CMS physics technical design report : Addendum on high density QCD with heavy ions

Peer reviewe

Characterization of neutron irradiated silicon microstrip detectors

The radiation hardness of silicon microstrip detectors has been investigated on full-size prototypes similar to the ones that will be installed in the forward tracker of CMS, where a very intense radiation environment is envisaged. Silicon detectors were exposed to a neutron beam with 3 different fluences up to 2.4*10/sup 14/ neutrons/cm/sup 2/, more than those foreseen at LHC after 10 years of operation. Degradation effects of the device properties regarding reverse current, depletion voltage, bulk and interstrip capacitance has been measured in laboratory as function of bias voltage, temperature and neutron fluence. (13 refs)

Wedge silicon detectors for the inner tracker system of CMS

One “wedge” Double Sided Silicon Detector prototype for the CMS forward inner tracker has been tested both in laboratory and on a high energy particle beam. The results obtained indicate the most reliable solutions for the strips geometry of the junction side. Three different designs of “wedge” Double Sided detectors with different solutions for the ohmic side strip geometry are presented

Performance of irradiated silicon microstrip detectors

Abstract Silicon microstrip devices to be installed in Large Hadron Collider (LHC) tracking detectors will have to operate in a high radiation environment. We report on performance studies of silicon microstrip detectors irradiated with neutrons or protons, up to fluences comparable to the first ten years of running at LHC. Obtained results show that irradiated detectors can still be operated with satisfactory signal-to-noise ratio,and in the case of inhomogeneously type inverted detector a very good position resolution is achieved regardless of the zone crossed by the particle

Erratum to : Test beam results on irradiated silicon detectors for the CMS silicon strip tracker [Nucl. Instr. and Meth. A 434(1999) 313–336]

We report the results of test beams performed at CERN using irradiated microstrip silicon detectors. The detectors were single- and double-sided devices, produced by different manufacturers and irradiated with neutrons at various fluences up to 3.6 × 10 13 n/cm 2. Signal-to-noise ratio, resolution and efficiency were studied for different values of the incidence angle, of the detector temperature and of the read-out pitch, as a function of the detector bias voltage. The goal of these tests was to optimize the design of the final prototypes for the CMS Silicon Strip Tracker