Measurement of electron beam polarization from the energy asymmetry of Compton scattered photons
- Stanford Linear Accelerator Center, CA (United States)
- Univ. of Oregon, Eugene, OR (United States). Physics Dept.
The authors describe a new method for precision measurement ({approximately} 1%) of the longitudinal polarization of high-energy electron beams. The method relies on measuring the energy asymmetry of Compton scattered photons which result from collisions between the electron beam and a polarized laser beam. The measurement takes place near the electron-positron interaction point at the SLAC Linear Collider (SLC). The detector described here (PGC) is a threshold gas Cherenkov device which follows a lead radiator. The Cherenkov threshold (14 MeV) is essential for eliminating enormous synchrotron radiation-induced backgrounds at the position of interest in the SLC. They also describe the calibration of the PGC energy response in a test beam and its performance as a working polarimeter for the SLC/SLD physics program. Preliminary results from the 1996 run indicate that PGC measurement with total error at or below the 1% level is indeed achievable, and hence serves as a valuable crosscheck of the polarization scale.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-96ER40969; AC03-76SF00515
- OSTI ID:
- 624200
- Report Number(s):
- CONF-971147-; ISSN 0018-9499; TRN: 98:006453
- Journal Information:
- IEEE Transactions on Nuclear Science, Vol. 45, Issue 3Pt1; Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Albuquerque, NM (United States), 11-13 Nov 1997; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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