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
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. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.6.091001
DOI:
10.1103/PhysRevSTAB.6.091001
PACS:
52.38.Ph, 42.60.Jf, 42.62.–b, 41.75.Ht
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