학술논문
RECENT MEASUREMENTS WITH THE JEFFERSON LAB 5-MEV MOTT POLARIMETER
Document Type
Conference
Author
Source
Conference: 13th International Symposium On High-Energy Spin Physics (SPIN 98), Protvino (RU), 09/08/1998--09/12/1998; Other Information: In *Protvino 1998, High energy spin physics* 554-556; PBD: 1 Sep 1998
Subject
Language
English
Abstract
We report on recent experience with a 5 MeV Mott scattering polarimeter to monitor electron beam polarization in the CEBAF injector. At 5 MeV, the effective analyzing power of a 100 nm gold foil is close to the calculated single-scatter analyzing power -0.522 (at null=172.6-). Statistical uncertainties of order 1% are achieved quickly since elastic signal rates at 2 muA CW are high. Recent chamber modifications and signal electronics changes have improved signal-to-noise. Calibration work continues. A variety of measurements are feasible which affect machine operations, polarized source development and serve the facility user community.