Unique electron polarimeter comparison and spin-based energy measurement

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A careful intercomparison of the relative analyzing power of five electron beam polarimeters was performed at Jefferson Lab during a dedicated two day machine development period. This is the first time such a comparison between Mott, Compton, and Moller polarimeters has been made. A Wien-style spin manipulator at the injector was used to vary the spin orientation of the electron beam at each polarimeter. A series of measurements as a function of spin orientation provides determination of the relative analyzing power of each polarimeter, and more importantly, quantifies the instrumental systematics which help realize high precision absolute electron polarimetry. In ... continued below

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423 Kilobytes pages

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Grames, J.M. June 1, 2001.

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Description

A careful intercomparison of the relative analyzing power of five electron beam polarimeters was performed at Jefferson Lab during a dedicated two day machine development period. This is the first time such a comparison between Mott, Compton, and Moller polarimeters has been made. A Wien-style spin manipulator at the injector was used to vary the spin orientation of the electron beam at each polarimeter. A series of measurements as a function of spin orientation provides determination of the relative analyzing power of each polarimeter, and more importantly, quantifies the instrumental systematics which help realize high precision absolute electron polarimetry. In addition, a comparison of the value of the injector spin angle that. provides precise longitudinal beam polarization at each experimental hall leads to an independent and potentially high precision measurement (dE/E = 10-5) of the final electron beam energy. Results and discussion of the tests of the polarimeters and energy measurement will be presented.

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423 Kilobytes pages

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  • PAC 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: JLAB-ACC-01-12
  • Report No.: DOE/ER/40150-1864
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 783611
  • Archival Resource Key: ark:/67531/metadc716840

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  • June 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 8:42 p.m.

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Grames, J.M. Unique electron polarimeter comparison and spin-based energy measurement, article, June 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc716840/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.