By Michael Schenk
Michael Schenk evaluates new applied sciences and techniques, akin to cryogenic read-out electronics and a UV laser method, constructed 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 power move (LET) of muons and the longitudinal diffusion coefficient of electrons in liquid argon. the consequences are acquired by means of analysing occasions brought on by means of cosmic-ray muons and UV laser beams. The stories are performed with ARGONTUBE, a prototype LArTPC in operation on the college 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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Extra resources for Studies with a Liquid Argon Time Projection Chamber: Addressing Technological Challenges of Large-Scale Detectors
Sample text
1) The amount of oxygen that can be bound in a purifier cartridge is limited. 67 nom. l/kg, which was found to be about 10 % of the theoretical value [43]. The oxidation process can be reversed and thus the filtering capabilities of the agent can be recovered by flushing the purifiers with hydrogen gas H2 while providing a certain amount of heat. 2) with water vapour being a by-product of the reduction process. Similarly, the water molecules that are adhered to silica gel are released by baking the filter out at about 100 ◦ C for a certain amount of time.
Thanks to the cascade structure of the HV multiplier, it was possible to design the field cage such that there is exactly one Greinacher stage in between two ring electrodes. Given the 125 electrodes, a bias voltage of 2 kV between any two rings leads to a maximum negative potential of −250 kV on the cathode. Consequently, an AC voltage of up to 2 kV peak-to-peak has to be fed in. The Greinacher multiplier with its sharp edges and tiny structures is installed on the inside of the field cage (see Fig.
1) The amount of oxygen that can be bound in a purifier cartridge is limited. 67 nom. l/kg, which was found to be about 10 % of the theoretical value [43]. The oxidation process can be reversed and thus the filtering capabilities of the agent can be recovered by flushing the purifiers with hydrogen gas H2 while providing a certain amount of heat. 2) with water vapour being a by-product of the reduction process. Similarly, the water molecules that are adhered to silica gel are released by baking the filter out at about 100 ◦ C for a certain amount of time.
