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Abstract
A novel helium-gas-filled coaxial insert sealed with ceramic feedthroughs, which thermally grounds the superconducting niobium inner conductor of a coaxial transmission line at the 1.3-K pot of a dilution refrigerator, is described. This transmission line–insert combination overcomes the large heat leak associated with room temperature coaxial access to a dilution refrigerator and results in relatively unperturbed broadband transmission of radio-frequencies from room temperature to the mixing chamber, with a heat load of less than 1 μW. Two such lines are used to access a cw NMR system incorporated in an Oxford Instruments model 200 top-loading dilution refrigerator, resulting in a rise of the base temperature from 10 mK up to 12 mK. The thermal impedance of the insert with and without helium is analyzed between 1.5 and 6 K; it is shown that the heat leak can be further reduced by an order of magnitude with relatively minor modifications.
Published Version
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