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A Mott polarimeter operating at MeV electron beam energies
V Tioukine1, K Aulenbacher, E Riehn
1Institut für Kernphysik der Johannes Gutenberg-Universität Mainz D-55128 Mainz, Germany. tioukine@kph.uni-mainz.de
The Review of Scientific Instruments
|April 5, 2011
Summary
A new Mott electron polarimeter was developed for the Mainzer microtron (MAMI) accelerator. This instrument enables fast, reproducible electron asymmetry measurements with improved accuracy, independent of beam current variations.
Area of Science:
- Nuclear Physics
- Particle Physics
- Accelerator Physics
Background:
- Electron scattering experiments require precise polarization measurements.
- Existing polarimeters may have limitations in speed or accuracy.
Purpose of the Study:
- To develop and characterize a Mott electron polarimeter for the MAMI accelerator.
- To assess the performance of the polarimeter in terms of efficiency, reproducibility, and accuracy.
Main Methods:
- Utilized Mott electron polarimetry with double focusing magnet spectrometers.
- Collected elastically backscattered electrons from gold targets at beam energies of 1.0–3.5 MeV.
- Measured electron asymmetry as a function of beam current.
Main Results:
- Achieved sufficient statistical efficiency for fast measurements with typical MAMI beam currents.
- Demonstrated high reproducibility, with asymmetry results independent of beam current (<1% variation) from 0.004 to 45 μA.
- Indicated a potential 2-3 times improvement in absolute accuracy compared to similar low-energy polarimeters.
Conclusions:
- The developed Mott electron polarimeter is a valuable tool for high-precision electron polarization measurements at MAMI.
- The instrument offers significant advantages in measurement speed and reproducibility.
- The polarimeter shows promise for enhanced accuracy in future electron scattering experiments.
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