Manenti, L;
Cremonesi, L;
Arneodo, F;
Basharina-Freshville, A;
Campanelli, M;
Holin, A;
Nichol, R;
(2020)
Performance of different photocathode materials in a liquid argon purity monitor.
Journal of Instrumentation
, 15
(9)
, Article P09003. 10.1088/1748-0221/15/09/P09003.
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Abstract
Purity monitor devices are increasingly used in liquid noble gas time projection chambers to measure the lifetime of drifting electrons. Purity monitors work by emitting electrons from a photocathode material via the photoelectric effect. The electrons are then drifted towards an anode by means of an applied electric drift field. By measuring the difference in charge between the cathode and the anode, one can extract the lifetime of the drifting electrons in the medium. For the first time, we test the performance of different photocathode materials—silver, titanium, and aluminium—and compare them to gold, which is the standard photocathode material used for purity monitors. Titanium and aluminium were found to have a worse performance than gold in vacuum, whereas silver showed a signal of the same order of magnitude as gold. Further tests in liquid argon were carried out on silver and gold with the conclusion that the signal produced by silver is about three times stronger than that of gold.
| Type: | Article |
|---|---|
| Title: | Performance of different photocathode materials in a liquid argon purity monitor |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1748-0221/15/09/P09003 |
| Publisher version: | https://doi.org/10.1088/1748-0221/15/09/P09003 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10124808 |
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