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Gifford-McMahon cryocoolers

Cryocoolers

Closed-cycle coolers for the 20–80 K range. They condense hydrogen, nitrogen, and argon with published capacities from 18 W to 600 W. They are separate from the pulse tubes used on H-gate dilution frames.

Highlights

20–30 K class

Used where hydrogen must be liquefied, a fusion magnet needs a cold bus, or a high-temperature superconductor has to stay near 20 K. The AL630 is the largest in this class: 100 W at 20 K.

80 K class

Used to condense nitrogen or argon and to hold larger heat loads, including power leads and scintillator detectors. The AL600 is the largest: 600 W at 80 K.

Service interval

Mean time between maintenance is 10,000 hours. The warranty is 3 years or 8,000 hours, whichever comes first. Most service is done at the installed site.

Any orientation

The cold head can sit vertical, horizontal, or at an angle. Capacity does not depend on which way it points.

20–30 K cryocoolers

Base temperature for this class is at or below 17 K.

Model	Compressor	Cooling capacity	Base temperature
AL63	CP103	18 W at 30 K	≤ 17 K
AL230	CPA2850	60 W at 30 K	≤ 17 K
AL330	CPA2870	94 W at 30 K	≤ 17 K
AL325	CPA1110	100 W at 25 K	≤ 17 K
AL630	CPA1114	100 W at 20 K	≤ 17 K

80 K cryocoolers

Base temperature for this class is at or below 25 K.

Model	Compressor	Cooling capacity	Base temperature
AL60	CP103	60 W at 80 K	≤ 25 K
AL125	CP103	120 W at 80 K	≤ 25 K
AL200	CPA2850	200 W at 80 K	≤ 25 K
AL300	CPA2870	320 W at 80 K	≤ 25 K
AL600	CPA1114	600 W at 80 K	≤ 25 K

Custom options

A cold head can be built with the interface the apparatus needs. The usual additions are below. Parts and adsorbers for the compressor are handled as a service item.

Conflat flanges
ISO flanges
Gas feedthroughs
Electrical feedthroughs
Recondensing heat exchangers
Gas pre-cooling tube

Pulse tubes used on the dilution frames are listed on the cryocoolers page.

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