Transport phenomena in point-plane geometry in liquid argon

In this paper, indirect measurements of charge-carrier mobilities in liquid argon are reported using space charge limited current. For a point anode, our values correspond to ionic mobilities measured by time-of-flight methods. For a point cathode, the influence of impurity level is very important. In the purest samples of liquid Ar, the highest negative mobility saturates to 2 cm/sup -2//Vs and this seems to be a problem of transport of energetic electrons and not of purity level. This assumption must be confirmed by trying to improve our purification setup.