An electron polarimeter for CEBAF Hall C
- and others
A double-arm Moller polarimeter is presently under construction for Hall C at CEBAF. This polarimeter is to be used for all polarized electron scattering experiments in the hall. To measure the polarization (E{sub e} = 1-6 GeV) the beam is scattered from a magnetized iron foil. The magnetization is measured by a laser using the polar Kerr effect. The scattered and recoiling atomic electrons ({theta}cm =90{degrees}) are separated from the beam by two quadrupole lenses to larger laboratory angles and detected in coincidence. Each area of the detector package consists of a hodoscope and a total absorption counter. The hodoscopes, each consisting of 16 plastic scintillators, determine the location of the Moller peak and are used as an online check of the whole system. The fast coincidence between the left and right lead-glass total absorption counters ensures the presence of Moller electrons. The design goal of the polarimeter is to achieve an accuracy of the polarization measurement of order 1%, and to measure the polarization over a large range of beam intensities, 0.01 {mu}A to 100 {mu}A. The design of the polarimeter and the latest studies of the Kerr apparatus and detectors will be presented.
- OSTI ID:
- 374937
- Report Number(s):
- CONF-9304297--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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