Cryogenic accessories

Dewar stand (SVT, VT)

Designed to fit any model SuperVariTemp and VariTemp cryostat, the Dewar stand provides both support and stability to the system.

Adjustable position mounting flange

Designed to fit our detachable tail Dewars up to 11 in in diameter.

Ladish to NW flange adaptor

Contact Janis for more information. This ladish equipment part number is LE/NW(XX)LA(X.X); please specify NW size (XX) and ladish size (X.X).

NW-25 port for standard instrumentation skirt

This image shows an adaptor with an NW-25 port for a standard instrumentation skirt. This adaptor allows a customer to connect a larger evacuation valve to just about any Janis cryostat, or they can connect a vacuum pump directly to this NW-25 port. This will result in a faster evacuation time and could result in higher overall vacuum, depending on the vacuum pump used by the customer.

Ladish to conflat adaptor

The image on the left shows a conflat flange/ladish flange adaptor that allows an ST-100 to be installed on a UHV chamber with a 2.75 in conflat flange. Please note that while this is the easiest way to put an ST-100 onto a UHV chamber, the ST-100 will not be UHV compatible.

The image on the right shows an adaptor with a 3 in Ladish flange on one end and a 4.5 in rotatable conflat on the other end. It can be used to connect a standard ST-100 (with a 1.75 in OD radiation shield) to a UHV chamber through a 4.5 in conflat port.

VPF to FHT-ST liquid helium transfer line adaptor

The images show a special adaptor that allow a VPF liquid nitrogen cryostat to be used with a model FHT-ST liquid helium transfer line.

The VPF is normally a liquid nitrogen only cryostat. This special adaptor allows customers to run their existing VPF with liquid helium by connecting a standard inventory FHT-ST line to the fill port of the VPF cryostat. The base temperature is then extended to ~10 K. Purchasing an adaptor and a standard FHT-ST can be more cost-effective than purchasing a complete ST-100 cryostat.

Inlet tube adaptor for liquid nitrogen storage Dewar

The images show liquid nitrogen storage Dewars with optional inlet tube adaptors attached.

Araldite

Araldite general purpose epoxy.

Versamid/DER

Versamid/DER cold window epoxy.

8, 10, or 19-pin electrical feedthroughs

The photo on the left shows an electrical feedthrough mounted on a square flange and an air-side mating connector. The mating connector is shown assembled, as well as disassembled from the strain relief backshell for soldering of cable to connect your cryostat to external equipment. Contact Janis Research if you are interested in us making the cable.

32-pin electrical feedthroughs

The photo shows a 32-pin electrical feedthrough mounted on a square flange, and an air-side mating connector, shown assembled. This is the largest multipin feedthrough that will fit on most standard Janis instrumentation skirts.

BNC electrical feedthroughs

Used for connecting coaxial cable inside a Janis cryostat. Available on aluminum (electrically conductive) flange or Nylon/G-10 (electrically isolating) flange. Available in double-sided (jack-to-jack) connection with female BNC jacks on both sides. Available with female BNC jack on the outside and solder connection on the inside. Use for low-frequency measurements from DC to below 3 GHz with proper cables and connections.

The photos to the left show (left to right) a disassembled BNC electrical feedthrough, a double BNC electrical feedthrough on an aluminum flange, a double BNC electrical feedthrough on a nylon flange, and a jack-to-jack BNC feedthrough. Contact Janis for more information.

SMA electrical feedthroughs

Used for connecting coaxial cable inside a Janis cryostat. Available on aluminum (electrically conductive) flange or nylon/G-10 (electrically isolating) flange. Available in double-sided (jack-to-jack) connection with female BNC jacks on both sides. Available with female BNC jack on the outside and solder connection on the inside. Use for low and high-frequency measurements from DC to 18 GHz with proper cables and connections.

The photos to the left show (left to right) a disassembled SMA electrical feedthrough; a double SMA electrical feedthrough on a custom large aluminum flange; a double SMA electrical feedthrough on a custom large nylon flange; a double jack-to-jack SMA feedthrough on a G-10 flange; and a triple SMA electrical feedthrough. Contact Janis for more information.

Triaxial electrical feedthroughs

Janis uses Trompeter BJ78HS female jack-to-jack hermetic feedthroughs. Available on aluminum (electrically conductive) flange or Nylon/G-10 (electrically isolating) flange. Used for guarded measurements.

The photo on the left shows a disassembled triaxial electrical feedthrough. Contact Janis for more information.

Thermocouple feedthroughs

Available in single and double thermocouple feedthroughs. Designed to introduce a thermocouple with a 0.020 in or 0.063 in diameter sheath into a Janis cryostat. Includes an aluminum support bracket to protect thermocouple from damage.

The photo to the left shows a double thermocouple feedthrough and the photo to the right shows a special thermocouple feedthrough for small diameter thermocouples. Contact Janis for more information.

Window fiber feedthroughs

Designed for introducing an optical fiber or gas line into the sample area through a window port. This feedthrough is an o-ring compression seal and it can form a vacuum-tight connection around most standard tubing sizes 1/16 in diameter or larger.

This photo shows a window fiber feedthrough. Contact Janis for more information.

Break-out boxes

Janis Research break-out boxes are available for use on just about every Janis system except UHV cryostats. Break-out boxes are custom-built and allow us to install multiple electrical feedthroughs on a single port of an instrumentation skirt. Customers may specify the type and quantity of feedthroughs. Contact us to find out if a break-out box is an available option for your requirements.

Adaptor — Ladish-Conflat

This image shows an adaptor with a 3 in Ladish flange on one end and a 4.5 in rotatable conflat on the other end. It can be used to connect a standard ST-100 (with a 1.75 in OD radiation shield) to a UHV chamber through a 4.5 in conflat port.

Adaptor — NW-25 feedthrough

This image shows an adaptor with an NW-25 port for a standard instrumentation skirt. This adaptor allows a customer to connect a larger evacuation valve to just about any Janis cryostat, or they can connect a vacuum pump directly to this NW-25 port. This will result in a faster evacuation time and could result in higher overall vacuum, depending on the vacuum pump used by the customer.

Apiezon N

Apiezon N low vapor pressure vacuum and thermal anchoring grease (25 g). Please visit the Apiezon web site for specifications.

Krytox

Krytox low vapor pressure thermal anchoring grease (2 oz tube). Visit the DuPont web site for more information on Krytox low vapor pressure high-vacuum grease.

Celvacene

Celvacene Light general purpose vacuum grease (4 oz jar).

Specifications for Celvacene Light grease:

• Vapor Pressure: 10^-6 Torr
• ASTM Minimum Melting Point: 90 °C
• ASTM Penetrometer: 120 to 190

CryCon

CryCon copper-filled thermal grease (1 oz jar)

Specifications for CryCon grease:

• Thermal conductivity (W/m·K): 0.1 at 4.2 K, 0.03 at 2 K
• Suggested maximum temperature: 100 °C

Ladish flanges, gaskets, and clamps

The photos show blank stainless steel flanges, ladish gaskets, and clamps. Standard sizes include 1.5 in, 2.0 in, 2.5 in, 3.0 in, and 4.0 in.

The size of a Ladish flange is determined by the maximum size of the outer diameter of the tube to which it is connected. The actual diameter of the flange itself is larger than the tube diameter. In other words, a 3 in Ladish flange is not 3 in in diameter. The flange is actually 3.58 in diameter. Note that Janis often welds tubes smaller than the maximum possible diameter into Ladish flanges. For example, we may weld a 2 in OD tube into a 3 in Ladish flange, so the tube diameter on your Janis system may not necessarily indicate the correct Ladish flange size.

Standard (resistivity, optical, blank)

Three standard sample holder styles are stocked at Janis for quick delivery, as shown. In addition, custom-designed holders can be fabricated to match almost any special requirements, including LCC and DIP packages (see list below).

Cuvette

The photo on the left shows a cuvette sample holder for installation on an optical VNF-100. It is compatible with all 12.5 mm wide × 12.5 mm deep cuvettes such as the Starna models 1-G-10, 1.7-G-10, 1-SOG-10, 1-Q-10, and 1-I-10.

The photo to the right shows a special cuvette sample holder. No tools or disassembly are required to remove or install this cuvette. The user just pushes the spring-loaded G-10 plunger upwards, places the cuvette in the bottom flange, and the plunger will hold it in place when it is released.

Diamond anvil cell (DAC)

This image shows a diamond anvil cell (DAC) sample holder designed for integration with a Janis model PTSHI-4-5 pulse tube cooled 4 K closed-cycle refrigerator system. The general design can be used on any system (sample in vapor and sample in vacuum) with a sufficiently large sample area. The sample holder shown here was designed to fit an easyLab OmniDAC membrane-style diamond anvil cell.

Dual inline pin (DIP) Socket

Special dual inline pin (DIP) socket sample holders are shown. The photo on the left shows the DIP socket sample holder with a customer-supplied chip socket installed. DIP socket sample holders are usually used in sample-in-vapor systems, but the sample holder shown was built for installation on a 500 K ST-100 continuous flow cryostat. It can also be used in a VPF-100 liquid nitrogen pour fill cryostat. Both the ST-100 and VPF-100 have their samples in vacuum.

This photo shows a special sample positioner with a dual inline pin (DIP) socket sample holder and some coaxial cables installed.

The zero insertion force (ZIF) dual inline pin (DIP) socket sample holder lets you drop the DIP carrier in and push down the lever to hold it in place. It is designed for use in exchange gas only.

Fixed probe

Janis Research offers sample holders with fixed-position tungsten probes installed for the electrical measurement of samples without the need for permanent contacts. This design is suitable for measurements in temperatures as high as 800 K and may be ordered wired to the feedthrough type of your choice, including multi-pin, BNC, or SMA feedthroughs. Originally designed for DLTS applications, the sample holder is suitable for any kind of measurement where permanent electrical contacts are undesirable.

The photograph to the left shows a sample holder set up for four-point measurements. A non-electrically conductive mounting surface is provided and the probes have a limited range of movement for fine-scale positioning when the sample is warm.

This sample holder may be used with any of our standard laboratory cryogenics products, in particular the VPF-800, ST-100, and CCS-450.

Contact Janis today for further details and pricing information.

Leadless chip carrier (LCC)

Special holders for LCC chips are available for use in most Janis cryostats. Contact Janis for details.

Shown is a 68-pin LLC socket with 64 total phosphor-bronze wires connected to the socket. The back-side picture shows the wires installed to the chip receptacle. The front-side picture shows the customer's LLC socket installed in the receptacle. This particular sample holder was installed on an STVP-200 system.

This leadless chip carrier sample holder is shown without the chip installed.

Special compact three-position

The images show a quite standard three-position sample holder (left) and a special compact three-position sample holder (right). Such sample holders are typically used in conjunction with a precision sample positioner in an FTIR system. Contact Janis for more information.

Special resistivity

Special sample holder with electrically isolated pins.

Customer-designed

The example of sample holders shown on the left was made according to customer-supplied drawings. The sample holder shown on the right required a special, larger vacuum shroud. Our sales engineers will work with you to design the system you need for your experimental requirements.

Double rotating

Janis now offers special sample positioners with the ability to rotate the sample about the optical axis of the cryostat.

Janis sample positioners have long been able to rotate around the cryostat axis, and now with the addition of a gear mechanism close to the sample, samples may be rotated about an axis perpendicular to the cryostat axis. Different configurations are available, depending on the individual requirements of the user. The photograph to the left shows a sample holder with the flat mounting surface perpendicular to the axis of rotation. Sample holders with the flat mounting surface parallel to the axis of rotation are also available.

The standard double-rotating sample mechanism fits inside a 1.5 in diameter sample tube. Optional non-magnetic bearings are also available, allowing sample rotation inside a magnet system with a 1.75 in diameter sample tube.

These special sample positioners are available with any system with the sample in flowing vapor or exchange gas. They may also be ordered for use with existing cryostats.

Contact Janis for more information.

Precision rotator for He-4 and He-3 cryostats

For applications that require rotation of the plane of the sample relative to a vertical magnetic field, Janis Research also offers two options. The first one offers continuous rotation of the plane of the sample, and the second one offers a precision rotation, typically up to 100 degrees. The precision rotator is also offered for inserts where the sample is located in vacuum. These sample rotators can be supplied for both non-optical as well as optical systems.

Precision sample positioner with a special compact 3-position sample holder

The precision sample positioner shown was used for an STVP-100-FTIR. Contact Janis to discuss your application with a sales engineer.

Special sample positioner with DIP socket sample holder

The photos show a special sample positioner with a dual inline pin (DIP) socket sample holder and some coaxial cables installed.

See Sample positioners: Double rotating or Precision rotator for He-4 and He-3 cryostats

Please see the Sample positioners section for double rotating or precision rotators for He-4 and He-3 cryostats.

Vacuum shroud with LF-100 flange

This photo shows a model VPF-100 liquid nitrogen pour fill cryostat with a special vacuum shroud. The vacuum shroud has an LF-100 flange to mate with a port on the customer's existing vacuum chamber. This flange can be offered on many systems including SuperTran continuous flow cryostats and closed-cycle systems.

Standard window block with countersunk screw holes

Janis Research usually uses pan-head screws on the retainers of window blocks, which add about 0.125 in to each side of the window block. In cases where 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.

Bottom window

The image displayed is of an inventory ST-100 with a fifth bottom window. This option is available on most optical, sample in vacuum systems, including models ST-100, VPF-100, CCS-150, CCS-100/202, and CCS-100/204.

See our window transmission curves page. Contact Janis to discuss window options for your cryostat.

Mylar window

Most commonly used on systems for Mössbauer (gamma-ray) spectroscopy and x-ray spectroscopy. Available only in thin film/sheet. Aluminized mylar is available for use on radiation shield window ports.

This photo shows a mylar window on a system for Mössbauer spectroscopy.

See our window transmission curves page. Contact Janis to discuss window options for your cryostat.

PE or KRS-5 outer windows

Commonly used in IR spectroscopy on systems with rotatable vacuum shrouds. KRS-5 covers transmission in the near-to-mid IR range, while Polyethylene (PE) is used for transmission in the far-IR range.

This photo is from a system window block with Polyethylene (PE) outer windows in one axis and KRS-5 windows in the other axis.

See our window transmission curves page. Contact Janis to discuss window options for your cryostat.

ZnSe or polyethylene outer windows

This photo is from an STVP-100-FTIR window block with ZnSe outer windows in one axis and Polyethylene windows in the other axis.

See our window transmission curves page. Contact Janis to discuss window options for your cryostat.

Re-entrant window

This photo shows a re-entrant window that was used for a VPF-100.

See our window transmission curves page. Contact Janis to discuss window options for your cryostat.

Coaxial wire

This photo shows coaxial wire. Contact Janis for more information.

Indium wire

This photo shows indium wire. Contact Janis for more information.

Phosphor-bronze quad ribbon

This photo shows 32 AWG phosphor-bronze quad ribbon. Contact Janis for more information.

Phosphor-bronze twisted-pair wire

This photo shows 32 AWG phosphor-bronze twisted-pair wire. Contact Janis for more information.

Triaxial wire

This photo shows triaxial wire. Contact Janis for more information.

Teflon insulated stranded copper wire

This photo shows Teflon insulated stranded copper wire. Contact Janis for more information.

8-triaxial break-out box

This photo shows an 8-triaxial break-out box. Contact Janis for more information.

Gas introduction port

This photo shows a gas introduction port. Contact Janis for more information.

O-ring compression seal

This photo shows parts of a quick disconnect, otherwise known as an o-ring compression seal.

Do you need an o-ring compression seal for an LHe storage Dewar?

If your transfer line has a 1/2 in diameter leg, you will need the following parts:

• 1/2 in nut: Part #1010107, reference #S-50-N
• 1/2 in retaining ring: Part #1010207, reference #S-50-R
• #014 o-ring: Part #0601014, reference #2-014-OB

If your transfer line has a 3/8 in diameter leg, you will need all of the parts above plus the part below:

• 3/8 in thin-wall o-ring compression seal assembly: Part #1000108, reference S-38-KM

Reference:
3/8 in nut: Part #1010106, reference #S-38-N
3/8 in retaining ring: Part #1010206, reference #S-38-R
#012 o-ring: Part #0601012, reference #2-012-OB

Please purchase these parts directly from A&N Corporation.

Heater kits

Janis Research has heater kits for 325 K and 500 K available. The photo to the left shows a 325 K heater kit. Contact Janis for more information.

Radiation shield

This image shows a special radiation shield installed on the sample mount of a VPF-800 cryostat. In principle, this can be installed on most sample-in-vacuum systems. The design keeps the radiational heat load around the sample at the same temperature as the sample mount. This gives a more uniform sample temperature over the entire operating range of the system.