"Wet" Helium-3 Ultra Low Temperature Systems
The widest range of helium-3 inserts available on the market.
Buy as a complete system integrated together with a liquid helium dewar and superconducting magnets, or as a stand-alone insert for integration to your existing equipment.
Product Category Features
With more than five decades of experience and a worldwide installation base, JanisULT is a recognized leader in the design and manufacture of He-3 ultra low temperature systems.
We offer the widest range of standard helium-3 designs available, meaning we most likely already have a design that is suitable for your application.
JanisULT's staff of physicists and engineers has extensive experience in the design and operation of ultra-low temperature systems and is uniquely qualified to assist you with every step of your system purchase, from experimental design through post-installation support. Take a browse through our product information below, and get in touch with any questions you have.
He-3 Magnet Systems
Helium-3 systems with integrated magnets provide 0.280 K temperatures, with a choice of sample in vacuum (on a cold-finger), or immersed in liquid He-3
Standard loading, sample in vacuum
Standard loading - sample in vacuum for storage dewar
Standard loading, sample in exchange gas
Standard loading, optical, sample in vacuum
Standard loading, optical, sample in vacuum for FTIR experiments
Standard loading, compact, sample in vacuum
Standard loading, sample in vacuum, continuous flow
Top sample loading, sample in liquid
Top sample loading, sample in liquid, optical
Top sample loading, sample in liquid for nuclear magnetic resonance (NMR)
Top sample loading, sample in vacuum for neutron scattering applications
Gas Handling Systems
The gas handling system (GHS) is designed to operate helium-3 cryostats models with top-loading into liquid
Helium-3 inserts: how they work, and how to select the right design
The basic principle of a He-3 cryostat is to condense He-3 gas by bringing it in contact with a pumped He-4 reservoir (1 K pot) or with a cryocooler.
Low temperatures below 300 mK are then generated by reducing the vapor pressure on top of the liquid He-3 reservoir with either an internal (sorption) or an external pumping system. This may be done in a continuous flow mode or in a single shot mode.
Continuous flow operating systems provide much higher cooling power, but are generally more costly and require customized designs that are highly application dependent. If such a system is needed, please feel free to contact us and discuss these systems with our ultra low temperature physicists and engineers.
These product pages listed below highlight the various standardized types of long term operating single shot systems with very quick regeneration times.
Single shot type He-3 cryostats typically include an internal sorption pump (SP), which offers very high pumping speeds for reducing the pressure on top of the He-3 reservoir, without requiring any costly external sealed pumps. This charcoal SP is integrated within the He-3 insert and its pumping speed controlled by controlling its temperature between approximately 4 K and 40 K.
A specific amount of He-3 gas is supplied with each system, and is either permanently stored inside the insert (sample in vacuum), or externally stored in a separate volume (sample in liquid He-3). This gas is condensed at the 1 K pot (or the He-3 condenser in a cryogen-free He-3 system) with the SP off, then its temperature is decreased by turning the SP on. The He-3 reservoir is then quickly cooled down below 300 mK, depending on the configuration and intrinsic heat load of the experiment.
The cooling power of these systems is also dependent on the type of system (sample in vacuum, exchange gas or LHe-3), and on other required features such as windows or other external variables dictated by the specific experiment.
When defining the system that is best suited for a specific application, one can concentrate on the following choices:
- Sample loading: Standard loading, top loading or bottom loading
- Sample location: High/ultra high vacuum, He-3 exchange gas, or He-3 liquid
- Dewar type: Research type or storage helium dewar
- Vacuum can seal: Indium wire or taper seal
- Pre-cooling: LHe-4 or cryocooler
- Operation mode: Single shot or continuous flow
- Options: Magnet, rotating sample holder, optical windows or fiber optics, sliding seal, wiring, coaxial cables, etc.
Specific designs have also been developed for a variety of optical and non-optical experiments. These include a very wide range of applications such as Quantum Hall Effect, X-ray and Neutron studies, de Haas van Alphen measurements, material surface studies requiring cooling of Scanning Probe, Near Field Optical and Atomic Force Microscopes.