on CMS information server CMS NOTE 1997 / 061 The Compact Muon Solenoid Experiment
The high radiation environment at the LHC will require the use of radiation hardened microelectronics for the readout of inner detectors. Two such technologies are a Harris bulk CMOS process and the DMILL mixed technology process. Transistors have been fabricated in both of these and have been tested before and after irradiation to 10 Mrads, the total dose expected in the innermost silicon microstrip layers. Several processing runs of Harris transistors have been carried out and samples from one have also been irradiated to 100 Mrads. A preamplifier-shaper circuit, to be used for readout of the CMS microstrip tracker, has been tested and the noise performance is compared with individual transistors.
Radiation Environment Simulations for the CMS Detector
This paper provides an overview of the most important radiation issues at the CMS experiment at LHC and gives a review of the simulations performed and the main results obtained with the FLUKA code during the last three years. The main emphasis is put on recent results, reported in the CMS Technical Proposal or those obtained thereafter. It is shown that for most of the CMS subdetectors proper radiation shielding is vital in order to guarantee a reliable operation and sufficient life span of the detectors. In addition new results on induced activity are presented.
Measurements of a radiation hardened process: Harris AVLSIRA
Abstract The Harris AVLSIRA process is a bulk CMOS process that has been specifically developed for use in radiation environments. It is being studied in order to assess its suitability for use in the readout electronics that are being developed for proposed future large hadronic colliders. Initial studies from one processing batch are presented.