Evaluation of a 4 K 4-stage pulse tube cryocooler for superconducting electronics.
Evaluation of a 4 K 4-stage pulse tube cryocooler for superconducting electronics.
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发表时间：
2009
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通讯作者：
R. Webber;V. Dotsenko;J. Delmas
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作者：
R. Webber;V. Dotsenko;J. Delmas
数字和混合信号超导电子器件的市场应用需要将稳健、长寿命、高效的4 K低温冷却器与包括超导集成电路（IC）的同样稳健的低温封装集成在一起。理想的4 K制冷机，具有完全的可靠性，功率和成本效率，以及可制造性，尚未商业化。最近，一个定制设计的实验室原型的4 K 4级斯特林型脉冲管制冷机是由洛克希德马丁公司生产的，并交付给HYPRES。我们已经调整了系统与低温包装，我们用来安装和成功地测试超导IC与各种Nb电路，包括RSFQ二进制计数器。对于600 W的总压缩机功率和宽带输入-输出线的封装，扩展的稳定操作的计数器在T=4.5 K被证明与时钟频率高达46 GHz的时钟速度，与25 mW的多余的冷却能力的最冷的阶段（4.5 K）。该制冷机的热力学和机械性能对于开发用于无线通信等超导电子应用的改进型紧凑型制冷机是有希望的。
Market applications of digital and mixed-signal superconducting electronics require the integration of a robust, long life, highly efficient 4 K cryocooler with an equally robust cryopackage including superconducting integrated circuits (ICs). The ideal 4 K cryocooler, with full reliability, power and cost efficiency, and manufacturability, is not yet commercially available. Recently, a custom-designed laboratory prototype of a 4 K 4-stage Stirling-type pulse-tube cryocooler was produced by Lockheed-Martin and delivered to HYPRES. We have adapted the system with a cryopackage which we used to mount and successfully test a superconducting IC with a variety of Nb circuits including an RSFQ binary counter. For 600 W total compressor power and a package with broadband input-output lines, extended stable operation of the counter at T=4.5 K was demonstrated with a clock frequency up to 46 GHz clock speed, with 25 mW of excess cooling capacity on the coldest stage (4.5 K). The thermodynamic and mechanical performance is promising for the development of an improved compact cryocooler for superconducting electronic applications such as wireless communications.