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Comparative electron polarization measurement with a helium electron polarimeter and a high-precision Mott detector are presented. For these measurements the helium electron polarimeter was calibrated according to theory, whereas the Mott detector was calibrated independently with an improved auxiliary-target method. The comparison of the experimental results reveals various problems inherent in helium electron polarimetry, such as poor efficiency and problems occurring in precise light polarization measurements. At present, a high-precision Mott detector is therefore clearly superior to a helium polarimeter with respect to efficiency and accuracy.
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Fischer et al. (1995) studied this question.
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