| 摘要 |
PURPOSE:To alleviate the influence of a magnetic field for a Josephson junction element having extremely high sensitivity particularly for the magnetic field by supplying electric power to an electronic instrument in a cooler by increasing a high voltage power source to a high voltage. CONSTITUTION:An electronic device 3 such as a computer which mounts electronic parts operating in a cryogenic temperature zone is mounted in atmosphere of cooling medium 2 of a cooler 1. A power source 8 is raised at its voltage to a high voltage until the power current (i) supplied to the device 3 becomes several amperes which can be ignored for the influence of a magnetic field, and connected via conductors 9, 9' to the voltage converter 6 of the device 3. The converter 6 drops the power voltage supplied from the power source 8 to a low voltage. |
