Abstract
A study of ionization electron drifting long distances in liquid and solid argon was carried out with a 10 cm gridded ionization chamber, operated with electric fields between 10 V/cm and 2 kV/cm. A detailed analysis of the ionization pulse shape was performed with a FADC readout, yielding information on both the degree of purity of the liquid and the electron drift velocity. Argon with an impurity concentration less than 0.2 p.p.b. oxygen equivalent was obtained with a very simple purification system. With this level of purity electrons remained free for periods of time in excess of one millisecond. The measured attenuation length extrapolates to 7.5 m for liquid argon and to 1 m for solid argon at a drift field of 1 kV/cm.
Published Version
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