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arXiv physics/0504195physics.ins-det
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用康普顿偏振仪精确测量JLab Hall A中的电子束偏振

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

S. Escoffier, P. Y. Bertin, M. Brossard, E. Burtin, C. Cavata, N. Colombel, C. W. de Jager, A. Delbart, D. Lhuillier, F. Marie, J. Mitchell, D. Neyret, T. Pussieux

摘要:

在Jlab Hall A用基于法布里-珀罗腔光子束放大器的康普顿偏振计实现了精确电子束偏振测量的重大进展。在4.6 GeV的电子能量和40 μ A的束流,总的相对不确定度为1.5%,通常在40分钟内取得的数据。在相同条件下,偏振监测的准确度为1%。这些前所未有的结果使康普顿偏振测量成为现代宇称违反实验的重要工具,这些实验需要非常精确的电子束偏振测量。

英文摘要:

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.

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