THelium-3-refrigerator-without-1-K-pot-HelioxVT-(3).jpghis sample-in-vacuum 3He refrigerator achieves less than 300 mK for more than 40 hrs and achieves 50 µW of cooling power at 350 mK for over 6 hrs.

As it uses the cold gas environment of the VTI (with 30 or 50 mm access), there is no need for a 1 K pot on the insert. This provides two key benefits:

  • The sample temperature range of a new or existing VTI can be extended below 280 mK
  • There is no liquid helium in the sample horizontal plane making the Heliox®VT ideal for neutron or X-ray scattering experiments

Download the Heliox brochure here.

Specifications

Sample environment Vacuum
Sample space 25 mm sample space for VT30, 43 mm sample space for VT50
Base temperature ≤ 300 mK for ≥ 40 hours
Maximum temperature 1.2 K as standard.  Higher temperature option available: up to 300 K
Cooling power (with standard radiation shields) 50 µW at ≤ 350 mK for 6 hrs
Temperature stability ± 3 mK at T ≤ 1.2 K
Thermometers Uncalibrated RuO2 sensors on the 3He pot and the 1 K plate, resistance sensor on sorption pump
3He regeneration time 40 min
Liquid helium consumption (typical) Consumption of the VTI 100-150 cc/hr
Sample access Brass IVC with greased cone seal
Cryogenic service interval N/A
3He Not included

 

System components/options

A complete system consists of:

  • HelioxVT insert
  • Temperature controller to operate the refrigerator
  • A variable temperature insert (VTI) with pump and temperature controller

Options:

  • Sample holder for high field magnet
  • Spare IVC tail, to suit magnet if required
  • VTI
  • High temperature option

The HelioxVT is compatible the IntegraAC, recondensing liquid helium cryostat.

This product has been developed to significantly reduce the consumption of liquid helium by recondensing helium gas evaporated within the system, which would other wise be vented from the cryostat. This decreases the frequency of helium refills. Cryogenic systems can be kept cold continuously, even when in stand by mode, leading to greater freedom to schedule experimental time.

IntegraAC-recondensing-dewar-compability-sketch.jpg

Operation

The figure below represents a schematic of the HelioxVT running in a VTI. The HelioxVT insert can be treated like any sample rod for a variable temperature insert. Once loaded, the insert is cooled by the VTI from 300 K down around 10 K using exchange gas. The 3He gas contained in a small dump sitting on top of the insert is then condensed at around 1.5 K. Once the 3He pot has reached a stable temperature and condensation is completed, the adsorption pump will start to cool the 3He pot and experimental set-up to below 300 mK. The condensation and the cool down time typically require less than 1 hour.
 

HelioxVT-operating-principle-(1).jpg

Applications

Semiconductors Quantum Hall effect
Quantum dots
Single electron tunnelling
Quantum computing
Magneto-resistance
Hall effect
RF transport
High frequency conductivity
Solid state physics Heavy fermion systems
Metal insulator transition
Spin glass
Mesoscopic systems
Giant magnetic resistance
Specific heat
De Haas-van Alphen oscillations
Solid state NMR
Electrical resistivity
Magneto-resistance
Neutron scattering
Superconductivity Low Tc superconductors
Quantum computing
Josephson junctions
Flux vortices
Quantum initial phenomena
Electrical resistivity
Scanning spectroscopy (STM/AFM)
Squids
AC susceptibility
Astrophysics & cosmology Low temperature detectors
Superconducting tunnel junctions
Ge bolometers
Electrothermal measurements
Voltage biased measurements
Low energy photon detection
Metrology Quantum hall effect
Voltage standards
Current standards
Magneto-resistance
DC & AC low frequency transport and magnetic measurements
Single electron tunnelling

 

Related Products

Standard dilution refrigerator - KelvinoxMX

Standard dilution refrigerator - KelvinoxMX

Dilution refrigerator for multi experiments - KelvinoxMX

Cryofree dilution refrigerator - Triton

Cryofree dilution refrigerator - Triton

The Triton family of Cryofree dilution refrigerators has led the way in ultra low temperature experiment-readiness with its leading-edge superconducting magnet integration, sample loading mechanisms, and sample wiring options.

Cryofree extra large dilution refrigerator - TritonXL

Cryofree extra large dilution refrigerator - TritonXL

The Cryofree TritonXL range of dilution refrigerators enables higher cooling power, more sample space and achieves colder base temperatures than any other cryogen free dilution refrigerator on the market (3.3 mK has been demonstrated).

Cryofree custom Triton dilution refrigerators

Cryofree custom Triton dilution refrigerators

The modular design of the Triton offers extensive configuration possibilities and flexible sample environments. Some of the options include integrated and remote motor PTRs; large sample space; integrated superconducting magnets up to 18 T; top and bottom sample loading into vacuum; extensive wiring and service options as well as vacuum tail sets, to suit any applications.

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