Transition Radiation Detectors for Cosmic Rays near the Knee

Details Transition Radiation Detectors for Cosmic Rays near the Knee Transition Radiation Detectors for Cosmic Rays near the Knee

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2237w&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

Precise observations of the energy spectra and relative abundances of cosmic-ray nuclei require instruments that exhibit individual charge resolution and a calibrated energy response. If energies up to ˜ 1015 eV are to be covered, the low intensity of the heavier nuclei (Z ² 3) also mandates detector areas of several square meters. X-ray transition radiation detectors (TRDs) appear to provide the only practical means of fulfilling all of these requirements for balloon or space-b orne instruments. However, for measurements up to the cosmic-ray "knee", care must be taken that the energy response of the TRD does not saturate for Lorentz factors less than ˜ 105 . We have designed detectors to meet this goal, and have successfully tested prototypes at an accelerator beam at CERN. We shall present and discuss the results of these measurements.

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