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Phys. Rev. Lett. 96, 114801 (2006) [4 pages]

Efficient Propagation of Polarization from Laser Photons to Positrons through Compton Scattering and Electron-Positron Pair Creation

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T. Omori1, M. Fukuda2, T. Hirose3, Y. Kurihara1, R. Kuroda3,4, M. Nomura2, A. Ohashi5, T. Okugi1, K. Sakaue3, T. Saito3, J. Urakawa1, M. Washio3, and I. Yamazaki3
1KEK: High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki 305-0801, Japan
2National Institute of Radiological Sciences, Chiba-shi, Chiba 263-8555, Japan
3Advanced Research Institute for Science and Engineering, Waseda University, Tokyo 169-8555, Japan
4National Institute of Advanced Industrial Science and Technology, Tsukuba-shi, Ibaraki 305-8568, Japan
5Department of Physics, Tokyo Metropolitan Univeresity, Hachioji-shi, Tokyo 192-0397, Japan

Received 10 September 2005; published 24 March 2006

We have demonstrated for the first time the production of highly polarized short-pulse positrons with a finite energy spread in accordance with a new scheme that consists of two-quantum processes, such as inverse Compton scattering and electron-positron pair creation. Using a circularly polarized laser beam of 532 nm scattered off a high-quality, 1.28 GeV electron beam, we have obtained polarized positrons with an intensity of 2×104 e+/bunch. The magnitude of positron polarization has been determined to be 73±15(stat)±19(syst)% by means of a newly designed positron polarimeter.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.114801
DOI:
10.1103/PhysRevLett.96.114801
PACS:
29.27.Hj, 41.75.Fr
 
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