A luminosity monitor for the A4 parity violation experiment at MAMI

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• 作者：T. Hammel ; P. Achenbach ; S. Baunack ; L. Capozza ; J. Diefenbach ; K. Grimm ; D. von Harrach ; Y. Imai ; E. Kabu&#xdf ; R. Kothe et al.
• 关键词：Charged-particle sources and detectors ; Charge conjugation ; parity ; time reversal ; and other discrete symmetries ; Beam characteristics ; Cherenkov detectors
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2006
• 出版时间：1 August 2006
• 年：2006
• 卷：564
• 期：1
• 页码：1-12
• 全文大小：662 K

文摘

A water Cherenkov luminosity monitor system with associated electronics has been developed for the A4 parity violation experiment at MAMI. The detector system measures the luminosity of the hydrogen target hit by the MAMI electron beam and monitors the stability of the liquid hydrogen target. Both are required for the precise study of the count rate asymmetries in the scattering of longitudinally polarized electrons on unpolarized protons. Any helicity correlated fluctuation of the target density leads to false asymmetries. The performance of the luminosity monitor, investigated in about 2000 h with electron beam, and the results of its application in the A4 experiment are presented.