06 Instrumentation, Controls, Feedback & Operational Aspects
T24 Timing and Synchronization
Paper Title Page
TUPRI079 Test Results of the Libera Sync 3 CW Reference Clock Transfer System 1751
 
  • P. Orel, E. Janezic, P.L. Lemut, S. Zorzut
    I-Tech, Solkan, Slovenia
  • S. Hunziker, V. Schlott
    PSI, Villigen PSI, Switzerland
 
  The new Libera Sync 3 CW reference clock transfer system has been specifically designed to meet the strict requirements of the latest fourth generation light sources, such as the Swiss FEL. The system has been co-developed with the Paul Scherrer Institute (PSI). It has been produced and tested at Instrumentation Technologies (I-Tech) and later installed at PSI. In this article we give a general overview of the system and its functionalities. We also present a brief overview of the supporting products that have been developed in order to enable testing at the level of performance discussed. Finally, we focus on presenting some of the test results obtained at I-Tech and PSI showing the performance capabilities and limitations of the system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI079  
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TUPRI104 A Beam Arrival Time Cavity for REGAE at DESY 1820
 
  • M. Hansli, A. Angelovski, R. Jakoby, A. Penirschke
    TU Darmstadt, Darmstadt, Germany
  • K. Flöttmann, D. Lipka, H. Schlarb, S. Vilcins
    DESY, Hamburg, Germany
  • F.J. Grüner, B. Zeitler
    CFEL, Hamburg, Germany
 
  Funding: Kindly funded by BMBF within FSP302.
REGAE (Relativistic Electron Gun for Atomic Exploration) at DESY in Hamburg is a linear accelerator for electron diffraction experiments. It is upgraded to allow for laser driven wake field accelerator experiments. The bunch length is around 10 fs and the wakefield structure is about 100 fs and the synchronization of the laser and the electron bunch needs to be in order of the bunch length. To achieve this, a RFbased scheme will be used, comparing the phase of a beam induced signal with the reference clock. To improve the performance for the operation with charges well below 1 pC a beam arrival time cavity (BAC) at 3.025 GHz is foreseen as a highly sensitive pickup. To provide the maximum energy to the measurement electronics, the cavity needs a high R=Qvalue and an optimized coupling. An over-coupled setting might be beneficial as it provides a higher signal-to-noise ratio for the first samples. In this paper the concept of the beam arrival time cavity, the influence of the dark current on the measurement and parameter studies and optimization of the cavity itself are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI104  
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TUPRI107 Compact MTCA.4 Based Laser Synchronization 1823
 
  • M. Felber, Ł. 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI107  
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TUPRI108 Development of New Tag Supply System for DAQ for SACLA User Experiments 1826
 
  • T. Abe
    RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
  • A. Amselem, K. Okada, R. Tanaka, M. Yamaga
    JASRI/SPring-8, Hyogo-ken, Japan
 
  This paper presents development of a new tag supply system for the data-acquisition (DAQ) system for SACLA user experiments. The X-ray Free-Electron Laser facility in SPring-8, SACLA, has delivered X-ray laser beams to users since March 2012 [1]. For the user experiments at SACLA, a dedicated DAQ system has been developed. The DAQ system is currently capable to operate with maximum ten sensors of multiport Charge-Coupled Device (MPCCD) for X-ray detection. The data of ten sensors are read out with individual readout modules. We implement a new tag supply system to ensure the reconstruction of the diffraction image of the user experiments. The tag data are used to synchronize the data. One master server receives a signal given by accelerator and the delivery of the tag data follows to five experimental halls at SACLA and some of monitors at SACLA accelerator. We employ dedicated communication lines to deliver the tag data. The longest distance to deliver the tag data is about one kilometer. We need to update entire softwares of DAQ system for the implementation. We will implement the new system to the DAQ system by the spring 2014.
[1] T. Ishikawa et al., "A compact X-ray free-electron laser emitting
in the sub-angstrom region", Nature Photonics 6, 540-544 (2012).
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI108  
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TUPRI109 Construction and Commissioning of Event Timing System at SuperKEKB 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.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI109  
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TUPRI113 Integration of the Timing System for TPS 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI113  
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TUPRI114 Performance of the TPS RF Reference Distribution Links 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI114  
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WEOBB01 Design and Performance of the Optical Fiber Length Stabilization System for SACLA 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 icon Slides WEOBB01 [2.673 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEOBB01  
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