Speaker
Description
Low-background noble liquid Time Projection Chambers (TPCs) are commonly used in particle physics for dark matter, neutrinoless double beta decay, Coherent Elastic Neutrino-Nucleus Scattering (CEvNS), and other rare event searches. Xenon and argon are the two most typical media for this technology, each conferring unique advantages- argon is inexpensive and therefore more easily scalable, whereas xenon’s scintillation light is longer in wavelength and therefore more easily detectable with commercial photodetectors and is less subject to attenuation in the liquid medium. While experiments have primarily leveraged either element, argon doped with xenon at the ~10 ppm-to-percent level is becoming increasingly attractive for use in rare event searches, preserving some attractive properties of both media to produce xenon-like scintillation signals at argon-like costs. The CHILLAX experiment leverages a mixed-medium TPC to characterize the electroluminescence properties of this doped medium as a function of xenon concentration and has achieved the highest concentration of xenon in liquid argon to date at 5%. We discuss the signal generation and collection architecture behind recent CHILLAX results and how these signals are analyzed to study the effect of xenon concentration on argon gas electroluminescence. We further address improvements to the light readout system and liquid level meter and consider their impacts on overall detector sensitivity.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | No |