TY - JOUR
T1 - Onset of space charge effects in liquid argon ionization chambers
AU - Toggerson, B.
AU - Newcomer, A.
AU - Rutherfoord, J.
AU - Walker, R. B.
N1 - Funding Information:
We would like to thank Michael Shupe, Leif Shaver, Ron Norton, Michael Starr, Eleanor Kelly, Chris Oram, David Rahm, Dan Tompkins, and Neeru Sanghi for insights, inspiration, suggestions, and help with the apparatus and/or data taking. This work is supported by the Office of High Energy Physics of the U.S. Department of Energy as part of the U.S. ATLAS Research Program.
PY - 2009/9/11
Y1 - 2009/9/11
N2 - Using a thin-gap liquid argon ionization chamber and Strontium-90 beta sources we have measured ionization currents over a wide range of gap potentials. These precision "HV plateau curves" advance the understanding of liquid argon sampling calorimeter signals, particularly at high ionization rates. The order of magnitude differences in the activities of the beta sources allow us to estimate where the ionization chamber is driven into the space-charge dominated regime.
AB - Using a thin-gap liquid argon ionization chamber and Strontium-90 beta sources we have measured ionization currents over a wide range of gap potentials. These precision "HV plateau curves" advance the understanding of liquid argon sampling calorimeter signals, particularly at high ionization rates. The order of magnitude differences in the activities of the beta sources allow us to estimate where the ionization chamber is driven into the space-charge dominated regime.
KW - Liquid argon calorimetry
UR - http://www.scopus.com/inward/record.url?scp=69249157378&partnerID=8YFLogxK
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U2 - 10.1016/j.nima.2009.07.013
DO - 10.1016/j.nima.2009.07.013
M3 - Article
AN - SCOPUS:69249157378
SN - 0168-9002
VL - 608
SP - 238
EP - 245
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2
ER -