NDLI: Helicity-correlated systematics for SLAC Experiment E158

Content Provider	IEEE Xplore Digital Library
Author	Mastromarino, P. Humensky, T.B. Anthony, P. Arroyo, C. Bega, K. Brachmann, A. Cates, G. Clendenin, J. Decker, F.-J. Fieguth, T. Hughes, E. Jones, G.M. Kolomensky, Y. Kumar, K. Relyea, D. Rock, S. Saxton, O. Szalata, Z. Turner, J. Woods, M.
Copyright Year	2002
Description	Author affiliation: Dept. of Phys., California Inst. of Technol., Pasadena, CA, USA (Mastromarino, P.)
Abstract	Experiment E158 at SLAC will make the first measurement of parity violation in Moller scattering. The left-right cross-section asymmetry in the elastic scattering of a 45 GeV polarized electron beam with unpolarized electrons in a liquid hydrogen target will be measured to an accuracy of better than 10/sup -8/, with the expected Standard Model asymmetry being approximately 10/sup -7/. Because helicity-correlated (left-right) charge and position asymmetries in the electron beam can give rise to systematic errors in the measurement, great care must be given to beam monitoring and control. We have developed beam current monitors that measure the charge per pulse at the 3 /spl times/ 10/sup -5/ level and RF cavity beam position monitors that measure the position per pulse to 1 /spl mu/m, which should allow precisions of 1 ppb and 1 nm for the final integrated charge and position asymmetries, respectively. In addition, since most helicity-correlated systematics in the electron beam can be traced back to the laser that drives the photoemission from the GaAs source cathode, we first use careful control of laser beam polarization, point-to-point imaging, and other techniques to minimize systematics. We also provide the capability of modulating in a helicity-correlated way the laser beam's intensity and position as it strikes the photocathode, allowing the implementation of active feedback to ensure that the average charge and position asymmetries integrate close to zero over the course of the experiment. We present this system of precision beam monitoring and control and report on its performance during a recent commissioning run, T-437 at SLAC, which demonstrated charge and position asymmetry precision of 2 ppb and 12 nm, respectively.
Starting Page	674
Ending Page	680
File Size	602608
Page Count	7
File Format	PDF
ISBN	0780373243
ISSN	10823654
DOI	10.1109/NSSMIC.2001.1009650
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Systematics Electron beams Pulse measurements Laser beams Current measurement Charge measurement Position measurement Control systems Laser feedback Scattering
Content Type	Text
Resource Type	Article

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