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Preliminary test results of LAr prototype detector
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abstract
WIMPs are a well-motivated galactic dark matter candidate. Liquid argon (LAr) is an attractive target for the direct detection of WIMPs. The LAr prototype detector is designed to study the technology and property of LAr detector. The prototype detector have an active volume containing 0.65 kg of liquid argon. The liquid nitrogen(LN) cooling system allows the temperature of liquid argon to be maintained at the boiling point (87.8 K) with fluctuations less than 0.1 K. The prototype was calibrated with a Na$^{22}$ source, with the light yield 1.591$\pm$0.019 p.e./keV for the 511 keV gamma rays using the domestic-made argon purification system.
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Cited by 1 Pith paper
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Calibration of liquid argon detector with $^{83m}Kr$ and $^{22}Na$ in different drift field
A liquid argon detector yields 7.28 and 7.66 photoelectrons per keV for 41.5 keV krypton and 511 keV sodium events, with light output falling by 8.4% and 21.4% at 200 V/cm drift field.
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