Published on December 28, 2008
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 ? http://www.flickr.com/photos/noyespictures/228951299
Pulse tubes now to 2.7K Dryogenic – DMS-1000 system
http://www.flickr.com/photos/andrewmckaskill/16531297 “God hangs the greatest weights upon the smallest wires” Francis Bacon
Don’t build if you can buy
http://www.cmr-direct.com Rewiring a cryostat properly costs less than getting a power socket installed. Do it right and do it only once.
Pumps and plumbing
http://www.flickr.com/photos/arcanegazebo/445426559 / “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
http://www.flickr.com/photos/arcanegazebo/3299089 The dilution fridge – the mainframe of mK machines
Keep it simple, stupid !
Simplicity means achieving the maximum effect with the minimum means. Koichi Kawana http://www.flickr.com/photos/hynkle/2587828754
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 www.cmr.uk.com Cryoconsumables - wiring, connectors etc www.cmr-direct.com Completely Dry systems -Dryogenic Ltd www.dryogenic.com Dr Kurt Haselwimmer Kurt@cmr.uk.com
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