Author: Hassanzadegan, H.
Paper Title Page
THPME160 Design, Implementation and Preliminary Test Results of the ESS Beam Current Monitor System 3638
 
  • H. Hassanzadegan, A. Jansson, C.A. Thomas
    ESS, Lund, Sweden
  • J.L. Crisp
    FRIB, East Lansing, Michigan, USA
  • U. Legat, K. Strniša
    Cosylab, Ljubljana, Slovenia
  • M. Werner
    DESY, Hamburg, Germany
 
  The Beam Current Monitor system of the ESS linac will be mainly based on AC Current Transformers. The BCM system will be used to monitor the beam current and charge in absolute and differential modes. The differential current measurement is also intended for detecting large and sudden beam losses and acting on the Machine Interlock System (MIS), especially in areas where Beam Loss Monitors cannot be reliably used. A demo BCM based on a Bergoz ACCT and MTCA.4 electronics has been procured and integrated into EPICS. A VHDL code has been developed and successfully tested for the required FPGA signal processing including droop compensation, filtering, DC level correction and interfacing to the MIS. This paper gives an overview of the current status of the BCM system design and implementation as well as some preliminary test results in absolute and differential modes.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME160  
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THPME166 System Overview and Current Status of the ESS Beam Position Monitors 3653
 
  • H. Hassanzadegan, A. Jansson, C.A. Thomas
    ESS, Lund, Sweden
  • D. Lipka, M. Werner
    DESY, Hamburg, Germany
  • A. Young
    SLAC, Menlo Park, California, USA
 
  It is planned to install more than 140 button BPMs along the ESS linac. The BPMs will be used to measure the beam position and phase in all foreseen beam modes and to provide input to the Machine Interlock System. The phase measurement is mainly intended for cavity tuning and Time-Of-Flight energy measurements. A customized BPM detector based on the European XFEL button style has been designed for the cold linac through a collaboration with DESY. Large buttons with diameters up to 40 mm are foreseen to provide enough S/N ratio not only with the nominal beam, but also with a low-current or a de-bunched beam. A demo MTCA.4 system has been procured and successfully integrated into EPICS. Also, a customized Rear Transition Module for down-mixing the BPM signals will be developed with SLAC. Electronics tests with a BPM test bench are currently going on at ESS. BPM installation in the linac is foreseen for 2017 and afterwards.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME166  
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