| 摘要 |
<p>The present invention relates to pulse tube refrigerators for recondensing cryogenic liquids. In particular, the present invention relates to the same for magnetic resonance imaging systems. In many cryogenic applications components, e.g. superconducting coils for magnetic resonance imaging (mri), superconducting transformers, generators, electronics, are cooled by keeping them in contact with a volume of liquified gases (e.g. helium, neon, nitrogen, argon, methane). In a first aspect, the present invention provides pulse tube refrigerator (PTR) arrangement (90,101,103) within a cryogenic apparatus, wherein a regenerator tube (94,92) of the PTR is finned. In this configuration the fins or baffles (104,120,122,126,128,130,132,102), are believed to increase the surface area available for distributed heat transfer from the helium atmosphere to the regenerator.
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