IBIC2016 - List of Keywords (photon)

Paper	Title	Other Keywords	Page
MOPG14	The Use of Single-crystal CVD Diamond as a Position Sensitive X-ray Detector	detector, synchrotron, 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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MOPG17	Performance Test of the Next Generation X-Ray Beam Position Monitor System for the APS Upgrade	undulator, operation, storage-ring, controls	78
	B.X. Yang, Y. Jaski, S.H. Lee, F. Lenkszus, M. Ramanathan, N. Sereno, F. Westferro 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 is developing its next major upgrade (APS-U) based on the multi-bend achromat lattice. Improved beam stability is critical for this upgrade and will require keeping short-time beam angle change below 0.25 μrad and long-term angle drift below 0.5 micro-radian. A reliable white x-ray beam diagnostic system in the front end is a key part of the planned beam stabilization system for the APS-U. This system includes an x-ray beam position monitor (XBPM) based on x-ray fluorescence (XRF) from two specially designed GlidCop A-15 absorbers, a second XBPM using XRF photons from the Exit Mask, and two white beam intensity monitors using XRF from the photon shutter and Compton-scattered photons from the front end beryllium window. We present orbit stability data for the first XBPM used in the feedback control during user operations, as well as test data from the second XBPM and the intensity monitors. The data demonstrated that the XBPM system meets the APS-U beam stability requirements.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG17
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MOPG36	Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector	detector, timing, simulation, radiation	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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MOPG52	Simulation of THz Streak Camera Performance for Femtosecond FEL Pulse Length Measurement	FEL, electron, simulation, laser	176
	I. Gorgisyan, R. Ischebeck, P.N. Juranič, E. Prat, S. Reiche PSI, Villigen PSI, Switzerland I. Gorgisyan EPFL, Lausanne, Switzerland
	Measurement of the temporal duration of FEL pulses is important both for the operators to monitor the performance of the machine and the users performing pump-probe measurements with FEL beam. The light-field streak camera is a promising methods for the photon pulse length measurement that uses the electric field of an IR/THz laser to streak the photoelectrons. This contribution presents a simulation of the performance of a streak camera using a single-cycle THz pulse. The simulation recreates the photoionization process and generates electron spectra in presence of the THz field and without it. Using these spectra the photon pulse lengths are calculated and compared to the initial values. Most of the parameters used in the simulation are chosen based on experiments performed earlier.** This contribution presents the simulation method and the obtained results. It validates the pulse length calculation analysis method and estimates the expected measurement accuracy and precision for the THz streak camera measurement technique. The simulations were done for different FEL pulse lengths ranging from about 1 fs to 40 fs both in soft and hard X-ray range. J. Itatani et al, PRL 88,2002 U. Fruhling et al, N. Phot. 3,2009 I. Gorgisyan et al, JSR 3,2016 P. N. Juranic et al, Opt. Exp. 22,2014 **P. N. Juranic et al, J. Inst. 9,2014
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG52
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MOPG59	Time Correlated Single Photon Counting Using Different Photon Detectors	operation, detector, 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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MOPG61	AXD Measurements at SOLEIL	dipole, electron, radiation, vacuum	209
	M. Labat, M. El Ajjouri, N. Hubert, D. Pédeau, M. Ribbens, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	A first prototype of in-Air X-ray Detector (AXD) has been installed on the SOLEIL storage ring. An AXD simply consists of a scintillator, an objective and a camera installed in air behind the absorber of the bending magnet's synchrotron radiation layer. The radiation vertical profile analysis easily enables to retrieve the vertical beam size of the electron beam at the source point. This simple diagnostics opens large perspectives of beam size measurement all around the ring for an accurate caracterization of the beam and improvment of its stability survey.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG61
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MOPG75	Single Shot Transversal Profile Monitoring of Ultra Low Charge Relativistic Electron Bunches at REGAE	electron, background, coupling, detector	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	detector, ion, 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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MOPG78	Scintillation and OTR Screen Characterization with a 440 GeV/c Proton Beam in Air at the CERN HiRadMat Facility	proton, vacuum, radiation, controls	268
	S. Burger, B. Biskup, S. Mazzoni, M. Turner CERN, Geneva, Switzerland B. Biskup Czech Technical University, Prague 6, Czech Republic M. Turner TUG/ITP, Graz, Austria
	Beam observation systems, based on charged particles passing through a light emitting screen, are widely used and often crucial for the operation of particle accelerators as well as experimental beamlines. The AWAKE experiment, currently under construction at CERN, requires a detailed understanding of screen sensitivity and the associated accuracy of the beam size measurement. We present the measurement of relative light yield and screen resolution of seven different materials (Chromox, YAG, Alumina, Titanium, Aluminium, Aluminium and Silver coated Silicon). The Chromox and YAG samples were additionally measured with different thicknesses. The measurements were performed at the CERN's HiRadMat test facility with 440 GeV/c protons, a beam similar to the one foreseen for AWAKE. The experiment was performed in an air environment.
	Poster MOPG78 [2.795 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG78
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TUAL02	A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity	neutron, detector, 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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TUPG06	Development Status of a Stable BPM System for the SPring-8 Upgrade	electronics, radiation, quadrupole, alignment	322
	H. Maesaka RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan H. Dewa, T. Fujita, M. Masaki, S. Takano JASRI, Hyogo, Japan
	A stable and precise BPM system is necessary for the low-emittance upgrade of SPring-8. Key requirements for the BPM system are: 1) long-term stability to maintain the photon beam direction of the beamline well within the intrinsic photon divergence, 2) single-pass resolution better than 100 μm rms for a 100 pC injected bunch for first turn steering in the beam commissioning, and 3) accuracy better than 100 μm rms with respect to aligned quadrupole and sextupole magnet centers to achieve the design performance of the upgraded ring. To realize the demanded stability, the BPM drift should be reduced to 1 μm level. Therefore, we have been pursuing designs to suppress the thermal deformation of a BPM head and its support and to minimize the drifts of BPM electronics and coaxial cables. The investigation results on causes of drifts of the present SPring-8 BPM system are reflected to the design of the new BPM system. A button-type BPM head has been developed, which can generate sufficient signal to satisfy the required single-pass resolution. We have also been studying the strategies of the alignment, position survey and electric center calibration of the BPM head better than 100 μm. M. Masaki et al., in this conference.
	Poster TUPG06 [5.250 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG06
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TUPG22	Timing Window and Optimization for Position Resolution and Energy Calibration of Scintillation Detector	detector, timing, simulation, radiation	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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TUPG33	Beam Diagnostics at Siam Photon Source	storage-ring, diagnostics, kicker, synchrotron	410
	P. Klysubun, S. Klinkhieo, S. Kongtawong, S. Krainara, T. Pulampong, P. Sudmuang, N. Suradet SLRI, Nakhon Ratchasima, Thailand
	In recent years the beam diagnostics and instrumenta-tion of Siam Photon Source (SPS), Thailand synchro-tron radiation facility, have been significantly improved for both the booster synchrotron and the 1.2 GeV stor-age ring. Additional diagnostics have been designed, fabricated, and installed, and the existing systems have been upgraded. This paper describes the current status of the beam diagnostics at SPS, as well as their respec-tive performances. These systems include beam posi-tion monitors (BPMs), a diagnostics beamline, beam loss monitors (BLMs), real-time tune measurement setups, and others. Apart from the instrument hardware, the acquisition electronics along with the processing software have been improved as well. The details of these upgrades are reported herewith.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG33
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TUPG66	High-Energy X-Ray Pinhole Camera for High-Resolution Electron Beam Size Measurements	detector, 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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TUPG73	Preparatory Work for a Fluorescence Based Profile Monitor for an Electron Lens	electron, proton, ion, radiation	528
	S. Udrea, P. Forck GSI, Darmstadt, Germany E. Barrios Diaz, O.R. Jones, P. Magagnin, G. Schneider, R. Veness CERN, Geneva, Switzerland P. Forck, S. Udrea IAP, Frankfurt am Main, Germany V. Tzoganis, C.P. Welsch, H.D. Zhang Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Electron lenses (e-lens) have been proposed and used to mitigate several issues related to beam dynamics in high current synchrotrons. A hollow electron lens system is presently under development as part of the collimation upgrade for the high luminosity up-grade of LHC. Moreover, at GSI an electron lens system also is proposed for space charge compensation in the SIS-18 synchrotron to decrease the tune spread and allow for the high intensities at the future FAIR facility. For effective operation, a very precise alignment is necessary between the ion beam and the low energy electron beam. For the e-lens at CERN a beam diagnostics setup based on an intersecting gas sheet and the observation of beam induced fluorescence (BIF) is under development within a collaboration between CERN, Cockcroft Institute and GSI. In this paper we give an account of recent preparatory experiments performed at the Cockcroft Institute's gas curtain experimental setup with the aim to find the optimum way of distinguishing between the signals due to the low energy electron beam and the relativistic proton beam.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG73
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TUPG76	Performance Studies of Industrial CCD Cameras Based on Signal-To-Noise and Photon Transfer Measurements	electron, diagnostics, detector, 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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TUPG80	Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT	alignment, proton, vacuum, controls	551
	C.A. Thomas, T. Galh, T.J. Grandsaert, H. Kocevar, J.H. Lee, A. Serrano, T.J. Shea ESS, Lund, Sweden
	We present in this paper the design and implementation of the Non-invasive Profile Monitors for the ESS LEBT. Non-invasive Profile Monitors at ESS measure the transverse profile of the high power proton beam. As such the NPM for the LEBT is not different from NPM designed for other sections of the ESS linac, however, it received the requirement to measure the position of the beam accurately with respect to the centre of the vacuum chamber, representing the reference orbit. This particular requirement led to implement a specific design to provide absolute position measurement to the system. In the following we will first describe the design and the associated functionalities, and then we will present the performance measurements of this built system, fully integrated into the control system. Finally we will discuss the performance in comparison to the initial requirements.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG80
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WEPG67	Non-Invasive Beam Profile Measurement for High Intensity Electron Beams	electron, laser, background, detector	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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WEPG77	Sub-fs Resolution with the Enhanced Operation of the X-band Transverse Deflecting Cavity using an RF pulse Compression SLED Cavity	cavity, klystron, electron, operation	833
	P. Krejcik, G.B. Bowden, S. Condamoor, Y. Ding, V.A. Dolgashev, J.P. Eichner, M.A. Franzi, A.A. Haase, J.R. Lewandowski, T.J. Maxwell, S.G. Tantawi, J.W. Wang, L. Xiao, C. Xu SLAC, Menlo Park, California, USA
	Funding: Work supported by DOE contract DE-AC03-76SF00515. The successful operation of the x-band transverse deflecting cavity (XTCAV) installed downstream of the LCLS undulator has been further enhanced by the recent addition of an RF pulse compression "SLED" cavity that doubles the temporal resolving power of this powerful diagnostic system for measurement of the longitudinal profile of both the electron bunch and the x-ray FEL pulse. RF pulse compression has allowed us to use the existing SLAC X-band klystron with nominal output power of 50 MW and extend the RF pulse length by a factor 4 to give us 4 times the peak power after compression. A new, innovative SLED cavity was designed and built at SLAC to operate efficiently at X-band. The elegant design uses a small spherical cavity combined with a polarizing mode coupler hybrid. We will report on the installation, commissioning and beam measurements demonstrating the sub-femtosecond resolution of the XTCAV system. J.W. Wang et al., "R&D of a Super-compact SLED System at SLAC", in Proc. 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 2016, paper MOOCA01, pp. 39-41.
	Poster WEPG77 [20.909 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG77
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THAL01	PALM Concepts and Considerations	electron, FEL, laser, free-electron-laser	848
	P.N. Juranič, R. Abela, I. Gorgisyan, C.P. Hauri, R. Ischebeck, B. Monoszlai, L. Patthey, C. Pradervand, M. Radović, L. Rivkin, V. Schlott, A.G. Stepanov PSI, Villigen PSI, Switzerland C.P. Hauri, L. Rivkin EPFL, Lausanne, Switzerland R. Ivanov, P. Peier DESY, Hamburg, Germany J. Liu XFEL. EU, Hamburg, Germany K. Ogawa, T. Togashi, M. Yabashi RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan S. Owada JASRI/RIKEN, Hyogo, Japan
	The Photon Arrival and Length Monitor (PALM), a THz streak camera device developed by PSI for non-destructive hard x-ray measurements of photon pulse length and arrival time versus a pump laser, was brought to the SACLA XFEL* in Japan in a cross-calibration temporal diagnostics campaign after an initial experiment where only the PALM was being used**. The device was used with 9 keV pink beam and a 9.0 and 8.8 keV two-color mode, successfully measuring the arrival time and pulse lengths for several different FEL operating conditions. The device has shown itself to be very robust and transparent to the FEL beam, with temporal characterization accuracies of 15 fs or better. SwissFEL will employ two such devices at the end stations for use by both operators and experimenters to improve the operation of the FEL and to better interpret experimental data. This report presents the PALM and its uses and capabilities, and discusses the results from the SACLA cross-calibration experiments. P. N. Juranic et. al, Journal of Instrumentation (2014) 9. T. Ishikawa et. al., Nature Photonics (2012) 6(8). * P. N. Juranic et. al., Optics Express (2014) 22.
	Slides THAL01 [85.575 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-THAL01
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THBL01	SiPMs for Beam Instrumentation. Ideas From High Energy Physics	detector, 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

Title

Other Keywords

Page

MOPG14

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

detector, synchrotron, 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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MOPG17

Performance Test of the Next Generation X-Ray Beam Position Monitor System for the APS Upgrade

undulator, operation, storage-ring, controls

78

B.X. Yang, Y. Jaski, S.H. Lee, F. Lenkszus, M. Ramanathan, N. Sereno, F. Westferro
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 is developing its next major upgrade (APS-U) based on the multi-bend achromat lattice. Improved beam stability is critical for this upgrade and will require keeping short-time beam angle change below 0.25 μrad and long-term angle drift below 0.5 micro-radian. A reliable white x-ray beam diagnostic system in the front end is a key part of the planned beam stabilization system for the APS-U. This system includes an x-ray beam position monitor (XBPM) based on x-ray fluorescence (XRF) from two specially designed GlidCop A-15 absorbers, a second XBPM using XRF photons from the Exit Mask, and two white beam intensity monitors using XRF from the photon shutter and Compton-scattered photons from the front end beryllium window. We present orbit stability data for the first XBPM used in the feedback control during user operations, as well as test data from the second XBPM and the intensity monitors. The data demonstrated that the XBPM system meets the APS-U beam stability requirements.

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MOPG36

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

detector, timing, simulation, radiation

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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MOPG52

Simulation of THz Streak Camera Performance for Femtosecond FEL Pulse Length Measurement

FEL, electron, simulation, laser

176

I. Gorgisyan, R. Ischebeck, P.N. Juranič, E. Prat, S. Reiche
PSI, Villigen PSI, Switzerland
I. Gorgisyan
EPFL, Lausanne, Switzerland

Measurement of the temporal duration of FEL pulses is important both for the operators to monitor the performance of the machine and the users performing pump-probe measurements with FEL beam. The light-field streak camera is a promising methods for the photon pulse length measurement that uses the electric field of an IR/THz laser to streak the photoelectrons*. This contribution presents a simulation of the performance of a streak camera using a single-cycle THz pulse**. The simulation recreates the photoionization process and generates electron spectra in presence of the THz field and without it. Using these spectra the photon pulse lengths are calculated and compared to the initial values. Most of the parameters used in the simulation are chosen based on experiments performed earlier.*** This contribution presents the simulation method and the obtained results. It validates the pulse length calculation analysis method and estimates the expected measurement accuracy and precision for the THz streak camera measurement technique. The simulations were done for different FEL pulse lengths ranging from about 1 fs to 40 fs both in soft and hard X-ray range.
*J. Itatani et al, PRL 88,2002
*U. Fruhling et al, N. Phot. 3,2009
**I. Gorgisyan et al, JSR 3,2016
***P. N. Juranic et al, Opt. Exp. 22,2014
***P. N. Juranic et al, J. Inst. 9,2014

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MOPG59

Time Correlated Single Photon Counting Using Different Photon Detectors

operation, detector, 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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MOPG61

AXD Measurements at SOLEIL

dipole, electron, radiation, vacuum

209

M. Labat, M. El Ajjouri, N. Hubert, D. Pédeau, M. Ribbens, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

A first prototype of in-Air X-ray Detector (AXD) has been installed on the SOLEIL storage ring. An AXD simply consists of a scintillator, an objective and a camera installed in air behind the absorber of the bending magnet's synchrotron radiation layer. The radiation vertical profile analysis easily enables to retrieve the vertical beam size of the electron beam at the source point. This simple diagnostics opens large perspectives of beam size measurement all around the ring for an accurate caracterization of the beam and improvment of its stability survey.

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MOPG75

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

electron, background, coupling, detector

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

detector, ion, 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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MOPG78

Scintillation and OTR Screen Characterization with a 440 GeV/c Proton Beam in Air at the CERN HiRadMat Facility

proton, vacuum, radiation, controls

268

S. Burger, B. Biskup, S. Mazzoni, M. Turner
CERN, Geneva, Switzerland
B. Biskup
Czech Technical University, Prague 6, Czech Republic
M. Turner
TUG/ITP, Graz, Austria

Beam observation systems, based on charged particles passing through a light emitting screen, are widely used and often crucial for the operation of particle accelerators as well as experimental beamlines. The AWAKE experiment, currently under construction at CERN, requires a detailed understanding of screen sensitivity and the associated accuracy of the beam size measurement. We present the measurement of relative light yield and screen resolution of seven different materials (Chromox, YAG, Alumina, Titanium, Aluminium, Aluminium and Silver coated Silicon). The Chromox and YAG samples were additionally measured with different thicknesses. The measurements were performed at the CERN's HiRadMat test facility with 440 GeV/c protons, a beam similar to the one foreseen for AWAKE. The experiment was performed in an air environment.

Poster MOPG78 [2.795 MB]

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TUAL02

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

neutron, detector, 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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TUPG06

Development Status of a Stable BPM System for the SPring-8 Upgrade

electronics, radiation, quadrupole, alignment

322

H. Maesaka
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
H. Dewa, T. Fujita, M. Masaki, S. Takano
JASRI, Hyogo, Japan

A stable and precise BPM system is necessary for the low-emittance upgrade of SPring-8. Key requirements for the BPM system are: 1) long-term stability to maintain the photon beam direction of the beamline well within the intrinsic photon divergence, 2) single-pass resolution better than 100 μm rms for a 100 pC injected bunch for first turn steering in the beam commissioning, and 3) accuracy better than 100 μm rms with respect to aligned quadrupole and sextupole magnet centers to achieve the design performance of the upgraded ring. To realize the demanded stability, the BPM drift should be reduced to 1 μm level. Therefore, we have been pursuing designs to suppress the thermal deformation of a BPM head and its support and to minimize the drifts of BPM electronics and coaxial cables. The investigation results on causes of drifts of the present SPring-8 BPM system are reflected to the design of the new BPM system. A button-type BPM head has been developed*, which can generate sufficient signal to satisfy the required single-pass resolution. We have also been studying the strategies of the alignment, position survey and electric center calibration of the BPM head better than 100 μm.
* M. Masaki et al., in this conference.

Poster TUPG06 [5.250 MB]

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TUPG22

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

detector, timing, simulation, radiation

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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TUPG33

Beam Diagnostics at Siam Photon Source

storage-ring, diagnostics, kicker, synchrotron

410

P. Klysubun, S. Klinkhieo, S. Kongtawong, S. Krainara, T. Pulampong, P. Sudmuang, N. Suradet
SLRI, Nakhon Ratchasima, Thailand

In recent years the beam diagnostics and instrumenta-tion of Siam Photon Source (SPS), Thailand synchro-tron radiation facility, have been significantly improved for both the booster synchrotron and the 1.2 GeV stor-age ring. Additional diagnostics have been designed, fabricated, and installed, and the existing systems have been upgraded. This paper describes the current status of the beam diagnostics at SPS, as well as their respec-tive performances. These systems include beam posi-tion monitors (BPMs), a diagnostics beamline, beam loss monitors (BLMs), real-time tune measurement setups, and others. Apart from the instrument hardware, the acquisition electronics along with the processing software have been improved as well. The details of these upgrades are reported herewith.

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TUPG66

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

detector, 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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TUPG73

Preparatory Work for a Fluorescence Based Profile Monitor for an Electron Lens

electron, proton, ion, radiation

528

S. Udrea, P. Forck
GSI, Darmstadt, Germany
E. Barrios Diaz, O.R. Jones, P. Magagnin, G. Schneider, R. Veness
CERN, Geneva, Switzerland
P. Forck, S. Udrea
IAP, Frankfurt am Main, Germany
V. Tzoganis, C.P. Welsch, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Electron lenses (e-lens) have been proposed and used to mitigate several issues related to beam dynamics in high current synchrotrons. A hollow electron lens system is presently under development as part of the collimation upgrade for the high luminosity up-grade of LHC. Moreover, at GSI an electron lens system also is proposed for space charge compensation in the SIS-18 synchrotron to decrease the tune spread and allow for the high intensities at the future FAIR facility. For effective operation, a very precise alignment is necessary between the ion beam and the low energy electron beam. For the e-lens at CERN a beam diagnostics setup based on an intersecting gas sheet and the observation of beam induced fluorescence (BIF) is under development within a collaboration between CERN, Cockcroft Institute and GSI. In this paper we give an account of recent preparatory experiments performed at the Cockcroft Institute's gas curtain experimental setup with the aim to find the optimum way of distinguishing between the signals due to the low energy electron beam and the relativistic proton beam.

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TUPG76

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

electron, diagnostics, detector, 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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TUPG80

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

alignment, proton, vacuum, controls

551

C.A. Thomas, T. Galh, T.J. Grandsaert, H. Kocevar, J.H. Lee, A. Serrano, T.J. Shea
ESS, Lund, Sweden

We present in this paper the design and implementation of the Non-invasive Profile Monitors for the ESS LEBT. Non-invasive Profile Monitors at ESS measure the transverse profile of the high power proton beam. As such the NPM for the LEBT is not different from NPM designed for other sections of the ESS linac, however, it received the requirement to measure the position of the beam accurately with respect to the centre of the vacuum chamber, representing the reference orbit. This particular requirement led to implement a specific design to provide absolute position measurement to the system. In the following we will first describe the design and the associated functionalities, and then we will present the performance measurements of this built system, fully integrated into the control system. Finally we will discuss the performance in comparison to the initial requirements.

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WEPG67

Non-Invasive Beam Profile Measurement for High Intensity Electron Beams

electron, laser, background, detector

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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WEPG77

Sub-fs Resolution with the Enhanced Operation of the X-band Transverse Deflecting Cavity using an RF pulse Compression SLED Cavity

cavity, klystron, electron, operation

833

P. Krejcik, G.B. Bowden, S. Condamoor, Y. Ding, V.A. Dolgashev, J.P. Eichner, M.A. Franzi, A.A. Haase, J.R. Lewandowski, T.J. Maxwell, S.G. Tantawi, J.W. Wang, L. Xiao, C. Xu
SLAC, Menlo Park, California, USA

Funding: Work supported by DOE contract DE-AC03-76SF00515.
The successful operation of the x-band transverse deflecting cavity (XTCAV) installed downstream of the LCLS undulator has been further enhanced by the recent addition of an RF pulse compression "SLED" cavity that doubles the temporal resolving power of this powerful diagnostic system for measurement of the longitudinal profile of both the electron bunch and the x-ray FEL pulse. RF pulse compression has allowed us to use the existing SLAC X-band klystron with nominal output power of 50 MW and extend the RF pulse length by a factor 4 to give us 4 times the peak power after compression. A new, innovative SLED cavity was designed and built at SLAC to operate efficiently at X-band*. The elegant design uses a small spherical cavity combined with a polarizing mode coupler hybrid. We will report on the installation, commissioning and beam measurements demonstrating the sub-femtosecond resolution of the XTCAV system.
*J.W. Wang et al., "R&D of a Super-compact SLED System at SLAC", in Proc. 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 2016, paper MOOCA01, pp. 39-41.

Poster WEPG77 [20.909 MB]

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THAL01

PALM Concepts and Considerations

electron, FEL, laser, free-electron-laser

848

P.N. Juranič, R. Abela, I. Gorgisyan, C.P. Hauri, R. Ischebeck, B. Monoszlai, L. Patthey, C. Pradervand, M. Radović, L. Rivkin, V. Schlott, A.G. Stepanov
PSI, Villigen PSI, Switzerland
C.P. Hauri, L. Rivkin
EPFL, Lausanne, Switzerland
R. Ivanov, P. Peier
DESY, Hamburg, Germany
J. Liu
XFEL. EU, Hamburg, Germany
K. Ogawa, T. Togashi, M. Yabashi
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
S. Owada
JASRI/RIKEN, Hyogo, Japan

The Photon Arrival and Length Monitor (PALM), a THz streak camera device developed by PSI for non-destructive hard x-ray measurements of photon pulse length and arrival time versus a pump laser*, was brought to the SACLA XFEL** in Japan in a cross-calibration temporal diagnostics campaign after an initial experiment where only the PALM was being used***. The device was used with 9 keV pink beam and a 9.0 and 8.8 keV two-color mode, successfully measuring the arrival time and pulse lengths for several different FEL operating conditions. The device has shown itself to be very robust and transparent to the FEL beam, with temporal characterization accuracies of 15 fs or better. SwissFEL will employ two such devices at the end stations for use by both operators and experimenters to improve the operation of the FEL and to better interpret experimental data. This report presents the PALM and its uses and capabilities, and discusses the results from the SACLA cross-calibration experiments.
* P. N. Juranic et. al, Journal of Instrumentation (2014) 9.
** T. Ishikawa et. al., Nature Photonics (2012) 6(8).
*** P. N. Juranic et. al., Optics Express (2014) 22.

Slides THAL01 [85.575 MB]

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THBL01

SiPMs for Beam Instrumentation. Ideas From High Energy Physics

detector, 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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