17-22 July 2016
Master Cutlers Hall
Europe/London timezone

Differential capacitive measurement and monitoring sensors for the LUX-ZEPLIN dark matter detector

19 Jul 2016, 15:40
20m
Venue: Cutlers' Main Hall (First Floor); Chair: Darren Grant; Session Manager: David Woodward ()

Venue: Cutlers' Main Hall (First Floor); Chair: Darren Grant; Session Manager: David Woodward

Speaker

Ms. Kathryn Boast (University of Oxford)

Description

Two-phase liquid noble gas detectors for rare event search experiments require a precise knowledge of the liquid-gas interface position. This is often provided through liquid level monitoring sensors. In this talk I will report on a newly developed method of differential capacitive measurement that can be employed in capacitive sensors. The feedback circuit design enables the measurement of small changes in picofarad capacitances to femtofarad precision while suppressing the effect of the nanofarad capacitance of the cables used. The feedback mechanism employs multiple amplifiers with the loop gain of the feedback circuit suppressing the cable capacitance. This enables the design of capacitive liquid level sensors and position sensors, which will monitor shrinking during the cooling of LUX-ZEPLIN.

Primary author

Ms. Kathryn Boast (University of Oxford)

Co-authors

Mr. FengTing Liao (University of Oxford) Prof. Hans Kraus (University of Oxford)

Presentation Materials

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