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Title High Position Resolution BPM Readout System with Calibration Pulse Generators for KEK e⁺/e⁻ Linac
  • F. Miyahara, K. Furukawa, M. Satoh, Y. Seimiya, T. Suwada
    KEK, Ibaraki, Japan
  • R. Ichimiya
    JAEA, Aomori, Japan
  • H.S. Saotome
    Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
Abstract The KEK e⁺/e⁻ injector linac will be operated in multiple modes for the electron beam injection to 3 independent storage rings, SuperKEKB HER, Photon Factory (PF) Ring and PF-AR, and the positron beam injection into the damping ring and the SuperKEKB LER. The operation modes can be switched every 20 milliseconds. The injector linac is under upgrade for the SuperKEKB, where the required resolution of beam position measurement is less than 10 micrometer. However, the current system based on oscilloscopes for stripline beam position monitors (BPMs) has the position resolution of 50 micrometers approximately. Thus, we have developed a new BPM readout system with narrow band pass filter, 16-bit, 250 MSa/s ADCs and calibration pulse generators. The system is based on VME standard and the beam position is calculated by FPGA on board. The new system has the position resolution of 3 micrometer and wide dynamic range from 0.1 to 10 nC/bunch. The calibration pulse follows every position measurement. The calibration pulse is used for the gain correction and the integrity monitor of the cable connection. We will report details of the system.
Paper download TUPB023.PDF [0.567 MB / 4 pages]
Conference IBIC2015, Melbourne, Australia
Series International Beam Instrumentation Conference (4th)
Proceedings Link to full IBIC2015 Proccedings
Session Poster Session 2
Date 15-Sep-15   16:00–18:00
Main Classification BPMs and Beam Stability
Keywords linac, operation, emittance, data-acquisition, EPICS
Publisher JACoW, Geneva, Switzerland
Editors Mark Boland (SLSA, Clayton, Australia); David Button (ANSTO, Menai, Australia); Kathleen Riches (SLSA, Clayton, Australia); Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN 978-3-95450-176-2
Published January 2016
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