Abstract
An improved method for processing digital signals of the Frisch-grid ionization chamber to measure the electron drift velocity is proposed, which is based on the analysis of the cathode signal and the differentiated cathode signal. This method allows the real-time measurement eliminating the influence of electron diffusion and it is suitable for working gases with electron loss from the electronegative impurities. The electron drift velocities in gas mixtures of Ar + 9.86% CH4, Ar + 3.45% CO2, (Ar + 3.45% CO2) + x% O2 (x is less than 0.33), (Ar + 3.45% CO2) + y% Air (y is less than 2.09) have been measured, and the results are compared with existing measurements and calculations using MAGBOLTZ-11.4 code. Meanwhile, the influences of the impurities of oxygen and nitrogen on the electron drift velocity are analyzed.
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