Spin-polarization of an electro-static positron beam |
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Authors: | A Kawasuso M Maekawa |
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Institution: | Japan Atomic Energy Agency, Advanced Science Research Center, 1233, Watanuki, Takasaki, Gunma 370-1292, Japan |
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Abstract: | We constructed an electro-static positron beam apparatus. We fabricated a simple spin-polarimeter composed of a permanent magnet with a surface magnetic field of 0.65 T and an iron pole piece. The longitudinal spin-polarization of the positron beam was determined to be 0.3 by analyzing the magnetic field dependence of the Doppler broadening of annihilation radiation from a fused silica specimen. The effect of spin rotation was examined using an iron poly-crystal and a simple E × B filter. |
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Keywords: | Positron beam Spin-polarization Polarimeter |
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