Parity violation in deuteron electrodisintegration near threshold with a (0.5–4.0) GeV electron beam

1986 ◽  
Vol 33 (4) ◽  
pp. 1381-1387 ◽  
Author(s):  
W-Y. P. Hwang ◽  
T. W. Donnelly
Keyword(s):  
Electron Beam ◽  
Parity Violation ◽  
Deuteron Electrodisintegration ◽  
Near Threshold

Near-threshold study of the polarization of He resonance radiation using an energy-selected electron beam

1996 ◽  
Vol 53 (3) ◽  
pp. 1559-1566 ◽  
Author(s):  
C. Norén ◽  
J. W. McConkey ◽  
P. Hammond ◽  
K. Bartschat
Keyword(s):  
Electron Beam ◽  
Resonance Radiation ◽  
Near Threshold

scholarly journals Redesigning the Jefferson Lab Hall A beam line for high precision parity experiments

2021 ◽  
Vol 16 (12) ◽  
pp. T12007
Author(s):  
J. Benesch ◽  
Y. Roblin
Keyword(s):  
Electron Beam ◽  
Systematic Error ◽  
High Precision ◽  
Parity Violation ◽  
Beam Line ◽  
Accelerator Facility ◽  
Additional Degree ◽  
Final Configuration ◽  
Beam Delivery ◽  
Envelope Functions

Abstract The Continuous Electron Beam Accelerator Facility (CEBAF) was built with a thermionic electron source and the three original experimental hall lines reflected this. A few years after beam delivery began a parity violation experiment was approved and two polarimeters were installed in the Hall A beam line. The beam raster system was placed after the new Compton polarimeter, before one accelerator quadrupole and four quadrupoles in the new Moller polarimeter. It was very difficult to meet experimental requirements on envelope functions and raster shape with this arrangement so a sixth quadrupole was installed downstream of the Moller polarimeter to provide an additional degree of freedome. All of the parity experiments in Hall A have been run with this still-unsatisfactory configuration. The MOLLER experiment is predicated on achieving a 2% error on a 32 ppb asymmetry. Beam line changes are required to meet the systematic error budget. This paper documents the existing beam line, an interim change which can be accomplished during a annual maintenance down, and the final configuration for MOLLER and subsequent experiments.

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