Products
4 Kelvin Closed Cycle Refrigerator Systems from Janis and SHI
Sample in Vacuum - SHI-4 Series
Overview
Janis SHI-4 series cryostats are among the most versatile systems available for laboratory sample cooling. They are equipped with interchangeable optics, and include provisions for a wide variety of electrical connectors. Tapped holes on the vacuum shroud and a sturdy mounting flange provide for convenient mounting in any orientation.
Standard Configuration
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| SHI-4-1
0.1 Watt 4 K Optical Cryocooler | SHI-4-5
0.5 Watt 4 K Optical Cryocooler | SHI-4
1 Watt Optical 4 K Cryocooler | SHI-4-15
1.5 Watt Optical 4 K Cryocooler |
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| SHI-4T-1 Non-Optical 4 K Cryocooler with Optional Mounting Stand | SHI-4T with Optional 800 K High Temperature Stage | SHI-4ST-1 Sub-compact, Non-optical 4 K Cryocooler | SHI-4XG-5 Low Vibration Interface 4 K Cryocooler |
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| SHI-4T-4 Non-optical 4 K Cryocooler | | | |
Janis SHI-4 series cryostats are among the most versatile systems available for laboratory sample cooling. They are equipped with interchangeable optics, and include provisions for a wide variety of electrical connectors. Tapped holes on the vacuum shroud and a sturdy mounting flange provide for convenient mounting in any orientation.
Our Special Values page has one SHI-4-1 unit available. Click here for more details.
These cryostats are designed for measurements to 325 K, and optional configurations permit operation to 500 K or 800 K (with special thermometry).
Optimized for experiments requiring optical access to the sample, these systems include the following components:
- Optical vacuum shroud and radiation shield
- Four o-ring sealed quartz windows
- Gold-plated OFHC copper sample holder
- 10-pin electrical feedthrough, with three spare electrical access ports
- Evacuation valve and safety pressure relief valve
- Silicon diode thermometer and control heater
- Easily removable window block with o-ring seal located just above the windows (SHI-4-1 and SHI-4-5 systems only)
Available options:
- Additional electrical feedthroughs (BNC, SMA, multipin, and others)
- Rotatable vacuum shroud
- Rotation and positioning stages
- Matrix isolation configuration
- Fifth window port
- Radiation shield windows
- IR and other window materials
- Custom designed vacuum shroud
- 500 K & 800 K high temperature systems available on most models (800 K with special thermometry)
- Non-optical configurations
- Compact vacuum shroud (for use with electromagnets)
- Large sample volume configurations
Standard models include:
("x" indicates the cooling power of the refrigerator)
- SHI-4-x (Optical)
- SHI-4T-x (Non-optical)
- SHI-4S-x (Sub-compact)
- SHI-4XG-x (Low vibration interface)
- CCR4-MMP (Cryogen-free probe station)
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Specifications
(including radiational heat load)
| | SHI-4-1 | SHI-4-5 | SHI-4 | SHI-4-15 |
| Temperature Range | <5 K* to 325 K | <4.5 K to 325 K | <4 K to 325 K | <4 K to 325 K |
| Initial Cooldown Time | <120 Minutes
to 5 K | ~70 Minutes
to 4.5 K | 60 Minutes to 4 K | 60 Minutes to 4 K |
Cold Head
Cooling Power | 0.1 W @ 4.2 K | 0.5 W @ 4.2 K | 1 W @ 4.2 K | 1.5 W @ 4.2 K |
| Cryostat Weight | 36 lbs. | 53 lbs. | 62 lbs. | 63 lbs. |
| Compressor Cooling | Air | Water | Air or Water | Air or Water |
| * With four open radiation shield ports, f1 view angle. |
NOTE: 500 K and 800 K versions available on most models.
Other Configurations
Special designs include:
SHI-4R 4 K Cryocooler with rotatable vacuum shroud
A 1W @ 4.2 K system is shown. You can see another Model SHI-4R-1 on our Matrix Isolation page.
4 K Closed Cycle Refrigerator with Two-Axis Optical Alignment
Janis Research Company is proud to announce rotation and positioning stages for our 4 K closed cycle sample in vacuum cryostat systems. Rotation about the cryostat access has ~0.5° resolution and a range of ±360° about the cryostat axis and rotation is only limited by the helium flexlines and electrical cables. Rotation off the cryostat access has a resolution of <0.2° and a full range of ±90° of motion. The system comes with four radiation shield windows and reaches a sample base temperature of ~4K. This system is ideal when fine optical alignment is required for experimental samples. Click on the photos below for a larger view. Click here to download a mechanical drawing of this system. (PDF 101 KB)
Special SHI-4-15-UHV
Special 1.5 Watt system with an 8" conflat tee for an instrumentation skirt. The customer will install this system on a UHV chamber (although the system itself is not truly UHV compatible).
Special SHI-4-15-UHV
The photo shows a bare model RDK-415D2B cold head with a non-rotatable 8" CF flange and a heater block on the 2nd stage with a temperature sensor and two cartridge heaters. The system is designed to mount directly onto a user-supplied UHV chamber. This is not a "true UHV" system because baking temperature is limited to 60 degrees C; it is designed for high vacuum conditions.
Special SHI-4XG-15-UHV
This special 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 particular customer plans to use this system in scanning probe microscopy measurements. With this special system's radiation shield window configuration, it has a base temperature of 3 K.
Special 1.5 W System for Cooling Hydrogen Gas
Special Model SHI-4-15 with a conflat flange and heat exchangers on the 1st and 2nd stages for cooling Hydrogen gas. The end user will install this cryocooler in an existing vacuum chamber and make his own connections to his Hydrogen inlet and outlet lines.
SHI-4-15 with Cooled Radiation Shield Windows for Operation Below 3 K (Typical)
This model SHI-4-15 has optional cooled radiation shield windows. The base temperature of this 1.5 Watt at 4.2 K system is expected to reach 3 K.
SHI-4H-1
This model SHI-4H-1 is a high temperature (500 K) system built on a RDK-101D cold head. Show with optional mounting stand with a black anodize finish.
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