Abstract
W-value, mobility and gas gain measurements have been carried out in electronegative gaseous CS2 and CS2 with a broad range of gas mixture additives at a pressure of 40Torr making use of a single-electron proportional counter method. The experimental results have revealed that W-values obtained for CS2 (40Torr), CS2–CF4 (30–10Torr), CS2–CF4 (20–20Torr), CS2–CF4 (10–30Torr), CS2–Ne (35–5Torr) and CS2–He (35–5Torr) gas mixtures are 24.9±0.8, 25.2±0.6, 29.2±1.0, 33.0±1.0, 23.1±0.8 and 23.7±0.8eV, respectively. The average mobility was measured in all CS2 gas mixtures and was found to be slightly greater than in pure CS2. The gas gain was found to be significantly greater in CS2 gas mixtures relatively to pure CS2.
Highlights
Time Projection Chambers (TPCs) have been widely used for the last few decades.Image transport in TPCs is typically implemented with electrons with high drift velocities, ~1000 m/s, and large diffusion [1,2]
This detector consists of two back-to-back TPCs each with Multi Wire Proportional counters (MWPCs) readout providing three measurements of the range components of the tracks (Δx, Δy, Δz)
When electrons are captured on electronegative CS2, negative molecules are drifted to the anode wires of the MWPCs where the high electric field there strips off the attached electrons, which produce a normal electron avalanche
Summary
Srdoc et al, [12,13,14,15] and used to measure W-values both in noble and molecular gases. It relies on the measurements of the average pulse heights produced by single electrons (SE) and by low energy X-rays under the same experimental conditions. In this method, the ionization yield, Nion, is calculated as a ratio of a pulse height parameter X 55 Fe , which.
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