Low noise liquid helium reliquifying circulation apparatus

Abstract

A liquid helium reliquefying circulation apparatus according to an embodiment of the present disclosure includes a pulse tube cryocooler comprising a cold head, a first stage heat exchanger, and a second stage heat exchanger; an upper inner chamber disposed to surround a first stage regenerator disposed on the first stage heat exchanger; a lower inner chamber disposed to surround the second stage heat exchanger and a second stage regenerator disposed on the second stage heat exchanger; and a cryocooler inner pipe, connected to a lower plate of the lower inner chamber, formed of metal, transporting liquid helium, and having flexibility.

Dependencies are inferred from the claim text.