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T: Fachverband Teilchenphysik
T 66: Halbleiterdetektoren: Strahlenhärte und neue Materialien
T 66.5: Talk
Thursday, March 1, 2012, 17:45–18:00, ZHG 001
The degradation in signal of the pCVD diamond based Beam Condition Monitors at CMS due to radiation damage. — •Moritz Guthoff1,2, Wim de Boer2, Anne Dabrowski1, Richard Hall-Wilton3, and Steffen Müller1,2 — 1CERN, Geneva, Switzerland — 2Institut für Experimentelle Kernphysik (EKP), KIT, Karlsruhe, Germany — 3ESS, Lund, Sweden
The very intense and high energetic proton beam at the LHC has an extremely high damaging potential. For the accelerator a Beam Loss Monitor system is in place to detect potentially damaging particle rates using ionization chambers. Inside the CMS experiment polycrystalline CVD diamond detectors are used instead since they are much smaller, giving a comparable signal.
Although diamonds are believed to be radiation hard because of their large displacement energy and their low leakage currents, they can suffer signal loss when placed in extremely intense radiation fields.
This talk introduces the theoretical degradation of detector signal due to radiation. A method of monitoring the detector efficiency by normalizing to instantaneous luminosity and the degradation of the used diamonds due to radiation damage will be presented.