[en] Short communication

[en] The CMS Tracker is the world's largest silicon detector. It has only recently been moved underground and installed in the 4 T solenoid. Prior to this there has been an intensive testing on the surface, which confirms that the detector system fully meets the design specifications. Irradiation studies with the sensor material shows that the system will survive for at least 10 years in the harsh radiation environment prevailing within the Tracker volume. The planning phase for SLHC as the successor of LHC, with a 10 times higher luminosity at the same energy has already begun. First R and D studies for more robust detector materials and a new Tracker layout have started.

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[en] Published in summary form only

[en] A large part of the inner tracker of CMS will be equipped with micro strip gas Chambers (MSGCs). In addition to a high MIP rate these detectors also will be exposed to highly ionizing particles (HIP), as well as to a considerable flux of low-energy neutrons. We have performed experiments with neutrons in the energy range of 0.3-2 MeV, which covers the main part of the neutron spectrum prevailing within the CMS tracker volume. By means of time-of-flight a clear discrimination of the detector response to photons and neutrons has been achieved. The most probable neutron energy deposit has been found to be equivalent to 30 MIPs with a conversion probability of ε = 10^-5. Two MSGCs, one based on bare glass and another on diamond-like coated glass, were irradiated with neutrons at high dose (4 x 10⁷ n/cm² s). After an integral dose of 1 x 10¹³ n/cm², equivalent to one LHC-year, no indication of damage could be found. (author)

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No abstract available