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- W1618438400 abstract "A novel liquid argon (LAr) purity monitor was developed with a sensitivity to electronegative impurities of the order of ppb (O$_2$ equivalent). Such a high purity is e.g. needed in a LAr drift chamber. The principle is to measure the lifetime of quasifree electrons in LAr, since this is the important parameter for the operation of a drift chamber. Free electrons are produced by ionizing the LAr with $alpha$-particles emitted by the $^{210}Po$ chain daughter of an isotope $^{210}Pb$ source. From a measurement of the charge of the electron cloud at the beginning and at the end of a drift path, together with the drift time, the lifetime of the electrons is obtained. The $alpha$-particles have a very short range of about 50 mu$m in LAr and the ionization density is very high, typically between $750div 1500rm MeV/cm$, leading to a high recombination rate. To suppress the recombination of the argon ions with the electrons, the $alpha$-source was put in a strong electric field of $40div 150$ kV/cm. This was achieved by depositing the source on the surface of a spherical high voltage cathode with a diameter of about 0.5 mm. The anode was also made as a sphere of about the same diameter as the cathode, thus, close to the axis between the two electrodes the electric drift field was approximately a dipole field." @default.
- W1618438400 created "2016-06-24" @default.
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- W1618438400 date "2004-12-28" @default.
- W1618438400 modified "2023-09-27" @default.
- W1618438400 title "Development of a novel high-sensivitiy LAr purity monitor based on an alpha-source" @default.
- W1618438400 hasPublicationYear "2004" @default.
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