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

Peer reviewe

TEST RESULTS OF THE STREAMER-TUBE SYSTEM OF THE CHARM II NEUTRINO DETECTOR.

The CHARM II Collaboration is building a massive, fine-grained and low-density detector for the study of neutrino-electron scattering. Its target calorimeter consists of 441 detector planes with 155232 plastic streamer tubes with digital readout of the wires and analog readout of external pickup strips. At the time of this report, about 25% of the calorimeter planes were equipped with electronics. Results on the performance of these tubes are presented as obtained with cosmic-rays and with electron and pion beams. We have also investigated the use of water vapor as an additive to the gas to suppress coating of the anode wires. The use of water would be of particular importance when using the tubes in a high-rate environment.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Investigation of design parameters for radiation hard silicon microstrip detectors

In the context of the development of radiation hard silicon microstrip detectors for the CMS Tracker, we have investigated the dependence of interstrip and backplane capacitance as well as depletion and breakdown voltage on the design parameters and substrate characteristics of the devices. Measurements have been made for strip pitches between 60 and 240 mu m and various strip implants and metal widths, using multi-geometry devices, fabricated on wafers of either or crystal orientation, of resistivities between 1 and 6 k Omega cm and of thicknesses between 300 and 410 mu m. The effect of irradiation on properties of devices has been studied with 24 GeV/c protons up to a fluence of 4.3*10/sup 14/ cm /sup -2/. (15 refs)

Test results and conditioning procedure of a limited streamer-tube calorimeter.

The CHARM II Collaboration has built a massive, fine-grained calorimeter for the study of the elastic scattering upsilon // mu e **(** minus **) yields upsilon // mu e **(** minus **). A short description of the detector will be followed by the presentation of some results obtained by exposing 40 of the 441 planes of the calorimeter to a beam of electrons and pions. Comments will be given about the conditioning procedure followed for the 154,560 limited streamer tubes which compose the active part of the calorimeter.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

High Voltage Operation of heavily irradiated silicon microstrip detectors

We discuss the results obtained from the R&D studies, done within the CMS experiment at LHC related to the behaviour of silicon microstrip prototype detectors when they are operated at high bias voltages before and after heavy irradiation, simulating up to 10 years of LHC running conditions. We have found detectors from several manufacturesrs that are able to work at V_bias > 500 Volts before and after the irradiation procedure, maintaining an acceptable performance with S/N > 14, efficiency close to 100% and few ghost hits