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4 K CCR cryostats

SHI-4

4 K CCR cryostat features

  • Top-loading static helium thermal exchange gas configuration
  • Closed-cycle cryocooler design allows nearly unlimited unattended operation
  • Choice of cryocooler to match performance and budget requirements
  • Optimized for two-loop temperature control—helium thermal exchange gas is heated and controlled by one heater and calibrated silicon diode, while a second heater and sensor on the sample mount enable rapid temperature sweeps and precise sample temperature control
  • The sample is accessed by removing the top‑loading sample positioner
  • Four orthogonal sets of windows can be used in either transmission or reflection geometry (SHI-950-XX)
  • The non-optical tail can be inserted into the pole gap of an electromagnet or into a room temperature bore superconducting magnet (SHI-950T-XX)
  • The non-optical tail fabricated from either thin-walled aluminum or vanadium for use in neutron applications (SHI-950T-NEUTRON-XX)
  • O-ring sealed ports accept DC and RF electrical feedthroughs
  • Optional DC and RF wires and cables for electrical measurements

Is a 4 K cryostat economically practical?

Prior to the introduction of 4 K cryostats, 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!

Liquid helium costs 4 K cryocoolers

Janis — a Lake Shore Company

Lake Shore offers a variety of 4 K cryostats

Sample in vacuum (SHI-4 Series)

Sample in static exchange gas (SHI-950, SHI-850 Series)

Vibration-isolated

Application-specific — neutron scattering

Application-specific — Mössbauer spectroscopy

Application-specific — FTIR spectroscopy

Custom engineered and specialized

SHI 0.2 W at 4.2 K

SHI 0.4 W at 4.2 K

SHI 0.7 W at 4.2 K

SHI 1 W at 4.2 K

SHI 1.5 W at 4.2 K

SHI 6 K

SHI 0.1 W compressor

SHI 0.4 W compressor

SHI 0.5 W compressor

SHI 1.0 and 1.5 W compressors

Pulse tube cryocoolers

Not sure if you need a pulse tube cryocooler or a Gifford-McMahon cryocooler? Read about the three main differences between these two types of cryocoolers.

4 K cryogen-free closed-cycle cryostats from Lake Shore and SHI

Why should I consider using a 4 K cryostat?

4 K cryostats allow you to cool samples, devices, and/or equipment without the inconvenience and expense of liquid helium. They can be applied to a broad range of applications in both research and industry. Some typical uses include materials research, superconductivity, cryopumps, shield cooling, and helium recondensing.

How do 4 K cryostats work?

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) cryocooler 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. See the three main differences between PT cryocoolers and G-M cryocoolers.

Sumitomo Heavy Industries (SHI) 4 K cryocoolers are available in both modified G-M cycle and PT configurations, employing rare-earth heat exchanger materials. These materials retain useful heat capacity to temperatures below 4 K, resulting in base temperatures previously unobtainable in a two-stage cryocooler.

Why should I choose Lake Shore?

Lake Shore is a distributor of 4 K G-M refrigerators manufactured by the Cryogenic Department of SHI. More than just a distributor, we are a preferred cryostat partner of SHI and have been manufacturing cryogenic equipment for decades. Our team of engineers and designers includes many with advanced degrees, with over 200 years of combined experience in the field of cryogenics. This experience and innovation were rewarded with a 1998 R&D 100 award, as well as two of NASA’s Public Service Group Achievement Awards.

What does our experience mean for you?

It has enabled us to create designs that are sophisticated yet simple to operate, and customized to meet your specific application requirements. We can guide you through the range of available options, and help you choose the 4 K cryostat that is right for you. See the links above for a wide range of cryostat possibilities. Then contact a Lake Shore sales engineer for help selecting the one that is right for your application and budget.