ISAC‐II is an upgrade of the radioactive‐beam facility that includes the addition of a 48‐MV heavy‐ion superconducting linear accelerator (LINAC). A first stage comprising a 500 W class LHe refrigerator and distribution piping to five cryomodules is scheduled for commissioning and operation in the fall of 2005. The paper will present the design, installation and commissioning of the phase 1 system, including a description of the refrigerator, helium storage, gas recovery, distribution piping and overall refrigerator / LINAC layout.

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