IOP Low Temperature Techniques Course 2008

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Information about IOP Low Temperature Techniques Course 2008

Published on December 28, 2008

Author: kurt.haselwimmer



Institute of Physics Low Temperature Techniques Course 2008 - presentation by Dr Kurt Haselwimmer

Notes to a Low Temperature Physicist or, what I wished I'd have known when I started LT Techniques course, 26th Nov 2008 Dr Kurt Haselwimmer Cambridge Magnetic Refrigeration


PhD = 1000 days

LT is difficult

A Cabinet of Curiosities ? Ole Worm (1588-1654)


Another Curiosity ?

Try Dry

Pulse tubes now to 2.7K Dryogenic – DMS-1000 system

Wiring “God hangs the greatest weights upon the smallest wires” Francis Bacon

Don’t build if you can buy Rewiring a cryostat properly costs less than getting a power socket installed. Do it right and do it only once.

Pumps and plumbing / “A vacuum is a hell of a lot better than some of the stuff that nature replaces it with” Tennessee Williams

• Always clean and grease o-rings • Only Use Viton O-rings – buna-N cracks • Paint your KF-fittings • Don't use poppet relief valves on vacuum cans • Always boil-off flux on HS joints • Buy SS flexibles from Kurt J Lesker • Use plastic KF clamps from BOC edwards • Use only bellows sealed valves on He-3

Millikelvin work The dilution fridge – the mainframe of mK machines

Keep it simple, stupid !

Simplicity means achieving the maximum effect with the minimum means. Koichi Kawana

Entropy, S Temperature

Entropy, S B min = 0.1 T B max = 6T Temperature T MIN <50mK T BATH = 4.2K, 1.5K


Entropy, S B min = 0.1 T B max = 6T Temperature

Superconducting Magnet Refrigerant

Entropy, S B min = 0.1 T 1 B max = 6T Temperature T BATH = 4.2K, 1.5K

Bath Thermal Contact Superconducting Magnet Refrigerant Pill

Entropy, S B min = 0.1 T 1 B max = 6T 2 Temperature T MIN <50mK T BATH = 4.2K, 1.5K

Bath Heat Switch Superconducting Magnet Refrigerant Pill

Connection to Bath Heatswitch Sample Region (Double axis rotator) Refrigerant Practical Refrigerators

a LT is difficult

Cambridge Magnetic Refrigeration Cryoconsumables - wiring, connectors etc Completely Dry systems -Dryogenic Ltd Dr Kurt Haselwimmer

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