HE-3-TLSL Cryostat - Top Sample Loading, Sample in Liquid
The model HE-3-TLSL cryostat is a top loading system that is designed for fast sample exchange. The sample is located in liquid.
The model HE-3-TLSL cryostat is a top loading system that is designed for fast sample exchange. The design allows the sample to be removed and introduced directly into the He-3 pot while the cryostat is cold. The system includes a sample probe and a load-lock with gate valve, plus an external gas handling system for safe insertion and removal of the sample in and out of the He-3 chamber.
This He-3 cryostat includes the following components:
- Charcoal sorption pump with heater and thermometer
- 1 K pot with thermometer
- He-3 pot (sample chamber)
- Sample probe with thermal anchor stage, thermometer, and heater
- IVC can
- External gas handling system with stored He-3 gas
- External sorption cryo-pump
- Operation test
- Resistive and/or superconducting wires
- Coaxial cables
- Fiber optics
- Clear shot tubing
- Computer controller motorized 1 K pot cryogenic needle valve
- Rotating sample holder
- High efficiency helium dewar
- Automatic temperature controller
- Superconducting magnet
- Magnet support with high current leads
- Magnet power supply
- IVC tail for superconducting magnet
- Liquid helium level probe
- Digital cryogen monitor
- Low eddy current cold finger
- "10 K" radiation shield for operating temperature up to 300 K in full magnetic fields
- Liquid helium transfer line
- 1 K pot pumping station
- Turbo pumping station
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Base temperature: 300 mK
Holding time at base temperature: 24 hours (typical)
Operation temperature range: 0.3 K - 80 K (300 K optional)
Sample space: 0.5" - 1.5"
Top-loading He-3 Cryostat and Variable Temperature Insert Designed to Fit 32 mm Room Temperature Bore Magnet
Janis Research Company is proud to announce the development of a top-loading He-3 cryostat with sample in He-3 liquid, as well as a variable temperature insert with sample in He-4 vapor. These cryostats were designed to fit a 32mm room temperature bore magnet at the National High Magnetic Field Laboratory (NHMFL) in Tallahassee, Florida, with a maximum sample space of 17mm.
NHMFL scientists have used these cryostats to study the Fermi surface of alpha-Uranium via quantum oscillations. The shape of the Fermi surface can be reconstructed by measuring the deHaas-vanAlphen oscillations in the magnetization as the field is swept over the sample. These oscillations were measured as a function of angle of the applied field and temperature. Measuring the temperature dependence of the oscillations can determine the effective masses of the electrons, which is a measure of the level of interaction the electrons have with each other and the crystal lattice.
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