Precision measurement of timing RPC gas mixtures with laser-beam induced electrons

The main goals of a new test facility at Helmholtz-Zentrum Dresden-Rossendorf are precision measurements of the electron drift velocity and the Townsend coefficient of gases at atmospheric pressure in the strongest ever used homogenous electrical fields and the search for new RPC gas mixtures to sub...

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Bibliographic Details
Published in:Journal of instrumentation 2014-10, Vol.9 (10), p.C10009-C10009
Main Authors: Naumann, L, Siebold, M, Kaspar, M, Kämpfer, B, Kotte, R, Garcia, A Laso, Löser, M, Schramm, U, Wüstenfeld, J
Format: Article
Language:English
Subjects:
Charge
Coefficients
Electric charge
Electron drift velocity
Gas mixtures
Mathematical models
Resistive plate chambers
Searching
Time measurements
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Summary:The main goals of a new test facility at Helmholtz-Zentrum Dresden-Rossendorf are precision measurements of the electron drift velocity and the Townsend coefficient of gases at atmospheric pressure in the strongest ever used homogenous electrical fields and the search for new RPC gas mixtures to substitute the climate harmful Freon. Picosecond UV laser pulses were focused into a sub-millimeter gas gap to initialize a defined tiny charge. These gaps are formed by electrodes of low-resistive ceramics or high-resistive float glass. The charge multiplication occurs in a strong homogeneous electric field of up to 100kV/cm. Electron-ion pairs were generated in a cylindrical micro-volume by multi-photon ionization. The laser-pulse repetition rate ranges from 1 Hz to a few kHz. The RPC time resolution has been measured for different gases. First results of the Townsend coefficient at 100kV/cm show a strong disagreement between the present measurement and Magboltz simulations for the typical timing RPC gas mixture C sub(2)F sub(4)H sub(2)/SF sub(6)/i-C sub(4)H sub(10), while the measured electron drift velocities are in a good agreement with the model predictions.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/9/10/C10009