Phys. Rev. ST Accel. Beams 6, 091001 (2003) [14 pages]Production of high brightness γ rays through backscattering of laser photons on high-energy electrons |
I. Sakai1, T. Aoki2, K. Dobashi1 *, M. Fukuda1, A. Higurashi2 †, T. Hirose1, T. Iimura3, Y. Kurihara4, T. Okugi4, T. Omori4, J. Urakawa4, M. Washio2, and K. Yokoya4
1Department of Physics, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji-shi, Tokyo 192-0397, Japan
2Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
3Faculty of Engineering, Seikei University, 3-3-1, Kichijoji-Kitamachi, Musashino-shi, Tokyo 180-8633, Japan
4KEK: High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi, Ibaraki 305-0801, Japan
Received 15 January 2002; revised 26 February 2003; published 9 September 2003
Based on the requirements from a conceptual design of a polarized positron beam for future linear colliders, we constructed a special collision system with a short focal length of 150 mm of the laser beams so as to produce γ rays through inverse Compton scattering. In order to achieve efficient laser-electron collisions, we created a special optics to produce very small e--beam sizes of σex0=7.6 μm and σey0=5.4 μm in the horizontal and vertical directions at the collision point. Using laser light with a wavelength of 532 nm and an e- beam of 1.28 GeV, provided from the ATF-damping ring at KEK, we generated 2×105 γ rays with a time duration of 26 ps in rms, leading to a peak brightness of 1.7×1018/(mrad2 mm2 0.1%bandwidth s) near to the maximum energy of 56 MeV.
©2003 The American Physical Society
URL: http://link.aps.org/abstract/PRSTAB/v6/e091001
DOI: 10.1103/PhysRevSTAB.6.091001
PACS: 52.38.Ph, 42.60.Jf, 42.62.–b, 41.75.Ht
* Present address: National Institute of Radiological Science.
† Present address: Fuji Photo Optical Co., Ltd.
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