We have irradiated liquid argon ionization chambers with betas using high-activity Strontium-90 sources. The radiation environment is comparable to that in the liquid argon calorimeters which are part of the ATLAS detector installed at CERN's Large Hadron Collider. We measure the ionization current over a wide range of applied potential for two different source activities and for three different chamber gaps. These studies provide operating experience at exceptionally high ionization rates. We can operate these chambers either in the normal mode or in the space-charge limited regime and thereby determine the transition point between the two. From the transition point we indirectly extract the positive argon ion mobility.
|Original language||English (US)|
|Journal||Journal of Physics: Conference Series|
|State||Published - 2012|
|Event||15th International Conference on Calorimetry in High Energy Physics, CALOR 2012 - Santa Fe, NM, United States|
Duration: Jun 4 2012 → Jun 8 2012
ASJC Scopus subject areas
- Physics and Astronomy(all)