Abstract
The use of greenhouse gases (usually C2H2F4, CF4 and SF6) is sometimes necessary to achieve the required performance for some gaseous detectors. The consumption of these gases in the LHC systems is reduced by recycling the gas mixture thanks to a complex gas recirculation system. Beyond greenhouse gas consumption due to LHC systems, a considerable contribution is generated by setups used for LHC detector upgrade projects, R&D activities, detector quality assurance or longevity tests. In order to minimise this emission, a new flexible and portable gas recirculation unit has been developed. Thanks to its low price, flexibility and user-friendly operation it can be easily adapted for the different types of detector systems and set-ups.
Highlights
- RPC performances and gas quality in a closed loop gas system for the new purifiers configuration at LHC experiments M Capeans, R Guida, F Hahn et al
The gas is supplied to the system through a flow-meter (FIV-1005), which gas flow range is chosen according to the maximum gas flow needed by the gas system and the maximum recirculation fraction that the user needs to achieve
The flow-meters can be substituted with mass flow meter (MFM) or mass flow controllers (MFCs) to read or regulate the gas flow for each detector. All these upgrades can be very useful for a better control of the gas recirculation system but they have not been implemented in the basic recirculation unit to keep the system simple and cost-effective
Summary
The gas recirculation unit can be divided into several logic modules, to the LHC gas recirculation systems. Thanks to this modularity, it is possible to adapt the unit to users’ requirements. The choice of instruments and materials has been done considering the experience on the LHC gas systems, the quality-price relation and the availability on the market. In this way, even companies outside CERN can produce this gas recirculation unit by their-own.
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