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CT10 Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam
Work supported the Southeastern Universities Research Association (SURA) which operates the Thomas Jefferson National Accelerator Facility (JLAB) for the U.S. Department of Energy under contract DE-AC05-84ER40150 		instrumentation, diagnostics, synchrotron-radiation 91
 
  • C. Cuevas, J.-C. Denard, A.P. Freyberger, Y. Sharabian
    JLAB, Jefferson Lab., Virginia, USA
  Experimental Hall B at Jefferson Lab (JLAB) typically operates with CW electron beam currents in the range of 1-10 nA. This low beam current coupled with a 30 Hz flip rate of the beam helicity required the development of new devices to measure and monitor the beam charge asymmetry. We have developed four independent devices with sufficient bandwidth for readout at 30 Hz rate: a synchrotron light monitor (SLM), two backward optical transition radiation monitors (OTR) and a Faraday Cup. We present the results from the successful operation of these devices during the fall 2000 physics program. The reliability and the bandwidth of the devices allowed the control of the current asymmetry at the source laser by means of a feedback loop.