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Abstract
The CMS preshower detector contains 16 m 2 of silicon. The silicon sensors’ design is being finalized by taking into account their performance after five years of operation at high luminosity. Three detectors from different manufacturers were irradiated by neutrons and photons under bias and at low temperature. Their electrical parameters and their response to α and β particles were measured. The charge collection efficiency attains a plateau at around 300 V. The irradiation set-up and the results of the measurements are presented in this paper.
Highlights
The CMS experiment contains two end-cap preshower detectors whose main function is to provide separation
The preshower detectors consist of two thin lead converters, 2 and 1 X, each followed by silicon strip detector planes
The total area covered by silicon sensors is 16m2
Summary
The CMS experiment contains two end-cap preshower detectors whose main function is to provide separation. Full size Preshower detectors from two manufacturers were available for this study 1). They were made on n-type, floating zone (FZ), high resistivity (> : k cm) silicon. The neutron fluences and doses each detector received and the irradiation conditions are shown in table 1. A and B1, were irradiated in the Ulysse reactor in Saclay [1] at Detector B2 was irradiated at the Dubna reactor [2] at room temperature for 3 hours and without the bias voltage. Since we are only interested in the damage process in the detectors, we used silicon diodes to calibrate the 1 MeV equivalent flux of the Ulysse reactor and to cross check the calibration of the Dubna reactor. Where I is the increase of the leakage current, v is the sample’s volume, is the neutron fluence and is the damage constant
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