<p>We describe a newly developed top-loading <sup>4</sup>He sorption refrigerator. The top-loading configuration allows for rapid sample exchange, efficient cooling, and modular probe construction. A prototype comprises a condenser, an evaporator, a charcoal adsorption pump, and a top-loading probe, precooled by a Gifford–McMahon cryocooler. The base temperature and hold time in single-shot mode are 0.95&#xa0;K and 2.5&#xa0;h, respectively. The prototype provides a useable cooling power of 1.85&#xa0;mW at 1&#xa0;K.</p>

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Top-Loading 4He Sorption Refrigerator

  • Dong-Hun Chae,
  • Bongyeon Won,
  • Jaewan Choi

摘要

We describe a newly developed top-loading 4He sorption refrigerator. The top-loading configuration allows for rapid sample exchange, efficient cooling, and modular probe construction. A prototype comprises a condenser, an evaporator, a charcoal adsorption pump, and a top-loading probe, precooled by a Gifford–McMahon cryocooler. The base temperature and hold time in single-shot mode are 0.95 K and 2.5 h, respectively. The prototype provides a useable cooling power of 1.85 mW at 1 K.