing continuous data taking and real-time data analysis. The detector is fully synchronized with the timing system of the accelerator and other diagnostic instruments. The detector is currently installed at several accelerators: ANKA, the European XFEL and TELBE. We present the detector and the results obtained with Electro-Optical Spectral Decoding (EOSD) setups.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG46
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WEPG50	Non-Invasive Bunch Length Diagnostics of Sub-Picosecond Beams	pick-up, simulation, vacuum, real-time	756
	S.V. Kuzikov, A.A. Vikharev IAP/RAS, Nizhny Novgorod, Russia S.P. Antipov, S.V. Kuzikov Euclid TechLabs, LLC, Solon, Ohio, USA S.V. Kuzikov UNN, Nizhny Novgorod, Russia
	Funding: This work was partially supported by the Russian Scientific Foundation (grant #16-19-10448). We propose a non-invasive bunch length measurement system based on RF pickup interferometry. A device performs interferometry between two broadband wake signals generated by a single short particle bunch. The mentioned wakes are excited by two consequent small gaps in beam channel. A field pattern formed by interference of the mentioned two coherent wake signals is registered by means of detector arrays placed at outer side of beam channel. The detectors are assumed to be low-cost integrating detectors (pyro-detectors or bolometers) so that integration time is assumed to be much bigger than bunch length. Because RF signals come from gaps to any detector with different time delays which depend on particular detector coordinate, the array allows to substitute measurements in time by measurements in space. Simulations with a 1 ps beam and a set of two 200 micron wide vacuum breaks separated by 0.5 mm were done using CST Particle Studio. These simulations show good accuracy. Moreover, one can recover the detailed temporal structure of the measured pulse using a new developed synthesis procedure.
	Poster WEPG50 [2.780 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG50
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WEPG55	Synchronization of ps Electron Bunches and fs Laser Pulses Using a Plasmonics-Enhanced Large-Area Photoconductive Detector	electron, laser, quadrupole, vacuum	774
	E.J. Curry, M. Jarrahi, P. Musumeci, N.T. Yardimci UCLA, Los Angeles, California, USA B.T. Jacobson RadiaBeam, Santa Monica, California, USA
	Temporal synchronization between short relativistic electron bunches and laser pulses at the ps and sub-ps level is required for accelerator applications like inverse Compton light sources. Photoconductive antennas with THz and sub-THz bandwidth which are gated by fs lasers provide this level of timing resolution. This paper describes the operating principals of the diagnostic along with bench-top experimental results with recently developed plasmonics-enhanced large-area devices. A vacuum chamber with robust electronic noise reduction has been designed for upcoming beam-based experiments.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG55
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WEPG56	Single-Shot THz Spectroscopy for the Characterization of Single-Bunch Bursting CSR	impedance, radiation, electron, operation	778
	J. Raasch, M. Arndt, J. Hänisch, K.S. Ilin, K. Kuzmin, A.-S. Müller, A. Schmid, M. Siegel, J.L. Steinmann, S. Wuensch KIT, Karlsruhe, Germany G. Cinque, M. Frogley DLS, Oxfordshire, United Kingdom B. Holzapfel Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
	Funding: The work was supported by the BMBF (05K13VK4), the Helmholtz International Research School for Teratronics & the Karlsruhe School of Elementary Particle and Astroparticle Physics. An integrated array of narrow-band high-Tc YBa2Cu3O7-x (YBCO) detectors embedded in broad-band readout was developed for the future use at synchrotron light sources as a single-shot terahertz (THz) spectrometer. The detection system consists of up to four thin-film YBCO nanobridges fed by planar double-slit antennas covering the frequency range from 140 GHz up to 1 THz. We present first results obtained at the ANKA storage ring and at Diamond Light Source during operation of two and four frequency-selective YBCO detectors, respectively.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG56
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WEPG57	Single-Shot THz Spectrometer for Bunch Length Measurements	radiation, electron, diagnostics, alignment	782
	S.V. Kutsaev, A.Y. Murokh, M. Ruelas, H.L. To RadiaBeam Systems, Santa Monica, California, USA V. Goncharik Logicware Inc, New York, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under contract DE-SC0013684 We present a new diagnostics instrument designed to measure bunch length in RF particle accelerators. Typically, scanning-type Michelson or Martin-Puplett interferometers are used to measure the coherent radiation from a short bunch. However, they require averaging over several shots over several minutes, thus being able to report only the average bunch length. We propose to measure the emitted coherent spectrum of a short bunch emission that contains the same spectral information as the bunch shape by means of single-shot spectrometry. In this paper we present design considerations, and first experimental results obtained at FACET for the instrument that allows shot-to-shot measurement of the emitted spectrum.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG57
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WEPG61	Theory of X-Ray Transition Radiation from Graphene for Transition Radiation Detectors	radiation, electron, plasma, target	788
	A.A. Tishchenko, A. Romaniouk, D.Yu. Sergeeva, M.N. Strikhanov MEPhI, Moscow, Russia
	We present the theory of transition radiation for monolayers in X-ray domain from the first principles and consider the pros and cons of using graphene-monolayer in transition radiation detectors.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG61
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WEPG67	Non-Invasive Beam Profile Measurement for High Intensity Electron Beams	electron, laser, photon, background	803
	T. Weilbach, K. Aulenbacher, M.W. Bruker HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany
	Beam profile measurements of high intensity electron beams below 10 MeV, e.g. in energy recovery linacs or magnetized high energy electron coolers, have to fulfill special demands. Commonly used diagnostic tools like synchrotron radiation and scintillation screens are ineffective or not able to withstand the beam power without being damaged. Non-invasive methods with comparable resolution are needed. Hence, a beam profile measurement system based on beam-induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components, especially in the injector and merger parts of an ERL. Since this measurement suffers from low count rates, special attention has to be given to the background. Beam profile measurements with the BIF system will be presented as well as a comparison with YAG screen measurements. The recent status of the TLS system will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG67
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WEPG68	An Investigation into the Behaviour of Residual Gas Ionisation Profile Monitors in the ISIS Extracted Beamline	ion, simulation, synchrotron, proton	807
	C.C. Wilcox, B. Jones, A. Pertica, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Non-destructive beam profile measurements at the ISIS neutron source are performed using Multi-Channel Profile Monitors (MCPMs). These use residual gas ionisation within the beam pipe, with the ions being guided to an array of 40 Channeltron electron multipliers by a high voltage drift field. Non-uniform transverse electric fields within these monitors are caused by the drift field and the beam's space charge. Longitudinally, a saddle point located between the drift field plate and the opposing compensating field plate introduces extra complexity into the ion motion. To allow for detailed studies of this behaviour, an MCPM has been placed in Extracted Proton Beamline 1 (EPB1) where the beam is well defined. Simulations of the profiles obtained by this monitor are performed using machine measurements, CST EM Studio and a simple C++ particle tracking code. This paper describes the process used to simulate MCPM profiles along with a comparison of simulated and measured results. Trajectories of detected ions from their creation to the Channeltrons are discussed, together with a study of Channeltron detection characteristics carried out in the ISIS diagnostics laboratory vacuum tank.
	Poster WEPG68 [2.703 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG68
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WEPG69	Profile Measurement by the Ionization Profile Monitor with 0.2T Magnet System in J-PARC MR	electron, ion, injection, simulation	811
	K. Satou, H. Kuboki, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	A nondestructive Ionization Profile Monitor (IPM) is widely used to measure transversal profile. At J-PARC Main Ring (MR), three IPM systems have been used not only to measure emittances but also to correct injection miss matchings. To measure injection 3GeV beam profiles, the high external E field of +50kV/130mm at the maximum is used to guide ionized positive ions to a position sensitive detector; transversal kick force originating from space charge E field of circulating beam is a main error source which deteriorates profile. The strong B field is also used to compensate the kick force. To measure 30GeV bunched beam at the flat top on the fast extraction mode in good resolution, the strong B field of about 0.2T is needed. One set of magnet system, which consists of a C-type and two H-type magnets, were developed and installed in one IPM system. The IPM chamber was inserted between the 2 poles of the C-type magnet. To make the line integral of B field along the beam axis zero, the H-type magnets have the opposite field polarity to that of the C-type magnet and were installed on both sides of the C-type magnet. Details of the magnet system and its first trials will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG69
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WEPG73	A Hardware and Software Overview on the New BTF Transverse Profile Monitor	software, timing, linac, positron	818
	B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta INFN/LNF, Frascati (Roma), Italy P. Valente INFN-Roma, Roma, Italy
	Funding: Supported by the H2020 project AIDA-2020, GA no. 654168 In the last 11 years, the Beam-Test Facility (BTF) of the DAΦNE accelerator complex, in the Frascati laboratory, has gained an important role in the EU infrastructures devoted to the development of particle detectors. The facility can provide runtime tuneable electrons and positrons beams in a range of different parameters: energy (up to 750 MeV for e^- and 540 MeV for e+), charge ( up to 10¹⁰ e /bunch) and pulse length (1.4-40 ns). The bunch delivering rate is up to 49 Hz and the beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad, in order to achieve user needs. In these paper we are going to describe the new implementation of the secondary BTF beam transverse monitor systems based on WIDEPIX FITPIX detectors, operating in bus synchronization mode externally timed to BTF beams. Our software layout includes a data producer, a live-data display consumer and a MEMCACHED caching server. This configuration offers to BTF users a vary fast approach to the transverse data using TCP/IP calls to MEMCACHED with an easy and fast software integration on users DAQ. The data packing permits also to avoid the needs of mixed (user vs BTF) hardware synchronization.
	Poster WEPG73 [3.267 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG73
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WEPG75	The Beam Profile Monitoring System for the CERN IRRAD Proton Facility	proton, data-acquisition, operation, radiation	825
	F. Ravotti, B. Gkotse, M. Glaser, E. Matli, G. Pezzullo CERN, Geneva, Switzerland K.K. Gan, H. Kagan, S. Smith, J.D. Warner Ohio State University, Columbus, Ohio, USA
	Funding: Project funded by AIDA project and the EU H2020 Research and Innovation programme, GA n. 654168. In High Energy Physics (HEP) experiments, devices are required to withstand high radiation levels. As a result, detectors and electronics sitting in the inner detector layers must be irradiated to determine their radiation tolerance. To perform these irradiations, CERN built during LS1 a new irradiation facility in the East Area at the Proton Synchrotron (PS) accelerator. At this facility, named IRRAD, a high-intensity 24 GeV/c proton beam is used. During beam steering and irradiation, the intensity and the transverse profile of the proton beam are monitored online. The IRRAD Beam Profile Monitor (BPM) uses a set of four 39-channel pixel detectors constructed using thin foil copper pads positioned on a flex circuit. When protons pass through the copper pads, they induce a measurable current. To measure this current a new data acquisition system was designed as well as a new database and on-line display system. In this work, we present the design and the architecture of the IRRAD BPM system, some results on its performance with the proton beam, as well as its planned upgrades, including its utilization for monitoring irradiations with an intense 300MeV/c positive pion beam at PSI.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG75
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THBL01	SiPMs for Beam Instrumentation. Ideas From High Energy Physics	photon, radiation, electronics, instrumentation	860
	D. Gascon, D. Ciaglia, G. Fernàndez, R. Graciani, S. Gómez, J. Mauricio, N. Rakotnavalona, A. Sanuy, D. Sánchez UB, Barcelona, Spain
	Silicon Photomultipliers (SiPM) enable fast low-level light detection and even photon counting with a semiconductor device. Thanks to a now matured technology, SiPMs can be used in a variety of applications like: Medical imaging, fluorescence detection, range-finding and high-energy physics. We present different possible application of SiPMs for beam instrumentation. First, we discuss timing properties of SiPMs, and how to optimize them for high rate environments enabling photon counting. This requires to understand the dependence of SiPM pulse shape on its configuration (total area, cell size, capacitances, etc) and analyse dedicated front end electronics techniques. Finally, based on the experience of several projects aiming to develop trackers for high energy physics, we present some ideas to develop beam monitoring instrumentation based scintillating fibers coupled to SiPMs, where radiation hardness of scintillating fibers can be an important concern.
	Slides THBL01 [5.473 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-THBL01
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Paper

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Other Keywords

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MOAL03

Beam Commissioning of SuperKEKB Rings at Phase 1

feedback, operation, injection, damping

6

M. Tobiyama, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, K. Mori, E. Mulyani, M. Tejima
KEK, Ibaraki, Japan
G. Bonvicini
Wayne State University, Detroit, Michigan, USA
E. Mulyani
Sokendai, Ibaraki, Japan
G.S. Varner
University of Hawaii, Honolulu,, USA

The Phase 1 commissioning of SuperKEKB rings with-out superconducting final focus magnets or Belle-II de-tector began in Feb., 2016. A total of 10¹⁰ mA (LER) and 870 mA (HER) stored beam has been achieved close to the design emittance and x-y coupling. Most of the beam diagnostics, including new systems such as gated turn-by-turn monitors and X-ray beam size monitors, have been commissioned with beam and proved to be essential to the success of machine commissioning. The results of the beam commissioning, including the evaluation and diffi-culties of the beam diagnostics are shown.

Slides MOAL03 [9.607 MB]

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MOPG07

First Operational Experience with the LHC Diode ORbit and OScillation (DOROS) System

electronics, embedded, FPGA, coupling

43

M. Gąsior, G. Baud, J. Olexa, G. Valentino
CERN, Geneva, Switzerland

The LHC started high-energy operation in 2015 with new tertiary collimators, equipped with beam position monitors embedded in their jaws. The required resolution and stability of the beam orbit measurements linked to these BPMs were addressed by the development of a new Diode ORbit and OScillation (DOROS) system. DOROS converts the short BPM electrode pulses into slowly varying signals by compensated diode detectors, whose output signals can be precisely processed and acquired with 24-bit ADCs. This scheme allows a sub-micrometre orbit resolution to be achieved with robust and relatively simple hardware. The DOROS system is also equipped with dedicated channels optimised for processing beam oscillation signals. Data from these channels can be used to perform betatron coupling and beta-beating measurements. The achieved performance of the DOROS system triggered its installation on the beam position monitors located next to the LHC experiments for testing the system as an option of improving the beam orbit measurement in the most important LHC locations. After introducing the DOROS system, its performance is discussed through both, beam and laboratory measurements.

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MOPG10

BPM Stabiltiy Studies for the APS MBA Upgrade

ground-motion, diagnostics, vacuum, experiment

55

R.M. Lill, N. Sereno, B.X. Yang
ANL, Argonne, Illinois, USA

Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source (APS) is currently in the preliminary design phase for the multi -bend achromat (MBA) lattice upgrade. Beam stability is critical for the MBA and will require long term drift defined as beam motion over a seven-day timescale to be no more than 1 micron at the insertion device locations and beam angle change no more than 0.5 micro-radian. Mechanical stability of beam position monitor (BPM) pickup electrodes mounted on insertion device vacuum chambers place a fundamental limitation on long-term beam stability for insertion device beamlines. We present the design and implementation of using prototype mechanical motion system (MMS) instrumentation for quantifying this type of motion specifically in the APS accelerator tunnel and experiment hall floor under normal operating conditions. The MMS presently provides critical position information on the vacuum chamber and BPM support systems. Initial results of the R&D prototype systems have demonstrated that the chamber movements far exceed the long-term drift tolerance specified for the APS Upgrade MBA storage ring.

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MOPG14

The Use of Single-crystal CVD Diamond as a Position Sensitive X-ray Detector

synchrotron, photon, radiation, diagnostics

71

E. Griesmayer, P. Kavrigin, Ch. Weiss
CIVIDEC Instrumentation, Wien, Austria
C. Bloomer
DLS, Oxfordshire, United Kingdom

Synchrotron light sources generate intense beams of X-ray light for beamline experiments, and the stability of these X-ray beams has a large impact on the quality of the experiments that can be performed. User experiments increasingly utilise micro-focus techniques, focusing the X-ray beam size to below 10 microns at the sample point, with beamline detectors operating at kHz bandwidths. Thus, there is a demand for non-invasive diagnostic techniques that can reliably monitor the X-ray beam position with sub-micron accuracy in order to characterise X-ray beam motion, at corresponding kHz bandwidths. Reported in this paper are measurements from single-crystal CVD diamond detectors, and a comparison with the previous-generation of polycrystalline CVD diamond detectors is offered. Single-crystal diamond is shown to offer superior uniformity of response to incident X-rays, and excellent intensity and position sensitivity. Measurements from single-crystal diamond detectors installed at Diamond Light Source are presented, and their use in feedback routines in order to stabilise the X-ray beam at the sample point is discussed.

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MOPG19

Diamond Monitor Based Beam Loss Measurements in the LHC

injection, software, instrumentation, data-acquisition

82

C. Xu, B. Dehning, F.S. Domingues Sousa
CERN, Geneva, Switzerland
E. Griesmayer
CIVIDEC Instrumentation, Wien, Austria

Two pCVD diamond based beam loss monitors (dBLM) are installed near the primary collimators of the LHC, with a dedicated, commercial readout-system used to acquire their signals. The system is simultaneously able to produce a high sampling rate waveform and provide a real-time beam loss histogram for all bunches in the machine. This paper presents the data measured by the dBLM system during LHC beam operation in 2016.

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MOPG20

Optimized Beam Loss Monitor System for the ESRF

injection, electron, controls, vacuum

86

K.B. Scheidt, F. Ewald
ESRF, Grenoble, France
P. Leban
I-Tech, Solkan, Slovenia

Monitoring of the 6 GeV electron losses around the ESRF storage ring is presently done by a hybrid system consisting of ionization chambers and scintillators. It allows a rough localization of the losses, but has numerous limitations : size, weight, time-resolution, sensitivity, versatility, and costs. A new system was developed consisting of a detector head (BLD) and the electronics for signal acquisition and control (BLM). The BLD is compact, based on a scintillator coupled to a small photo-multiplier module. The BLM controls 4 independent BLDs and acquires data with sampling rates up to 125 MHz. Measurements performed on different configurations of BLD prototypes have lead to an optimized design that allows, together with the flexible signal processing performed in the BLM, to cover a wide range of applications: measurement of fast and strong losses during injection is just as well possible as detection of very small variations of weak losses during the slow current decay. This paper describes the BLD/BLM design, its functionality and performance characteristics, and shows results from prototypes installed in the injection zone and in close vicinity to in-vacuum undulators.

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MOPG21

Development of a Method for Continuous Functional Supervision of BLM Systems

monitoring, high-voltage, operation, electronics

90

C.F. Hajdu, C. Zamantzas
CERN, Geneva, Switzerland
T. Dabóczi, C.F. Hajdu
BUTE, Budapest, Hungary

It is of vital importance to provide a continuous and comprehensive overview of the functionality of beam loss monitoring (BLM) systems, with particular emphasis on the connectivity and correct operation of the detectors. At CERN, a new BLM system for the pre-accelerators of the LHC is currently at an advanced stage of development. This contribution reports on a new method which aims to automatically and continuously ensure the proper connection and performance of the detectors used in the new BLM system.

Poster MOPG21 [0.337 MB]

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MOPG22

Studies and Historical Analysis of ALBA Beam Loss Monitors

vacuum, storage-ring, injection, operation

94

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

During 5 years of operation in the 3 GeV storage ring of ALBA, the 124 beam loss monitors (BLM) have provided stable measurements of relative losses around the machine, with around 10% breakdown of units. We have analyzed these BLM failures and correlated the integrated received dose with any special conditions of each BLM location which might have led to their breakdown. We also show studies of beam losses in the insertion devices, with particular attention to the results in the multipole wiggler (MPW), where the vacuum chamber is (suspected to be) misaligned and high BLM counts are detected.

Poster MOPG22 [16.015 MB]

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MOPG27

The Design, Construction and Operation of the Beam Instrumentation for the High Intensity and Energy Upgrade of ISOLDE at CERN

diagnostics, target, cryomodule, operation

101

W. Andreazza, E. Bravin, E.D. Cantero, S. Sadovich, A.G. Sosa, R. Veness
CERN, Geneva, Switzerland
J.M. Carmona, J.H. Galipienzo, P.N.G. Noguera Crespo
AVS, Elgoibar, Spain

The High Intensity and Energy (HIE) upgrade to the on-line isotope separation facility (ISOLDE) facility at CERN is currently in the process of being commissioned. The very tight space available between the superconducting acceleration cavities and a challenging specification led to the design of a compact 'diagnostic box' with a number of insertable instruments on a common vacuum chamber. The box was conceived in partnership with the engineering firm AVS and produced as a completed assembly in industry. 14 diagnostic boxes have been installed and are now operational. This paper will describe the design, the construction and first results from operation of these HIE ISOLDE diagnostic boxes.

Poster MOPG27 [0.744 MB]

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MOPG36

Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector

timing, simulation, radiation, photon

123

J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei
NUAA, Nanjing, People's Republic of China

The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range*.
* L. Karsch, A. Bohm et al, "Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.

Poster MOPG36 [5.665 MB]

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MOPG42

Test Results from the Atlas Hybrid Particle Detector Prototype

ion, electron, radiation, cathode

147

C. Dickerson, B. DiGiovine, L.Y. Lin
ANL, Argonne, Illinois, USA
D. Santiago-Gonzalez
LSU, Baton Rouge, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
At the Argonne Tandem Linear Accelerator System (ATLAS) we designed and built a hybrid particle detector consisting of a gas ionization chamber followed by an inorganic scintillator. This detector will aid the tuning of low intensity beam constituents, typically radioactive, with relatively high intensity (>100x) contaminants. These conditions are regularly encountered during radioactive ion beam production via the in-flight method, or when charge breeding fission fragments from the CAlifornium Rare Isotope Breeder Upgrade (CARIBU). The detector was designed to have an energy resolution of ~5% at a rate of 10⁵ particles per second (pps), to generate energy loss and residual energy signals for the identification of both Z and A, to be compact (retractable from the beamline), and to be radiation hard. The combination of a gas ionization chamber and scintillator will enable the detector to be very versatile and be useful for a wide range of masses and energies. Design details and testing results from the prototype detector are presented in this paper.

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MOPG57

Temperature and Humidity Drift Characterization of Passive RF Components for a Two-Tone Calibration Method

laser, injection, radio-frequency, hardware

194

E. Janas, K. Czuba
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
E. Janas, U. Mavrič, H. Schlarb
DESY, Hamburg, Germany

Femtosecond-level synchronization is required for various systems in modern accelerators especially in fourth generation light sources. In those high precision synchronization systems the phase detection accuracy is crucial. However, synchronization to a low noise electrical source is corrupted by a phase detection error originating in the electrical components and connections due to thermal and humidity-related drifts. In future, we plan to implement calibration methods to mitigate these drifts. Those methods require a calibration signal injection, called second tone, into the system. Intrinsically, the injection circuit remains uncalibrated therefore it needs to be drift-free. We performed drift characterization of a set of RF components, which could serve for implementation of a signal injection circuit, namely selected types of couplers and splitters. We describe the measurement setup and discuss the challenges associated with this kind of measurement. Finally, we provide a qualitative and quantitative evaluation of the measurements results.

Poster MOPG57 [2.823 MB]

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MOPG58

Coherent Diffraction Radiation Imaging Methods to Measure RMS Bunch

electron, radiation, experiment, simulation

198

R.B. Fiorito, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
C.I. Clarke, A.S. Fisher
SLAC, Menlo Park, California, USA
A.G. Shkvarunets
UMD, College Park, Maryland, USA

The measurement of the RMS bunch length with high resolution is very important for latest generation light sources and also a key parameter for the optimization of the final beam quality in high gradient plasma accelerators. In this contribution we present progress in the development of novel single shot, RMS bunch length diagnostic techniques based on imaging the near and far fields of coherent THz diffraction radiation (CTHzDR) that is produced as a charged particle beam interacts with a solid foil or an aperture. Recent simulation results show that the profile of a THz image of the coherent point spread function (CSF) of a beam whose radius is less than the PSF, i.e. the image produced by a single electron, is sensitive to bunch length and can thus be used as a diagnostic. The advantages and disadvantages of near field and far field imaging are examined and the results of a recent high energy (20 GeV) CTHzDR experiments at SLAC/FACET are presented. Plans for experiments to further validate and compare these imaging methods for both moderate and high energy charged particle beams are also discussed.

Poster MOPG58 [1.067 MB]

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MOPG59

Time Correlated Single Photon Counting Using Different Photon Detectors

photon, operation, synchrotron, radiation

201

L. Torino, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Time Correlated Single Photon Counting (TCSPC) is used in accelerators to measure the filling pattern and perform bunch purity measurements. The most used photon detectors are photomultipliers (PMTs), generally used to detect visible light; and Avalanche Photo-Diodes (APDs), which are often used to detect X-rays. At ALBA synchrotron light source, the TCSPC using a standard PMT has been developed and is currently in operation and further tests are performed using an APD. This work presents the experimental results using both detectors, and compares their performances.

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MOPG62

Novel Grating Designs for a Single-Shot Smith-Purcell Bunch Profile Monitor

radiation, electron, vacuum, background

213

A.J. Lancaster, G. Doucas, H. Harrison, I.V. Konoplev
JAI, Oxford, United Kingdom

Funding: This work was supported by the STFC UK (grant ST/M003590/1) and the Leverhulme Trust (International Network Grant IN-2015-012). H. Harrison is supported by STFC UK and the JAI for her DPhil.
Smith-Purcell radiation has been successfully used to perform longitudinal profile measurements of electron bunches with sub-ps lengths. These measurements require radiation to be generated from a series of gratings to cover a sufficient frequency range for accurate profile reconstruction. In past systems the gratings were used sequentially and so several bunches were required to generate a single profile, but modern accelerators would benefit from such measurements being performed on a bunch by bunch basis. To do this the radiation from all three gratings would need to be measured simultaneously, increasing the mechanical complexity of the device as each grating would need to be positioned individually and at a different azimuthal angle around the electron beam. Investigations into gratings designed to displace the radiation azimuthally will be presented. Such gratings could provide an alternative to the rotated-grating approach, and would simplify the design of the single-shot monitor by reducing the number of motors required as all of the gratings could be positioned using a single mount.

Poster MOPG62 [1.088 MB]

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MOPG65

Frascati Beam-Test Facility (BTF) High Resolution Beam Spot Diagnostics

electron, real-time, diagnostics, software

221

P. Valente
INFN-Roma, Roma, Italy
B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
INFN/LNF, Frascati (Roma), Italy

Funding: Istituto Nazionale di Fisica Nucleare. Supported by the H2020 project AIDA-2020, GA no. 654168
The DAΦNE Beam Test Facility (BTF) is operational in Frascati since 2003. In the last years the beam diagnostics tools have been completely renewed and the services for users have been largely improved. We describe here the new transverse beam diagnostics based on new GEM TPC detectors and MEDIPIX Silicon pixel detectors, the renewed DAQ system and the data caching system based on MEMCACHED and the integration of the new sub-systems in the new data-logging. Results on the optimization of the transverse beam spot and divergence are reported as well as the real-time diagnostics and feedback user experience.

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MOPG68

Development and Commissioning of the Next Generation X-ray Beam Size Monitor in CESR

operation, vacuum, alignment, storage-ring

229

N.T. Rider, S.T. Barrett, M.G. Billing, J.V. Conway, B.K. Heltsley, A.A. Mikhailichenko, D.P. Peterson, D. L. Rubin, J.P. Shanks, S. Wang
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: Work supported by NSF grant PHY-0734867, PHY-1002467 and DOE grant DE-FC02-08ER41538, DE-SC0006505
The CESR Test Accelerator (CesrTA) program targets the study of beam physics issues relevant to linear collider damping rings and other low emittance storage rings. This endeavor requires new instrumentation to study the beam dynamics along trains of ultra-low emittance bunches. A key element of the program has been the design, commissioning and operation of an x-ray beam size monitor capable, on a turn by turn basis, of collecting single pass measurements of each individual bunch in a train over many thousands of turns. The x-ray beam size monitor development has matured to include the design of a new instrument which has been permanently integrated into the storage ring. A new beam line has been designed and constructed which allows for the extraction of x-rays from the positron beam using a newly developed electro magnet pair. This new instrument utilizes custom, high bandwidth amplifiers and digitization hardware and firmware to collect signals from a linear InGaAs diode array. This paper reports on the development of this new instrument and its integration into storage ring operation including vacuum component design, electromagnet design, electronics and capabilities.

Poster MOPG68 [4.624 MB]

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MOPG75

Single Shot Transversal Profile Monitoring of Ultra Low Charge Relativistic Electron Bunches at REGAE

electron, background, coupling, photon

257

H. Delsim-Hashemi
DESY, Hamburg, Germany

Relativistic electron microscopes are increasingly under consideration in dream experiments of observing atomic scale motions as they occur. Compared to ordinary electron microscopes with energies limited to few tens of keV, relativistic electrons reduce strongly the space-charge effects. This enables packing more electrons in shorter bunches and thereby capturing atomic scale ultra-fast dynamics in single shot. A typical relativistic-electron-microscope, based on an RF-gun, can provide experiments with couple of thousands to millions of electrons bunched in a few μm length and a transversal dimension of a fraction of a mm. After scattering from a sample and at the position of detector, electrons are distributed over transversal dimensions typically two orders of magnitude larger. For transversal diagnostics before scattering a cost effective solution is implemented while for diffraction pattern detection objective is single-electron imaging with good signal to noise ratio in single shot. In this contribution the implementations and results at REGAE will be presented.

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MOPG76

A Scintillating Fibre Beam Profile Monitor for the Experimental Areas of the SPS at CERN

ion, photon, radiation, proton

261

I. Ortega Ruiz, J. Spanggaard, G. Tranquille
CERN, Geneva, Switzerland
A. Bay, G.J. Haefeli
EPFL, Lausanne, Switzerland

The CERN Super Proton Synchrotron (SPS) delivers a wide spectrum of particle beams (hadrons, leptons and heavy ions) that can vary greatly in momentum and intensity. The profile and position of these beams are measured using particle detectors. However, the current systems show several problems that limit the quality of such monitoring. We have researched a new monitor made of scintillating fibres read-out with Silicon Photomultipliers (SiPM), which has the potential to perform better in terms of material budget, range of intensities measured and available detector size. In addition, it also has particle counting capabilities, extending its use to spectrometry or Time-Of-Flight measurements. Its radiation hardness is good to guarantee years of functioning. We have successfully tested a first prototype of this detector with different particle beams at CERN, giving accurate profile measurements over a wide range of energies and intensities. It only showed problems during operation with lead ion beams, believed to come from crosstalk between the fibres. Investigations are ongoing on alternative photodetectors, the electronics readout and solutions to the fibre crosstalk.

Poster MOPG76 [2.611 MB]

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TUAL02

A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity

neutron, photon, simulation, electron

277

J. Marroncle, A. Delbart, D. Desforge, C.L.H. Lahonde-Hamdoun, Ph. Legou, T. Papaevangelou, L. Segui, G. Tsiledakis
CEA/IRFU, Gif-sur-Yvette, France

Superconductive accelerators may emit X-rays and Gammas mainly due to high electric fields applied on the superconductive cavity surfaces. Indeed, electron emissions will generate photons when electrons impinge on some material. Their energies depend on electron energies, which can be strongly increased by the cavity radio frequency power when it is phase-correlated with the electrons. Such photons present a real problem for Beam Loss Monitor (BLM) systems since no discrimination can be made between cavity contributions and beam loss contributions. Therefore, a new BLM is proposed which is based on gaseous Micromegas detectors, highly sensitive to fast neutrons, not to thermal ones and mostly insensitive to X-rays and Gammas. This detector uses Polyethylene for neutron moderation and the detection is achieved using a 10B or 10B4C converter film with a Micromegas gaseous amplification. Simulations show that detection efficiencies > 8 % are achievable for neutrons with energies between 1 eV and 10 MeV.

Slides TUAL02 [1.248 MB]

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TUBL03

Synchronous Laser-Microwave Network for Attosecond-Resolution Photon Science

timing, laser, network, polarization

286

K. Shafak, F.X. Kärtner, A. Kalaydzhyan, O.D. Mücke, W. Wang, M. Xin
CFEL, Hamburg, Germany
F.X. Kärtner, M.Y. Peng, M. Xin
MIT, Cambridge, Massachusetts, USA

Funding: This work was supported by the Center for Free-Electron Laser Science at Deutsches Elektronen-Synchrotron, a research center of the Helmholtz Association in Germany.
Next-generation photon-science facilities such as X-ray free-electron lasers (X-FELs)* and intense-laser beamline centers** are emerging world-wide with the goal of generating sub-fs X-ray pulses with unprecedented brightness to capture ultrafast chemical and physical phenomena with sub-atomic spatiotemporal resolution. The only obstacle preventing this long-standing scientific dream to come true is a high- precision timing distribution system*** synchronizing various microwave and optical sub-sources across multi-km distances which is required for seeded X-FELs and attosecond pump-probe experiments. Here, we present, for the first time, a synchronous laser-microwave network that will enable attosecond precision photon science facilities. By developing new ultrafast metrological timing devices and carefully balancing fiber nonlinearities and fundamental noise contributions, we have achieved timing stabilization of a 4.7 km fiber network with 580 attosecond precision over 52 hours. Furthermore, we have realized a complete laser-microwave network incorporating two mode-locked lasers and one microwave source with total 950 attosecond jitter integrated from 1 microsecond to 18 hours.
*J. Stohr, LCLS-II Conceptual Design Report. No. SLAC-R-978. (SLAC, 2011).
**G. Mourou, T. Tajima, Optics & Photonics News 22, 47 (2011).
***J. Kim, et al., Nat. Photonics 2(12), 733-736 (2008).

Slides TUBL03 [11.692 MB]

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TUPG03

Accurate Bunch Resolved BPM System

storage-ring, operation, FPGA, diagnostics

311

F. Falkenstern, F. Hoffmann, J. Kuszynski, M. Ries
HZB, Berlin, Germany

Operation with multiple beams stored on different orbits in storage rings as well as beam dynamics studies requires accurate and stable Beam Position Monitor (BPM) measurements for each individual bunch. Analog BPM systems are usually optimized for measuring the closed orbit, i.e. averaging over all buckets and many turns. Therefore no information about the position of individual bunches are supplied. The new bunch resolved BPM electronic, currently under development at HZB, is based on the analysis of RF-signals delivered by a set of four stripline / pick-up electrodes in each beam position monitor. It has a high spatial resolution over a wide range of bunch currents. Using the four well matched (phase and amplitude) bunch induced RF-signals in combination with a low jitter master clock and commercial data acquisition cards allow beam position measurements on a bunch to bunch basis with micrometer resolution. Experimental results obtained at BESSY II and MLS demonstrates the achieved performance of the setup and will be discussed in detail.

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TUPG10

LCLS-1 Cavity BPM Algorithm for Unlocked Digitizer Clock

cavity, timing, operation, dipole

336

T. Straumann, S.R. Smith
SLAC, Menlo Park, California, USA

Funding: Work supported by U.S. Department of Energy Contract No. DE-AC02-76SF00515
Cavity BPMs commonly use the fundamental TM010 mode (excited either in the x/y cavity itself or in a separate "reference" cavity) which is insensitive to beam position as a reference signal, not only for amplitude normalization but also as a phase/time reference to facilitate synchronous detection of the signal derived from the position-sensitive TM110 mode. When taking these signals into the digital domain the reference and position signals need to be acquired by a synchronous clock. However, unless this clock is also locked to the accelerating RF, absolute timing information is lost which affects the relative phase between reference and position signals (assuming they are not carefully tuned to the same frequency). This contribution presents a method for estimating the necessary time of arrival information based on the sampled reference signal which is used to make the signal detection insensitive to the phase of the digitizer clock. Running an unlocked digitizer clock allows for considerable simplification of infrastructure (cabling, PLLs) and thus decreases cost and eases maintenance.

Poster TUPG10 [1.100 MB]

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TUPG20

The CMS Beam Halo Monitor at the LHC: Implementation and First Measurements

background, experiment, vacuum, luminosity

364

N. Tosi
INFN-Bologna, Bologna, Italy

A Cherenkov based detector system has been installed at the Large Hadron Collider (LHC), in order to measure the Machine Induced Background (MIB) for the Compact Muon Solenoid (CMS) experiment. The system is composed of forty identical detector units formed by a cylindrical Quartz radiator directly coupled to a Photomultiplier. These units are installed at a radius of 1.8m and a distance of 20.6 m from the CMS interaction point. The fast and direction-sensitive signal allows to measure incoming MIB particles while suppressing the much more abundant collision products and albedo particles, which reach the detector at a different time and from a different direction. The system readout electronics is based on the QIE10 ASIC and a uTCA based back-end, and it allows a continuous online measurement of the background rate separately per each bunch. The detector has been installed in 2015 and is now fully commissioned. Measurements demonstrating the capability of detecting anomalous beam conditions will be presented.
on behalf of the CMS collaboration

Poster TUPG20 [2.609 MB]

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TUPG22

Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector

timing, simulation, radiation, photon

372

J. Zhu, M.H. Fang, J. Wang, Z.Y. Wei
NUAA, Nanjing, People's Republic of China

The real event selection, timing resolution, position resolution and energy response of the EJ-200 plastic scintillation detector have been analyzed using timing window coincidence measurement. The detector was simulated based on Monte Carlo, including its geometry, energy deposition, photon collection and signal generation. The detection efficiency and the real events selection have been obtained while the background noise has been reduced by using two-end readout timing window coincidence. We developed an off-line analysis code, which is suitable for massive data from the digitizer. We set different coincidence timing windows, and did the off-line data processing respectively. We find the detection efficiency increases as the width of the timing window increases, and when the width of timing window is more than 10ns, the detection efficiency will slowly grow until it reaches saturation. Time, position and energy response have been measured by exposing to radioactive sources. The best timing window parameter as 16ns is obtained for on-line coincidence measurement, and the position resolution is up to 12cm. Energy response of the detector was linear within the experimental energy range*.
* L. Karsch, A. Bohm et al,"Design and Test of A Large-area Scintillation Detector for Fast Neutrons", Nuclear Instruments and Methods in Physics Research A, vol.460, pp.362-367, 2001.

Poster TUPG22 [5.665 MB]

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TUPG23

Use CR-39 Plastic Dosimeters for Beam Ion Halo Measurements

proton, linac, diagnostics, software

376

I. Eliyahu, A. Cohen, E. Daniely, B. Kaizer, A. Kreisler, A. Perry, A. Shor, L. Weissman
Soreq NRC, Yavne, Israel

Beam halo and growth of beam emittance are important issues for high-intensity linear accelerators. Beam-dynamic predictions of weak beam tails are usually not reliable due to complexity of the non-linear effects leading to halo formation. Therefore, development of a simple method for beam halo diagnostics is highly desirable. The first testing of CR-39 solid-state nuclear track dosimeters for beam halo measurement were performed at the SARAF phase I accelerator with a few MeV proton beams. Beam pulses of 90 nA peak intensity of shortest possible duration (15 ns) were used for direct irradiation of standard CR-39 personal dosimetry tags. Other irradiations were done with beam pulses of 200 ns duration and of 1 mA peak intensity. Specially prepared large area CR-39 plates with central hole for the beam core transport were used in these tests. Weak beam structures were clearly observed in the both types of irradiation. The tests showed feasibility of beam halo measurements down to resolution level of a single proton. The optimum CR-39 etching conditions were established. The advantages and drawback of the method are discussed.

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TUPG27

Beam Diagnostics for Medical Accelerators

proton, diagnostics, ion, network

387

C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement No 675265.
The Optimization of Medical Accelerators (OMA) is the aim of a new European Training Network that has received 4 ME of funding within the Horizon 2020 Programme of the European Union. OMA joins universities, research centers and clinical facilities with industry partners to address the challenges in treatment facility design and optimization, numerical simulations for the development of advanced treatment schemes, and beam imaging and treatment monitoring. This contribution presents an overview of the network's research into beam diagnostics and imaging. This includes investigations into applying detector technologies originally developed for high energy physics experiments (such as VELO, Medipix) for medical applications; integration of prompt gamma cameras in the clinical workflow; identification of optimum detector configurations and materials for high resolution spectrometers for proton therapy and radiography; ultra-low charge beam current monitors and diagnostics for cell studies using proton beams. It also summarizes the network-wide training program consisting of Schools, Topical Workshops and Conferences that will be open to the wider medical and accelerator communities.

Poster TUPG27 [0.388 MB]

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TUPG40

The Cherenkov Detector for Proton Flux Measurement (CpFM) in the UA9 Experiment

experiment, proton, radiation, vacuum

430

S. Montesano, W. Scandale
CERN, Geneva, Switzerland
F.M. Addesa, G. Cavoto, F. Iacoangeli
INFN-Roma, Roma, Italy
L. Burmistrov, S. Dubos, V. Puill, W. Scandale, A. Stocchi
LAL, Orsay, France

The UA9 experiment at the CERN SPS investigates the possibility to use bent crystals to steer particles in high energy accelerators. In this framework the CpFM have been developed to measure the beam particle flux in different experimental situations. Thin movable fused-silica bars installed in the SPS primary vacuum and intercepting the incoming particles are used to radiate Cherenkov light. The light signal is collected outside the beam pipe through a quartz optical window by radiation hard PMTs. The PMT signal is readout by the WaveCatcher acquisition board, which provides count rate as well as waveform information over a configurable time window. A bundle of optical fibers can be used to transport the light signal far from the beam pipe, allowing to reduce the radiation dose to the PMT. A first version of the CpFM has been successfully commissioned during the data taking runs of the UA9 Experiment in 2015, while a second version has been installed in the TT20 extraction line of the SPS in 2016. In this contribution the design choices will be presented and the final version of the detector will be described in detail.

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TUPG42

Design of a Very Compact 130 MeV Møller Polarimeter for the S-DALINAC

electron, target, polarization, scattering

438

T. Bahlo, J. Enders, T. Kürzeder, N. Pietralla, J. Wissmann
TU Darmstadt, Darmstadt, Germany

Funding: Supported by the DFG through grants SFB 634 and GRK 2128
At the Superconducting Darmstadt Linear Accelerator S-DALINAC it is possible to accelerate electron beams to a maximum energy of up to 130 MeV. In the S-DALINAC Polarized Injector SPIN polarized electrons with a polarization of up to 86% can be produced. The polarization can be measured with two already mounted Mott polarimeters in the injector beamline where the electrons can have energies of up to 10 MeV. To allow polarization measurements behind the main accelerator a Moeller polarimeter suitable for energies between 50 MeV and 130 MeV is currently being developed. The rather low and variable beam energies result in a big and also variable scattering angle distribution. Combined with strict spatial boundary conditions at the designated mounting area necessitate a very compact set-up for the polarimeter. In addition to an overview over the planned polarimeter we will present drafts of the target chamber, the beam separation chamber including a angle-defining aperture and the separation dipole as well as the beamline to the detectors and the beam dump.

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TUPG53

Bunch Arrival-Time Monitoring for Laser Particle Accelerators and Thomson Scattering X-Ray Sources

laser, electron, timing, pick-up

468

J.M. Kraemer, M. Kuntzsch, U. Lehnert, P. Michel, U. Schramm
HZDR, Dresden, Germany
J.P. Couperus, A. Irman, A. Koehler, O. Zarini
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany

The ELBE center of high power radiation sources at Helmholtz-Zentrum Dresden-Rossendorf combines a superconducting CW linear accelerator with Terawatt- and Petawatt-level laser sources. Key experiments rely on precise timing and synchronization between the different radiation pulses. An online single shot monitoring system has been set up in order to measure the timing between the high-power Ti:Sa laser DRACO and electron bunches generated by the conventional SRF accelerator. This turnkey timing system is suitable for timing control of Thomson scattering X-ray sources and external injection of electron bunches into a laser wakefield accelerator. It uses a broadband RF pickup to acquire a probe of the particle bunch's electric field and modulates a fraction of the high power laser pulse in a fast electro-optical modulator. The amplitude modulation gives a direct measure for the timing between both beams. Using this setup a resolution of <200 fs RMS has been demonstrated. The contribution will show the prototype, first measurement results and will discuss future modification in order to improve the resolution of the system.

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TUPG54

Novel Approach to the Elimination of Background Radiation in a Single-Shot Longitudinal Beam Profile Monitor

radiation, polarization, background, electron

471

H. Harrison, G. Doucas, I.V. Konoplev, A.J. Lancaster, H. Zhang
JAI, Oxford, United Kingdom
A. Aryshev, M. Shevelev, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan

It is proposed to use the polarization of coherent Smith-Purcell radiation (cSPr) to distinguish between the cSPr signal and background radiation in a single-shot longitudinal bunch profile monitor. A preliminary measurement of the polarization has been carried out using a 1mm periodic metallic grating installed at the 8MeV electron accelerator LUCX, KEK (Japan). The measured degree of polarization at '=90° (300GHz) is 72.6 ±%. To make a thorough test of the theoretical model, measurements of the degree of polarization must be taken at more emission angles - equivalent to more frequencies.
This work was supported (in parts) by the: STFC UK, the Leverhulme Trust, JAI University of Oxford and the Photon and Quantum Basic Research Coordinated Development (Japan).

Poster TUPG54 [0.432 MB]

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TUPG57

5 MeV Beam Diagnostics at the Mainz Energy-Recovering Superconducting Accelerator MESA

diagnostics, cavity, dipole, beam-diagnostic

479

S. Heidrich, K. Aulenbacher
IKP, Mainz, Germany

Within the next few years a new energy recovering superconducting electron accelerator will be built at the institute for nuclear physics in Mainz. To adjust the properties of the beam correctly to the first acceleration in the superconducting cavities, a high resolution longitudinal beam diagnosis is required at the 5 MeV injection arc. The system employs two 90-degree vertical deflection dipoles to achieve an energy resolution of 500 eV and a phase resolution of 60 micrometers. As a second challenge the transverse emittance measurements will take place at full beam current. This demands an extremely heat resistant diagnosis system, realized by a method similar to flying wire.

Poster TUPG57 [6.090 MB]

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TUPG59

Bunch Extension Monitor for LINAC of SPIRAL2 Project

linac, ion, positron, diagnostics

486

R.V. Revenko, J.L. Vignet
GANIL, Caen, France

A semi-interceptive monitor for bunch shape measure-ment has been developed for the LINAC of SPIRAL2. A Bunch Extension Monitor (BEM) is based on the registra-tion of X-rays emitted by the interaction of the beam ions with a thin tungsten wire. The time difference between detected X-rays and accelerating RF gives information about distribution of beam particles along the time axis. These monitors will be installed inside diagnostic boxes on the first five warm sections of the LINAC. The monitor consists of two parts: X-ray detector and mechanical system for positioning the tungsten wire into the beam. Emitted X-rays are registered by microchannel plates with fast readout. Signal processing is performed with constant fraction discriminators and TAC coupled with MCA. Results of bunch shape measurements obtained during commissioning of RFQ for SPIRAL2 are presented.

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TUPG64

Bunch Length Measurement Based on Interferometric Technique by Observing Coherent Transition Radiation

electron, radiation, linac, gun

498

I. Nozawa, M. Gohdo, K. Kan, T. Kondoh, J. Yang, Y. Yoshida
ISIR, Osaka, Japan

Generation and diagnosis of ultrashort electron bunches are one of the main topics of accelerator physics and applications in related scientific fields. In this study, ultrashort electron bunches with bunch lengths of femtoseconds and bunch charges of picocoulombs were generated from a laser photocathode RF gun linac and an achromatic arc-type bunch compressor. Observing coherent transition radiation (CTR) emitted from the electron bunches using a Michelson interferometer, the interferograms of CTR were measured experimentally. The bunch lengths were diagnosed by performing a model-based analysis of the interferograms of CTR.

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TUPG66

High-Energy X-Ray Pinhole Camera for High-Resolution Electron Beam Size Measurements

photon, operation, emittance, electron

504

B.X. Yang, S.H. Lee, J.W. Morgan, H. Shang
ANL, Argonne, Illinois, USA

Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source (APS) is developing the design of a multi-bend achromat (MBA) lattice based storage ring as the next major upgrade, featuring a 20-fold reduction in emittance. Combining the reduction of beta functions, the electron beam sizes at bend magnet sources may be reduced to reach 5 - 10 μm for 10% vertical coupling. The x-ray pinhole camera currently used for beam size monitoring will not be adequate for the new task. By increasing the operating photon energy to 120 keV or higher, the pinhole camera's resolution is expected to reach below 4 μm. The peak height of the pinhole image will be used to monitor relative changes of the beam sizes and enable the feedback control of the emittance. We present the computer simulation and the design of a prototype beam size monitor for the APS storage ring.

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TUPG68

Study of the Radiation Damage on a Scintillating Fibers Based Beam Profile Monitor

radiation, factory, proton, extraction

512

E. Rojatti, G.M.A. Calvi, L. Lanzavecchia, A. Parravicini, C. Viviani
CNAO Foundation, Milan, Italy

The Scintillating Fibers Harp (SFH) monitors are the beam profile detectors used in the High Energy Beam Transfer (HEBT) lines of the CNAO (Centro Nazionale Adroterapia Oncologica, Italy) machine. The use of scintillating fibers coupled with a high-resolution CCD camera makes the detector of simple architecture and with high performances (less than 0.5mm resolution and 50Hz frame rate); on the other hand, fibers radiation damage shall be faced after some years of operation. The damage appears in multiple ways, as efficiency loss in light production, delayed light emission, attenuation length reduction. The work presents measurements and analysis performed to understand the phenomenon, in such a way to deal with it as best as possible. The connection between dose rate, integral dose and damage level is investigated as well as the possible recovery after a period of no irradiation. The influence of the damage effects on profiles reconstruction and beam parameters calculation is studied. Data elaboration is modified in such a way to compensate radiation damage effects and protract the SFH lifetime, before the major intervention of fibers replacement. Methods and results are discussed.

Poster TUPG68 [1.244 MB]

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TUPG71

Ionization Profile Monitor Simulations - Status and Future Plans

simulation, electron, ion, space-charge

520

M. Sapinski, P. Forck, T. Giacomini, R. Singh, S. Udrea, D.M. Vilsmeier
GSI, Darmstadt, Germany
F. Belloni, J. Marroncle
CEA/IRFU, Gif-sur-Yvette, France
B. Dehning, J.W. Storey
CERN, Geneva, Switzerland
K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
C.A. Thomas
ESS, Lund, Sweden
R.M. Thurman-Keup
Fermilab, Batavia, Illinois, USA
C.C. Wilcox, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Nonuniformities of the extraction fields, the velocity distribution of electrons from ionization processes and strong bunch fields are just a few of the effects affecting Ionization Profile Monitor measurements and operation. Careful analysis of these phenomena require specialized simulation programs. A handful of such codes has been written independently by various researchers over the recent years, showing an important demand for this type of study. In this paper we describe the available codes and discuss various approaches to Ionization Profile Monitor simulations. We propose benchmark conditions to compare these codes between themselves and we collect data from various devices to benchmark codes against the measurements. Finally we present a community effort with a goal to discuss the codes, exchange simulation results and to develop and maintain a new, common codebase.

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TUPG72

Calibration of X-ray Monitor during the Phase I of SuperKEKB commissioning

emittance, factory, scattering, optics

524

E. Mulyani
Sokendai, Ibaraki, Japan
J.W. Flanagan
KEK, Ibaraki, Japan

X-ray monitors (XRM) have been installed in each SuperKEKB ring, the Low Energy Ring (LER) and High Energy Ring (HER), primarily for vertical beam size measurement. Both rings have been commissioned in Phase I of SuperKEKB operation (February-June 2016), and several XRM calibration studies have been carried out. The geometrical scale factors seems to be well understood for both LER and HER. The emittance knob ratio method yielded results consistent with expectations based on the machine model optics (vertical emittance ε_y is {§I{≈8}{pm}}). For the HER, the vertical emittance ε_y is {§I{≈41}{pm}}, which is 4× greater than the optics model expectation. Analysis of beam size and lifetime measurements suggests unexpectedly large point response functions, particularly in the HER.

Poster TUPG72 [34.615 MB]

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TUPG76

Performance Studies of Industrial CCD Cameras Based on Signal-To-Noise and Photon Transfer Measurements

photon, electron, diagnostics, background

540

G. Kube
DESY, Hamburg, Germany

Taking advantage of the rapid development and the huge market for commercial available optical sensors, in the past years optical measuring techniques took on greater significance. Nowadays, area scan CCD or CMOS sensors are widely used for beam profile diagnostics. They provide the full two-dimensional information about the particle beam distribution, allowing in principle to investigate shot-to-shot profile fluctuations at moderate repetition rates. In order to study the performance and to characterize these cameras, photon transfer is a widely applied popular and valuable testing methodology. In this contribution, studies based on signal-to-noise and photon transfer measurements are presented for CCD cameras which are in use for beam profile diagnostics at different DESY accelerators.

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TUPG77

Experimental Results of a Compact Laserwire System for Non-Invasive H⁻ Beam Profile Measurements at CERN's Linac4

laser, linac, electron, optics

544

S.M. Gibson, G.E. Boorman, A. Bosco
Royal Holloway, University of London, Surrey, United Kingdom
T. Hofmann, U. Raich, F. Roncarolo
CERN, Geneva, Switzerland

Funding: Support from UK STFC, grant ST/N001753/1.
A non-invasive laserwire system is being developed for quasi-continuous monitoring of the transverse profile and emittance of the final 160 MeV beam at CERN's LINAC4. As part of these developments, a compact laser-based profile monitor was recently tested during LINAC4 commissioning at beam energies of 50 MeV, 80 MeV and 10⁷ MeV. A laser with a tunable pulse width (1-300 ns) and ~200 W peak power in a surface hutch delivers light via a 75 m LMA transport fibre to the accelerator. Automated scanning optics deliver a free space <150 micron width laserwire to the interaction chamber, where a transverse slice of the hydrogen ion beam is neutralised via photo-detachment. The liberated electrons are deflected by a low field dipole and captured by a sCVD diamond detector, that can be scanned in synchronisation with the laserwire position. The laserwire profile of the LINAC4 beam has been measured at all commissioning energies and is found in very good agreement with interpolated profiles from conventional SEM-grid and wire scanner measurements, positioned up and downstream of the laserwire setup. Improvements based on these prototype tests for the design of the final system are presented.

Poster TUPG77 [3.695 MB]

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TUPG82

Preliminary Measurement on Potential Luminescent Coating Material for the ESS Target Imaging Systems

target, proton, controls, coupling

559

C.A. Thomas, M.A. Hartl, Y. Lee, T.J. Shea
ESS, Lund, Sweden
E. Adli, H. Gjersdal, M.R. Jaekel, O. Rohne
University of Oslo, Oslo, Norway
S. Joshi
University College West, Trollhätan, Sweden

We present in this paper the preliminary measurements performed on luminescent materials to be investigated and eventually coated on the ESS target wheel, the Proton Beam Window separating the end of the ESS Linac and the entrance of the ESS target area, and the ESS Dump. Among all the properties of the luminescent material required for the target imaging systems, luminescence yield and luminescent lifetime are essential for two reasons. The first one is trivial, since this material is the source for the imaging system and sets its potential performance. The lifetime is not generally of importance, unless the object is moving, or time dependence measurements are to be done. In our case, the target wheel is moving, and measurement of the beam density current may have to be performed at the 10μups scale. Thus luminescence lifetime of the coating material should be known and measured. In this paper, we present the luminescence measurements of the photo-luminescent lifetime of several materials currently under studies to be used eventually for the first beam on target.

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WEPG07

A Heterogeneous FPGA/GPU Architecture for Real-Time Data Analysis and Fast Feedback Systems

GPU, FPGA, monitoring, data-analysis

626

M. Vogelgesang, L.E. Ardila Perez, M. Caselle, S.A. Chilingaryan, A. Kopmann, L. Rota, M. Weber
KIT, Eggenstein-Leopoldshafen, Germany

We propose a versatile and modular approach for a real-time data acquisition and evaluation system used for monitoring and feedback control in beam diagnostic and photon science experiments. Our hybrid architecture is based on an FPGA readout card* and a GPU for data processing. To increase throughput, lower latencies and reduce overall system strain, the FPGA write data directly in the GPU. After real-time data analysis the GPU writes back results either directly to the FPGA in case of fast feedback systems or to the CPU host system for storage. Communication and scheduling are handled transparently by our processing framework**. However, users can customize and extend it with their own processing plugins. Although the system is designed for real-time purposes, the modular approach also allows standalone usage for high-speed off-line analysis. We evaluated the performance of our solution measuring both processing times of data analysis algorithms used with beam instrumentation detectors as well as transfer times between FPGA and GPU. The latter suggests throughputs of up to 6.5 GB/s with latencies down to tens of microseconds, thus making it suitable for fast feedback systems.
* A PCIe DMA Architecture for Multi-Gigabyte Per Second Data Transmission, 10.1109/TNS.2015.2426877
** A Scalable GPU-based Image Processing Framework for On-line Monitoring, 10.1109/HPCC.2012.116

Poster WEPG07 [17.144 MB]

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WEPG23

Evaluating Beam-Loss Detectors for LCLS-2

ion, electron, linac, radiation

678

A.S. Fisher, R.C. Field, L.Y. Nicolas
SLAC, Menlo Park, California, USA

The LCLS x-ray FEL occupies the third km of the 3-km SLAC linac, which accelerates electrons in copper cavities pulsed at 120 Hz. For LCLS-2, the first km of linac will be replaced with superconducting cavities driven by continuous RF at 1300 MHz. The normal-conducting photocathode gun will also use continuous RF, at 186 MHz. The laser pulse rate will be variable up to 1 MHz. With a maximum beam power of 250 kW initially, and eventually 1 MW, the control of beam loss is critical for machine and personnel safety, especially since losses can continue indefinitely in linacs and dark current emitted in the gun or cavities can be lost at any time. SLAC protection systems now depend on ionization chambers, both local devices at expected loss sites and long gas-dielectric coaxial cables for distributed coverage. However, their ion collection time is over 1 ms, far slower than the beam repetition rate. We present simulations showing that with persistent losses, the space charge of accumulated ions can null the electric field inside the detector, blinding it to an increase in loss. We also report on tests comparing these detectors to faster alternatives.

Poster WEPG23 [6.589 MB]

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WEPG33

The Measurement and Controlling System of Beam Current for Weak Current Accelerator

electron, target, controls, gun

697

J.H. Yue, Y. Li, Z.J. Ma, Y. Xie, L. Yu
IHEP, Beijing, People's Republic of China

For some detectors' calibration, a very weak electron current provided by accelerator is necessary. In order to control the beam current to the detector, 8 movable slits in which the position resolution of the stoppers is better than 5μm are installed along the accelerator. For the weak current measurement, 9 movable current monitors based on scintillator are installed along the beam line. These monitors can measure the very weak current, even to several electrons. The monitors can be pulled away the beam axis when the electron beam goes to the downstream.

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WEPG34

Heavy Ion Beam Flux and In-situ Energy Measurements at High LET

ion, heavy-ion, cyclotron, radiation

700

S. Mitrofanov, I.V. Kalagin, V.A. Skuratov, Yu.G. Teterev
JINR, Dubna, Moscow Region, Russia
V.S. Anashin
United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia

The Russian Space Agency with the TL ISDE involvement has been utilizing ion beams from oxygen up to bismuth delivered from cyclotrons of the FLNR JINR accelerator complex for the SEE testing during last seven years. The detailed overview of the diagnostic set-up features used for low intensity ion beam parameters evaluation and control during the corresponding experiments is presented. Special attention is paid to measurements of ion flux and energy at high LET levels and evaluation of ion beam uniformity over large (200x200 mm) irradiating areas. The online non-invasive (in-situ) time of flight technique designed for low intensity ion beam energy measurements based on scintillation detectors is considered in details. The system has been successfully commissioned and is used routinely in the SEE testing experiments.

Poster WEPG34 [7.361 MB]

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WEPG35

Design of an Electron Cloud Detector in a Quadrupole Magnet at CesrTA

electron, quadrupole, simulation, vacuum

704

J.P. Sikora, S.T. Barrett, M.G. Billing, J.A. Crittenden, K.A. Jones, Y. Li, T.I. O'Connell
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: This work is supported by the US National Science Foundation PHY-0734867, PHY-1002467 and the US Department of Energy DE-FC02-08ER41538, DE-SC0006505.
We have designed a detector that measures the electron cloud density in a quadrupole magnet using two independent techniques. Stripline electrodes collect electrons that would otherwise impact the beam-pipe surface. The striplines are placed behind an array of small holes in the beam-pipe wall in order to shield them from the beam-induced electromagnetic pulse. There are three striplines placed near one of the pole tips so that they cover a roughly 0.43 radian azimuth. The beam-pipe chamber has also been designed so that microwave measurements of the electron cloud density can be performed. Beam position monitor buttons have been included for excitation and reception of microwaves and the chamber has been designed so that the resonant microwaves are confined to be within the 56 cm length of the quadrupole field. This paper provides some details of the design including CST Microwave Studio time domain simulation of the stripline detectors and eigenmode simulation of the resonant chamber. The detector is installed in the Cornell Electron Storage Ring and is part of the test accelerator program for the study of electron cloud using electron and positron beams from 2 to 5 GeV.

Poster WEPG35 [2.166 MB]

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WEPG46

KALYPSO: A Mfps Linear Array Detector for Visible to NIR Radiation

laser, diagnostics, electron, real-time

740

L. Rota, B.M. Balzer, M. Caselle, A.-S. Müller, M.J. Nasse, G. Niehues, P. Schönfeldt, M. Weber
KIT, Eggenstein-Leopoldshafen, Germany
C. Gerth, B. Steffen
DESY, Hamburg, Germany
N. Hiller, A. Mozzanica
PSI, Villigen PSI, Switzerland
D.R. Makowski, A. Mielczarek
TUL-DMCS, Łódź, Poland

Funding: This work is partially funded by the BMBF contract number: 05K16VKA.
The acquisition rate of commercially available line array detectors is a bottleneck for beam diagnostics at high-repetition rate machines like synchrotron lightsources or FELs with a quasi-continuous or macro-pulse operation. In order to remove this bottleneck we have developed KALYPSO, an ultra-fast linear array detector operating at a frame-rate of up to 2.7 Mfps. The KALYPSO detector mounts InGaAs or Si linear array sensors to measure radiation in the near-infrared or visible spectrum. The FPGA-based read-out card can be connected to an external data acquisition system through a high-performance PCI-Express 3.0 data-link, allowing continuous data taking and real-time data analysis. The detector is fully synchronized with the timing system of the accelerator and other diagnostic instruments. The detector is currently installed at several accelerators: ANKA, the European XFEL and TELBE. We present the detector and the results obtained with Electro-Optical Spectral Decoding (EOSD) setups.

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WEPG50

Non-Invasive Bunch Length Diagnostics of Sub-Picosecond Beams

pick-up, simulation, vacuum, real-time

756

S.V. Kuzikov, A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia
S.P. Antipov, S.V. Kuzikov
Euclid TechLabs, LLC, Solon, Ohio, USA
S.V. Kuzikov
UNN, Nizhny Novgorod, Russia

Funding: This work was partially supported by the Russian Scientific Foundation (grant #16-19-10448).
We propose a non-invasive bunch length measurement system based on RF pickup interferometry. A device performs interferometry between two broadband wake signals generated by a single short particle bunch. The mentioned wakes are excited by two consequent small gaps in beam channel. A field pattern formed by interference of the mentioned two coherent wake signals is registered by means of detector arrays placed at outer side of beam channel. The detectors are assumed to be low-cost integrating detectors (pyro-detectors or bolometers) so that integration time is assumed to be much bigger than bunch length. Because RF signals come from gaps to any detector with different time delays which depend on particular detector coordinate, the array allows to substitute measurements in time by measurements in space. Simulations with a 1 ps beam and a set of two 200 micron wide vacuum breaks separated by 0.5 mm were done using CST Particle Studio. These simulations show good accuracy. Moreover, one can recover the detailed temporal structure of the measured pulse using a new developed synthesis procedure.

Poster WEPG50 [2.780 MB]

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WEPG55

Synchronization of ps Electron Bunches and fs Laser Pulses Using a Plasmonics-Enhanced Large-Area Photoconductive Detector

electron, laser, quadrupole, vacuum

774

E.J. Curry, M. Jarrahi, P. Musumeci, N.T. Yardimci
UCLA, Los Angeles, California, USA
B.T. Jacobson
RadiaBeam, Santa Monica, California, USA

Temporal synchronization between short relativistic electron bunches and laser pulses at the ps and sub-ps level is required for accelerator applications like inverse Compton light sources. Photoconductive antennas with THz and sub-THz bandwidth which are gated by fs lasers provide this level of timing resolution. This paper describes the operating principals of the diagnostic along with bench-top experimental results with recently developed plasmonics-enhanced large-area devices. A vacuum chamber with robust electronic noise reduction has been designed for upcoming beam-based experiments.

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WEPG56

Single-Shot THz Spectroscopy for the Characterization of Single-Bunch Bursting CSR

impedance, radiation, electron, operation

778

J. Raasch, M. Arndt, J. Hänisch, K.S. Ilin, K. Kuzmin, A.-S. Müller, A. Schmid, M. Siegel, J.L. Steinmann, S. Wuensch
KIT, Karlsruhe, Germany
G. Cinque, M. Frogley
DLS, Oxfordshire, United Kingdom
B. Holzapfel
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

Funding: The work was supported by the BMBF (05K13VK4), the Helmholtz International Research School for Teratronics & the Karlsruhe School of Elementary Particle and Astroparticle Physics.
An integrated array of narrow-band high-Tc YBa2Cu3O7-x (YBCO) detectors embedded in broad-band readout was developed for the future use at synchrotron light sources as a single-shot terahertz (THz) spectrometer. The detection system consists of up to four thin-film YBCO nanobridges fed by planar double-slit antennas covering the frequency range from 140 GHz up to 1 THz. We present first results obtained at the ANKA storage ring and at Diamond Light Source during operation of two and four frequency-selective YBCO detectors, respectively.

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reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG56

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WEPG57

Single-Shot THz Spectrometer for Bunch Length Measurements

radiation, electron, diagnostics, alignment

782

S.V. Kutsaev, A.Y. Murokh, M. Ruelas, H.L. To
RadiaBeam Systems, Santa Monica, California, USA
V. Goncharik
Logicware Inc, New York, USA

Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under contract DE-SC0013684
We present a new diagnostics instrument designed to measure bunch length in RF particle accelerators. Typically, scanning-type Michelson or Martin-Puplett interferometers are used to measure the coherent radiation from a short bunch. However, they require averaging over several shots over several minutes, thus being able to report only the average bunch length. We propose to measure the emitted coherent spectrum of a short bunch emission that contains the same spectral information as the bunch shape by means of single-shot spectrometry. In this paper we present design considerations, and first experimental results obtained at FACET for the instrument that allows shot-to-shot measurement of the emitted spectrum.

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WEPG61

Theory of X-Ray Transition Radiation from Graphene for Transition Radiation Detectors

radiation, electron, plasma, target

788

A.A. Tishchenko, A. Romaniouk, D.Yu. Sergeeva, M.N. Strikhanov
MEPhI, Moscow, Russia

We present the theory of transition radiation for monolayers in X-ray domain from the first principles and consider the pros and cons of using graphene-monolayer in transition radiation detectors.

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WEPG67

Non-Invasive Beam Profile Measurement for High Intensity Electron Beams

electron, laser, photon, background

803

T. Weilbach, K. Aulenbacher, M.W. Bruker
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany

Beam profile measurements of high intensity electron beams below 10 MeV, e.g. in energy recovery linacs or magnetized high energy electron coolers, have to fulfill special demands. Commonly used diagnostic tools like synchrotron radiation and scintillation screens are ineffective or not able to withstand the beam power without being damaged. Non-invasive methods with comparable resolution are needed. Hence, a beam profile measurement system based on beam-induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components, especially in the injector and merger parts of an ERL. Since this measurement suffers from low count rates, special attention has to be given to the background. Beam profile measurements with the BIF system will be presented as well as a comparison with YAG screen measurements. The recent status of the TLS system will be presented.

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WEPG68

An Investigation into the Behaviour of Residual Gas Ionisation Profile Monitors in the ISIS Extracted Beamline

ion, simulation, synchrotron, proton

807

C.C. Wilcox, B. Jones, A. Pertica, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Non-destructive beam profile measurements at the ISIS neutron source are performed using Multi-Channel Profile Monitors (MCPMs). These use residual gas ionisation within the beam pipe, with the ions being guided to an array of 40 Channeltron electron multipliers by a high voltage drift field. Non-uniform transverse electric fields within these monitors are caused by the drift field and the beam's space charge. Longitudinally, a saddle point located between the drift field plate and the opposing compensating field plate introduces extra complexity into the ion motion. To allow for detailed studies of this behaviour, an MCPM has been placed in Extracted Proton Beamline 1 (EPB1) where the beam is well defined. Simulations of the profiles obtained by this monitor are performed using machine measurements, CST EM Studio and a simple C++ particle tracking code. This paper describes the process used to simulate MCPM profiles along with a comparison of simulated and measured results. Trajectories of detected ions from their creation to the Channeltrons are discussed, together with a study of Channeltron detection characteristics carried out in the ISIS diagnostics laboratory vacuum tank.

Poster WEPG68 [2.703 MB]

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WEPG69

Profile Measurement by the Ionization Profile Monitor with 0.2T Magnet System in J-PARC MR

electron, ion, injection, simulation

811

K. Satou, H. Kuboki, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

A nondestructive Ionization Profile Monitor (IPM) is widely used to measure transversal profile. At J-PARC Main Ring (MR), three IPM systems have been used not only to measure emittances but also to correct injection miss matchings. To measure injection 3GeV beam profiles, the high external E field of +50kV/130mm at the maximum is used to guide ionized positive ions to a position sensitive detector; transversal kick force originating from space charge E field of circulating beam is a main error source which deteriorates profile. The strong B field is also used to compensate the kick force. To measure 30GeV bunched beam at the flat top on the fast extraction mode in good resolution, the strong B field of about 0.2T is needed. One set of magnet system, which consists of a C-type and two H-type magnets, were developed and installed in one IPM system. The IPM chamber was inserted between the 2 poles of the C-type magnet. To make the line integral of B field along the beam axis zero, the H-type magnets have the opposite field polarity to that of the C-type magnet and were installed on both sides of the C-type magnet. Details of the magnet system and its first trials will be presented.

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WEPG73

A Hardware and Software Overview on the New BTF Transverse Profile Monitor

software, timing, linac, positron

818

B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
INFN/LNF, Frascati (Roma), Italy
P. Valente
INFN-Roma, Roma, Italy

Funding: Supported by the H2020 project AIDA-2020, GA no. 654168
In the last 11 years, the Beam-Test Facility (BTF) of the DAΦNE accelerator complex, in the Frascati laboratory, has gained an important role in the EU infrastructures devoted to the development of particle detectors. The facility can provide runtime tuneable electrons and positrons beams in a range of different parameters: energy (up to 750 MeV for e^- and 540 MeV for e+), charge ( up to 10¹⁰ e /bunch) and pulse length (1.4-40 ns). The bunch delivering rate is up to 49 Hz and the beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad, in order to achieve user needs. In these paper we are going to describe the new implementation of the secondary BTF beam transverse monitor systems based on WIDEPIX FITPIX detectors, operating in bus synchronization mode externally timed to BTF beams. Our software layout includes a data producer, a live-data display consumer and a MEMCACHED caching server. This configuration offers to BTF users a vary fast approach to the transverse data using TCP/IP calls to MEMCACHED with an easy and fast software integration on users DAQ. The data packing permits also to avoid the needs of mixed (user vs BTF) hardware synchronization.

Poster WEPG73 [3.267 MB]

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WEPG75

The Beam Profile Monitoring System for the CERN IRRAD Proton Facility

proton, data-acquisition, operation, radiation

825

F. Ravotti, B. Gkotse, M. Glaser, E. Matli, G. Pezzullo
CERN, Geneva, Switzerland
K.K. Gan, H. Kagan, S. Smith, J.D. Warner
Ohio State University, Columbus, Ohio, USA

Funding: Project funded by AIDA project and the EU H2020 Research and Innovation programme, GA n. 654168.
In High Energy Physics (HEP) experiments, devices are required to withstand high radiation levels. As a result, detectors and electronics sitting in the inner detector layers must be irradiated to determine their radiation tolerance. To perform these irradiations, CERN built during LS1 a new irradiation facility in the East Area at the Proton Synchrotron (PS) accelerator. At this facility, named IRRAD, a high-intensity 24 GeV/c proton beam is used. During beam steering and irradiation, the intensity and the transverse profile of the proton beam are monitored online. The IRRAD Beam Profile Monitor (BPM) uses a set of four 39-channel pixel detectors constructed using thin foil copper pads positioned on a flex circuit. When protons pass through the copper pads, they induce a measurable current. To measure this current a new data acquisition system was designed as well as a new database and on-line display system. In this work, we present the design and the architecture of the IRRAD BPM system, some results on its performance with the proton beam, as well as its planned upgrades, including its utilization for monitoring irradiations with an intense 300MeV/c positive pion beam at PSI.

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THBL01

SiPMs for Beam Instrumentation. Ideas From High Energy Physics

photon, radiation, electronics, instrumentation

860

D. Gascon, D. Ciaglia, G. Fernàndez, R. Graciani, S. Gómez, J. Mauricio, N. Rakotnavalona, A. Sanuy, D. Sánchez
UB, Barcelona, Spain

Silicon Photomultipliers (SiPM) enable fast low-level light detection and even photon counting with a semiconductor device. Thanks to a now matured technology, SiPMs can be used in a variety of applications like: Medical imaging, fluorescence detection, range-finding and high-energy physics. We present different possible application of SiPMs for beam instrumentation. First, we discuss timing properties of SiPMs, and how to optimize them for high rate environments enabling photon counting. This requires to understand the dependence of SiPM pulse shape on its configuration (total area, cell size, capacitances, etc) and analyse dedicated front end electronics techniques. Finally, based on the experience of several projects aiming to develop trackers for high energy physics, we present some ideas to develop beam monitoring instrumentation based scintillating fibers coupled to SiPMs, where radiation hardness of scintillating fibers can be an important concern.

Slides THBL01 [5.473 MB]

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