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Title: Unique electron polarimeter analyzing power comparison and precision spin-based energy measurement

Abstract

Precision measurements of the relative analyzing powers of five electron beam polarimeters, based on Compton, Moller, and Mott scattering, have been performed using the CEBAF accelerator at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). A Wien filter in the 100 keV beamline of the injector was used to vary the electron spin orientation exiting the injector. High statistical precision measurements of the scattering asymmetry as a function of the spin orientation were made with each polarimeter. Since each polarimeter receives beam with the same magnitude of polarization, these asymmetry measurements permit a high statistical precision comparison of the relative analyzing powers of the five polarimeters. This is the first time a precise comparison of the analyzing powers of Compton, Moller, and Mott scattering polarimeters has been made. Statistically significant disagreements among the values of the beam polarization calculated from the asymmetry measurements made with each polarimeter reveal either errors in the values of the analyzing power, or failure to correctly include all systematic effects. The measurements reported here represent a first step toward understanding the systematic effects of these electron polarimeters. Such studies are necessary to realize high absolute accuracy (ca. 1%) electron polarization measurements, as required for somemore » parity violation measurements planned at Jefferson Laboratory. Finally, a comparison of the value of the spin orientation exiting the injector that provides maximum longitudinal polarization in each experimental hall leads to an independent and very precise (better than 10-4) absolute measurement of the final electron beam energy.« less

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
822192
Report Number(s):
JLAB-ACO-04-11; DOE/ER/40150-2615
TRN: US0401190
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Journal Article
Resource Relation:
Other Information: No journal information given for this preprint; PBD: 1 Mar 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCURACY; ASYMMETRY; CEBAF ACCELERATOR; ELECTRON BEAMS; ELECTRONS; MOTT SCATTERING; PARITY; POLARIMETERS; POLARIZATION; POLARIZATION-ASYMMETRY RATIO; SCATTERING; SPIN ORIENTATION

Citation Formats

Grames, Joseph, Sinclair, Charles, Mitchell, Joseph, Chudakov, Eugene, Fenker, Howard, Freyberger, Arne, Higinbotham, Douglas, Poelker, B, Steigerwald, Michael, Tiefenback, Michael, Cavata, Christian, Escoffier, Stephanie, Marie, Frederic, Pussieux, Thierry, Vernin, Pascal, Danagoulian, Samuel, Dharmawardane, Kahanawita, Fatemi, Renee, Joo, Kyungseon, Zeier, Markus, Gorbenko, Viktor, Nasseripour, Rakhsha, Raue, Brian, Suleiman, Riad, and Zihlmann, Benedikt. Unique electron polarimeter analyzing power comparison and precision spin-based energy measurement. United States: N. p., 2004. Web.
Grames, Joseph, Sinclair, Charles, Mitchell, Joseph, Chudakov, Eugene, Fenker, Howard, Freyberger, Arne, Higinbotham, Douglas, Poelker, B, Steigerwald, Michael, Tiefenback, Michael, Cavata, Christian, Escoffier, Stephanie, Marie, Frederic, Pussieux, Thierry, Vernin, Pascal, Danagoulian, Samuel, Dharmawardane, Kahanawita, Fatemi, Renee, Joo, Kyungseon, Zeier, Markus, Gorbenko, Viktor, Nasseripour, Rakhsha, Raue, Brian, Suleiman, Riad, & Zihlmann, Benedikt. Unique electron polarimeter analyzing power comparison and precision spin-based energy measurement. United States.
Grames, Joseph, Sinclair, Charles, Mitchell, Joseph, Chudakov, Eugene, Fenker, Howard, Freyberger, Arne, Higinbotham, Douglas, Poelker, B, Steigerwald, Michael, Tiefenback, Michael, Cavata, Christian, Escoffier, Stephanie, Marie, Frederic, Pussieux, Thierry, Vernin, Pascal, Danagoulian, Samuel, Dharmawardane, Kahanawita, Fatemi, Renee, Joo, Kyungseon, Zeier, Markus, Gorbenko, Viktor, Nasseripour, Rakhsha, Raue, Brian, Suleiman, Riad, and Zihlmann, Benedikt. Mon . "Unique electron polarimeter analyzing power comparison and precision spin-based energy measurement". United States. https://www.osti.gov/servlets/purl/822192.
@article{osti_822192,
title = {Unique electron polarimeter analyzing power comparison and precision spin-based energy measurement},
author = {Grames, Joseph and Sinclair, Charles and Mitchell, Joseph and Chudakov, Eugene and Fenker, Howard and Freyberger, Arne and Higinbotham, Douglas and Poelker, B and Steigerwald, Michael and Tiefenback, Michael and Cavata, Christian and Escoffier, Stephanie and Marie, Frederic and Pussieux, Thierry and Vernin, Pascal and Danagoulian, Samuel and Dharmawardane, Kahanawita and Fatemi, Renee and Joo, Kyungseon and Zeier, Markus and Gorbenko, Viktor and Nasseripour, Rakhsha and Raue, Brian and Suleiman, Riad and Zihlmann, Benedikt},
abstractNote = {Precision measurements of the relative analyzing powers of five electron beam polarimeters, based on Compton, Moller, and Mott scattering, have been performed using the CEBAF accelerator at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). A Wien filter in the 100 keV beamline of the injector was used to vary the electron spin orientation exiting the injector. High statistical precision measurements of the scattering asymmetry as a function of the spin orientation were made with each polarimeter. Since each polarimeter receives beam with the same magnitude of polarization, these asymmetry measurements permit a high statistical precision comparison of the relative analyzing powers of the five polarimeters. This is the first time a precise comparison of the analyzing powers of Compton, Moller, and Mott scattering polarimeters has been made. Statistically significant disagreements among the values of the beam polarization calculated from the asymmetry measurements made with each polarimeter reveal either errors in the values of the analyzing power, or failure to correctly include all systematic effects. The measurements reported here represent a first step toward understanding the systematic effects of these electron polarimeters. Such studies are necessary to realize high absolute accuracy (ca. 1%) electron polarization measurements, as required for some parity violation measurements planned at Jefferson Laboratory. Finally, a comparison of the value of the spin orientation exiting the injector that provides maximum longitudinal polarization in each experimental hall leads to an independent and very precise (better than 10-4) absolute measurement of the final electron beam energy.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {3}
}