Experimental investigation of photon multiplicity and radiation cooling for 150 GeV electrons/positrons traversing diamond and Si crystals

K. Kirsebom, R. Medenwaldt, U. Mikkelsen, S. P. Møller, K. Paludan, E. Uggerhøj*, T. Worm, K. Elsener, S. Ballestrero, P. Sona, J. Romano, S. H. Cornell, J. P.F. Sellschop, R. O. Avakian, A. E. Avetisian, S. P. Taroian

*Corresponding author for this work

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Abstract

Detailed experimental investigations of photon multiplicities for 150 GeV electrons/positrons traversing thin diamond and Si crystals have been performed. Along axial directions up to 10 photons are emitted in 1.5 mm diamond for a radiative energy loss larger than 4 GeV. This corresponds to a mean free path for photon emission of about two orders of magnitude shorter than in an amorphous target. This is in agreement with an enhanced radiative energy loss of ∼30 times that in amorphous targets. The strongly enhanced photon emission leads to radiation cooling which can result in particles exiting the crystal with a reduced angle to the axis. For incidences along planar directions the average multiplicity is still above one, even for the thinnest crystals used in the present experiment, so a single-photon spectrum can only be obtained for thicknesses ≤50 μm, which, on the other hand, is comparable to the coherence lengths for GeV photons, leading to destruction of the coherent effects.

Original languageEnglish
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume119
Issue1-2
Pages (from-to)79-95
Number of pages17
ISSN0168-583X
DOIs
Publication statusPublished - Oct 1996

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