Abstract

Modern gas detectors for detection of particles require F-based gases for optimal performance. Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. This review studies properties of potential eco-friendly gas candidate replacements.

Highlights

  • Many currently used refrigerant gases have a great impact on the environment since they either contribute largely to the greenhouse gas effect, or because they tear the ozone layer, or both

  • A large part of gas muon detectors used in High Energy Physics (HEP) operates with mixtures containing the regulated refrigerants as quenching medium in applications where excellent time resolution and avalanche operation are necessary

  • For a gas mixture to be appropriate in a gas detector, first of all it has to comply with the regulations

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Summary

Introduction

Many currently used refrigerant gases have a great impact on the environment since they either contribute largely to the greenhouse gas effect, or because they tear the ozone layer, or both. Gas detectors are wide spread for detection, tracking and triggering of charged particles such as muons in Nuclear and High Energy Physics (HEP). A large part of gas muon detectors used in HEP operates with mixtures containing the regulated refrigerants as quenching medium in applications where excellent time resolution and avalanche operation are necessary. Gas Electron Multiplier (GEM) [2] detectors operate in experiments such as CMS (Compact Muon Solenoid) at the LHC (Large Hadron Collider) with an argon/CO2 mixture [3]. Investigations into new gas mixtures have to be performed in order to keep the mixture properties while complying with the regulations. A study of transport properties of currently used gas mixtures in HEP, and evaluation of transport properties of freon-less gas mixtures, was recently published

Gas properties
Estimation of Gas Parameters
Molecules and their optimized geometries
Calculation of absorption spectrum
Estimation of the first Townsend parameter
Conclusions
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