IPAC2014 - List of Keywords (timing)

Paper	Title	Other Keywords	Page
MOPRO082	Suppression of Stored Beam Oscillation at Injection by Fast Kicker in the SPring-8 Storage Ring	kicker, injection, storage-ring, operation	280
	C. Mitsuda, K. Fukami, K. Kobayashi, M. Masaki, H. Ohkuma, S. Sasaki, K. Soutome JASRI/SPring-8, Hyogo-ken, Japan T. Nakanishi SES, Hyogo-pref., Japan
	When the injection bump orbit is not closed perfectly at the beam injection, the horizontal stored beam oscillation is excited. In the SPring-8 storage ring, many efforts had been paid to reduce the beam oscillation by adjusting the temporal shape and timing of four bump magnets and by applying a counter kick to the residual oscillation, whose amplitude is as large as 0.4mm and the width is as narrow as 500ns. Now, the averaged oscillation amplitude has successfully been suppressed to the level of less than 0.1mm. To confirm the suppression effect, we observed the turn-by-turn photon beam profile at the diagnostics beamline with the insertion device. We confirmed that the light axis oscillation was significantly suppressed by a factor of 5 comparing by applying a counter kick. We also found that the oscillation shape and the oscillation amplitude, which were caused by the timing shift of firing bump magnets, are drastically changed by only timing shift of one magnet. We are considering the feedback scheme to keep the suppression effect at the initial level during the user-time.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO082
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MOPME069	Upgrade of the Injection Kicker System for J-PARC Main Ring	injection, kicker, feedback, operation	526
	T. Sugimoto, K. Fan, K. Ishii, H. Matsumoto KEK, Ibaraki, Japan
	Four lumped inductance injection kicker magnets for the J-PARC main ring (MR) produce a kick of 0.1096 T·m with a 1% to 99% rise-time of about 400 nsec. A residual field of about 6% of the flat-top exists at the tail of the pulse due to an impedance mismatching. The residual field is required to be suppressed less than 1% to reduce injection losses. For a higher intensity beam operation, the kicker rise-time of less than 300nsec is required to inject longer beam bunches which reduces a space charge effect. During the long shutdown in FY2013, 140Ω resistor and 7nF capacitor were connected to the thyratron to improve the post-pulse shape. In addition, an optimization of a capacitance in the matching circuit was carried out to optimize the waveform. As the result, the rise-time of 195nsec and the residual tail field of 2% were achieved. However, another reflection peak of about 9% is appeared. We plan to compensate the effect of the new peak by using a new small kicker magnet. This paper discusses the detail of the circuit and the beam test results.
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TUPRO038	Beam Positioning Concept and Tolerance Considerations for BERLinPro	laser, emittance, linac, gun	1105
	B.C. Kuske, J. Rudolph HZB, Berlin, Germany
	Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin, and grants of Helmholtz Association BERLinPro is an ERL project at Helmholtz-Zentrum Berlin, with the goal to illuminate the challenges and promises of a high brightness 100 mA superconducting RF gun in combination with a 50 MeV return loop and energy recovery [1, 2]. The precision of the beam position in a single turn machine might be relaxed compared to the demands in storage rings. Still, a trajectory correction concept has to be developed and the influence of trajectory offsets on the goal parameters, its dependence on fluctuating injection parameters or effects related to the low energy of 6.5-50 MeV have to be investigated. This paper covers the initial trajectory correction studies and first tolerance scenarios of BERLinPro using the projected hardware concept.
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TUPRI107	Compact MTCA.4 Based Laser Synchronization	laser, FPGA, hardware, FEL	1823
	M. Felber, L. Butkowski, H.T. Duhme, M. Fenner, C. Gerth, U. Mavrič, P. Peier, H. Schlarb, B. Steffen DESY, Hamburg, Germany T. Kozak, P. Prędki, K.P. Przygoda TUL-DMCS, Łódź, Poland
	In this paper we present a compact and efficient approach for laser synchronization based on MTCA.4 platform. Laser pulses are converted to the RF signals using a photo-diode detector. The RF section performs filtering, amplification and down-conversion of a narrowband, CW signal. The resulting IF signal is sampled by a high resolution digitizer on the AMC (Advanced Mezzanine Card) side and transported via point-to-point links to an adjacent AMC board. The processing electronics on this board drives a digital-to-analog converter on the rear-side. The analog signal is then filtered and amplified by a high voltage power amplifier which drives the piezo stretcher in the laser. Some preliminary results of laser to RF locking with such a scheme are presented.
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TUPRI109	Construction and Commissioning of Event Timing System at SuperKEKB	linac, injection, positron, software	1829
	H. Kaji, K. Furukawa, M. Iwasaki, E. Kikutani, T. Kobayashi, F. Miyahara, T.T. Nakamura, M. Satoh, M. Suetake, M. Tobiyama KEK, Ibaraki, Japan T. Kudo, S. Kusano Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan T. Okazaki EJIT, Hitachi, Ibaraki, Japan
	The Event Timing System of Injector Linac at KEK is upgraded to satisfy the new requirements for the SuperKEKB project. After finishing the design and feasibility studies, we have constructed the new system at Main Trigger Station of Linac. The new functions are developed in this system to perform the injection control of positrons with the newly constructed damping ring. Besides, we integrate the capability to adjust the trigger timing just 20 ms before injection so that the injection RF-bucket of the ring can be decided at the last minute. Now, both the new system and the current working system are operational at Main Trigger Station. This is important for the smooth taking over of Event Timing System. Even during the construction period, Linac must be operated to provide beams into the two light source rings. In this situation, we can carry out enough tests with the actual condition. These tests do not disturb the regular operation and brush up the Event Timing System to enable the quick startup of the SuperKEKB operation. We report about the detailed configuration of the new system and its commissioning performed in the 2014 spring run period. H. Kaji et al., "Upgrade of Event Timing System at SuperKEKB", proceedings of ICALEPCS13, San Francisco, USA, October 6-11, 2013.
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TUPRI113	Integration of the Timing System for TPS	operation, injection, booster, gun	1833
	C.Y. Wu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.S. Huang, D. Lee, C.Y. Liao NSRRC, Hsinchu, Taiwan
	Timing system for the Taiwan Photon Source (TPS) were setup and ready for accelerator system commissioning. Event based timing system was chosen to satisfy various requirements for the machine and experiments. The system consist of event generator and multiple event receivers which installed local control nodes. The system is ready in the first quarter of 2014. Performance and functionality are investigated systematically. Parameters like delay, skew, latency, drift due to ambient temperature variation, etc. will be addressed. This report wills summary progress of TPS timing system before system delivery for accelerator commissioning.
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TUPRI114	Performance of the TPS RF Reference Distribution Links	booster, distributed, synchrotron, network	1836
	K.T. Hsu, Y.-S. Cheng, K.H. Hu, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	A fibre based 500 MHz RF reference distribution system with femtosecond jitter and temperature drift compensation will deploy for the Taiwan Photon Source (TPS) project. The system consists of several pair’s commercial available continue wave RF fibre links. Installation is performed in the 1st quarter of 2014. Characterize the performance of the install system are in proceeding. Jitter of the transfer RF reference and drift due to ambient temperature effects are investigated systematically. Instrumentation to support the measurement are also addressed. Follow up plans to revise the system configuration and work out to transfer low jitter RF reference to time-resolved experimental stations are in considered. Measurement results will be summarized in this report.
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WEOBB01	Design and Performance of the Optical Fiber Length Stabilization System for SACLA	laser, controls, feedback, experiment	1906
	H. Maesaka, T. Ohshima, Y. Otake RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan S. Matsubara JASRI/SPring-8, Hyogo, Japan
	The x-ray free electron laser facility, SACLA, requires timing synchronization accuracies of less than 50 fs for acceleration rf components and less than 10 fs for pump-and-probe user experiments. Although a stable timing distribution system with optical fiber cables was constructed, a timing drift of more than 100 fs has been observed after the transmission of about 100 m. In order to suppress optical fiber length drift, we developed and installed an optical fiber length stabilization system with a Michelson interferometer. A frequency-stabilized laser with a wavelength of 1.5 um is transmitted together with a timing signal and it is reflected back to the interferometer. The length signal from the interferometer is fed back to a fiber stretcher for fiber length control. A prototype system showed that the length of a 1km-long optical fiber in a feedback loop was stabilized within 0.1 um corresponding to 0.5 fs. From this result, a timing accuracy improvement of pump-and-probe experiments can be expected. In this presentation, the design and basic performance of the optical fiber length stabilization system and the operational experience at SACLA will be reported. H. Maesaka et al., Proceedings of FEL’08, 352 (2008). ** H. Maesaka et al., Proceedings of FEL’12, 325 (2012).
	Slides WEOBB01 [2.673 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOBB01
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WEPRO045	Design of a System at NSRRC to Measure the Field for an In-vacuum Cryogenic Undulator with Permanent Magnet	vacuum, laser, alignment, undulator	2041
	C.K. Yang, C.-H. Chang, T.Y. Chung, J.C. Huang, C.-S. Hwang, Y.Y. Lin NSRRC, Hsinchu, Taiwan
	A cryogenic undulator with a permanent magnet (CPMU) is an important insertion device now under construction at NSRRC. For an undulator of this kind, the distribution of the magnetic field must be measured along the axis; the phase error, trajectory and photon flux must be calculated after the magnetic arrays are installed in the vacuum chamber and cooled to cryogenic temperature. We developed a Hall-probe system to measure the magnetic field in an evacuated environment; this system uses lasers and stages to monitor and to correct dynamically the positions of the Hall probe. All components installed inside the vacuum chamber are compatible with an environment of high vacuum and low temperature. The details of the design and completed fabrication are presented in this paper.
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WEPRO070	Overcoming the Horizontal Depolarizing Resonance in the Brookhaven AGS	resonance, polarization, emittance, betatron	2112
	H. Huang, L. Ahrens, M. Bai, M. Blaskiewicz, K.A. Brown, R. Connolly, Y. Dutheil, W. Fischer, C.J. Gardner, J.W. Glenn, T. Hayes, F. Méot, A. Poblaguev, V.H. Ranjbar, T. Roser, V. Schoefer, K.S. Smith, S. Tepikian, N. Tsoupas, K. Yip, A. Zelenski, K. Zeno, S.Y. Zhang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Imperfection and vertical intrinsic depolarizing resonances have been overcome by the two partial Siberian snakes in the AGS. The relatively weak but numerous horizontal resonances are the main source of polarization loss in the AGS. A pair of horizontal quads have been used to overcome these weak resonances. This technique needs very accurate jump timing. Fast roll-over magnet cycle has been used and it improves the polarization transmission efficiency near extraction when acceleration usually is slowing down. Emittance preservation is also important to mitigate polarization loss. Recent experimental results including jump quad timing and emittance preservation are presented in this paper.
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WEPRO072	The Design of the Fast Raster System for the European Spallation Source	target, power-supply, controls, linac	2118
	H.D. Thomsen, S.P. Møller ISA, Aarhus, Denmark
	The ESS will nominally operate with an average (peak) proton current of 2.5 mA (62.5 mA) at 2.0 GeV. To reduce the beam peak current density at the spallation target, the ESS HEBT will apply a fast transverse raster system consisting of 8 dithering magnet dipoles. The raster system sweeps the linac beamlet on the target surface and gives a rectangular intensity outline within a macropulse of 2.86 ms. The magnets are driven by triangular current waveforms of up to 40 kHz. The preliminary magnet design and power supply topology will be discussed.
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WEPME069	Performance of a Compact LLRF System using Analog RF Backplane in MTCA.4 Crates	controls, distributed, LLRF, operation	2438
	U. Mavrič, M. Fenner, M. Hoffmann, F. Ludwig, A.T. Rosner, H. Schlarb DESY, Hamburg, Germany K. Czuba, T.P. Leśniak Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland A. Rohlev Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	In order to increase system compactness, mitigate cabling problems, increase rack space, minimize points of failure in the system and reduce digital distortion leakage into the sensitive analog signals, the concept of the RF backplane located in the rear section of the MTCA.4 crate has been introduced. Besides signal distribution, the concept includes a signal generation module and backplane management module. The generation and splitting of the analog signals is taking place in slots 15 and 14 on the rear side in theμLO generation module (uLOG). This module generates the local oscillator signal, the clocks and feeds through the master reference signal over the RF backplane to the slots. In this paper we present the recent results of such system.
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WEPME079	LLRF System for the ESS Proton Accelerator	LLRF, cavity, controls, monitoring	2465
	A.J. Johansson, F. Kristensen, A.M. Svensson Lund University, Lund, Sweden R. Zeng ESS, Lund, Sweden
	The European Spallation Source is driven by a proton linear accelerator that will have an average beam power of 5 MW. The accelerator is pulsed at 14 Hz with a pulse length of 2.86 ms, and consists of both normal conduction and superconducting accelerating structures. The long pulse and the high goals of energy efficiency and availability create special challenges for the LLRF system.
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WEPRI116	Master Oscillator for the European XFEL	laser, feedback, low-level-rf, detector	2771
	L.Z. Zembala, K. Czuba, B. Gąsowski, D. Sikora Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland J. Branlard, H. Schlarb, H.C. Weddig DESY, Hamburg, Germany
	The reference signal outage causes breakdown of the synchronisation in the entire accelerator, which could result in a multi-day break in the operation. Therefore, the Master Oscillator (MO) for the European XFEL has to be redundant, in order to achieve extremely high reliability. The redundancy concept, which provides no interruption in the reference signal, requires phase coherence, fast RF switching and sustaining the RF power with a high-Q filter. These features allow to keep possible signal transitions smooth. Furthermore, the MO has to generate a 1.3 GHz signal of exceptionally good phase noise performance – jitter < 35 fs RMS integrated from 10 Hz to1 MHz. One of the problems in the way are vibrations, which have to be properly isolated to avoid microphonics effects in oscillators. The proposed MO architecture and connection with the RF distribution system is described. A basic prototype is tested and results are presented.
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THPRO035	Improving and Maintaining FEL Beam Stability of the LCLS	FEL, feedback, high-voltage, undulator	2943
	F.-J. Decker, A.L. Benwell, W.S. Colocho, Z. Huang, A. Krasnykh, J.R. Lewandowski, T.J. Maxwell, J. Sheppard, J.L. Turner SLAC, Menlo Park, California, USA
	Funding: *Work supported by U.S. Department of Energy, Contract DE-AC02-76SF00515. The beam stability of the Linac Coherent Light Source (LCLS) has seen many improvements over the years and has matured to a state where progress is slow and maintaining the best stability is becoming the main challenge. Single sources which are identified by various means contribute to only about 10 to 20% of the whole jitter power, meaning that their elimination gives only a small improvement of 5 to 10%. New sources need to be identified fast. Especially slow variations of a few seconds to minutes time scale are often hidden and partially corrected by feedback systems. A few episodes of increased jitter have shown the limitations of some of the feedback systems. Stability for all dimensions, transverse, longitudinal, and intensity are presented.
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THPRO090	Energy Calibration and Tune Jumps Efficiency in the pp AGS	polarization, resonance, acceleration, extraction	3095
	Y. Dutheil, L. Ahrens, H. Huang, F. Méot, A. Poblaguev, V. Schoefer, K. Yip BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The AGS tune jump system consists of two fast quadrupoles used to accelerate the crossing of 82 horizontal intrinsic spin resonances. The fast tune jump of ΔQh=+0.04 within 100 μs imposes perfect localization of each of the 82 resonant conditions. Imperfect timing of the tune jumps results in lower efficiency of the system and lower transmission of the polarization through the AGS acceleration cycle. Investigations during the end of the pp AGS Run13 revealed weaknesses in the energy measurement at high energy, causing less than optimal timing of the tune jumps. A new method based on continuous polarization measurement to determine the energy during the acceleration cycle has been developed. Strong operational constraints were taken into account to provide a convenient system of energy measurement. This is also used to calibrate the usual determination of the energy based on revolution frequency of the beam or measured dipole magnetic field. This paper shows the tools developed and the results of the first tests during the AGS Run 14. Simulations of the expected tune jumps efficiency using the AGS Zgoubi model are also presented and compared to experimental results.
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THPRO118	A PLC Test Bench at ESS	PLC, EPICS, controls, vacuum	3171
	D.P. Piso, M. Reščič ESS, Lund, Sweden G. Cijan Cosylab, Ljubljana, Slovenia R. Schmidt CERN, Geneva, Switzerland
	The European Spallation Source (ESS) is an accelerator- driven neutron spallation source. The Integrated Controls Systems (ICS) is responsible for providing control and mon- itoring for all parts of the machine (accelerator, target, neu- tron scattering systems and conventional facilities) [1]. A large number of applications have been identified across all parts of the facility where PLCs will be used: cryogenics, vacuum, water-cooling, power systems, safety and protec- tion systems. The Controls Division at ESS is deploying a PLC Test Bench. The motivation is to evaluate different technologies, to test PLCs and their integration into EPICS, to prototype control systems and use the test bench as PLC software development platform. This report defines the ar- chitecture of this infrastructure. The first stage to procure a first set of hardware and to perform initial tests has already been finished, consisting of a comparison between the per- formance of the s7plc EPICS driver and the Modbus EPICS driver. The results of these tests are discussed and future plans for this infrastructure are presented.
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THPRO130	MaRIE Injector Test-Stand Instrumentation & Control System Conceptual Design	controls, operation, EPICS, diagnostics	3198
	M. Pieck, D. Baros, E. Björklund, J.A. Faucett, J.D. Gilpatrick, J.D. Paul, F.E. Shelley LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by LANL for the U.S. Department of Energy under contract W-7405-ENG-36. Los Alamos National Laboratory (LANL) has defined a signature science facility Matter-Radiation Interactions in Extremes (MaRIE) that builds on the existing Los Alamos Neutron Science Center (LANSCE) facility to provide unique experimental tools to develop next-generation materials that will perform predictably and on demand for currently unattainable lifetimes in extreme environments. At its core a new 42 keV XFEL will be coupled with a MW class proton accelerator. While the larger MaRIE project is working on a pre-conceptual design a smaller LANL team is working on an injector test-stand to be constructed at LANL in the course of preparation for MaRIE. The test stand will consist of a photo injector and an initial accelerating section with a bunch compression section. The goal of this facility will be to carry out studies that will determine optimal design parameters for the prototype injector, and to facilitate a direct demonstration of the required beam characteristics for MaRIE. This paper will give a brief overview of the proposed MaRIE facility and present the conceptual design for the injector test stand with the focus on the instrumentation and control system.
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THPME117	First Tests with the Self-triggered Mode of the New MicroTCA-based Low-charge Electronics for Button and Stripline BPMs at FLASH	electronics, operation, status, interface	3509
	F. Schmidt-Föhre, N. Baboi, G. Kuehn, B. Lorbeer, D. Nölle, K. Wittenburg DESY, Hamburg, Germany
	The FLASH facility at DESY is currently enhanced by a second beamline (FLASH2) to extend the capacity for user experiments. In addition, certain support systems like the timing system and the BPM system at the existing FLASH accelerator have been partly renewed and are now under commissioning. New button BPM electronics based on the MTCA.4 for physics standard is provided for the FLASH2 beamline and is foreseen as a replacement of the old BPM electronics at FLASH. Compared to the predecessor of the FLASH button BPM electronics, the new system has been specifically designed for low charge operation exceeding a wide dynamical charge range between 100pC and 3nC. Special provisions have been made to enable single bunch measurements in a self-triggered mode, enabling timing-system-independent measurements during commissioning and at fallback during normal operation.
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THPME160	Design, Implementation and Preliminary Test Results of the ESS Beam Current Monitor System	FPGA, interface, electronics, linac	3638
	H. Hassanzadegan, A. Jansson, C.A. Thomas ESS, Lund, Sweden J.L. Crisp FRIB, East Lansing, Michigan, USA U. Legat, K. Strniša Cosylab, Ljubljana, Slovenia M. Werner DESY, Hamburg, Germany
	The Beam Current Monitor system of the ESS linac will be mainly based on AC Current Transformers. The BCM system will be used to monitor the beam current and charge in absolute and differential modes. The differential current measurement is also intended for detecting large and sudden beam losses and acting on the Machine Interlock System (MIS), especially in areas where Beam Loss Monitors cannot be reliably used. A demo BCM based on a Bergoz ACCT and MTCA.4 electronics has been procured and integrated into EPICS. A VHDL code has been developed and successfully tested for the required FPGA signal processing including droop compensation, filtering, DC level correction and interfacing to the MIS. This paper gives an overview of the current status of the BCM system design and implementation as well as some preliminary test results in absolute and differential modes.
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THPME161	Integration of Beam Diagnostics Devices for a Therapy Accelerator	software, real-time, controls, beam-diagnostic	3641
	S. Tuma, J. Dedič, M. Klun, L. Šepetavc Cosylab, Ljubljana, Slovenia A. Kerschbaum, F. Osmić, M. Repovž, J. Sanchez Arias EBG MedAustron, Wr. Neustadt, Austria
	MedAustron is a synchrotron based accelerator complex, used for cancer treatment as well as for non-clinical research, and is situated in Wiener Neustadt, Austria. Cosylab has been working closely with MedAustron to develop the core accelerator control system and is now also working on on-site integration of beam diagnostics (BD) devices. These devices are critical for commissioning of the accelerator as well as later during regular operation to ensure high up-time of the machine. Beam instrumentation devices are fully integrated into the Front End Controller Operating System (FECOS) of the accelerator. FECOS is a custom designed control system framework implemented in LabVIEW, which provides unified interfaces and core services to all software components in the system. The Master Timing System component provides configurable real-time events distribution (triggers), essential for measurement and control in sections where the beam is bunched and device actions need to be synchronized. Both companies, MedAustron and Cosylab also developed user interfaces that are designed to be intuitive, while maintaining a level of flexibility for physics research.
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Paper

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Other Keywords

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MOPRO082

Suppression of Stored Beam Oscillation at Injection by Fast Kicker in the SPring-8 Storage Ring

kicker, injection, storage-ring, operation

280

C. Mitsuda, K. Fukami, K. Kobayashi, M. Masaki, H. Ohkuma, S. Sasaki, K. Soutome
JASRI/SPring-8, Hyogo-ken, Japan
T. Nakanishi
SES, Hyogo-pref., Japan

When the injection bump orbit is not closed perfectly at the beam injection, the horizontal stored beam oscillation is excited. In the SPring-8 storage ring, many efforts had been paid to reduce the beam oscillation by adjusting the temporal shape and timing of four bump magnets and by applying a counter kick to the residual oscillation, whose amplitude is as large as 0.4mm and the width is as narrow as 500ns. Now, the averaged oscillation amplitude has successfully been suppressed to the level of less than 0.1mm. To confirm the suppression effect, we observed the turn-by-turn photon beam profile at the diagnostics beamline with the insertion device. We confirmed that the light axis oscillation was significantly suppressed by a factor of 5 comparing by applying a counter kick. We also found that the oscillation shape and the oscillation amplitude, which were caused by the timing shift of firing bump magnets, are drastically changed by only timing shift of one magnet. We are considering the feedback scheme to keep the suppression effect at the initial level during the user-time.

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MOPME069

Upgrade of the Injection Kicker System for J-PARC Main Ring

injection, kicker, feedback, operation

526

T. Sugimoto, K. Fan, K. Ishii, H. Matsumoto
KEK, Ibaraki, Japan

Four lumped inductance injection kicker magnets for the J-PARC main ring (MR) produce a kick of 0.1096 T·m with a 1% to 99% rise-time of about 400 nsec. A residual field of about 6% of the flat-top exists at the tail of the pulse due to an impedance mismatching. The residual field is required to be suppressed less than 1% to reduce injection losses. For a higher intensity beam operation, the kicker rise-time of less than 300nsec is required to inject longer beam bunches which reduces a space charge effect. During the long shutdown in FY2013, 140Ω resistor and 7nF capacitor were connected to the thyratron to improve the post-pulse shape. In addition, an optimization of a capacitance in the matching circuit was carried out to optimize the waveform. As the result, the rise-time of 195nsec and the residual tail field of 2% were achieved. However, another reflection peak of about 9% is appeared. We plan to compensate the effect of the new peak by using a new small kicker magnet. This paper discusses the detail of the circuit and the beam test results.

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TUPRO038

Beam Positioning Concept and Tolerance Considerations for BERLinPro

laser, emittance, linac, gun

1105

B.C. Kuske, J. Rudolph
HZB, Berlin, Germany

Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin, and grants of Helmholtz Association
BERLinPro is an ERL project at Helmholtz-Zentrum Berlin, with the goal to illuminate the challenges and promises of a high brightness 100 mA superconducting RF gun in combination with a 50 MeV return loop and energy recovery [1, 2]. The precision of the beam position in a single turn machine might be relaxed compared to the demands in storage rings. Still, a trajectory correction concept has to be developed and the influence of trajectory offsets on the goal parameters, its dependence on fluctuating injection parameters or effects related to the low energy of 6.5-50 MeV have to be investigated. This paper covers the initial trajectory correction studies and first tolerance scenarios of BERLinPro using the projected hardware concept.

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TUPRI107

Compact MTCA.4 Based Laser Synchronization

laser, FPGA, hardware, FEL

1823

M. Felber, L. Butkowski, H.T. Duhme, M. Fenner, C. Gerth, U. Mavrič, P. Peier, H. Schlarb, B. Steffen
DESY, Hamburg, Germany
T. Kozak, P. Prędki, K.P. Przygoda
TUL-DMCS, Łódź, Poland

In this paper we present a compact and efficient approach for laser synchronization based on MTCA.4 platform. Laser pulses are converted to the RF signals using a photo-diode detector. The RF section performs filtering, amplification and down-conversion of a narrowband, CW signal. The resulting IF signal is sampled by a high resolution digitizer on the AMC (Advanced Mezzanine Card) side and transported via point-to-point links to an adjacent AMC board. The processing electronics on this board drives a digital-to-analog converter on the rear-side. The analog signal is then filtered and amplified by a high voltage power amplifier which drives the piezo stretcher in the laser. Some preliminary results of laser to RF locking with such a scheme are presented.

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TUPRI109

Construction and Commissioning of Event Timing System at SuperKEKB

linac, injection, positron, software

1829

H. Kaji, K. Furukawa, M. Iwasaki, E. Kikutani, T. Kobayashi, F. Miyahara, T.T. Nakamura, M. Satoh, M. Suetake, M. Tobiyama
KEK, Ibaraki, Japan
T. Kudo, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
T. Okazaki
EJIT, Hitachi, Ibaraki, Japan

The Event Timing System of Injector Linac at KEK is upgraded to satisfy the new requirements for the SuperKEKB project. After finishing the design and feasibility studies*, we have constructed the new system at Main Trigger Station of Linac. The new functions are developed in this system to perform the injection control of positrons with the newly constructed damping ring. Besides, we integrate the capability to adjust the trigger timing just 20 ms before injection so that the injection RF-bucket of the ring can be decided at the last minute. Now, both the new system and the current working system are operational at Main Trigger Station. This is important for the smooth taking over of Event Timing System. Even during the construction period, Linac must be operated to provide beams into the two light source rings. In this situation, we can carry out enough tests with the actual condition. These tests do not disturb the regular operation and brush up the Event Timing System to enable the quick startup of the SuperKEKB operation. We report about the detailed configuration of the new system and its commissioning performed in the 2014 spring run period.
* H. Kaji et al., "Upgrade of Event Timing System at SuperKEKB",
proceedings of ICALEPCS13, San Francisco, USA, October 6-11, 2013.

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TUPRI113

Integration of the Timing System for TPS

operation, injection, booster, gun

1833

C.Y. Wu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.S. Huang, D. Lee, C.Y. Liao
NSRRC, Hsinchu, Taiwan

Timing system for the Taiwan Photon Source (TPS) were setup and ready for accelerator system commissioning. Event based timing system was chosen to satisfy various requirements for the machine and experiments. The system consist of event generator and multiple event receivers which installed local control nodes. The system is ready in the first quarter of 2014. Performance and functionality are investigated systematically. Parameters like delay, skew, latency, drift due to ambient temperature variation, etc. will be addressed. This report wills summary progress of TPS timing system before system delivery for accelerator commissioning.

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TUPRI114

Performance of the TPS RF Reference Distribution Links

booster, distributed, synchrotron, network

1836

K.T. Hsu, Y.-S. Cheng, K.H. Hu, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

A fibre based 500 MHz RF reference distribution system with femtosecond jitter and temperature drift compensation will deploy for the Taiwan Photon Source (TPS) project. The system consists of several pair’s commercial available continue wave RF fibre links. Installation is performed in the 1st quarter of 2014. Characterize the performance of the install system are in proceeding. Jitter of the transfer RF reference and drift due to ambient temperature effects are investigated systematically. Instrumentation to support the measurement are also addressed. Follow up plans to revise the system configuration and work out to transfer low jitter RF reference to time-resolved experimental stations are in considered. Measurement results will be summarized in this report.

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WEOBB01

Design and Performance of the Optical Fiber Length Stabilization System for SACLA

laser, controls, feedback, experiment

1906

H. Maesaka, T. Ohshima, Y. Otake
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
S. Matsubara
JASRI/SPring-8, Hyogo, Japan

The x-ray free electron laser facility, SACLA, requires timing synchronization accuracies of less than 50 fs for acceleration rf components and less than 10 fs for pump-and-probe user experiments. Although a stable timing distribution system with optical fiber cables was constructed*, a timing drift of more than 100 fs has been observed after the transmission of about 100 m**. In order to suppress optical fiber length drift, we developed and installed an optical fiber length stabilization system with a Michelson interferometer. A frequency-stabilized laser with a wavelength of 1.5 um is transmitted together with a timing signal and it is reflected back to the interferometer. The length signal from the interferometer is fed back to a fiber stretcher for fiber length control. A prototype system showed that the length of a 1km-long optical fiber in a feedback loop was stabilized within 0.1 um corresponding to 0.5 fs. From this result, a timing accuracy improvement of pump-and-probe experiments can be expected. In this presentation, the design and basic performance of the optical fiber length stabilization system and the operational experience at SACLA will be reported.
* H. Maesaka et al., Proceedings of FEL’08, 352 (2008).
** H. Maesaka et al., Proceedings of FEL’12, 325 (2012).

Slides WEOBB01 [2.673 MB]

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WEPRO045

Design of a System at NSRRC to Measure the Field for an In-vacuum Cryogenic Undulator with Permanent Magnet

vacuum, laser, alignment, undulator

2041

C.K. Yang, C.-H. Chang, T.Y. Chung, J.C. Huang, C.-S. Hwang, Y.Y. Lin
NSRRC, Hsinchu, Taiwan

A cryogenic undulator with a permanent magnet (CPMU) is an important insertion device now under construction at NSRRC. For an undulator of this kind, the distribution of the magnetic field must be measured along the axis; the phase error, trajectory and photon flux must be calculated after the magnetic arrays are installed in the vacuum chamber and cooled to cryogenic temperature. We developed a Hall-probe system to measure the magnetic field in an evacuated environment; this system uses lasers and stages to monitor and to correct dynamically the positions of the Hall probe. All components installed inside the vacuum chamber are compatible with an environment of high vacuum and low temperature. The details of the design and completed fabrication are presented in this paper.

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WEPRO070

Overcoming the Horizontal Depolarizing Resonance in the Brookhaven AGS

resonance, polarization, emittance, betatron

2112

H. Huang, L. Ahrens, M. Bai, M. Blaskiewicz, K.A. Brown, R. Connolly, Y. Dutheil, W. Fischer, C.J. Gardner, J.W. Glenn, T. Hayes, F. Méot, A. Poblaguev, V.H. Ranjbar, T. Roser, V. Schoefer, K.S. Smith, S. Tepikian, N. Tsoupas, K. Yip, A. Zelenski, K. Zeno, S.Y. Zhang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Imperfection and vertical intrinsic depolarizing resonances have been overcome by the two partial Siberian snakes in the AGS. The relatively weak but numerous horizontal resonances are the main source of polarization loss in the AGS. A pair of horizontal quads have been used to overcome these weak resonances. This technique needs very accurate jump timing. Fast roll-over magnet cycle has been used and it improves the polarization transmission efficiency near extraction when acceleration usually is slowing down. Emittance preservation is also important to mitigate polarization loss. Recent experimental results including jump quad timing and emittance preservation are presented in this paper.

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WEPRO072

The Design of the Fast Raster System for the European Spallation Source

target, power-supply, controls, linac

2118

H.D. Thomsen, S.P. Møller
ISA, Aarhus, Denmark

The ESS will nominally operate with an average (peak) proton current of 2.5 mA (62.5 mA) at 2.0 GeV. To reduce the beam peak current density at the spallation target, the ESS HEBT will apply a fast transverse raster system consisting of 8 dithering magnet dipoles. The raster system sweeps the linac beamlet on the target surface and gives a rectangular intensity outline within a macropulse of 2.86 ms. The magnets are driven by triangular current waveforms of up to 40 kHz. The preliminary magnet design and power supply topology will be discussed.

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WEPME069

Performance of a Compact LLRF System using Analog RF Backplane in MTCA.4 Crates

controls, distributed, LLRF, operation

2438

U. Mavrič, M. Fenner, M. Hoffmann, F. Ludwig, A.T. Rosner, H. Schlarb
DESY, Hamburg, Germany
K. Czuba, T.P. Leśniak
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
A. Rohlev
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

In order to increase system compactness, mitigate cabling problems, increase rack space, minimize points of failure in the system and reduce digital distortion leakage into the sensitive analog signals, the concept of the RF backplane located in the rear section of the MTCA.4 crate has been introduced. Besides signal distribution, the concept includes a signal generation module and backplane management module. The generation and splitting of the analog signals is taking place in slots 15 and 14 on the rear side in theμLO generation module (uLOG). This module generates the local oscillator signal, the clocks and feeds through the master reference signal over the RF backplane to the slots. In this paper we present the recent results of such system.

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WEPME079

LLRF System for the ESS Proton Accelerator

LLRF, cavity, controls, monitoring

2465

A.J. Johansson, F. Kristensen, A.M. Svensson
Lund University, Lund, Sweden
R. Zeng
ESS, Lund, Sweden

The European Spallation Source is driven by a proton linear accelerator that will have an average beam power of 5 MW. The accelerator is pulsed at 14 Hz with a pulse length of 2.86 ms, and consists of both normal conduction and superconducting accelerating structures. The long pulse and the high goals of energy efficiency and availability create special challenges for the LLRF system.

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WEPRI116

Master Oscillator for the European XFEL

laser, feedback, low-level-rf, detector

2771

L.Z. Zembala, K. Czuba, B. Gąsowski, D. Sikora
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
J. Branlard, H. Schlarb, H.C. Weddig
DESY, Hamburg, Germany

The reference signal outage causes breakdown of the synchronisation in the entire accelerator, which could result in a multi-day break in the operation. Therefore, the Master Oscillator (MO) for the European XFEL has to be redundant, in order to achieve extremely high reliability. The redundancy concept, which provides no interruption in the reference signal, requires phase coherence, fast RF switching and sustaining the RF power with a high-Q filter. These features allow to keep possible signal transitions smooth. Furthermore, the MO has to generate a 1.3 GHz signal of exceptionally good phase noise performance – jitter < 35 fs RMS integrated from 10 Hz to1 MHz. One of the problems in the way are vibrations, which have to be properly isolated to avoid microphonics effects in oscillators. The proposed MO architecture and connection with the RF distribution system is described. A basic prototype is tested and results are presented.

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THPRO035

Improving and Maintaining FEL Beam Stability of the LCLS

FEL, feedback, high-voltage, undulator

2943

F.-J. Decker, A.L. Benwell, W.S. Colocho, Z. Huang, A. Krasnykh, J.R. Lewandowski, T.J. Maxwell, J. Sheppard, J.L. Turner
SLAC, Menlo Park, California, USA

Funding: *Work supported by U.S. Department of Energy, Contract DE-AC02-76SF00515.
The beam stability of the Linac Coherent Light Source (LCLS) has seen many improvements over the years and has matured to a state where progress is slow and maintaining the best stability is becoming the main challenge. Single sources which are identified by various means contribute to only about 10 to 20% of the whole jitter power, meaning that their elimination gives only a small improvement of 5 to 10%. New sources need to be identified fast. Especially slow variations of a few seconds to minutes time scale are often hidden and partially corrected by feedback systems. A few episodes of increased jitter have shown the limitations of some of the feedback systems. Stability for all dimensions, transverse, longitudinal, and intensity are presented.

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THPRO090

Energy Calibration and Tune Jumps Efficiency in the pp AGS

polarization, resonance, acceleration, extraction

3095

Y. Dutheil, L. Ahrens, H. Huang, F. Méot, A. Poblaguev, V. Schoefer, K. Yip
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The AGS tune jump system consists of two fast quadrupoles used to accelerate the crossing of 82 horizontal intrinsic spin resonances. The fast tune jump of ΔQh=+0.04 within 100 μs imposes perfect localization of each of the 82 resonant conditions. Imperfect timing of the tune jumps results in lower efficiency of the system and lower transmission of the polarization through the AGS acceleration cycle. Investigations during the end of the pp AGS Run13 revealed weaknesses in the energy measurement at high energy, causing less than optimal timing of the tune jumps. A new method based on continuous polarization measurement to determine the energy during the acceleration cycle has been developed. Strong operational constraints were taken into account to provide a convenient system of energy measurement. This is also used to calibrate the usual determination of the energy based on revolution frequency of the beam or measured dipole magnetic field. This paper shows the tools developed and the results of the first tests during the AGS Run 14. Simulations of the expected tune jumps efficiency using the AGS Zgoubi model are also presented and compared to experimental results.

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THPRO118

A PLC Test Bench at ESS

PLC, EPICS, controls, vacuum

3171

D.P. Piso, M. Reščič
ESS, Lund, Sweden
G. Cijan
Cosylab, Ljubljana, Slovenia
R. Schmidt
CERN, Geneva, Switzerland

The European Spallation Source (ESS) is an accelerator- driven neutron spallation source. The Integrated Controls Systems (ICS) is responsible for providing control and mon- itoring for all parts of the machine (accelerator, target, neu- tron scattering systems and conventional facilities) [1]. A large number of applications have been identified across all parts of the facility where PLCs will be used: cryogenics, vacuum, water-cooling, power systems, safety and protec- tion systems. The Controls Division at ESS is deploying a PLC Test Bench. The motivation is to evaluate different technologies, to test PLCs and their integration into EPICS, to prototype control systems and use the test bench as PLC software development platform. This report defines the ar- chitecture of this infrastructure. The first stage to procure a first set of hardware and to perform initial tests has already been finished, consisting of a comparison between the per- formance of the s7plc EPICS driver and the Modbus EPICS driver. The results of these tests are discussed and future plans for this infrastructure are presented.

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THPRO130

MaRIE Injector Test-Stand Instrumentation & Control System Conceptual Design

controls, operation, EPICS, diagnostics

3198

M. Pieck, D. Baros, E. Björklund, J.A. Faucett, J.D. Gilpatrick, J.D. Paul, F.E. Shelley
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by LANL for the U.S. Department of Energy under contract W-7405-ENG-36.
Los Alamos National Laboratory (LANL) has defined a signature science facility Matter-Radiation Interactions in Extremes (MaRIE) that builds on the existing Los Alamos Neutron Science Center (LANSCE) facility to provide unique experimental tools to develop next-generation materials that will perform predictably and on demand for currently unattainable lifetimes in extreme environments. At its core a new 42 keV XFEL will be coupled with a MW class proton accelerator. While the larger MaRIE project is working on a pre-conceptual design a smaller LANL team is working on an injector test-stand to be constructed at LANL in the course of preparation for MaRIE. The test stand will consist of a photo injector and an initial accelerating section with a bunch compression section. The goal of this facility will be to carry out studies that will determine optimal design parameters for the prototype injector, and to facilitate a direct demonstration of the required beam characteristics for MaRIE. This paper will give a brief overview of the proposed MaRIE facility and present the conceptual design for the injector test stand with the focus on the instrumentation and control system.

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THPME117

First Tests with the Self-triggered Mode of the New MicroTCA-based Low-charge Electronics for Button and Stripline BPMs at FLASH

electronics, operation, status, interface

3509

F. Schmidt-Föhre, N. Baboi, G. Kuehn, B. Lorbeer, D. Nölle, K. Wittenburg
DESY, Hamburg, Germany

The FLASH facility at DESY is currently enhanced by a second beamline (FLASH2) to extend the capacity for user experiments. In addition, certain support systems like the timing system and the BPM system at the existing FLASH accelerator have been partly renewed and are now under commissioning. New button BPM electronics based on the MTCA.4 for physics standard is provided for the FLASH2 beamline and is foreseen as a replacement of the old BPM electronics at FLASH. Compared to the predecessor of the FLASH button BPM electronics, the new system has been specifically designed for low charge operation exceeding a wide dynamical charge range between 100pC and 3nC. Special provisions have been made to enable single bunch measurements in a self-triggered mode, enabling timing-system-independent measurements during commissioning and at fallback during normal operation.

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THPME160

Design, Implementation and Preliminary Test Results of the ESS Beam Current Monitor System

FPGA, interface, electronics, linac

3638

H. Hassanzadegan, A. Jansson, C.A. Thomas
ESS, Lund, Sweden
J.L. Crisp
FRIB, East Lansing, Michigan, USA
U. Legat, K. Strniša
Cosylab, Ljubljana, Slovenia
M. Werner
DESY, Hamburg, Germany

The Beam Current Monitor system of the ESS linac will be mainly based on AC Current Transformers. The BCM system will be used to monitor the beam current and charge in absolute and differential modes. The differential current measurement is also intended for detecting large and sudden beam losses and acting on the Machine Interlock System (MIS), especially in areas where Beam Loss Monitors cannot be reliably used. A demo BCM based on a Bergoz ACCT and MTCA.4 electronics has been procured and integrated into EPICS. A VHDL code has been developed and successfully tested for the required FPGA signal processing including droop compensation, filtering, DC level correction and interfacing to the MIS. This paper gives an overview of the current status of the BCM system design and implementation as well as some preliminary test results in absolute and differential modes.

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THPME161

Integration of Beam Diagnostics Devices for a Therapy Accelerator

software, real-time, controls, beam-diagnostic

3641

S. Tuma, J. Dedič, M. Klun, L. Šepetavc
Cosylab, Ljubljana, Slovenia
A. Kerschbaum, F. Osmić, M. Repovž, J. Sanchez Arias
EBG MedAustron, Wr. Neustadt, Austria

MedAustron is a synchrotron based accelerator complex, used for cancer treatment as well as for non-clinical research, and is situated in Wiener Neustadt, Austria. Cosylab has been working closely with MedAustron to develop the core accelerator control system and is now also working on on-site integration of beam diagnostics (BD) devices. These devices are critical for commissioning of the accelerator as well as later during regular operation to ensure high up-time of the machine. Beam instrumentation devices are fully integrated into the Front End Controller Operating System (FECOS) of the accelerator. FECOS is a custom designed control system framework implemented in LabVIEW, which provides unified interfaces and core services to all software components in the system. The Master Timing System component provides configurable real-time events distribution (triggers), essential for measurement and control in sections where the beam is bunched and device actions need to be synchronized. Both companies, MedAustron and Cosylab also developed user interfaces that are designed to be intuitive, while maintaining a level of flexibility for physics research.

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