Abstract
The status of the Compact Solenoid Spectrometer (CMS) Resistive Plate Counter (RPC) Gas Gain Monitoring (GGM) system developed at the Frascati Laboratory of INFN (Istituto Nazionale di Fisica Nucleare) is reported. The GGM system is a cosmic ray telescope based on small RPC detectors operated with the same gas mixture used by the CMS RPC system. The GGM gain and efficiency are continuously monitored on-line, thus providing a fast and accurate determination of any shift in working point conditions. The construction details and the first result of GGM commissioning are described.
Highlights
Design parameters, construction, prototyping and preliminary commissioning results of the Compact Solenoid Spectrometer (CMS) Resistive Plate Counter (RPC) Gas Gain Monitoring (GGM) system are presented [1]
The GGM system is a cosmic ray telescope based on small RPC detectors operated with the same gas mixture used by the CMS RPC system
The operation of the CMS RPC system is strictly correlated to the ratio between the gas mixture components and to the presence of pollution due to contaminants that can be be produced inside the gaps during discharges (i.e. HF produced by SF6 or C2H2F4 molecular break-up and further fluorine recombination), accumulated in the closed-loop or by pollution that can be present in the gas piping system and flushed into the gaps by the gas flow
Summary
1) INFN Laboratori Nazionali di Frascati, Via E. 2) Universitadegli Studi di Roma ”La Sapienza”, Piazzale A. 4) INFN Sezione di Bari, Via Amendola, 173I-70126 Bari, Italy. 5) Dipartimento Interateneo di Fisica, Via Amendola, 173I-70126 Bari, Italy. 7) INFN Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, edificio 6, 80126 Napoli, Italy. 8) Universitadi Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, edificio 6, 80126 Napoli, Italy. 9) INFN Sezione di Pavia, Via Bassi 6, 27100 Pavia, Italy and Universitadegli studi di Pavia, Via Bassi 6, 27100 Pavia, Italy
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