Measurements

Studies with a Liquid Argon Time Projection Chamber: by Michael Schenk

By Michael Schenk

Michael Schenk evaluates new applied sciences and strategies, similar to cryogenic read-out electronics and a UV laser procedure, built to optimise the functionality of huge liquid argon time projection chambers (LArTPC). among others, the writer stories the uniformity of the electrical box produced through a Greinacher high-voltage generator working at cryogenic temperatures, measures the linear power move (LET) of muons and the longitudinal diffusion coefficient of electrons in liquid argon. the consequences are received by way of analysing occasions caused via cosmic-ray muons and UV laser beams. The reviews are performed with ARGONTUBE, a prototype LArTPC in operation on the collage of Bern, Switzerland, designed to enquire the feasibility of float distances of as much as 5 metres for electrons in liquid argon.

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Studies with a Liquid Argon Time Projection Chamber: Addressing Technological Challenges of Large-Scale Detectors

Michael Schenk evaluates new applied sciences and strategies, equivalent to cryogenic read-out electronics and a UV laser process, built to optimise the functionality of enormous liquid argon time projection chambers (LArTPC). among others, the writer reviews the uniformity of the electrical box produced by means of a Greinacher high-voltage generator working at cryogenic temperatures, measures the linear strength move (LET) of muons and the longitudinal diffusion coefficient of electrons in liquid argon.

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RGAs are sensitive devices and must be operated at pressures of the order of 10−7 mbar or lower. A leak valve allows fine regulation of the gas flux into the mass spectrometer volume which is continuously evacuated by a turbomolecular pump (not shown in the schematic) to maintain the high vacuum. After a number of first tests and measurements with the RGA, the regeneration system was extended by an additional gas monitoring device, called a dewpoint meter (Shaw Grey Spot sensor and Superdew 3)5 , able to measure the amount of moisture to ppmV precision, and with a sensitivity of 1 ppmV [81].

To achieve a smooth and inert surface, they are made of gold-plated and polished solid aluminum. 2: Left: The Argontube during the maintenance and preparation phase for the following run. The TPC is attached to the top flange and partly extracted from the inner vessel. Right: The Argontube fully instrumented and in operation. 5 % within the detector sensitive volume [7]. 3 on the bottom right. PAI is a high-tech polymer with exceptional mechanical and thermal properties, chemical resistance and a low outgassing rate.

7: Left: Read-out section of the Argontube showing the wireplane with the cryogenic preamplifiers (LARASIC4 chips [56, 62, 63]). The capacitors of the Greinacher circuit as well as the central quartz-glass feedthrough are visible. The PMTs are inside a Faraday cage for reasons discussed in the text. Right: A photograph of the two internal PMTs shielded by an aluminum cage after a test in liquid argon. 0 μs. The Argontube read-out is configured for maximum gain and Tp = 3 μs. 0 mV/nA for the former ‘warm’ preamplifiers [68].

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