| Title |
Beam Polarization Measurements with the Revised Compton Polarimeter at ELSA |
| Authors |
- M.T. Switka, K. Desch, D. Elsner
ELSA, Bonn, Germany
- W. Hillert
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
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| Abstract |
The Compton Polarimeter at the ELSA 3.2 GeV storage ring has been designed to measure the polarization degree of the stored electron beam by analyzing the profile of the back-scattered gamma-beam with a silicon microstrip detector. Utilizing a scattering asymmetry from interaction with circularly polarized laser light, the electron beam polarization is determined from the vertical shift of the gamma-beam’s center of gravity in respect to the handedness of the laser light. The installation of a new laser source and silicon strip detector has improved the polarimeter’s performance significantly. Additionally, the profile analysis could be enhanced by using a Pearson type peak function fit. The analyzing power was determined through the observation of the Sokolov-Ternov effect and a statistical measurement accuracy of 2 % could be obtained within 5 minutes of measurement time. The polarimeter resolves the expected spin dynamical effects occurring in the storage ring and has shown to be a robust and reliable measurement system for operation with the GaAs source for polarized electrons.
|
| Paper |
download MOP37.PDF [1.109 MB / 3 pages] |
| Cite |
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| Conference |
IBIC2022 |
| Series |
International Beam Instrumentation Conference (11th) |
| Location |
Kraków, Poland |
| Date |
11-15 September 2022 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Peter Forck (GSI, Darmstadt, Germany); Adriana Wawrzyniak (SOLARIS, Kraków, Poland); Volker R.W. Schaa (GSI, Darmstadt, Germany); Grzegorz W. Kowalski (SOLARIS, Kraków, Poland); Agnieszka (SOLARIS Cudek (SOLARIS, Kraków, Poland) |
| Online ISBN |
978-3-95450-241-7 |
| Online ISSN |
2673-5350 |
| Received |
07 September 2022 |
| Revised |
09 September 2022 |
| Accepted |
13 September 2022 |
| Issue Date |
19 September 2022 |
| DOI |
doi:10.18429/JACoW-IBIC2022-MOP37 |
| Pages |
137-139 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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