A Mott polarimeter operating at MeV electron beam energies

作者：Tioukine V^*; Aulenbacher K; Riehn E

来源：Review of Scientific Instruments, 2011, 82(3): 033303.

DOI：10.1063/1.3556593

We have developed a Mott electron polarimeter for the Mainzer microtron (MAMI) accelerator in Mainz, Germany. At beam energies ranging between 1.0 and 3.5 MeV two double focusing magnet spectrometers collect elastically backscattered electrons from gold targets. In spite of the small spectrometer acceptance, a sufficient statistical efficiency is achieved to provide very fast measurements if beam currents typical for experiments at MAMI are being used. High reproducibility is achieved, demonstrating that the results of asymmetry measurements are independent of the primary beam current in a range from 0.004 to 45 mu A at a level of <1% relative variation. Compared to low energy polarimeters of similar construction an improvement of a factor 2-3 in absolute accuracy seems possible.

• 出版日期2011-3