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

T. Suwada, K. Furukawa, T. Kamitani, M. Satoh, T. Sugimura, K. Umemori, H. Okuno, R. Hamatsu, K. Yoshida, A. P. Potylitsyn, I. S. Tropin, R. Chehab

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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, 〈1 1 0〉, 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 ∼10 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.

Original languageEnglish
Pages (from-to)142-147
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume252
Issue number1
DOIs
Publication statusPublished - 1 Nov 2006

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Keywords

  • Channeling radiation
  • Coherent bremsstrahlung
  • Crystal target
  • Positron source
  • Solid-state plasma

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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