| 摘要 |
<p>A two stage cryocooler sleeve is provided having a second stage heat exchanger system capable of achieving lower temperatures than the first stage heat exchanger. A current lead (273) comprising a ceramic superconductor, has a critical temperature greater than the operating temperature of the first stage (263). The lead (273) is tapered. The broader end is thermally coupled to the first stage heat exchanger (263) and the narrow end coupled to the second stage heat exchanger (265). The tapered ceramic lead reduces the heat conduction from the first heat exchanger (263) to said second heat exchanger (265).</p> |
