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Persistent URL http://purl.org/net/epubs/work/29605
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Record Id 29605
Title Analogue Readout and Signal Processing for Micro Strip Gas Chambers of the Compact Muon Solenoid at LHC
Abstract Future high energy colliders will give the potential to access a wide range of physics topics. The Large Hadron Collider (LHC) at CERN will collide proton bunches at a frequency of 40 MHz with a centre of mass energy of 14 TeV and a design luminosity of 10 to the 34 cm to the -2 s to the -1. Experience has shown that the apparatus used to reconstruct the trajectories of charged particles generated in collisions will play a major role in making new discoveries. The tracking detector of the CMS experiment will make use of silicon pixels, silicon microstrips and micro strip gas chambers (MSGC). It has been designed to reconstruct the trajectories of charged particles with high precision and efficiency at the beam crossing frequency of 40 MHz and in a dense radiation environment. At the highest luminosities required to explore the regions in which new physics is expected to be found, pile-up of events from several bunch crossings will become an important issue for pattern recognition and should be adequately suppressed. In order to satisfy the demands of such a hostile environment, each of the twelve million microstrip channels in the system will be equipped at the front end with an analogue amplifier, a delay buffer and a further stage of signal processing whose specific task is to minimise pile-up effects. This thesis addresses in detail the aspects of this design optimised for the readout of the gaseous detectors. The possibility of adapting the readout scheme foreseen for the silicon detector to the MSGC's is investigated by means of extensive simulations with emphasis on the analogue signal processor, and a proposal is formulated for the implementation of such a filter. Results are presented of the performance of a system which makes use for the first time of a prototype of a final front-end chip to read out a prototype gas detector conforming to the CMS specifications. The performance of the novel filter is investigated and compared with expectations from simulations.
Organisation CCLRC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Thesis RAL Theses RAL-TH-1999-012. 1999. 1999