Multi-stage pulse tube with matched temperature profiles

Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...

Reexamination Certificate

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Reexamination Certificate

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07568351

ABSTRACT:
Convection losses associated with different temperature profiles in the pulse tubes and regenerators of multi-stage pulse tubes mounted in helium gas in the neck tube of a MRI cryostat are reduced by providing one or more of thermal bridges, and/or insulating sleeves between one or more pulse tubes and regenerators, and/or spacers, and spacer tubes, in one or more pulse tubes and regenerators.

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