Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry

Abstract

A major advance in accurate electron beam polarization measurement has been achieved at Jlab Hall A with a Compton polarimeter based on a Fabry-Perot cavity photon beam amplifier. At an electron energy of 4.6 GeV and a beam current of 40 uA, a total relative uncertainty of 1.5% is typically achieved within 40 min of data taking. Under the same conditions monitoring of the polarization is accurate at a level of 1%. These unprecedented results make Compton polarimetry an essential tool for modern parity-violation experiments, which require very accurate electron beam polarization measurements.

21 pages, 10 figures, 4 tables, submitted to Nucl. Instr. Meth. A

References in corpus (2)

• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

Cited by in corpus (15)

• Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon
• Constraints on the Nucleon Strange Form Factors at Q^2 ~ 0.1 GeV^2
• Quantum electron self-interaction in a strong laser field
• Precision Measurements of $A_1^n$ in the Deep Inelastic Regime
• Upgraded photon calorimeter with integrating readout for Hall A Compton Polarimeter at Jefferson Lab
• Measurement of the Parity-Violating Asymmetry in Electron-Deuteron Scattering in the Nucleon Resonance Region
• Precision Electron-Beam Polarimetry using Compton Scattering at 1 GeV
• Single-shot determination of spin-polarization for ultrarelativistic electron beams via nonlinear Compton scattering
• A Precision Measurement of the Neutron Twist-3 Matrix Element $d_2^n$: Probing Color Forces
• A High Precision Fabry-Perot Cavity Polarimeter at HERA
• A high-finesse Fabry-Perot cavity with a frequency-doubled green laser for precision Compton polarimetry at Jefferson Lab
• Electron beam polarimeter and energy spectrometer
• A test of local Lorentz invariance with Compton scattering asymmetry
• Ultra-High precision Compton polarimetry at 2 GeV
• Preliminary Results from Integrating Compton Photon Polarimetry in Hall A of Jefferson Lab