Keyword: distributed
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MOPRO002 The Momentum Distribution of the Decelerated Drive Beam in CLIC and in the Two-beam Test Stand at CTF3 emittance, simulation, operation, controls 62
 
  • Ch. Borgmann, M. Jacewicz, J. Ögren, M. Olvegård, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  
  We present analytical calculations of the momentum spectrum of the drive beam in CLIC and the CLIC Test Facility CTF3 after part of its kinetic energy is converted to microwaves for the acceleration of the main beam. The resulting expressions are used to determine parameters of the power conversion process in the Power Extraction Structure (PETS) installed in the Two-beam Test Stand in CTF3.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO002  
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TUPRI024 Simulation of Space Charge Dynamics on HPC space-charge, simulation, GPU, controls 1609
 
  • N.V. Kulabukhova, S.N. Andrianov
    St. Petersburg State University, St. Petersburg, Russia
  • A. Bogdanov, A. Degtyarev
    Saint Petersburg State University, Saint Petersburg, Russia
  
  To represent the space charge forces of beam a software based on analytical models for space charge distributions was developed. Special algorithm for predictor-corrector method for beam map evaluation scheme including the space charge forces were used. This method allows us to evaluate the map along the reference trajectory and to analyze beam envelope dynamics. In three dimensional models the number of computing resources we use is significant. For this purpose graphical processors are used. This software is a part of Virtual Accelerator concept which is considered as a set of services and tools of modeling beam dynamics in accelerators on distributed computing resources.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI024  
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TUPRI114 Performance of the TPS RF Reference Distribution Links timing, booster, 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI114  
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WEPME068 Mitigating Noise Sources in MTCA.4 Electronics for High Precision Measurements coupling, instrumentation, FPGA, simulation 2436
 
  • U. Mavrič, M. Hoffmann, F. Ludwig, H. Schlarb
    DESY, Hamburg, Germany
  
  The RF field detection instrumentation plays a crucial role in modern accelerator performance. The most critical section is the transition from the analog signal processing to the digitalization. In this paper we present state of the art performance of COTS components and limitations imposed by crate-oriented solutions. We give recipes on how to optimize performance and present some of the recent results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME068  
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WEPME069 Performance of a Compact LLRF System using Analog RF Backplane in MTCA.4 Crates controls, LLRF, operation, timing 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.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME069  
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THPRO078 Time-dependent Behaviour of Gas Ejected from an Accelerating Structure after a Discharge vacuum, injection, HOM, damping 3062
 
  • V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  
  Funding: This work is supported by the 7th European Framework program EuCARD under grant number 227579.
A discharge or RF-breakdown event in a CLIC acceleration structure causes the localized release of gas molecules inside a thin conduction limited system with distributed pumping. We discuss the transient behavior of such a system in the molecular flow regime that allows an analytical solution with the help of Greens functions. They describe the temporal evolution of the gas density and the gas flow ejected from the ends of thin pipes of finite length. Distributed pumping, for example through the HOM damping slits is taken into account. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO078  
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THPRO101 Setup of a History Storage Engine based on Hypertable at ELSA database, controls, interface, operation 3128
 
  • D. Proft, F. Frommberger, W. Hillert
    ELSA, Bonn, Germany
  
  The electron stretcher facility ELSA serves external hadron physics experiments with a beam of unpolarized and polarized electrons of up to 3.2 GeV energy. Its in house developed control system is able to provide real time beam diagnostics as well as steering tasks in one homogeneous environment. The existing archive engine, a simple application logging parameter changes to a file storage, was unable to cope with the rising amount of parameter updates per second. Therefore a new storage system based on the non-relational database system hypertable has been introduced. It is capable of storing huge amounts of data to distributed storage systems, thus being able to handle the recording of every parameter change at any given time. The data can be read back with low latency to a newly developed graphical data browser using a C++ interface. This contribution will give details on the setup and performance of the history storage engine on top of hypertable.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO101  
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