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

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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
Pages (from-to)79-95
Number of pages17
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume119
Issue number1-2
DOIs
Publication statusPublished - Oct 1996

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Kirsebom, K., Medenwaldt, R., Mikkelsen, U., Møller, S. P., Paludan, K., Uggerhøj, E., Worm, T., Elsener, K., Ballestrero, S., Sona, P., Romano, J., Cornell, S. H., Sellschop, J. P. F., Avakian, R. O., Avetisian, A. E., & Taroian, S. P. (1996). Experimental investigation of photon multiplicity and radiation cooling for 150 GeV electrons/positrons traversing diamond and Si crystals. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 119(1-2), 79-95. https://doi.org/10.1016/0168-583X(96)00277-7