关键词: 量子电压标准, 约瑟夫森效应, 量子超导阵列(芯片), 液氦, 制冷机

Abstract: The traditional quantum voltage standard device,liquid helium is used to provide 4.2K low temperature environment,but under background of tight supply of global liquid helium resources and more expansive,it is of practical signification to study the refrigeration free helium technology suitable for quantum voltage standard device,reduce the cost of standard operation and maintenance,and expand the use range of standard.However,the change of cryocool system need solve two problems:one is that the cooling capacity provided by the cryocool system must exceed the operation demand of superconducting array,and the other is to keep the temperature fluctuation during the operation of the chip within the allowable range.The paper introduces a cryocool system can solve the problems above.According to the technical requirements of superconducting chip,the operating temperature is less than 4.2K,the cooling power is more than 1W,and the temperature fluctuation is 20mK.

Key words: Quantum voltage standard, Josephson Effect, Quantum superconducting array(Chip), Liquid helium, Croycooler