Low Temperature Techniques Course 2008
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Low Temperature Techniques Course 2008

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Presentation given at the Institute of Physics Low Temperature Course 2008, sponsored by Cambridge Magnetic Refrigeration

Presentation given at the Institute of Physics Low Temperature Course 2008, sponsored by Cambridge Magnetic Refrigeration

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Low Temperature Techniques Course 2008 Low Temperature Techniques Course 2008 Presentation Transcript

  • 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
  • Time
  • PhD = 1000 days
  • LT is difficult
  • A Cabinet of Curiosities ? Ole Worm (1588-1654)
  • Helium
  • Another Curiosity ? http://www.flickr.com/photos/noyespictures/228951299
  • Try Dry
  • Pulse tubes now to 2.7K Dryogenic – DMS-1000 system
  • Wiring
  • 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
  • Millikelvin work
  • 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
  • Refrigerant
  • 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
  • http://www.flickr.com/photos/rakkar/574407246
  • 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