IPAC2017 - List of Keywords (timing)

Paper	Title	Other Keywords	Page
MOOCB1	Time-Resolved Energy Spread Studies at the ANKA Storage Ring	storage-ring, radiation, detector, synchrotron	53
	B. Kehrer, E. Blomley, M. Brosi, E. Bründermann, A.-S. Müller, M.J. Nasse, M. Schedler, M. Schuh, M. Schwarz, P. Schönfeldt, N.J. Smale, J.L. Steinmann KIT, Karlsruhe, Germany N. Hiller PSI, Villigen PSI, Switzerland P. Schütze DESY, Hamburg, Germany
	Funding: This work has been supported by the Initiative and Networking Fund the Helmholtz Association under contract number VH-NG-320 and the BMBF under contract numbers 05K13VKA and 05K16VKA. Recently, a new setup for measuring the beam energy spread has been commissioned at the ANKA storage ring at the Karlsruhe Institute of Technology. This setup is based on a fast-gated intensified camera and detects the horizontal profiles of individual bunches in a multi-bunch environment on a single-turn base. As the radiation source point is located in a dispersive section of the storage ring, this allows time-resolved studies of the energy spread. These studies are of particular interest in the framework of short-bunch beam dynamics and the characterization of instabilities. The system is fully synchronized to other beam diagnostics devices allocated in various places along the storage ring, such as the single-shot electro-optical spectral decoding setup or the turn-by-turn terahertz detection systems. Here we discuss the results of the synchronous measurements with the various systems with special emphasis on the energy spread studies.
	Slides MOOCB1 [6.514 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCB1
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB061	DAΦNE BTF Improvements of the Transverse Beam Diagnostics	software, detector, linac, positron	250
	P. Valente INFN-Roma, Roma, Italy B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta INFN/LNF, Frascati (Roma), Italy
	The DAΦNE BTF (beam-test facility) can provide electrons and positrons, tuning at runtime different beam parameters: energy (from about 50 MeV up to 750 MeV for e^- and 540 MeV for e+), intensity (from single particle up to 10¹⁰/bunch) and pulse length (in the range 1.5-40 ns) up to 49 Hz, depending on the operations of the DAΦNE collider. The beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad (downstream of the vacuum beam-pipe exit window), matching the user needs. We describe of the BTF beam transverse monitor systems based on FitPIX detectors, operating in bus synchronization mode externally timed to the BTF beam. We also describe our custom software allowing the acquisition and synchronization of the beam diagnostics with the users data, using TCP/IP calls to MEMCACHED. The performance of the system in a variety of beam intensity, energy and focusing conditions is reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB061
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB125	Post-Mortem System for the Taiwan Photon Source	kicker, operation, photon, data-acquisition	422
	C.Y. Liao, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Huang, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source (TPS), a 3-GeV third-generation synchrotron light source located in Hsinchu, is available to users since 2016. During operation, it will inevitably encounter system trips caused by beam losses. Thus, a post-mortem (PM) system is an important tool to analyze the cause of such events. Main functions of the PM system are: (i) PM trigger will be generated when the stored beam is suddenly lost abnormally; (ii) storage of relevant signals when the server receives such a trigger; (iii) PM Viewer to analyze each event and understand the cause and effect of a beam trip event. The post-mortem system architecture, plans and implementation will be discussed in this report.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB125
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPIK043	Beam-Based Waveform Measurements of the CERN PS Injection Kicker	kicker, flattop, injection, impedance	603
	V. Forte, W. Bartmann, J.C.C.M. Borburgh, L.M.C. Feliciano, A. Ferrero Colomo, M.A. Fraser, T. Kramer, L. Sermeus CERN, Geneva, Switzerland
	In the framework of the LHC Injectors Upgrade (LIU) project, a beam-based technique has been developed for measuring the waveform the CERN Proton Synchrotron (PS) horizontal injection kicker, named KFA45. The technique avoids the need for tedious magnetic measurements, especially when a spare magnet is presently unavailable and measuring the operational magnet with a magnetic field probe is complicated by integration reasons. In this paper, the technique and results of the waveform measurements are summarised. The results already provide additional information in terms of waveform characterisation for the validation of numerical simulations and are of great interest for the future LIU performance upgrade.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK043
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB038	Electron Acceleration With a Ultrafast Gun Driven by Single-Cycle Terahertz Pulses	electron, gun, acceleration, laser	1406
	C. Zhou, F. Ahr, A-L. Calendron, H. Cankaya, M. Fakhari, A. Fallahi, F.X. Kärtner, N.H. Matlis, W. Qiao, X. Wu, D. Zhang CFEL, Hamburg, Germany R.W. Aßmann, U. Dorda, K. Galaydych, B. Marchetti, G. Vashchenko, T. Vinatier DESY, Hamburg, Germany
	Funding: This work was supported by the European Research Council under the European Union Seventh Framework Program (FP/2007-2013)/ERC Grant Agreement no. 609920. We present results on an improved THz-driven electron gun using transversely-incident single-cycle THz pulses using a horn-coupler. Intrinsic synchronization between the electrons and the driving field was achieved by using a single laser system to create electrons by UV photoemission and to create THz radiation by difference frequency generation in a tilted-pulse front geometry. Details of the optical setups for the UV and THz pulses will be described as well as preliminary results showing evidence of electron acceleration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB038
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK078	Machine Protection Risk Management of the ESS Target System	target, proton, cryogenics, operation	1876
	R. Andersson, E. Bargalló, L.S. Emås, J. Harborn, A. Lundgren, U. Odén, J. Ringnér, K. Sjögreen ESS, Lund, Sweden
	The European Spallation Source target system is, together with the proton linac, the main component in the spallation process. ESS will use a 4-ton, helium-cooled, rotating tungsten target for this purpose, and its protection and availability is paramount to the success of ESS. High demands are placed on all of the target equipment, including cooling, movement, rotation, and timing, in order to reach the facility-wide 95% availability goal for neutron production. Machine protection has defined a set of protection functions that are to be implemented for the target system. This paper describes the development of these protection functions through the use of classic HAZOPs combined with modern safety standard lifecycle management. The implementation of these functions is carried out through close collaboration between the target system owners and the machine protection group at ESS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK078
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK079	Development and Status of Protection Functions for the Normal Conducting LINAC at ESS	linac, vacuum, proton, monitoring	1880
	R. Andersson, E. Bargalló, S. Kövecses, A. Nordt, M. Zaera-Sanz ESS, Lund, Sweden C. Hilbes, M. Rejzek ZHAW, Winterthur, Switzerland
	The European Spallation Source faces a great challenge in succeeding with its ambitious availability goals. The aim is to construct a machine that allows for 95% availability for neutron beam production. This goal requires a robust protection system that allows for high availability by continuously monitoring and acting on the machine states, in order to avoid long facility downtimes and optimize the operation at any stage. The normal conducting section consists of the first 48 meters of the machine, and performs the initial acceleration, bunching, steering, and focusing of the beam, which sets it up for optimal transition into the superconducting section. Through a fit-for-purpose risk management process, a set of protection functions has been identified. The risk identification, analysis, and treatment were done in compliance with modern safety and ISO standards. This ensures that the risks, in this case downtime and equipment damage, are properly prevented and mitigated. This paper describes this process of defining the protection functions for the normal conducting linac at ESS.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK079
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA007	Impact of LHC and SPS Injection Kicker Rise Times on Lhc Filling Schemes and Luminosity Reach	injection, kicker, emittance, luminosity	2043
	W. Bartmann, M.J. Barnes, J. Boyd, E. Carlier, A. Chmielinska, B. Goddard, G. Kotzian, C. Schwick, L.S. Stoel, D. Valuch, F.M. Velotti, V. Vlachodimitropoulos, C. Wiesner CERN, Geneva, Switzerland
	The 2016 LHC proton filling schemes generally used a spacing between injections of batches of bunches into SPS and LHC corresponding to the design report specification for the SPS and LHC injection kicker rise times, respectively. A reduction of the batch spacing can be directly used to increase luminosity without detrimental effects on beam stability, and with no increase in the number of events per crossing seen by the experiments. Measurements and simulations were performed in SPS and LHC to understand if a shorter injection kicker rise time and associated tighter batch spacing would lead to increased injection oscillations of the first and last bunches of a bunch train and eventually also a systematic growth of the transverse emittance. The results were used to define the minimum possible batch spacing for an acceptable emittance growth in LHC, with gains of reductions of about 10% possible in both machines. The results are discussed, including the potential improvement of the LHC luminosity for different filling schemes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA007
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA149	AGS Polarized Proton Operation Experience in RHIC Run17	emittance, booster, polarization, proton	2452
	H. Huang, P. Adams, J. Beebe-Wang, M. Blaskiewicz, K.A. Brown, C.J. Gardner, C.E. Harper, C. Liu, F. Méot, J. Morris, A. Poblaguev, V.H. Ranjbar, D. Raparia, T. Roser, V. Schoefer, S. Tepikian, N. Tsoupas, K. Yip, A. Zelenski, K. Zeno 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 Alternating Gradient Synchrotron (AGS). The relatively weak but numerous horizontal resonances are overcome by a pair of horizontal tune jump quads. 70% proton polarization has been achieved for 2·10¹¹ intensity. Further gain can come from maintaining smaller transverse emittance with same beam intensity. The main efforts now are to reduce the transverse emittance in the AGS and Booster, as well as robust jump quads timing generation scheme. This paper summarizes the operation results in the injectors.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA149
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB007	Pseudo Single Bunch Qualities Added to Short Pulse Operation of BESSY II	experiment, synchrotron, operation, radiation	2574
	R. Müller, T. Birke, F. Falkenstern, K. Holldack, A. Jankowiak, M. Ries, A. Schälicke HZB, Berlin, Germany
	Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association BESSY II features sophisticated filling patterns as well as manipulation and separation techniques of custom bunches to serve both timing and photon hungry experiments at the same time. Recently, the low alpha operation mode, providing bunch lengths as short as 2 ps, was extended by pseudo single bunch options. A robust technique to excite one bunch with constant displacement and enlargement was implemented for pulse picking by resonant excitation (PPRE)* users. In addition, reliable scraping of an isolated bunch to provide zero current bunch length is opening new timing opportunities. The simultaneous usage of different photon characteristics: high intensity CSR, non-bursting CSR, short duration as well as operation mode specific X-rays impose new challenges. Sensitive tune measurements and feedback mechanisms had to be developed for all three dimensions. Negative alpha is in consideration to overcome the top up efficiency constraints. R. Müller et.al. BESSY II Supports an Extensive Suite of Timing Experiments, IPAC16 *K. Holldack et.al. Single bunch X-ray pulses on demand from a multi-bunch SR source, Nature Comm.5, 2014
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB007
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB014	PETRA III Operation	operation, photon, experiment, optics	2589
	M. Bieler, I.V. Agapov, H. Ehrlichmann, J. Keil, G.K. Sahoo, R. Wanzenberg DESY, Hamburg, Germany
	At DESY the Synchrotron Light Source PETRA III offers scientists outstanding opportunities for experiments with hard X-rays of exceptionally high brilliance since 2009. This paper describes the challenges of daily operation, including different bunch patterns and their side effects, a procedure to clear spurious bunches, the operational statistics and the main contributions to down time.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB014
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB073	First Measurements of Pulse Picking by Resonant Excitation (PPRE) at the MAX IV 3 GeV Storage Ring	emittance, storage-ring, diagnostics, feedback	2750
	T. Olsson, Å. Andersson MAX IV Laboratory, Lund University, Lund, Sweden
	At synchrotron light storage rings there is demand for serving high-brilliance users requesting multibunch operation while simultaneously serving timing users who require single-bunch operation. One method to accomplish this is PPRE developed and currently in user operation at BESSY-II. In the method, the transverse emittance of one of the bunches in the bunch train is increased by an incoherent betatron excitation. Part of the light from this bunch can then be separated from the multibunch light by an aperture in the beamline, resulting in single-bunch light for the experiment. Methods such as this expand the scope of storage rings without requiring special fill patterns. This is of growing interest due to the upgrade trend towards diffraction-limited storage rings where it becomes more challenging to operate with inhomogeneous fill patterns. Measurements of PPRE were performed at the MAX IV 3 GeV storage ring utilizing the bunch-by-bunch feedback system both for excitation and as a diagnostic. Furthermore, measurements involving direct beam imaging at the diagnostics beamline allowed quantifying the effect of this excitation on the horizontal and vertical emittance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB073
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA060	Construction of the New Kicker Magnet Systems for PF-Advanced Ring	kicker, injection, impedance, power-supply	3401
	A. Ueda, S. Asaoka, T. Honda, S. Nagahashi, N. Nakamura, T. Nogami, H. Takaki, T. Uchiyama KEK, Ibaraki, Japan
	From July 2016 we are constructing a new beam transport (BT) line for the Photon Factory Advanced Ring (PF-AR). The new BT line was designed to transport the full energy 6.5-GeV beam directly from the LINAC, and the top up injection will be possible for the PF-AR. We designed and produced new kicker systems for this project. Three kicker magnets are used for the injection of the 6.5-GeV beam. The kicker magnets were designed as a window frame type ferrite core magnet. The magnetic fields of these magnets have been measured by the search coil method. We paid attention to evaluating eddy current losses of the metal coated ceramic duct in the magnetic field measurement.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA060
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA065	High Precision Magnet Powering for the SESAME Storage Ring	power-supply, controls, dipole, quadrupole	3418
	S.Kh. Jafar, I.A. Abid, A. Ismail SESAME, Allan, Jordan E.O. Ari ASELSAN A.S., Ankara, Turkey M.C. Bastos, T. Henschel CERN, Geneva, Switzerland E.H. Yousefi ILSF, Tehran, Iran
	SESAME is the first synchrotron light source for the Middle East and is expected to start its operation mid-2017. It is composed of a 22 MeV Microtron, a 0.8 GeV booster synchrotron and a 2.5 GeV storage ring. The storage ring magnets and power supplies were designed, produced and validated under the framework of a collaboration between SESAME and CERN, supported by the European Commission. The power supply control strategy for the SESAME main ring follows the same model used in the LHC, where the power supplies are voltage sources bought from industry, to which a specially designed control unit and current sensors are added to implement a high precision current source. This strategy provides modularity, ease of maintenance, better control over performance and flexibility for the machine. Machine flexibility is further enhanced by individually powering the quadrupole magnets. In this paper, the powering strategy, design and validation of the magnet power supplies are described. Some of the challenges faced during those phases are discussed. Finally, performance results are presented, showing stability of the dipole power supply at nominal current of about 10 parts per million.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA065
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA150	New Controller for High Voltage Converter Modulator at Spallation Neutron Source	controls, LabView, interface, high-voltage	3621
	D.L. Brown, X. Geng, S.W. Lee, M. Wezensky, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA
	Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. We have developed a new control system for the high voltage converter modulator at the Spallation Neutron Source to replace the original control system designed by Los Alamos National Laboratory which is approaching obsolescence. The new controller, based on national instruments PXI/FlexRIO FPGA hardware, offers enhancements over the original system such as modular construction, flexibility and non-proprietary software. The new controller also provides new capabilities like modulator pulse flattening, waveform capture & first fault detection. This paper will discuss the design of the system, including the human machine interface, based on lessons learned at the Spallation Neutron Source and other projects. It will also discuss performance and other issues related to operation in an accelerator facility which requires high availability. To date half of the high voltage converter modulators have been upgraded with the new controller with the remainder scheduled for completion by mid-2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA150
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB061	Limiting Effects in the Double EEX Beamline	emittance, shielding, simulation, dipole	3858
	G. Ha POSTECH, Pohang, Kyungbuk, Republic of Korea M.E. Conde, D.S. Doran, J.G. Power ANL, Argonne, Illinois, USA
	Funding: This work is supported by Department of Energy, Office of High Energy Physics, under Contract No. DE-AC02-06CH11357. The double emittance exchange (EEX) beamline is suggested to overcome the large horizontal emittance and transverse jitter issues associated with the single EEX beamline while preserving its powerful phase-space manipulation capability. However, the double EEX beamline also has potential limitations due to coherent synchrotron radiation (CSR) and transverse jitter. The former limitation arises because double EEX uses twice as many bending magnets as single EEX which means stronger CSR effects degrading the beam quality. The latter limitation arises because a longitudinal jitter in front of the first EEX beamline is converted into a transverse jitter in the middle section (between the EEX beamlines) which can cause beam loss or beam degradation. In this paper, we numerically explore the effects of these two limitations on the emittance and beam transport.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB061
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB097	Phase Calibration of Synchrotron RF Signals	operation, cavity, synchrotron, LLRF	3945
	A. Andreev, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany H. Klingbeil, D.E.M. Lens GSI, Darmstadt, Germany
	In the scope of FAIR's scientific program higher beam intensities will be achieved and several new synchrotrons (including storage rings) are being built. The low-level RF (LLRF) systems of FAIR have to support multi-harmonic operations, barrier bucket generation and bunch compression in order to meet the desired beam quality requirements. All this imposes several requirements on the LLRF systems. For example the phase error of the gap voltage of a specific RF cavity must be less than 3 degrees. Thus, each individual component must have a better accuracy. The RF reference signals for the FAIR synchrotron RF cavity systems are generated by direct digital synthesis (DDS). Four so-called Group DDS modules are mounted in one crate. In the supply rooms, the reference signals of such a crate are then distributed to local cavity LLRF systems. Therefore, the precise phase calibration of Group DDS modules is of importance. A phase calibration method with respect to the absolute phases of DDS modules defined by means of the FAIR Bunch Phase Timing System (BuTiS) is developed, and its precision is under evaluation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB097
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB108	Femtosecond Optical Synchronization System for the European XFEL	laser, FEL, free-electron-laser, electron	3969
	C. Sydlo, M. Felber, C. Gerth, T. Kozak, T. Lamb, J.M. Müller, H. Schlarb, F. Zummack DESY, Hamburg, Germany
	Accurate timing synchronization on the femtosecond timescale is an essential installation for time-resolved experiments at free-electron lasers (FELs) such as FLASH and the upcoming European XFEL. Conventional RF timing systems suffer from RF attenuation for such long distances and have reached to date a limit for synchronization precision of around 100 femtoseconds. An optical synchronization system is used at FLASH and is based on the distribution of femtosecond laser pulses over actively stabilized optical fibers. The upcoming European XFEL has raised the demands due to its large number of stabilized optical fibers and a length of 3400 m. The increased lengths for the stabilized optical fibers necessitated major advancement in precision to achieve the requirement of less than 10 femtosecond precision. This paper reports on the status of the laser-based synchronization system at the European XFEL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB108
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB109	Fs Level Laser-to-RF Synchronization at REGAE	laser, detector, electron, electronics	3972
	M. Titberidze, M. Felber, T. Lamb, H. Schlarb, C. Sydlo DESY, Hamburg, Germany R.A. Loch MPSD, Hamburg, Germany
	The Relativistic Electron Gun for Atomic Exploration (REGAE) is a unique linear accelerator capable of producing ultrashort (~ 10 fs) electron bunches for studying fast processes in matter by means of ultrafast electron diffraction (UED) experiments. Additionally, REGAE is suitable for upcoming external injection experiments for laser wakefield acceleration (LWFA). In order to carry out both mentioned experiments, it is crucial to achieve fs level stability in terms of Laser-to-RF synchronization. In this paper we present an advanced laser-to-RF synchronization scheme based on integrated Mach-Zehnder modulator. The setup demonstrated the Titanium Sapphire photo-injector laser synchronization with 11 fs (rms) precision in the bandwidth up to 100 kHz. Long term timing drift measurements showed unprecedented peak-to-peak stability of 31 fs (7 fs rms) over 43 hours of measurement time. In addition, AM-PM coefficient of the MZM based laser-to-RF synchronization setup has been evaluated and showed a factor of 10 improved performance compared to conventional direct conversion based laser synchronization setup.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB109
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB110	Custom Optomechanics for the Optical Synchronization System at the European XFEL	laser, alignment, FEL, coupling	3976
	F. Zummack, M. Felber, C. Gerth, T. Lamb, J.M. Müller, M. Schäfer, H. Schlarb, C. Sydlo DESY, Hamburg, Germany
	Free-electron-lasers like the upcoming European XFEL demand highly reliable optical synchronization in range of few femtoseconds. The well known optical synchronization system at FLASH had to be re-engineered to meet XFEL requirements comprising demands like ten times larger lengths and raised numbers of optically synchronized instruments. These requirements directly convert to optomechanical precision and have yielded in a specialized design accounting for economical manufacturing technologies. These efforts resulted in reduced spatial dimensions, improved optical repeatability, maintainability and even reduced production costs. To account for thermal influences the heart of the optical synchronization system is based on an optical table made out of SuperInvar. To fully exploit its excellent thermal expansion coefficient, mechanical details need to be taken into account. This work presents the design and its realization of the re-engineered optomechanical parts of the optical synchronization system, comprising mounting techniques, link stabilization units and optical delay lines for high drift suppression.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB110
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB113	Time Synchronization for Distant IOCs of the SuperKEKB Accelerators	EPICS, operation, linac, network	3982
	H. Kaji, T. Naito, S. Sasaki KEK, Ibaraki, Japan Y. Iitsuka EJIT, Hitachi, Ibaraki, Japan
	The time synchronization for multi CPU system is always a problem to be worried. The control system of accelerator is no exception since it consists of a lot of CPUs located among large area distantly. The problem appears conspicuously when the beam is aborted. Usually, several hardware show abort signals in one beam abort event. However it is difficult to know which is the source of beam abort and which issues an abort signal under the influence of original failure. We introduce the time synchronization system of the SuperKEKB collider which choose EPICS as the control software. The system utilize Event Timing System and synchronizes the EPICS general time for I/O controllers located distantly. The accuracy of synchronization is around 10ns. It is the excellent performance in terms of synchronization of CPU time. The all abort channels of SuperKEKB are synchronized their issued time. Besides they synchronize with also the injector linac which is operated with the different control system in different network.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB113
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB118	Stabilization of Timing System Operation of J-PARC Linac and RCS	operation, linac, network, software	4000
	H. Takahashi, N. Hayashi JAEA/J-PARC, Tokai-mura, Japan Y.I. Itoh Total Support Systems Corporation, Tokai-mura, Naka-gun, Ibaraki, Japan M. Kawase, Y. Sawabe Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
	At the timing system for J-PARC Linac and Rapid Cycling Synchrotron (RCS), the distribution of timing information (beam tag, type, etc.) and the monitoring and control of timing system are performed via the reflective memory (RFM). The more 10 years elapsed after operation start of J-PARC. Therefore, it is concerned about the occurrence of malfunctions due to time-related deterioration of the devices of timing system. Especially, the malfunctions of a management computer to monitor and control the all timing devices and RFMs to configure the timing system data network have a significant impact. Then, the management computer was renewed and PCI-Express RFMs are installed instead of PCI RFMs. However, after renewal computer, the trouble by data corruption of RFM network was happened anew. In this paper, the contents and the results our cause investigation of data corruption and those of the measures employed for stabilizing the timing system operation are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB118
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB153	An Online Multi-Objective Optimisation Package	injection, controls, kicker, storage-ring	4092
	I.P.S. Martin, M. Apollonio, R. Bartolini, M.J. Furseman DLS, Oxfordshire, United Kingdom R. Bartolini, G.A. Bird JAI, Oxford, United Kingdom D.R. Obee Durham University, Durham, United Kingdom
	The overall performance of an electron storage ring is critically dependant on a large number of variables. It can be characterised in many ways, such as by lifetime, injection efficiency, beam stability and so on. It is frequently the case however that improving one parameter comes at the cost of harming another. Equally, given the large number of variables involved in optimising the ring performance, the true, global optimum solution may be difficult to identify using simple parameter scans. In order to address this problem, a flexible optimisation tool has been developed. This tool is capable of optimising several parameters at once and can cope with an arbitrary number of variables (individually or in families). The tool is designed to be robust to measurement noise, and has been applied to a number of different optimisation problems. This paper presents an overview of the package, as well as the results of the first tests.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB153
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK096	Jitter Measurement to 10ppm Level for Pulsed RF Power Amplifiers 3 - 12GHz	operation, hardware, kicker, pulsed-power	4314
	C.H. Gough, S. Dordevic, M. Paraliev PSI, Villigen PSI, Switzerland
	Linacs for FEL applications require a low jitter RF path from RF source through pulsed amplifiers, klystron / modulators and cavities. For the SwissFEL project, pulsed solid state power amplifiers of the 500W / 3us class for driving the klystrons were required. For these amplifiers, a stable and reliable interferometer system was developed to measure the residual RF jitter levels to <10 ppm (parts per million) and <10 urad (0.6mdeg) rms. This paper describes the system and gives some measurement results for 3GHz, 5.7GHz and 12GHz amplifiers.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK096
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA055	The Preliminary Performance of the Timing and Synchronization System at Tsinghua University	LLRF, laser, monitoring, controls	4565
	Z.Y. Lin, Y.-C. Du, W.-H. Huang, W.-H. Huang, C.-X. Tang, C.-X. Tang, J. Yang TUB, Beijing, People's Republic of China J.M. Byrd, L.R. Doolittle, G. Huang, Q. Qiang, R.B. Wilcox, Y.L. Xu LBNL, Berkeley, California, USA
	A precise timing and synchronization system is developed in Tsinghua University(THU). The whole system scheme includes fiber-based CW carrier phase reference distribution system (PRDS) for delivering stabilized RF phase reference to multiple receiver clients, Low Level RF (LLRF) control system to stabilized the accelerating mi-crowave field and laser-RF synchronization system for high precise synchronization of optical and RF signals. The system test and the demonstration experiment of each subsystem are carried on to evaluate the system and the phase error jitter resources are analysed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA055
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA064	Timing System at ESS	EPICS, distributed, operation, proton	4588
	J. Cereijo García, T. Korhonen, J.H. Lee, D.P. Piso ESS, Lund, Sweden R.R. Osorio UDC, A Coruña, Spain
	The European Spallation Source (ESS) is a research facility being built in Lund (Sweden) that will produce neutrons by the spallation process. It uses the Micro-Research Finland (MRF) Timing System, which provides a complete event-based timing distribution system. The timing signal generation consists of a basic topology: an Event Generator (EVG), an optical distribution layer (fan-out modules) and an array of Event Receivers (EVRs). The timing system will provide clock synchronization and timing services to devices with real time requirements. Its main purposes are event generation and distribution, time stamping and synchronous data transmission. The event clock frequency will be 88.0525 MHz, divided down from the bunch frequency of 352.21 MHz. An integer number of ticks of this clock will define the beam macropulse full length, around 2.86 ms, with a repetition rate of 14 Hz. ESS will be the first facility to deploy large amounts of uTCA EVRs, and is planning to take advantage of the features provided by the uTCA standard, like trigger and clock distribution over the backplane. These EVRs are already being deployed in some systems and test stands.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA064
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA095	Storage Ring Injection Kickers Alignment Optimization in NSLS-II	kicker, injection, storage-ring, operation	4683
	G.M. Wang, W.X. Cheng, J. Choi, T.V. Shaftan, X. Yang BNL, Upton, Long Island, New York, USA
	The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The SR is designed to work in top-off injection mode. The injection straight includes a septum and four fast kicker magnets with independent amplitude and timing control. Ideally, fast kickers formed a local bump, which is transparent to stored beam during top off injection. Due to mismatch of kicker voltage, timing or waveform, there is residual betatron oscillation and impact normal operation. This paper will present the injection kicker waveform measurement with beam, local and global alignment optimization to in improve top off injection transition.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA095
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA104	Design of New Spectrum Data Acquisition System	interface, framework, data-acquisition, controls	4707
	Z.X. Shao, H. Gao, W. Liu, C.Y. Pan USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Project supported by the National Basic Research Program of China, the National Key Scientific Instrument and Equipment Development Projects, China (2014YQ120351). To solve the problem of spectrum acquisition in LIBS (Laser-Induced Breakdown Spectroscopy), a real-time data acquisition system was designed based on PSoC (Programmable System-On-Chip). First, the linear array CCD with electronic shutter function TCD1304DG has been used as detector .And then, the AD7621, a 16-bit analog-to-digital converter, was used to convert signal from the AFE (Analog Front End). After that, a high-integrated, low-power PSoC5LP was used as core controller, it works to complete the driver and data communication, including CCD , ADC, FIFO, the USB interface, etc. At last, a WIFI module has been added to the system for the convenience of users as well as follow-up research. The result through board-level testing indicates that the system in the spectrum acquisition is stable and accurate, and the indicators meet the LIBS project requirements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA104
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOOCB1

Time-Resolved Energy Spread Studies at the ANKA Storage Ring

storage-ring, radiation, detector, synchrotron

53

B. Kehrer, E. Blomley, M. Brosi, E. Bründermann, A.-S. Müller, M.J. Nasse, M. Schedler, M. Schuh, M. Schwarz, P. Schönfeldt, N.J. Smale, J.L. Steinmann
KIT, Karlsruhe, Germany
N. Hiller
PSI, Villigen PSI, Switzerland
P. Schütze
DESY, Hamburg, Germany

Funding: This work has been supported by the Initiative and Networking Fund the Helmholtz Association under contract number VH-NG-320 and the BMBF under contract numbers 05K13VKA and 05K16VKA.
Recently, a new setup for measuring the beam energy spread has been commissioned at the ANKA storage ring at the Karlsruhe Institute of Technology. This setup is based on a fast-gated intensified camera and detects the horizontal profiles of individual bunches in a multi-bunch environment on a single-turn base. As the radiation source point is located in a dispersive section of the storage ring, this allows time-resolved studies of the energy spread. These studies are of particular interest in the framework of short-bunch beam dynamics and the characterization of instabilities. The system is fully synchronized to other beam diagnostics devices allocated in various places along the storage ring, such as the single-shot electro-optical spectral decoding setup or the turn-by-turn terahertz detection systems. Here we discuss the results of the synchronous measurements with the various systems with special emphasis on the energy spread studies.

Slides MOOCB1 [6.514 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCB1

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB061

DAΦNE BTF Improvements of the Transverse Beam Diagnostics

software, detector, linac, positron

250

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

The DAΦNE BTF (beam-test facility) can provide electrons and positrons, tuning at runtime different beam parameters: energy (from about 50 MeV up to 750 MeV for e^- and 540 MeV for e+), intensity (from single particle up to 10¹⁰/bunch) and pulse length (in the range 1.5-40 ns) up to 49 Hz, depending on the operations of the DAΦNE collider. The beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad (downstream of the vacuum beam-pipe exit window), matching the user needs. We describe of the BTF beam transverse monitor systems based on FitPIX detectors, operating in bus synchronization mode externally timed to the BTF beam. We also describe our custom software allowing the acquisition and synchronization of the beam diagnostics with the users data, using TCP/IP calls to MEMCACHED. The performance of the system in a variety of beam intensity, energy and focusing conditions is reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB061

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB125

Post-Mortem System for the Taiwan Photon Source

kicker, operation, photon, data-acquisition

422

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

The Taiwan Photon Source (TPS), a 3-GeV third-generation synchrotron light source located in Hsinchu, is available to users since 2016. During operation, it will inevitably encounter system trips caused by beam losses. Thus, a post-mortem (PM) system is an important tool to analyze the cause of such events. Main functions of the PM system are: (i) PM trigger will be generated when the stored beam is suddenly lost abnormally; (ii) storage of relevant signals when the server receives such a trigger; (iii) PM Viewer to analyze each event and understand the cause and effect of a beam trip event. The post-mortem system architecture, plans and implementation will be discussed in this report.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB125

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPIK043

Beam-Based Waveform Measurements of the CERN PS Injection Kicker

kicker, flattop, injection, impedance

603

V. Forte, W. Bartmann, J.C.C.M. Borburgh, L.M.C. Feliciano, A. Ferrero Colomo, M.A. Fraser, T. Kramer, L. Sermeus
CERN, Geneva, Switzerland

In the framework of the LHC Injectors Upgrade (LIU) project, a beam-based technique has been developed for measuring the waveform the CERN Proton Synchrotron (PS) horizontal injection kicker, named KFA45. The technique avoids the need for tedious magnetic measurements, especially when a spare magnet is presently unavailable and measuring the operational magnet with a magnetic field probe is complicated by integration reasons. In this paper, the technique and results of the waveform measurements are summarised. The results already provide additional information in terms of waveform characterisation for the validation of numerical simulations and are of great interest for the future LIU performance upgrade.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK043

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB038

Electron Acceleration With a Ultrafast Gun Driven by Single-Cycle Terahertz Pulses

electron, gun, acceleration, laser

1406

C. Zhou, F. Ahr, A-L. Calendron, H. Cankaya, M. Fakhari, A. Fallahi, F.X. Kärtner, N.H. Matlis, W. Qiao, X. Wu, D. Zhang
CFEL, Hamburg, Germany
R.W. Aßmann, U. Dorda, K. Galaydych, B. Marchetti, G. Vashchenko, T. Vinatier
DESY, Hamburg, Germany

Funding: This work was supported by the European Research Council under the European Union Seventh Framework Program (FP/2007-2013)/ERC Grant Agreement no. 609920.
We present results on an improved THz-driven electron gun using transversely-incident single-cycle THz pulses using a horn-coupler. Intrinsic synchronization between the electrons and the driving field was achieved by using a single laser system to create electrons by UV photoemission and to create THz radiation by difference frequency generation in a tilted-pulse front geometry. Details of the optical setups for the UV and THz pulses will be described as well as preliminary results showing evidence of electron acceleration.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB038

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK078

Machine Protection Risk Management of the ESS Target System

target, proton, cryogenics, operation

1876

R. Andersson, E. Bargalló, L.S. Emås, J. Harborn, A. Lundgren, U. Odén, J. Ringnér, K. Sjögreen
ESS, Lund, Sweden

The European Spallation Source target system is, together with the proton linac, the main component in the spallation process. ESS will use a 4-ton, helium-cooled, rotating tungsten target for this purpose, and its protection and availability is paramount to the success of ESS. High demands are placed on all of the target equipment, including cooling, movement, rotation, and timing, in order to reach the facility-wide 95% availability goal for neutron production. Machine protection has defined a set of protection functions that are to be implemented for the target system. This paper describes the development of these protection functions through the use of classic HAZOPs combined with modern safety standard lifecycle management. The implementation of these functions is carried out through close collaboration between the target system owners and the machine protection group at ESS.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK078

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK079

Development and Status of Protection Functions for the Normal Conducting LINAC at ESS

linac, vacuum, proton, monitoring

1880

R. Andersson, E. Bargalló, S. Kövecses, A. Nordt, M. Zaera-Sanz
ESS, Lund, Sweden
C. Hilbes, M. Rejzek
ZHAW, Winterthur, Switzerland

The European Spallation Source faces a great challenge in succeeding with its ambitious availability goals. The aim is to construct a machine that allows for 95% availability for neutron beam production. This goal requires a robust protection system that allows for high availability by continuously monitoring and acting on the machine states, in order to avoid long facility downtimes and optimize the operation at any stage. The normal conducting section consists of the first 48 meters of the machine, and performs the initial acceleration, bunching, steering, and focusing of the beam, which sets it up for optimal transition into the superconducting section. Through a fit-for-purpose risk management process, a set of protection functions has been identified. The risk identification, analysis, and treatment were done in compliance with modern safety and ISO standards. This ensures that the risks, in this case downtime and equipment damage, are properly prevented and mitigated. This paper describes this process of defining the protection functions for the normal conducting linac at ESS.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK079

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA007

Impact of LHC and SPS Injection Kicker Rise Times on Lhc Filling Schemes and Luminosity Reach

injection, kicker, emittance, luminosity

2043

W. Bartmann, M.J. Barnes, J. Boyd, E. Carlier, A. Chmielinska, B. Goddard, G. Kotzian, C. Schwick, L.S. Stoel, D. Valuch, F.M. Velotti, V. Vlachodimitropoulos, C. Wiesner
CERN, Geneva, Switzerland

The 2016 LHC proton filling schemes generally used a spacing between injections of batches of bunches into SPS and LHC corresponding to the design report specification for the SPS and LHC injection kicker rise times, respectively. A reduction of the batch spacing can be directly used to increase luminosity without detrimental effects on beam stability, and with no increase in the number of events per crossing seen by the experiments. Measurements and simulations were performed in SPS and LHC to understand if a shorter injection kicker rise time and associated tighter batch spacing would lead to increased injection oscillations of the first and last bunches of a bunch train and eventually also a systematic growth of the transverse emittance. The results were used to define the minimum possible batch spacing for an acceptable emittance growth in LHC, with gains of reductions of about 10% possible in both machines. The results are discussed, including the potential improvement of the LHC luminosity for different filling schemes.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA007

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA149

AGS Polarized Proton Operation Experience in RHIC Run17

emittance, booster, polarization, proton

2452

H. Huang, P. Adams, J. Beebe-Wang, M. Blaskiewicz, K.A. Brown, C.J. Gardner, C.E. Harper, C. Liu, F. Méot, J. Morris, A. Poblaguev, V.H. Ranjbar, D. Raparia, T. Roser, V. Schoefer, S. Tepikian, N. Tsoupas, K. Yip, A. Zelenski, K. Zeno
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 Alternating Gradient Synchrotron (AGS). The relatively weak but numerous horizontal resonances are overcome by a pair of horizontal tune jump quads. 70% proton polarization has been achieved for 2·10¹¹ intensity. Further gain can come from maintaining smaller transverse emittance with same beam intensity. The main efforts now are to reduce the transverse emittance in the AGS and Booster, as well as robust jump quads timing generation scheme. This paper summarizes the operation results in the injectors.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA149

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB007

Pseudo Single Bunch Qualities Added to Short Pulse Operation of BESSY II

experiment, synchrotron, operation, radiation

2574

R. Müller, T. Birke, F. Falkenstern, K. Holldack, A. Jankowiak, M. Ries, A. Schälicke
HZB, Berlin, Germany

Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
BESSY II features sophisticated filling patterns as well as manipulation and separation techniques of custom bunches to serve both timing and photon hungry experiments at the same time*. Recently, the low alpha operation mode, providing bunch lengths as short as 2 ps, was extended by pseudo single bunch options. A robust technique to excite one bunch with constant displacement and enlargement was implemented for pulse picking by resonant excitation (PPRE)** users. In addition, reliable scraping of an isolated bunch to provide zero current bunch length is opening new timing opportunities. The simultaneous usage of different photon characteristics: high intensity CSR, non-bursting CSR, short duration as well as operation mode specific X-rays impose new challenges. Sensitive tune measurements and feedback mechanisms had to be developed for all three dimensions. Negative alpha is in consideration to overcome the top up efficiency constraints.
*R. Müller et.al. BESSY II Supports an Extensive Suite of Timing Experiments, IPAC16
**K. Holldack et.al. Single bunch X-ray pulses on demand from a multi-bunch SR source, Nature Comm.5, 2014

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB007

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB014

PETRA III Operation

operation, photon, experiment, optics

2589

M. Bieler, I.V. Agapov, H. Ehrlichmann, J. Keil, G.K. Sahoo, R. Wanzenberg
DESY, Hamburg, Germany

At DESY the Synchrotron Light Source PETRA III offers scientists outstanding opportunities for experiments with hard X-rays of exceptionally high brilliance since 2009. This paper describes the challenges of daily operation, including different bunch patterns and their side effects, a procedure to clear spurious bunches, the operational statistics and the main contributions to down time.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB014

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB073

First Measurements of Pulse Picking by Resonant Excitation (PPRE) at the MAX IV 3 GeV Storage Ring

emittance, storage-ring, diagnostics, feedback

2750

T. Olsson, Å. Andersson
MAX IV Laboratory, Lund University, Lund, Sweden

At synchrotron light storage rings there is demand for serving high-brilliance users requesting multibunch operation while simultaneously serving timing users who require single-bunch operation. One method to accomplish this is PPRE developed and currently in user operation at BESSY-II. In the method, the transverse emittance of one of the bunches in the bunch train is increased by an incoherent betatron excitation. Part of the light from this bunch can then be separated from the multibunch light by an aperture in the beamline, resulting in single-bunch light for the experiment. Methods such as this expand the scope of storage rings without requiring special fill patterns. This is of growing interest due to the upgrade trend towards diffraction-limited storage rings where it becomes more challenging to operate with inhomogeneous fill patterns. Measurements of PPRE were performed at the MAX IV 3 GeV storage ring utilizing the bunch-by-bunch feedback system both for excitation and as a diagnostic. Furthermore, measurements involving direct beam imaging at the diagnostics beamline allowed quantifying the effect of this excitation on the horizontal and vertical emittance.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB073

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA060

Construction of the New Kicker Magnet Systems for PF-Advanced Ring

kicker, injection, impedance, power-supply

3401

A. Ueda, S. Asaoka, T. Honda, S. Nagahashi, N. Nakamura, T. Nogami, H. Takaki, T. Uchiyama
KEK, Ibaraki, Japan

From July 2016 we are constructing a new beam transport (BT) line for the Photon Factory Advanced Ring (PF-AR). The new BT line was designed to transport the full energy 6.5-GeV beam directly from the LINAC, and the top up injection will be possible for the PF-AR. We designed and produced new kicker systems for this project. Three kicker magnets are used for the injection of the 6.5-GeV beam. The kicker magnets were designed as a window frame type ferrite core magnet. The magnetic fields of these magnets have been measured by the search coil method. We paid attention to evaluating eddy current losses of the metal coated ceramic duct in the magnetic field measurement.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA060

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA065

High Precision Magnet Powering for the SESAME Storage Ring

power-supply, controls, dipole, quadrupole

3418

S.Kh. Jafar, I.A. Abid, A. Ismail
SESAME, Allan, Jordan
E.O. Ari
ASELSAN A.S., Ankara, Turkey
M.C. Bastos, T. Henschel
CERN, Geneva, Switzerland
E.H. Yousefi
ILSF, Tehran, Iran

SESAME is the first synchrotron light source for the Middle East and is expected to start its operation mid-2017. It is composed of a 22 MeV Microtron, a 0.8 GeV booster synchrotron and a 2.5 GeV storage ring. The storage ring magnets and power supplies were designed, produced and validated under the framework of a collaboration between SESAME and CERN, supported by the European Commission. The power supply control strategy for the SESAME main ring follows the same model used in the LHC, where the power supplies are voltage sources bought from industry, to which a specially designed control unit and current sensors are added to implement a high precision current source. This strategy provides modularity, ease of maintenance, better control over performance and flexibility for the machine. Machine flexibility is further enhanced by individually powering the quadrupole magnets. In this paper, the powering strategy, design and validation of the magnet power supplies are described. Some of the challenges faced during those phases are discussed. Finally, performance results are presented, showing stability of the dipole power supply at nominal current of about 10 parts per million.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA065

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA150

New Controller for High Voltage Converter Modulator at Spallation Neutron Source

controls, LabView, interface, high-voltage

3621

D.L. Brown, X. Geng, S.W. Lee, M. Wezensky, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA

Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
We have developed a new control system for the high voltage converter modulator at the Spallation Neutron Source to replace the original control system designed by Los Alamos National Laboratory which is approaching obsolescence. The new controller, based on national instruments PXI/FlexRIO FPGA hardware, offers enhancements over the original system such as modular construction, flexibility and non-proprietary software. The new controller also provides new capabilities like modulator pulse flattening, waveform capture & first fault detection. This paper will discuss the design of the system, including the human machine interface, based on lessons learned at the Spallation Neutron Source and other projects. It will also discuss performance and other issues related to operation in an accelerator facility which requires high availability. To date half of the high voltage converter modulators have been upgraded with the new controller with the remainder scheduled for completion by mid-2017.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA150

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB061

Limiting Effects in the Double EEX Beamline

emittance, shielding, simulation, dipole

3858

G. Ha
POSTECH, Pohang, Kyungbuk, Republic of Korea
M.E. Conde, D.S. Doran, J.G. Power
ANL, Argonne, Illinois, USA

Funding: This work is supported by Department of Energy, Office of High Energy Physics, under Contract No. DE-AC02-06CH11357.
The double emittance exchange (EEX) beamline is suggested to overcome the large horizontal emittance and transverse jitter issues associated with the single EEX beamline while preserving its powerful phase-space manipulation capability. However, the double EEX beamline also has potential limitations due to coherent synchrotron radiation (CSR) and transverse jitter. The former limitation arises because double EEX uses twice as many bending magnets as single EEX which means stronger CSR effects degrading the beam quality. The latter limitation arises because a longitudinal jitter in front of the first EEX beamline is converted into a transverse jitter in the middle section (between the EEX beamlines) which can cause beam loss or beam degradation. In this paper, we numerically explore the effects of these two limitations on the emittance and beam transport.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB061

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB097

Phase Calibration of Synchrotron RF Signals

operation, cavity, synchrotron, LLRF

3945

A. Andreev, H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany
H. Klingbeil, D.E.M. Lens
GSI, Darmstadt, Germany

In the scope of FAIR's scientific program higher beam intensities will be achieved and several new synchrotrons (including storage rings) are being built. The low-level RF (LLRF) systems of FAIR have to support multi-harmonic operations, barrier bucket generation and bunch compression in order to meet the desired beam quality requirements. All this imposes several requirements on the LLRF systems. For example the phase error of the gap voltage of a specific RF cavity must be less than 3 degrees. Thus, each individual component must have a better accuracy. The RF reference signals for the FAIR synchrotron RF cavity systems are generated by direct digital synthesis (DDS). Four so-called Group DDS modules are mounted in one crate. In the supply rooms, the reference signals of such a crate are then distributed to local cavity LLRF systems. Therefore, the precise phase calibration of Group DDS modules is of importance. A phase calibration method with respect to the absolute phases of DDS modules defined by means of the FAIR Bunch Phase Timing System (BuTiS) is developed, and its precision is under evaluation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB097

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB108

Femtosecond Optical Synchronization System for the European XFEL

laser, FEL, free-electron-laser, electron

3969

C. Sydlo, M. Felber, C. Gerth, T. Kozak, T. Lamb, J.M. Müller, H. Schlarb, F. Zummack
DESY, Hamburg, Germany

Accurate timing synchronization on the femtosecond timescale is an essential installation for time-resolved experiments at free-electron lasers (FELs) such as FLASH and the upcoming European XFEL. Conventional RF timing systems suffer from RF attenuation for such long distances and have reached to date a limit for synchronization precision of around 100 femtoseconds. An optical synchronization system is used at FLASH and is based on the distribution of femtosecond laser pulses over actively stabilized optical fibers. The upcoming European XFEL has raised the demands due to its large number of stabilized optical fibers and a length of 3400 m. The increased lengths for the stabilized optical fibers necessitated major advancement in precision to achieve the requirement of less than 10 femtosecond precision. This paper reports on the status of the laser-based synchronization system at the European XFEL.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB108

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB109

Fs Level Laser-to-RF Synchronization at REGAE

laser, detector, electron, electronics

3972

M. Titberidze, M. Felber, T. Lamb, H. Schlarb, C. Sydlo
DESY, Hamburg, Germany
R.A. Loch
MPSD, Hamburg, Germany

The Relativistic Electron Gun for Atomic Exploration (REGAE) is a unique linear accelerator capable of producing ultrashort (~ 10 fs) electron bunches for studying fast processes in matter by means of ultrafast electron diffraction (UED) experiments. Additionally, REGAE is suitable for upcoming external injection experiments for laser wakefield acceleration (LWFA). In order to carry out both mentioned experiments, it is crucial to achieve fs level stability in terms of Laser-to-RF synchronization. In this paper we present an advanced laser-to-RF synchronization scheme based on integrated Mach-Zehnder modulator. The setup demonstrated the Titanium Sapphire photo-injector laser synchronization with 11 fs (rms) precision in the bandwidth up to 100 kHz. Long term timing drift measurements showed unprecedented peak-to-peak stability of 31 fs (7 fs rms) over 43 hours of measurement time. In addition, AM-PM coefficient of the MZM based laser-to-RF synchronization setup has been evaluated and showed a factor of 10 improved performance compared to conventional direct conversion based laser synchronization setup.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB109

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB110

Custom Optomechanics for the Optical Synchronization System at the European XFEL

laser, alignment, FEL, coupling

3976

F. Zummack, M. Felber, C. Gerth, T. Lamb, J.M. Müller, M. Schäfer, H. Schlarb, C. Sydlo
DESY, Hamburg, Germany

Free-electron-lasers like the upcoming European XFEL demand highly reliable optical synchronization in range of few femtoseconds. The well known optical synchronization system at FLASH had to be re-engineered to meet XFEL requirements comprising demands like ten times larger lengths and raised numbers of optically synchronized instruments. These requirements directly convert to optomechanical precision and have yielded in a specialized design accounting for economical manufacturing technologies. These efforts resulted in reduced spatial dimensions, improved optical repeatability, maintainability and even reduced production costs. To account for thermal influences the heart of the optical synchronization system is based on an optical table made out of SuperInvar. To fully exploit its excellent thermal expansion coefficient, mechanical details need to be taken into account. This work presents the design and its realization of the re-engineered optomechanical parts of the optical synchronization system, comprising mounting techniques, link stabilization units and optical delay lines for high drift suppression.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB110

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB113

Time Synchronization for Distant IOCs of the SuperKEKB Accelerators

EPICS, operation, linac, network

3982

H. Kaji, T. Naito, S. Sasaki
KEK, Ibaraki, Japan
Y. Iitsuka
EJIT, Hitachi, Ibaraki, Japan

The time synchronization for multi CPU system is always a problem to be worried. The control system of accelerator is no exception since it consists of a lot of CPUs located among large area distantly. The problem appears conspicuously when the beam is aborted. Usually, several hardware show abort signals in one beam abort event. However it is difficult to know which is the source of beam abort and which issues an abort signal under the influence of original failure. We introduce the time synchronization system of the SuperKEKB collider which choose EPICS as the control software. The system utilize Event Timing System and synchronizes the EPICS general time for I/O controllers located distantly. The accuracy of synchronization is around 10ns. It is the excellent performance in terms of synchronization of CPU time. The all abort channels of SuperKEKB are synchronized their issued time. Besides they synchronize with also the injector linac which is operated with the different control system in different network.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB113

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB118

Stabilization of Timing System Operation of J-PARC Linac and RCS

operation, linac, network, software

4000

H. Takahashi, N. Hayashi
JAEA/J-PARC, Tokai-mura, Japan
Y.I. Itoh
Total Support Systems Corporation, Tokai-mura, Naka-gun, Ibaraki, Japan
M. Kawase, Y. Sawabe
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

At the timing system for J-PARC Linac and Rapid Cycling Synchrotron (RCS), the distribution of timing information (beam tag, type, etc.) and the monitoring and control of timing system are performed via the reflective memory (RFM). The more 10 years elapsed after operation start of J-PARC. Therefore, it is concerned about the occurrence of malfunctions due to time-related deterioration of the devices of timing system. Especially, the malfunctions of a management computer to monitor and control the all timing devices and RFMs to configure the timing system data network have a significant impact. Then, the management computer was renewed and PCI-Express RFMs are installed instead of PCI RFMs. However, after renewal computer, the trouble by data corruption of RFM network was happened anew. In this paper, the contents and the results our cause investigation of data corruption and those of the measures employed for stabilizing the timing system operation are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB118

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB153

An Online Multi-Objective Optimisation Package

injection, controls, kicker, storage-ring

4092

I.P.S. Martin, M. Apollonio, R. Bartolini, M.J. Furseman
DLS, Oxfordshire, United Kingdom
R. Bartolini, G.A. Bird
JAI, Oxford, United Kingdom
D.R. Obee
Durham University, Durham, United Kingdom

The overall performance of an electron storage ring is critically dependant on a large number of variables. It can be characterised in many ways, such as by lifetime, injection efficiency, beam stability and so on. It is frequently the case however that improving one parameter comes at the cost of harming another. Equally, given the large number of variables involved in optimising the ring performance, the true, global optimum solution may be difficult to identify using simple parameter scans. In order to address this problem, a flexible optimisation tool has been developed. This tool is capable of optimising several parameters at once and can cope with an arbitrary number of variables (individually or in families). The tool is designed to be robust to measurement noise, and has been applied to a number of different optimisation problems. This paper presents an overview of the package, as well as the results of the first tests.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB153

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK096

Jitter Measurement to 10ppm Level for Pulsed RF Power Amplifiers 3 - 12GHz

operation, hardware, kicker, pulsed-power

4314

C.H. Gough, S. Dordevic, M. Paraliev
PSI, Villigen PSI, Switzerland

Linacs for FEL applications require a low jitter RF path from RF source through pulsed amplifiers, klystron / modulators and cavities. For the SwissFEL project, pulsed solid state power amplifiers of the 500W / 3us class for driving the klystrons were required. For these amplifiers, a stable and reliable interferometer system was developed to measure the residual RF jitter levels to <10 ppm (parts per million) and <10 urad (0.6mdeg) rms. This paper describes the system and gives some measurement results for 3GHz, 5.7GHz and 12GHz amplifiers.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK096

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA055

The Preliminary Performance of the Timing and Synchronization System at Tsinghua University

LLRF, laser, monitoring, controls

4565

Z.Y. Lin, Y.-C. Du, W.-H. Huang, W.-H. Huang, C.-X. Tang, C.-X. Tang, J. Yang
TUB, Beijing, People's Republic of China
J.M. Byrd, L.R. Doolittle, G. Huang, Q. Qiang, R.B. Wilcox, Y.L. Xu
LBNL, Berkeley, California, USA

A precise timing and synchronization system is developed in Tsinghua University(THU). The whole system scheme includes fiber-based CW carrier phase reference distribution system (PRDS) for delivering stabilized RF phase reference to multiple receiver clients, Low Level RF (LLRF) control system to stabilized the accelerating mi-crowave field and laser-RF synchronization system for high precise synchronization of optical and RF signals. The system test and the demonstration experiment of each subsystem are carried on to evaluate the system and the phase error jitter resources are analysed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA055

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA064

Timing System at ESS

EPICS, distributed, operation, proton

4588

J. Cereijo García, T. Korhonen, J.H. Lee, D.P. Piso
ESS, Lund, Sweden
R.R. Osorio
UDC, A Coruña, Spain

The European Spallation Source (ESS) is a research facility being built in Lund (Sweden) that will produce neutrons by the spallation process. It uses the Micro-Research Finland (MRF) Timing System, which provides a complete event-based timing distribution system. The timing signal generation consists of a basic topology: an Event Generator (EVG), an optical distribution layer (fan-out modules) and an array of Event Receivers (EVRs). The timing system will provide clock synchronization and timing services to devices with real time requirements. Its main purposes are event generation and distribution, time stamping and synchronous data transmission. The event clock frequency will be 88.0525 MHz, divided down from the bunch frequency of 352.21 MHz. An integer number of ticks of this clock will define the beam macropulse full length, around 2.86 ms, with a repetition rate of 14 Hz. ESS will be the first facility to deploy large amounts of uTCA EVRs, and is planning to take advantage of the features provided by the uTCA standard, like trigger and clock distribution over the backplane. These EVRs are already being deployed in some systems and test stands.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA064

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA095

Storage Ring Injection Kickers Alignment Optimization in NSLS-II

kicker, injection, storage-ring, operation

4683

G.M. Wang, W.X. Cheng, J. Choi, T.V. Shaftan, X. Yang
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The SR is designed to work in top-off injection mode. The injection straight includes a septum and four fast kicker magnets with independent amplitude and timing control. Ideally, fast kickers formed a local bump, which is transparent to stored beam during top off injection. Due to mismatch of kicker voltage, timing or waveform, there is residual betatron oscillation and impact normal operation. This paper will present the injection kicker waveform measurement with beam, local and global alignment optimization to in improve top off injection transition.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA095

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA104

Design of New Spectrum Data Acquisition System

interface, framework, data-acquisition, controls

4707

Z.X. Shao, H. Gao, W. Liu, C.Y. Pan
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Project supported by the National Basic Research Program of China, the National Key Scientific Instrument and Equipment Development Projects, China (2014YQ120351).
To solve the problem of spectrum acquisition in LIBS (Laser-Induced Breakdown Spectroscopy), a real-time data acquisition system was designed based on PSoC (Programmable System-On-Chip). First, the linear array CCD with electronic shutter function TCD1304DG has been used as detector .And then, the AD7621, a 16-bit analog-to-digital converter, was used to convert signal from the AFE (Analog Front End). After that, a high-integrated, low-power PSoC5LP was used as core controller, it works to complete the driver and data communication, including CCD , ADC, FIFO, the USB interface, etc. At last, a WIFI module has been added to the system for the convenience of users as well as follow-up research. The result through board-level testing indicates that the system in the spectrum acquisition is stable and accurate, and the indicators meet the LIBS project requirements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA104

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)