IBIC2019 - List of Keywords (synchrotron)

Paper	Title	Other Keywords	Page
MOCO03	Estimation of Longitudinal Profiles of Ion Bunches in the LHC Using Schottky-Based Diagnostics	distributed, experiment, diagnostics, hadron	45
	K. Łasocha, D. Alves CERN, Meyrin, Switzerland
	The Large Hadron Collider (LHC) Schottky monitors have been designed to measure various parameters of relevance to beam quality, namely tune, momentum spread and chromaticity. We present another application of this instrument - the evaluation of longitudinal bunch profiles. The relation between the distribution of synchrotron amplitudes within the bunch population and the longitudinal bunch profile is derived from probabilistic principles. Our approach, limited to bunched beams with no intra-bunch coherent motion, initially fits the cumulative power spectral density of acquired Schottky spectra with the underlying distribution of synchrotron amplitudes. The result of this fit is then used to reconstruct the bunch profile using the derived model. The results obtained are verified by a comparison with measurements from the LHC Wall Current Monitors.
	Slides MOCO03 [48.066 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOCO03
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP027	First Beam-based Test of Fast Closed Orbit Feedback System at GSI SIS18	controls, feedback, closed-orbit, acceleration	154
	R. Singh, A. Doring, P. Forck, K. Lang, S.H. Mirza, D. Rodomonti, D. Schupp, M. Schwickert, H. Welker GSI, Darmstadt, Germany A. Bardorfer I-Tech, Solkan, Slovenia
	Funding: European Unions Horizon 2020 Research and Innovation programme under Grant Agreement No. 730871 (ARIES). German Academic Exchange Service under Personal Reference No. 91605207. The SIS18 synchrotron of GSI will be used as a booster ring for the SIS100 synchrotron built in the scope of the FAIR project. In order to preserve the beam quality during the whole acceleration ramp, a new closed orbit feedback (COFB) system is implemented at the SIS18 which operates with the existing BPMs and steerer magnets. The system aims for a bandwidth of several 100 Hz and robustness against the variation of the response matrix and the beam rigidity during the ramp. The architecture of the system and the results of the first beam-based test of the COFB hardware are presented. As a first step, the orbit correction is performed over the entire ramp using the response matrix corresponding to injection energy only taking the beam rigidity into account. Experimental observations of the bandwidth limitations arising from the temporal delay of the steerer power supplies and the spatial model variation during the ramp are compared with simulations. It is found that the temporal and the spatial model mismatch have similar effect on the achievable bandwidth of the COFB.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP027
About •	paper received ※ 07 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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MOPP031	Optimisation of the ISIS Proton Synchrotron Experimental Damping System	damping, kicker, feedback, betatron	167
	A. Pertica, D.W. Posthuma de Boer, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J. Komppula CERN, Meyrin, Switzerland
	The ISIS Neutron and Muon Source, located in the UK, consists of a H⁻ linear accelerator, a rapid cycling proton synchrotron and two extraction lines delivering protons onto heavy metal targets. One of the limiting factors for achieving higher intensities in the accelerator is the head-tail instability present in the synchrotron, around 2ms after injection. In order to mitigate this instability, an experimental damping system is being developed for the ISIS synchrotron. Initial tests using a split electrode BPM as a pickup and a ferrite loaded kicker as a damper showed positive results. This paper describes the different developments made to the damping system and planned improvements to optimize its performance for use in normal operations.
	Poster MOPP031 [1.557 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP031
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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MOPP032	Fast Feedback Using Electron Beam Steering to Maintain the X-Ray Beam Position at a Monochromatic X-Ray Diagnostic at Diamond Light Source	feedback, electron, power-supply, controls	172
	C. Bloomer, G. Rehm, A. Tipper DLS, Oxfordshire, United Kingdom
	A new feedback system is being developed at Diamond Light Source, applying a modulation to the position of the electron beam to keep the synchrotron X-ray beam fixed at the sample-point. Beamline detectors operating in the 100-1000Hz regime are becoming common, and the X-ray beam stability demanded by beamlines is thus of comparable bandwidths. In this paper we present a feedback system operating at these bandwidths, using a diagnostic instrument permanently installed in the X-ray beam path to measure the error in beam position at the sample point, and fast air-cored magnets to apply a small modulation to the electron beam to compensate. Four magnets are used to generate electron beam bumps through an ID straight. This modulation of the beam away from the nominal orbit is small, less than 10 microns, but should be sufficient to compensate for the bulk of the X-ray motion observed at the sample. It is small enough that the impact on the machine will be negligible. This system aims to maintain X-ray beam stability to within 3% of a beam size, at bandwidths of up to 500Hz.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP032
About •	paper received ※ 09 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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MOPP045	MAX IV Operations - Diagnostic Tools and Lessons Learned	storage-ring, operation, status, injection	209
	B. Meirose, V. Abelin, B.E. Bolling, M. Brandin, R. Høier, A. Johansson, P. Lilja, J.S. Lundquist, S. Molloy, F. Persson, J.E. Petersson, R. Svärd MAX IV Laboratory, Lund University, Lund, Sweden
	In this contribution, I present some of the new beam diagnostic and monitoring tools developed by the MAX IV Operations Group. In particular, new BPM and accelerator tunes visualization tools and other simple but useful applications we have developed, such as our RF System Monitor, are presented. I also briefly share our experience with the development of audible alarms, which help operators monitor various parameters of the machine and explain how the implementation of all these tools have improved accelerator operations at MAX IV.
	Poster MOPP045 [2.879 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP045
About •	paper received ※ 04 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019
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TUPP026	Diagnostic Beamlines at the Solaris Storage Ring	diagnostics, storage-ring, emittance, electron	366
	A. Kisiel, S. Cabala, A.M. Marendziak, M. Ptaszkiewicz, A.I. Wawrzyniak, I.S. Zadworny, Z. Zbylut NSRC SOLARIS, Kraków, Poland
	Precise measurement and control of the particle beam emittance is a very important input to characterize the performance of any accelerator/SRS. Beam characterizations at the SOLARIS National Synchrotron Radiation Centre are provided by two independent diagnostic beamlines called the X-ray synchrotron radiation (PINHOLE) and optical synchrotron radiation (LUMOS) beamlines, respectively. The PINHOLE beamline depicts the electron beam by analyzing the emitted X-rays. However this method is predominantly applied to the middle and high energy storage rings. At Solaris storage ring with the nominal energy of 1.5 GeV and critical photon beam energy of c.a. 2 keV, the design of the beamline was modified to provide sufficient X-ray photon flux for proper imaging. Second diagnostic beamline LUMOS will be installed and commissioned in next few months. Issues discussed include the general design philosophy, choice of instrumentation, limits to resolution, and actual performance. *e-mail: adriana.wawrzyniak@uj.edu.pl
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP026
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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TUPP031	Electron Beam Size Measurements Using the Heterodyne Near Field Speckles at ALBA	radiation, experiment, undulator, synchrotron-radiation	383
	M. Siano, M.A.C. Potenza Universita’ degli Studi di Milano & INFN, Milano, Italy U. Iriso, C.S. Kamma-Lorger, A.A. Nosych ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain S. Mazzoni, G. Trad CERN, Geneva, Switzerland B. Paroli Universita’ degli Studi di Milano, Milano, Italy
	Experiments using the heterodyne near field speckle method (HNFS) have been performed at ALBA to characterize the spatial coherence of the synchrotron radiation, with the ultimate goal of measuring both the horizontal and vertical electron beam sizes. The HNFS technique consists on the analysis of the interference between the radiation scattered by a colloidal suspension of nanoparticles and the synchrotron radiation, which in this case corresponds to the hard x-rays (12keV) produced by the in-vacuum undulator of the NCD-Sweet beamline. This paper describes the fundamentals of the technique, possible limitations, and shows the first experimental results changing the beam coupling of the storage ring.
	Poster TUPP031 [2.093 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP031
About •	paper received ※ 06 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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TUPP037	Studies of the Time Structure of Ionisation Beam Profile Measurements in the ISIS Extracted Proton Beamline	simulation, space-charge, proton, electron	412
	C.C. Wilcox, W.A. Frank, A. Pertica, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Ionisation Profile Monitors (IPMs) are used at the ISIS neutron and muon source to perform non-destructive transverse beam profile measurements. An in-house particle tracking code, combined with 3D CST modelling of the electric fields within the monitors, has been used to improve understanding of the various error sources within the IPMs, and shows close agreement with profile measurements in the synchrotron. To allow for detailed benchmarking studies, an IPM has been installed in Extracted Proton Beamline 1 (EPB1), enabling comparison with secondary emission (SEM) grid measurements. However, the IPM measurements taken in EPB1 show increased levels of profile broadening at operational beam intensities, which are not reproduced by SEM measurements or simulation. To investigate these differences, studies of the time structure of measured profiles are being performed. This paper details the development of new, high-speed multichannel data acquisition electronics, required to perform these studies. Resulting measurements are discussed, along with an analysis of the data¿s time structure and a comparison with that predicted by the IPM code.
	Poster TUPP037 [1.102 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP037
About •	paper received ※ 04 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019
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TUPP038	Spatial Resolution of an X-ray Pinhole Camera using a Multi-layer Monochromator	photon, emittance, simulation, feedback	417
	L. Bobb, G. Rehm DLS, Oxfordshire, United Kingdom
	X-ray pinhole cameras are widely used for beam emittance monitoring at synchrotron light sources. Due to the reduction in beam emittance expected for the many fourth generation machine upgrades, the spatial resolution of the pinhole camera must be improved accordingly. It is well known that there are many contributions to the point spread function. However, a significant contribution arises from diffraction by the pinhole aperture. Given that diffraction is dependent on the spectral distribution of the incident synchrotron radiation, the spatial resolution can be improved by using a monochromatic beam. For optimal performance, the photon energy should be matched to the pinhole aperture size. Here we investigate the spatial resolution of the pinhole camera as a function of photon energy using a multi-layer monochromator.
	Poster TUPP038 [0.617 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP038
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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TUPP039	Horizontal and Vertical Emittance Measurements of the Advanced Photon Source Booster Synchrotron Beam at High Charge	emittance, quadrupole, electron, booster	420
	K.P. Wootton, W. Berg, J.R. Calvey, K.C. Harkay, A.H. Lumpkin, A. Xiao, B.X. Yang, C. Yao ANL, Lemont, Illinois, USA
	Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. In order to maximise the injection efficiency from the booster synchrotron into the proposed Advanced Photon Source Upgrade storage ring, beam-based optimisation of the booster electron optical lattice is anticipated. In the present work, we present non-destructive beam size and emittance measurements using the booster synchrotron light monitor and destructive quadrupole scan emittance measurements in the booster to storage ring transport line. Destructive measurements are performed with a 0.1 mm thickness Cerium-doped Yttrium Aluminium Garnet screen. In order to characterise performance, both the beam energy at extraction (5, 6 and 7 GeV) and the bunch charge are varied.
	Poster TUPP039 [0.973 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP039
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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TUPP044	Multiple Synchrotron Light Monitors for Transverse Matching and Monitoring at CEBAF	emittance, quadrupole, alignment, monitoring	439
	B.G. Freeman, J. Gubeli, M.G. Tiefenback JLab, Newport News, Virginia, USA
	Funding: DOE Contract No. DE-AC05-06OR23177 Beam setup at the Continuous Electron Beam Accelerator Facility (CEBAF) involves threading beam through the machine, monitoring global transfer functions to identify and address cumulative lattice errors. Transverse beam emittance may grow by as much as two orders of magnitude, mediated by synchrotron radiation. Re-matching the enlarged beam phase space into successive re-circulation arcs minimizes this emittance growth but requires knowledge of the actual beam distribution. This is now accomplished through quadrupole scans using wire profile monitors, the most time-consuming activity in our setup process. We propose to use Synchrotron Light Monitors (SLMs) to image the beam at homologous points in the four super-period recirculation arc lattices. Benefits include real-time monitoring of beam parameters and reduced elapsed time for initial setup. These SLMs will be installed in Arc 7 of the CEBAF machine, where Synchrotron Radiation contributes moderately to emittance growth. One of four required SLMs will be installed and commissioned this year, with the rest being installed next year.
	Poster TUPP044 [0.170 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP044
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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WECO01	Characterisation of Closed Orbit Feedback Systems	controls, feedback, electron, hadron	479
	G. Rehm DLS, Oxfordshire, United Kingdom
	Closed orbit feedback is applied at nearly all synchrotrons. Detailed investigations continue to be performed on the mathematical modelling of the spatial part (i.e. related to Orbit Response Matrix) and the dynamic part (i.e. the controller). This talk will serve as a summary of the ARIES workshop on closed orbit feedback organized by ALBA in November 2018. Benefits of recent advances compared to the traditional implementations will be highlighted.
	Slides WECO01 [4.912 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO01
About •	paper received ※ 06 September 2019 paper accepted ※ 20 November 2019 issue date ※ 10 November 2019
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WECO03	Tune Computation via Model Fitting to Swept Machine Response Measurement	feedback, operation, resonance, betatron	490
	M.G. Abbott, G. Rehm DLS, Oxfordshire, United Kingdom
	At Diamond Light Source we compute the horizontal and vertical tunes by fitting a simple multi-pole resonator model to the measured electron beam frequency response. The transverse (and longitudinal) tune response is measured by sweeping an excitation across the range of possible tune frequencies and synchronously measuring the IQ response. The multi-pole resonator model is a good fit to the measured behaviour, but the fitting process is surprisingly challenging. Problems include noisy measurements, very complex beam responses in the presence of increasing chromaticity, poor data when the beam is close to instability, and a number of challenges with the stability of the algorithm. The tune fitting algorithm now in use at Diamond has been developed and refined over many years. It is finally stable enough to work reliably throughout most beam operating conditions. The algorithm involves alternating peak finding and non-linear fitting, with a fairly naive mathematical approach; the main focus is on providing reliable results.
	Slides WECO03 [1.059 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO03
About •	paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019
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WEPP016	Real-Time Synchronized Calibration and Computing System with EPICS Based Distributed Controls in the TPS XBPM System	controls, EPICS, photon, distributed	548
	J.-Y. Chuang, C.K. Chan, C.-C. Chang, C.M. Cheng, Y.T. Cheng, Y.M. Hsiao, Y.Z. Lin, Y.-C. Liu, C. Shueh, Y.C. Yang NSRRC, Hsinchu, Taiwan
	In synchrotron facilities, X-ray beam position monitor (XBPM) is an important detector for photon beam position monitoring and must be calibrated to ensure reliability and precision. However, light source operating conditions, such as beam orbit, injection and insertion device parameters, etc., can influence the sensitivity and specific weighting of photoemission current from the XBPM diamond blades. In the Taiwan Photon Source (TPS), Experimental Physics and Industrial Control System (EPICS) was utilized to implant an automatic calibration process. By using EPICS, we can ensure a seamless integration between the different front ends (FEs) and direct all data stream into a centralized server, creating a distributed XBPM calibration system. The XBPM performance indicators are analyzed to evaluate the validity of calibration parameters by input/ output controller (IOC) in each FE computing system. This paper will discuss the benefits of implanting this distributed control system into a working environment such as the TPS. XBPM, TPS, Front end, Distributed XBPM calibration system
	Poster WEPP016 [0.843 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP016
About •	paper received ※ 01 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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WEPP021	Machine Learning Image Processing Technology Application in Bunch Longitudinal Phase Data Information Extraction	network, damping, injection, SRF	568
	X.Y. Xu, Y.M. Zhou SINAP, Shanghai, People’s Republic of China Y.B. Leng, Y.M. Zhou SSRF, Shanghai, People’s Republic of China X.Y. Xu University of Chinese Academy of Sciences, Beijing, People’s Republic of China
	To achieve the bunch-by-bunch longitudinal phase measurement, Shanghai Synchrotron Radiation Facility (SSRF) has developed a high resolution measurement system. We used this measurement system to study the injection transient process, and obtained the longitudinal phase of the refilled bunch and the longitudinal phase of the original stored bunch. A large number of parameters of the synchronous damping oscillation are included in this large amount of longitudinal phase data, which are important for the evaluation of machine state and bunch stability. The multi-turn phase data of a multi-bunch is a large two-dimensional array that can be converted into an image. The convolutional neural network (CNN) is a machine learning model with strong capabilities in image processing. We hope to use the convolutional neural network to process the longitudinal phase two-dimensional array data, and extract important parameters such as the oscillation amplitude and the synchrotron damping time.
	Poster WEPP021 [1.292 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP021
About •	paper received ※ 23 August 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019
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WEPP038	Observation of Microbunching Instabilities using THz Detector at NSLS-II	detector, radiation, synchrotron-radiation, dipole	629
	W.X. Cheng ANL, Lemont, Illinois, USA B. Bacha, G.L. Carr BNL, Upton, New York, USA
	Microbunching instabilities have been observed in several light sources with high single bunch current stored. The instability is typically associated with threshold beam currents. Energy spread and bunch length are increasing above the thresholds. Recently, a terahertz (THz) detector was installed at the cell 22 infrared (IR) beamline at NSLS-II storage ring to study the micro-bunch instabilities. The IR beamline has wide aperture allowing long-wavelength synchrotron radiation or microwave signal propagate to the end station, where the detector was installed. The detector output signal has been analyzed using oscilloscope, spectrum analyzer and FFT real-time spectrum analyzer. Clear sidebands appear as single bunch current increases and the sidebands tend to shift/jump. We present measurement results of the THz detector at different nominal bunch lengths and ID gaps.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP038
About •	paper received ※ 04 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019
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THAO02	Towards Full Silicon 4H-SiC Based X-Ray Beam Monitoring	feedback, storage-ring, experiment, monitoring	665
	M. Camarda, M. Birri, M. Carulla, D. Grolimund, B. Meyer, C. Pradervand PSI, Villigen PSI, Switzerland U. Grossner, S.M. Nida, A. Tsibizov, T. Ziemann ETH, Zurich, Switzerland
	In this work, we present extensive theoretical and experimental results of novel Silicon Carbide x-ray sensors for beam position monitoring (XBPM). Until recently, diamond, was considered the material-of-choice for continuous monitoring of hard (>6keV) x-ray beams at synchrotron light sources. Diamond XBPM are now commercially available as single crystal* and polycrystalline sensors. However, in a recently published paper, we have shown that Silicon Carbide is superior to both diamond crystal types in several critical aspects. Specifically, we found superior electrical characteristics (sensor dynamics, signal uniformity, signal strength) and superior optical properties (full device transparency, device active area, signal strength) when compared to commercial polycrystalline and single crystal diamond, respectively. We also succeeded in the ¿industrialization¿ of the SiC fabrication process, allowing for the simultaneous realization of several (>40) sensors in up to 4¿ SiC wafers, with high yields. More recently we have also analyzed the fluorescence of SiC sensors as compared to YAG ones, finding that SiC can also be used for hybrid position/shape monitoring schema. CIVIDEC. AT, SYDORTECHNOLOGIES. COM DECTRIS. COM * S. Nida, et. al. Silicon carbide X-ray beam position monitors for synchrotron applications J. Synchrotron Rad. 26, 28-35 (2019)
	Slides THAO02 [9.963 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO02
About •	paper received ※ 11 September 2019 paper accepted ※ 11 September 2019 issue date ※ 10 November 2019
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Paper

Title

Other Keywords

Page

MOCO03

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

distributed, experiment, diagnostics, hadron

45

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

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

Slides MOCO03 [48.066 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOCO03

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

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MOPP027

First Beam-based Test of Fast Closed Orbit Feedback System at GSI SIS18

controls, feedback, closed-orbit, acceleration

154

R. Singh, A. Doring, P. Forck, K. Lang, S.H. Mirza, D. Rodomonti, D. Schupp, M. Schwickert, H. Welker
GSI, Darmstadt, Germany
A. Bardorfer
I-Tech, Solkan, Slovenia

Funding: European Unions Horizon 2020 Research and Innovation programme under Grant Agreement No. 730871 (ARIES). German Academic Exchange Service under Personal Reference No. 91605207.
The SIS18 synchrotron of GSI will be used as a booster ring for the SIS100 synchrotron built in the scope of the FAIR project. In order to preserve the beam quality during the whole acceleration ramp, a new closed orbit feedback (COFB) system is implemented at the SIS18 which operates with the existing BPMs and steerer magnets. The system aims for a bandwidth of several 100 Hz and robustness against the variation of the response matrix and the beam rigidity during the ramp. The architecture of the system and the results of the first beam-based test of the COFB hardware are presented. As a first step, the orbit correction is performed over the entire ramp using the response matrix corresponding to injection energy only taking the beam rigidity into account. Experimental observations of the bandwidth limitations arising from the temporal delay of the steerer power supplies and the spatial model variation during the ramp are compared with simulations. It is found that the temporal and the spatial model mismatch have similar effect on the achievable bandwidth of the COFB.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP027

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paper received ※ 07 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

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MOPP031

Optimisation of the ISIS Proton Synchrotron Experimental Damping System

damping, kicker, feedback, betatron

167

A. Pertica, D.W. Posthuma de Boer, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J. Komppula
CERN, Meyrin, Switzerland

The ISIS Neutron and Muon Source, located in the UK, consists of a H⁻ linear accelerator, a rapid cycling proton synchrotron and two extraction lines delivering protons onto heavy metal targets. One of the limiting factors for achieving higher intensities in the accelerator is the head-tail instability present in the synchrotron, around 2ms after injection. In order to mitigate this instability, an experimental damping system is being developed for the ISIS synchrotron. Initial tests using a split electrode BPM as a pickup and a ferrite loaded kicker as a damper showed positive results. This paper describes the different developments made to the damping system and planned improvements to optimize its performance for use in normal operations.

Poster MOPP031 [1.557 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP031

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

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MOPP032

Fast Feedback Using Electron Beam Steering to Maintain the X-Ray Beam Position at a Monochromatic X-Ray Diagnostic at Diamond Light Source

feedback, electron, power-supply, controls

172

C. Bloomer, G. Rehm, A. Tipper
DLS, Oxfordshire, United Kingdom

A new feedback system is being developed at Diamond Light Source, applying a modulation to the position of the electron beam to keep the synchrotron X-ray beam fixed at the sample-point. Beamline detectors operating in the 100-1000Hz regime are becoming common, and the X-ray beam stability demanded by beamlines is thus of comparable bandwidths. In this paper we present a feedback system operating at these bandwidths, using a diagnostic instrument permanently installed in the X-ray beam path to measure the error in beam position at the sample point, and fast air-cored magnets to apply a small modulation to the electron beam to compensate. Four magnets are used to generate electron beam bumps through an ID straight. This modulation of the beam away from the nominal orbit is small, less than 10 microns, but should be sufficient to compensate for the bulk of the X-ray motion observed at the sample. It is small enough that the impact on the machine will be negligible. This system aims to maintain X-ray beam stability to within 3% of a beam size, at bandwidths of up to 500Hz.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP032

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

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MOPP045

MAX IV Operations - Diagnostic Tools and Lessons Learned

storage-ring, operation, status, injection

209

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

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

Poster MOPP045 [2.879 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP045

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

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TUPP026

Diagnostic Beamlines at the Solaris Storage Ring

diagnostics, storage-ring, emittance, electron

366

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

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

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP026

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

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TUPP031

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

radiation, experiment, undulator, synchrotron-radiation

383

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

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

Poster TUPP031 [2.093 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP031

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paper received ※ 06 September 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

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TUPP037

Studies of the Time Structure of Ionisation Beam Profile Measurements in the ISIS Extracted Proton Beamline

simulation, space-charge, proton, electron

412

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

Ionisation Profile Monitors (IPMs) are used at the ISIS neutron and muon source to perform non-destructive transverse beam profile measurements. An in-house particle tracking code, combined with 3D CST modelling of the electric fields within the monitors, has been used to improve understanding of the various error sources within the IPMs, and shows close agreement with profile measurements in the synchrotron. To allow for detailed benchmarking studies, an IPM has been installed in Extracted Proton Beamline 1 (EPB1), enabling comparison with secondary emission (SEM) grid measurements. However, the IPM measurements taken in EPB1 show increased levels of profile broadening at operational beam intensities, which are not reproduced by SEM measurements or simulation. To investigate these differences, studies of the time structure of measured profiles are being performed. This paper details the development of new, high-speed multichannel data acquisition electronics, required to perform these studies. Resulting measurements are discussed, along with an analysis of the data¿s time structure and a comparison with that predicted by the IPM code.

Poster TUPP037 [1.102 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP037

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

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TUPP038

Spatial Resolution of an X-ray Pinhole Camera using a Multi-layer Monochromator

photon, emittance, simulation, feedback

417

L. Bobb, G. Rehm
DLS, Oxfordshire, United Kingdom

X-ray pinhole cameras are widely used for beam emittance monitoring at synchrotron light sources. Due to the reduction in beam emittance expected for the many fourth generation machine upgrades, the spatial resolution of the pinhole camera must be improved accordingly. It is well known that there are many contributions to the point spread function. However, a significant contribution arises from diffraction by the pinhole aperture. Given that diffraction is dependent on the spectral distribution of the incident synchrotron radiation, the spatial resolution can be improved by using a monochromatic beam. For optimal performance, the photon energy should be matched to the pinhole aperture size. Here we investigate the spatial resolution of the pinhole camera as a function of photon energy using a multi-layer monochromator.

Poster TUPP038 [0.617 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP038

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

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TUPP039

Horizontal and Vertical Emittance Measurements of the Advanced Photon Source Booster Synchrotron Beam at High Charge

emittance, quadrupole, electron, booster

420

K.P. Wootton, W. Berg, J.R. Calvey, K.C. Harkay, A.H. Lumpkin, A. Xiao, B.X. Yang, C. Yao
ANL, Lemont, Illinois, USA

Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
In order to maximise the injection efficiency from the booster synchrotron into the proposed Advanced Photon Source Upgrade storage ring, beam-based optimisation of the booster electron optical lattice is anticipated. In the present work, we present non-destructive beam size and emittance measurements using the booster synchrotron light monitor and destructive quadrupole scan emittance measurements in the booster to storage ring transport line. Destructive measurements are performed with a 0.1 mm thickness Cerium-doped Yttrium Aluminium Garnet screen. In order to characterise performance, both the beam energy at extraction (5, 6 and 7 GeV) and the bunch charge are varied.

Poster TUPP039 [0.973 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP039

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

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TUPP044

Multiple Synchrotron Light Monitors for Transverse Matching and Monitoring at CEBAF

emittance, quadrupole, alignment, monitoring

439

B.G. Freeman, J. Gubeli, M.G. Tiefenback
JLab, Newport News, Virginia, USA

Funding: DOE Contract No. DE-AC05-06OR23177
Beam setup at the Continuous Electron Beam Accelerator Facility (CEBAF) involves threading beam through the machine, monitoring global transfer functions to identify and address cumulative lattice errors. Transverse beam emittance may grow by as much as two orders of magnitude, mediated by synchrotron radiation. Re-matching the enlarged beam phase space into successive re-circulation arcs minimizes this emittance growth but requires knowledge of the actual beam distribution. This is now accomplished through quadrupole scans using wire profile monitors, the most time-consuming activity in our setup process. We propose to use Synchrotron Light Monitors (SLMs) to image the beam at homologous points in the four super-period recirculation arc lattices. Benefits include real-time monitoring of beam parameters and reduced elapsed time for initial setup. These SLMs will be installed in Arc 7 of the CEBAF machine, where Synchrotron Radiation contributes moderately to emittance growth. One of four required SLMs will be installed and commissioned this year, with the rest being installed next year.

Poster TUPP044 [0.170 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP044

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

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WECO01

Characterisation of Closed Orbit Feedback Systems

controls, feedback, electron, hadron

479

G. Rehm
DLS, Oxfordshire, United Kingdom

Closed orbit feedback is applied at nearly all synchrotrons. Detailed investigations continue to be performed on the mathematical modelling of the spatial part (i.e. related to Orbit Response Matrix) and the dynamic part (i.e. the controller). This talk will serve as a summary of the ARIES workshop on closed orbit feedback organized by ALBA in November 2018. Benefits of recent advances compared to the traditional implementations will be highlighted.

Slides WECO01 [4.912 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WECO01

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paper received ※ 06 September 2019 paper accepted ※ 20 November 2019 issue date ※ 10 November 2019

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WECO03

Tune Computation via Model Fitting to Swept Machine Response Measurement

feedback, operation, resonance, betatron

490

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

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

Slides WECO03 [1.059 MB]

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

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

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WEPP016

Real-Time Synchronized Calibration and Computing System with EPICS Based Distributed Controls in the TPS XBPM System

controls, EPICS, photon, distributed

548

J.-Y. Chuang, C.K. Chan, C.-C. Chang, C.M. Cheng, Y.T. Cheng, Y.M. Hsiao, Y.Z. Lin, Y.-C. Liu, C. Shueh, Y.C. Yang
NSRRC, Hsinchu, Taiwan

In synchrotron facilities, X-ray beam position monitor (XBPM) is an important detector for photon beam position monitoring and must be calibrated to ensure reliability and precision. However, light source operating conditions, such as beam orbit, injection and insertion device parameters, etc., can influence the sensitivity and specific weighting of photoemission current from the XBPM diamond blades. In the Taiwan Photon Source (TPS), Experimental Physics and Industrial Control System (EPICS) was utilized to implant an automatic calibration process. By using EPICS, we can ensure a seamless integration between the different front ends (FEs) and direct all data stream into a centralized server, creating a distributed XBPM calibration system. The XBPM performance indicators are analyzed to evaluate the validity of calibration parameters by input/ output controller (IOC) in each FE computing system. This paper will discuss the benefits of implanting this distributed control system into a working environment such as the TPS.
XBPM, TPS, Front end, Distributed XBPM calibration system

Poster WEPP016 [0.843 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP016

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paper received ※ 01 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019

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WEPP021

Machine Learning Image Processing Technology Application in Bunch Longitudinal Phase Data Information Extraction

network, damping, injection, SRF

568

X.Y. Xu, Y.M. Zhou
SINAP, Shanghai, People’s Republic of China
Y.B. Leng, Y.M. Zhou
SSRF, Shanghai, People’s Republic of China
X.Y. Xu
University of Chinese Academy of Sciences, Beijing, People’s Republic of China

To achieve the bunch-by-bunch longitudinal phase measurement, Shanghai Synchrotron Radiation Facility (SSRF) has developed a high resolution measurement system. We used this measurement system to study the injection transient process, and obtained the longitudinal phase of the refilled bunch and the longitudinal phase of the original stored bunch. A large number of parameters of the synchronous damping oscillation are included in this large amount of longitudinal phase data, which are important for the evaluation of machine state and bunch stability. The multi-turn phase data of a multi-bunch is a large two-dimensional array that can be converted into an image. The convolutional neural network (CNN) is a machine learning model with strong capabilities in image processing. We hope to use the convolutional neural network to process the longitudinal phase two-dimensional array data, and extract important parameters such as the oscillation amplitude and the synchrotron damping time.

Poster WEPP021 [1.292 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP021

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paper received ※ 23 August 2019 paper accepted ※ 10 September 2019 issue date ※ 10 November 2019

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WEPP038

Observation of Microbunching Instabilities using THz Detector at NSLS-II

detector, radiation, synchrotron-radiation, dipole

629

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

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

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP038

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

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THAO02

Towards Full Silicon 4H-SiC Based X-Ray Beam Monitoring

feedback, storage-ring, experiment, monitoring

665

M. Camarda, M. Birri, M. Carulla, D. Grolimund, B. Meyer, C. Pradervand
PSI, Villigen PSI, Switzerland
U. Grossner, S.M. Nida, A. Tsibizov, T. Ziemann
ETH, Zurich, Switzerland

In this work, we present extensive theoretical and experimental results of novel Silicon Carbide x-ray sensors for beam position monitoring (XBPM). Until recently, diamond, was considered the material-of-choice for continuous monitoring of hard (>6keV) x-ray beams at synchrotron light sources. Diamond XBPM are now commercially available as single crystal* and polycrystalline** sensors. However, in a recently published paper***, we have shown that Silicon Carbide is superior to both diamond crystal types in several critical aspects. Specifically, we found superior electrical characteristics (sensor dynamics, signal uniformity, signal strength) and superior optical properties (full device transparency, device active area, signal strength) when compared to commercial polycrystalline and single crystal diamond, respectively. We also succeeded in the ¿industrialization¿ of the SiC fabrication process, allowing for the simultaneous realization of several (>40) sensors in up to 4¿ SiC wafers, with high yields. More recently we have also analyzed the fluorescence of SiC sensors as compared to YAG ones, finding that SiC can also be used for hybrid position/shape monitoring schema.
* CIVIDEC. AT, SYDORTECHNOLOGIES. COM
** DECTRIS. COM
*** S. Nida, et. al. Silicon carbide X-ray beam position monitors for synchrotron applications J. Synchrotron Rad. 26, 28-35 (2019)

Slides THAO02 [9.963 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-THAO02

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

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