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Lake Shore 4 K CCR Series Cryostats
4 K cryogen-free closed-cycle refrigerators
Optimised for ease of use and versatility, the Lake Shore 4 K CCR Series cryostats provide uniform cooling of powders, liquids, and irregularly shaped solid samples down to 4 K. Heaters and sensors on both the copper sample chamber and sample mount are used with a dual-loop temperature controller for rapid and precise sample temperature control.
For more information please visit Lake Shore Cryotronics
Two-stage Gifford-McMahon (G-M) refrigerator systems have been in widespread use for several decades. Room temperature helium gas is first compressed and then supplied to the refrigerator via flexible gas lines. The compressed helium is cooled by expansion and provides cooling to two heat stations on the refrigerator. After cooling the refrigerator, the gas is returned to the compressor to repeat the cycle.
Pulse tube (PT) refrigerator systems use a similar compression/expansion cycle but eliminate the moving regenerator found in G-M cryocoolers. PT cryocoolers often have reduced vibration levels at the vacuum interface flange as compared with G-M systems.
Is a 4 K cryocooler economically practical?
Prior to the introduction of 4 K cryocoolers, liquid helium was most commonly used to cool equipment and experiments to 4 K. The following chart shows the operating cost of a typical liquid helium-cooled apparatus (not including storage Dewar evaporative losses). In some cases, the entire cost of a 4 K refrigerator can be recovered in the first year!
- 4 K to 325 K (options for 500 K and 800 K)
- Low-vibration 40 nm option
- Autorotation option
|Minimum temperature||4 K|
|Maximum temperature||800 K|
|Vibration||Low-vibration 40 nm option|
|Cryocooler power options||0.2 W, 0.7 W, 1 W, 1.2 W, 1.5 W, 2.0 W at 4.2 K|