Top loading 3He refrigerator, HelioxTMTL

A HelioxTL system consists of :

• An insert - including the sorb, the 1 K pot and the 3He pot
• A probe or combination of probes (experimental access and wiring)
• External 3He dump

Options:

•   A range of non-standard top-loading probes
•  Pumping manifold for 1 K pot (rotary pump, pumping lines, vacuum valves and gauge)
•  Calibrated ruthenium oxide sensors on the 3He pot
•  80K high temperature option

Solution to helium rising costs:

The Heliox TL 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.

The sample is mounted onto the top-loading probe and inserted directly into the 3He liquid through the central access of the insert. A vacuum lock allows the sample to be inserted and withdrawn without loss of 3He or entry of air into the sample space.

When the probe has been inserted, the sorb is warmed to over 30 K. This recondenses the 3He gas on the 1K pot assembly which runs down to cool the sample. At this stage the sample is surrounded by 3He liquid at approximately 1.2 K. The sorb is then cooled, and it begins to reduce the vapour pressure above the liquid 3He to decrease the sample temperature. The minum temperature possible in this type of refrigerator is approximately 250 mK with no experimental heat load.