Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam

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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 ... continued below

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Denard, Jean-Claude; Freyberger, Arne P. & Sharabian, Youri May 1, 2001.

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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.

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6 Kilobytes pages

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  • 5th European Workshop on Diagnostics and Beam Instrumentation- DIPAC, 2001, Grenoble (FR), 05/13/2001--05/15/2001

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  • Report No.: JLAB-ACT-01-03
  • Report No.: DOE/ER/40150-1890
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 783675
  • Archival Resource Key: ark:/67531/metadc723669

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 7:52 p.m.

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Denard, Jean-Claude; Freyberger, Arne P. & Sharabian, Youri. Beam Charge Asymmetry Monitors for Low Intensity Continuous Electron Beam, article, May 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc723669/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.