Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Instrumentation XV
HK 50.2: Vortrag
Donnerstag, 1. März 2018, 14:30–14:45, Audimax H1
Application of micron-size plasma for precision measurement of gas parameters in resistive plate chambers and drift detectors with an unique laser-driven test facility — •Xingming Fan1, Lothar Naumann1, Mathias Siebold1, Daniel Stach1, Christian Wendisch2, and Michael Wiebusch3 — 1Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 3Institut für Kernphysik, Goethe-Universität, Frankfurt, , Germany
A high precision Laser-driven detector test facility has been developed at Helmholtz-Zentrum Dresden-Rossendorf. Primary ionizaion with well-defined position, start time and electron number is created in special designed gas detector samples.
Experiments on samples of Resistive Plate Chamber (RPC) with varies gap widths is operated. Precise value of Townsend coefficient and electron drift velocity is obtained on different filed strengths. Comparison between our results and other works has shown disagreement in 100 kV/cm field, but comparible parameters in 50 kV/cm field.
Mini Drift Chamber (MDC) sample is designed representing the MDC detector with complex and inhomogeneous field design in HADES experiment. A very precise 2D and 3D drift velocity distribution is obtained for Ar/CO2 filled MDC. An individual drift tube sample allows the comparison of gas parameters, the estimation of the multiphoton ionization coefficient and the Debye length of ionization at laser focus.