Jul 22 – 27, 2018
US/Eastern timezone

Measurements of electron extraction efficiency and low-energy electron recoil response in a two-phase xenon time projection chamber

Jul 24, 2018, 5:50 PM
117 (MacMillian)



Brown University Providence, Rhode Island, USA
Talk Direct Detection 2.5 Direct Detection


Ethan Bernard (University of California, Berkeley Physics Dept.)


We describe two new measurements from the PIXeY two-phase xenon time projection chamber. The extraction efficiency of quasi-free electrons from the xenon surface was measured as the field in the gas above the liquid surface was varied from 4.5 to 13.1 kV / cm. The extraction efficiency was seen to increase even at the highest fields, suggesting that the charge signals in two-phase xenon detectors can be increased if stronger fields in the gate-anode region can be suitably engineered. We also describe the response of this detector to $^{37}\!\rm{Ar}$, which provides a useful low-energy internal calibration source for WIMP direct detection experiments.

Primary authors

Ethan Bernard (University of California, Berkeley Physics Dept.) Elizabeth Boulton (Yale University Physics Dept.) Blair Edwards (Yale University Physics Dept.) Nicholas DeStefano (University of Connecticut Physics Dept.) Scott Hertel (University of California, Berkeley Physics Dept.) Markus Horn (Yale University Physics Dept.) Nicole Larsen (Yale University Physics Dept.) Brian Tennyson (Yale University Physics Dept.) Chris Wahl (Yale University Physics Dept.) Daniel McKinsey (University of California, Berkeley Physics Dept.) Moshe Gai (University of Connecticut Physics Dept.)

Presentation materials