Products

4 K Closed Cycle Refrigerator Systems

Application Specific Models - Vibration Isolated Cryocoolers

Overview

Click button below to enlarge view of SHI-4XG-5 4 K cryocooler with low vibration interface from Janis Research

In a traditional closed cycle refrigerator system, samples are mounted directly to the cold head. When the system is operated, the several micron-sized vibrations, inherent in every closed cycle system, are transmitted directly from the cold head to the samples.

CCR-XG systems are specifically designed to minimize vibrations at the sample, while at the same time utilizing a closed cycle refrigerator and providing a sample in vacuum environment. These systems isolate the vibrations of the cold head from the sample by using helium exchange gas and rubber bellows. Instead of being attached directly to the cold head, the sample is mounted to a stage that is not connected to the cold head, yet is cooled via helium exchange gas. This arrangement allows the sample to cool, while simultaneously reducing the vibrations. The rubber bellows connects the body of the cryostat to the cold head. When the cryostat and cold head are supported separately, little to no vibrations reach the body of the cryostat via the rubber bellows.

Enlarge

Standard Configuration

Click image to enlarge view of low vibration cryocooler from Janis Research.  A 4 K system is show.  Also available with 10 K cold heads.In a traditional closed cycle refrigerator system, samples are mounted directly to the cold head. When the system is operated, the several micron-sized vibrations, inherent in every closed cycle system, are transmitted directly from the cold head to the samples.

Click on button below to enlarge view of mechanical drawing for low vibration cryocooler from Janis Research.Enlarge

Model SHI-4XG-5 Low Vibration 4 K Cryocooler Mechanical Drawing - also available with a 10 K cold head. Dimensions vary depending on cold head.

CCR-XG systems are specifically designed to minimize vibrations at the sample, while at the same time utilizing a closed cycle refrigerator and providing a sample in vacuum environment. These systems isolate the vibrations of the cold head from the sample by using helium exchange gas and a rubber bellows. Instead of being attached directly to the cold head, the sample is mounted to a stage which is not connected to the cold head, yet is cooled via helium exchange gas. This arrangement allows the sample to cool, while simultaneously reducing the vibrations. The rubber bellows connects the body of the cryostat to the cold head. When the cryostat and cold head are supported separately, little to no vibrations reach the body of the cryostat via the rubber bellows.

The Model CCS-100-XG/204N (10 K) and Model SHI-4XG-5 (<5 K) systems replace the traditional optical closed cycle sample in vacuum systems: CCS-100/204 and SHI-4-1, respectively. The exchange gas isolated versions are very similar in appearance and function to the traditional optical systems, but greatly reduce the vibrations observed at the sample.

Model  SHI-4XG-5

Temperature range:  < 5 K - 300 K (at sample mount)

Initial cooldown time:  < 2 hours to 10 K

Power requirements: 200 VAC, 3-phase, 50/60 Hz, 2.8 kW

Cooling water requirements: ~3.3 liters/min @ 4-28 degrees C

(Specifications exclude radiational or experimental heat load, and are rated at 60 Hz)

The system includes:

  • Model RDK-205E two stage cold head and water-cooled compressor
  • Exchange gas vibration isolation design with flexible rubber bellows connecting cold head to cryostat
  • Exchange gas valve manifold to pump out and flow helium exchange gas
  • Outer vacuum shroud with electrical feedthroughs, evacuation valve, and safety pressure relief valve
  • Standard optical sample holder, a heater and temperature sensor

Other configurations:

Click on photo to enlarge view of special model SHI-4XG-15-UHV ultra high vacuum system that can be baked out to 500 K with exchange gas vibration isolation.  This customer plans to use the system in scanning probe microscope measurements.Special model SHI-4XG-15-UHV is a true ultra high vacuum (UHV) system that can be baked out to 500 K with exchange gas vibration isolation. This system was ordered for use in scanning probe microscopy measurements. With this special system's radiation shield window configuration, it has a base temperature of 3 K.

 

Click image to enlarge view of UHV vibration-isolated 4 Kelvin closed cycle refrigerator system.  Reference 16120Click image to enlarge view of bottom window on UHV vibration-isolated 4 Kelvin closed cycle refrigerator system.  Reference 16120Special SHI-4-XG-15-UHV with Bottom Window
Ultra high vacuum vibration-isolated 4 Kelvin closed cycle refrigerator system

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Microscopy Configurations

Click image to enlarge view of low vibration cryocooler for microscopy from Janis Research.  A 4 K system is shown.  Also available with a 10 K cold head.The Model CCS-XG-M/204N and SHI-4XG-5-M systems both have a horizontal extension making them ideal for optical microscopy experiments. These extensions are roughly 1.5” tall to allow them to fit in many optical microscopes. In addition, the horizontal extension allows the sample to be positioned very close to the top window, an essential feature for short focal length microscope objectives. This horizontal extension also allows for easy sample changes; simply remove the horizontal extension top plate and radiation shield plate to access the sample area.

Click on button below to enlarge view of mechanical drawing for model CCS-XG-M-204N low vibration 10 K closed cycle refrigerator from Janis ResearchEnlarge

Model CCS-100-XG-M Low Vibration 10 K Cryocooler for Microscopy Mechanical Drawing - also available with a 4 K cold head.  Dimensions vary depending on cold head.

Model SHI-4XG-5-M

Temperature range: 4.2 K - 300 K (at sample mount)

Power requirements: 200 VAC, 3-phase, 50/60 Hz, 2.8 kW

Cooling water requirements: ~3.3 liters/min @ 4-28 degrees C

(Specifications exclude radiational or experimental heat load, and are rated at 60 Hz)

The system includes:

  • Model RDK-205E two stage cold head and water-cooled compressor
  • Exchange gas vibration isolation design with flexible rubber bellows connecting cold head to cryostat
  • Exchange gas valve manifold to pump out and flow helium exchange gas
  • Outer vacuum shroud with electrical feedthroughs, evacuation valve, and safety pressure relief valve
  • Horizontal vacuum shroud extension with top and bottom quartz windows
  • Horizontal cold finger extension with an optical sample holder, a heater and temperature sensor.

Click here to contact Janis today!

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