Special designs include:
Special SHI-4-1 with Very Large Cold Plate on 2nd Stage and Cooled Radiation Shield Windows
This system also has six semi-rigid cables connected from hermetic 2.92 mm feedthroughs on the instrumentation flange to the cold plate.
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.
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 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).
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.
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 SHI-4XG-15-UHV with Bottom Window
Ultra high vacuum vibration-isolated 4 Kelvin closed cycle refrigerator system
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.
Special 1.5 W @ 4.2 K System with Coils Wrapped around the 1st and 2nd Stages for Cooling Gas from Room Temperature to ~ 4 K
This special model SHI-4-15-UHV was used in Ion trap measurements. Janis Research provided the coldhead with the cooling coils and an instrumentation skirt. The second stage has a heater and temperatures sensor to make it a fully variable temperature system. The customer connected the cooling coils to their room temperature gas supply with the other end going into the ion trap.
Similar systems could be used in other applications to condense any gas into liquid.
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.
Special RDK-415D Coldhead
The photo shows a special RDK-415D cold head with a conflat flange and some copper tubes wrapped around each stage for cooling a gas to 4 K or less.
Standard Window Block with Countersunk Screw Holes Option
Janis Research usually uses pan-head screws on the retainers of window blocks, which add about 0.125” to each side of the window block. In cases were space is an issue, talk to your sales engineer about countersunk screw holes in the retainers so that flathead screws can be used, as shown in this photo. This option can be offered on most window blocks with o-ring sealed windows. The window block shown can be used on our model VPF-100, VPF-800, ST-100, CCS-150, CCS-100/202, CCS-100/204 and SHI-4-2.
Modified Window Block
The photos show a standard optical cryostat with a specially modified window block. Two of the windows are our standard 1.63" diameter clear view fused Quartz. The other two windows are a special 2.63" diameter clear view fused Quartz. This window block can be used as an option on many other systems such as ST-100, VPF-100, SHI-4-2, SHI-4-5, SHI-4, CCS-150, CCS-450, CCS-100/202 and CCS-100/204. (The CCS-100/204 an use an optional large window using a different window block.) Contact email@example.com for more information.
Optional Rotating Stand for 4 K and 10 K Cryocooler Systems
This model PTSHI-4-5 features an optional rotating stand that allows the user to flip the entire cryostat upside-down. This is convenient for changing samples. The cryostat itself is rather heavy and it doesn't have any flat surface that will allow it to rest upside-down by itself. Without this rotating stand, gaining access to the sample area would be very difficult and inconvenient. This particular stand is designed to hold the cryostat 50mm above the surface of an optical table but could be designed to hold the cryostat at any height specified by the customer. This stand can be used for 4 K and 10 K Cryocooler systems. Contact firstname.lastname@example.org for more information.