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Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV channeling electron beams with high-bunch charges

Abstract : We have investigated quenching phenomena of channeling radiation through positron production from a silicon crystal hit by a single-bunch electron beam with high-bunch charge at the 8-GeV electron/positron injector linac. The crystal axis, left angle bracket1 1 0right-pointing angle bracket, was aligned to the electron beam with a precise goniometer, and positrons produced in the forward direction with a momentum of 20 MeV/c were detected with a magnetic spectrometer. Positron yields were measured by varying the charge in a bunch with a typical bunch length of not, vert, similar10 ps from 0.1 nC to 2 nC. The corresponding instantaneous current density ranged from 0.15 × 104 to 1.2 × 104 A/cm2. The results show that, at these current densities, the positron yield is proportional to the bunch charge within the experimental accuracy, which implies that no non-linear phenomena are observed in channeling radiation.
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http://hal.in2p3.fr/in2p3-00123973
Contributor : Sabine Starita <>
Submitted on : Thursday, January 11, 2007 - 4:18:49 PM
Last modification on : Wednesday, September 16, 2020 - 4:19:47 PM
Long-term archiving on: : Friday, September 21, 2012 - 10:01:54 AM

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LAL | CNRS | IN2P3

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T. Suwada, K. Furukawa, T. Kamitania, M. Satoh, T. Sugimura, et al.. Experimental study of positron production from a 2.55-mm-thick silicon crystal target using 8-GeV channeling electron beams with high-bunch charges. International Workshop on Relativistic Channeling and Coherent Phenomena in Strong Fields (RC2005), Jul 2005, Frascati, Italy. pp.142-147, ⟨10.1016/j.nimb.2006.04.065⟩. ⟨in2p3-00123973⟩

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