Studies of Photoelectricity and Multi-Photon Ionization in Gaseous and Liquid Xenon

Not scheduled
20m
Kongresshaus Stadthalle Heidelberg (Heidelberg)

Kongresshaus Stadthalle Heidelberg

Heidelberg

Neckarstaden 24 69117 Heidelberg Germany
Poster 0vbb Poster (not participating in poster prize competition)

Speakers

Prof. Krishna Kumar (Stony Brook University)Dr Michal Tarka (University of Massachusetts, Amherst)Prof. William Fairbank (Colorado State University)

Description

We are investigating novel in-situ laser-driven techniques to enhance calibration and monitoring of transport properties of charge clusters in nEXO. One approach is to study electron drift properties in a small liquid xenon TPC using photoelectricity. The charged clusters are generated by driving a semi-transparent gold photocathode in transmission mode with a pulsed ultraviolet laser. Systematic measurements of drift velocities, temperature coefficients and longitudinal diffusion coefficients of both liquid and gaseous xenon at various drift fields were made. In a second approach, liquid xenon purity was studied in a dedicated cell by observing 2- and 3-photon ionization at four different wavelengths. The ionization cross-sections at two different wavelengths were extracted. The behavior of multi-photon ionization and gold photoelectricity in a xenon environment will help in designing appropriate calibration schemes for future large scale noble liquid detectors.
Authorship annotation for the nEXO collaboration
Session and Location Monday Session, Poster Wall #62 (Auditorium Gallery Right)
Poster included in proceedings: yes

Primary author

Prof. Krishna Kumar (Stony Brook University)

Co-authors

Dr Michal Tarka (University of Massachusetts, Amherst) Mr Oumarou Njoya (Stony Brook University) Dr Thomas Tsang (Brookhaven National Laboratory) Dr Triveni Rao (Brookhaven National Laboratory) Prof. William Fairbank (Colorado State University)

Presentation materials