Abstract
Helium liquid-gap and gas-gap heat switches are operated at 2 K. They are tested for their on- and off-conductance and turn-on and turn-off times. The measured on- and off-conductance of the heat switches are close to the theoretical values. The on- to off- conductance ratio of the liquid-gap heat switch is 6900 and that of the gas-gap heat switch is 1300. The turn-on times of both heat switches are approximately one minute. For the liquid- gap heat switch the turn-off time is under three minutes. The turn-off time of the gas-gap heat switch is on the order of ten minutes due to the adsorbed helium on the interior surfaces of the heat switch.
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