Optimization of drift gases for accuracy in pressurized drift tubes

Details Optimization of drift gases for accuracy in pressurized drift tubes Optimization of drift gases for accuracy in pressurized drift tubes

2000-12-16

arxiv.org/abs/hep-ex/0012040v1

Nucl.Instrum.Meth. A474 (2001) 238-244

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 10 figures

Scientific paper

10.1016/S0168-9002(01)00889-0

Modern detectors such as ATLAS use pressurized drift tubes to minimize diffusion and achieve high coordinate accuracy. However, the coordinate accuracy depends on the exact knowledge of converting measured times into coordinates. Linear space-time relationships are best for reconstruction, but difficult to achieve in the $E \propto \frac{1}{r}$ field. Previous mixtures, which contained methane or other organic quenchers, are disfavored because of ageing problems. From our studies of nitrogen and carbon dioxide, two mixtures with only small deviations from linearity were determined and measured. Scaling laws for different pressures and magnetic fields are also given.

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