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Title: Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam

Abstract

Experimental Hall B at Jefferson Lab 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. Photomultipliers operating in current mode provided the readout of the light from the SLM and the OTRs, while high bandwidth electronics provided the readout from the Faraday cup. Using {approximately}6 helicity pairs, we measured the beam charge asymmetry to a statistically accuracy which is better than 0.05%. 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 us to control the gain on the source laser by means of a feedback loop.

Authors:
; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
783675
Report Number(s):
JLAB-ACT-01-03; DOE/ER/40150-1890
TRN: US0104057
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: 5th European Workshop on Diagnostics and Beam Instrumentation- DIPAC, 2001, Grenoble (FR), 05/13/2001--05/15/2001; Other Information: PBD: 1 May 2001
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ASYMMETRY; BEAM CURRENTS; ELECTRON BEAMS; FARADAY CUPS; HELICITY; BEAM MONITORS; PHOTOMULTIPLIERS; TRANSITION RADIATION; CEBAF ACCELERATOR; ACCELERATOR FACILITIES; PERFORMANCE

Citation Formats

Denard, Jean-Claude, Freyberger, Arne P, and Sharabian, Youri. Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam. United States: N. p., 2001. Web.
Denard, Jean-Claude, Freyberger, Arne P, & Sharabian, Youri. Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam. United States.
Denard, Jean-Claude, Freyberger, Arne P, and Sharabian, Youri. 2001. "Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam". United States. https://www.osti.gov/servlets/purl/783675.
@article{osti_783675,
title = {Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam},
author = {Denard, Jean-Claude and Freyberger, Arne P and Sharabian, Youri},
abstractNote = {Experimental Hall B at Jefferson Lab 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. Photomultipliers operating in current mode provided the readout of the light from the SLM and the OTRs, while high bandwidth electronics provided the readout from the Faraday cup. Using {approximately}6 helicity pairs, we measured the beam charge asymmetry to a statistically accuracy which is better than 0.05%. 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 us to control the gain on the source laser by means of a feedback loop.},
doi = {},
url = {https://www.osti.gov/biblio/783675}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2001},
month = {Tue May 01 00:00:00 EDT 2001}
}

Conference:
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