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, 〈110〉, was aligned to the electron beam with a precise goniometer, and positrons produced in the forward direction with a momentum of 20MeV/c were detected with a magnetic spectrometer. Positron yields were measured by varying the charge in a bunch with a typical bunch length of ∼10ps from 0.1nC to 2nC. The corresponding instantaneous current density ranged from 0.15×104 to 1.2×104A/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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