TY - JOUR
T1 - Drift velocity in n-pentane mixtures and its influence on timing properties of thin gap chambers
AU - Lazic, D.
AU - Lupu, N.
AU - Mincer, A.
AU - Rozen, Y.
AU - Tarem, S.
AU - Breskin, A.
AU - Chechik, R.
AU - Lellouch, D.
AU - Malamud, G.
AU - Mikenberg, G.
AU - Nagai, K.
AU - Pansky, A.
AU - Shoa, M.
N1 - Funding Information:
The reported measurements were made possible by the funding from the Israel Ministry of Research and Israel Academy of Sciences, the Israel Council of Higher Education and the Lady Davis Fellowship Trust. The numerous discussions with R. Veenhof, the author of GARFIELD program package were very fruitful.
PY - 1998/6/11
Y1 - 1998/6/11
N2 - We report on the measurements of the electron drift velocity and longitudinal diffusion in n-pentane gas mixtures and on the effect of the drift velocity on the timing properties of Thin Gap Chambers. Gas mixtures of n-pentane-CO2, n-pentane-CO2-CH4, and n-pentane-CO2-CF4 were investigated. An increase of the drift velocity has been observed with mixtures containing CF4, while still maintaining the very high, saturated gain, typical for these chambers. The overall improvement of TGC timing properties is such that 99% detection efficiency can be reached within a 20 ns gate. A simulation of the chamber timing properties using the measured drift velocities, reproduces well the measured data and can be used to predict chamber performance as a function of geometry and gas mixture.
AB - We report on the measurements of the electron drift velocity and longitudinal diffusion in n-pentane gas mixtures and on the effect of the drift velocity on the timing properties of Thin Gap Chambers. Gas mixtures of n-pentane-CO2, n-pentane-CO2-CH4, and n-pentane-CO2-CF4 were investigated. An increase of the drift velocity has been observed with mixtures containing CF4, while still maintaining the very high, saturated gain, typical for these chambers. The overall improvement of TGC timing properties is such that 99% detection efficiency can be reached within a 20 ns gate. A simulation of the chamber timing properties using the measured drift velocities, reproduces well the measured data and can be used to predict chamber performance as a function of geometry and gas mixture.
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U2 - 10.1016/S0168-9002(98)00225-3
DO - 10.1016/S0168-9002(98)00225-3
M3 - Article
AN - SCOPUS:0032098736
SN - 0168-9002
VL - 410
SP - 159
EP - 165
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2
ER -