Integrated Cryofree dilution refrigerator and magnet system

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Oxford Instruments has achieved the world's first 15 T integrated Cryogen-free dilution refrigerator and magnet system!

•  Base temperature:   ≤ 7 mK expected
• 15 T central field
• Cooling power ≥ 200 or 400 µW at 100 mK
• Magnet ramps from zero to 15 T in less than 30 minutes
• Modular design with interchangeable inserts: dilution refrigerator, 3He system, VTI for maximum flexibility
• Automatic control of the dilution refrigerator from RT to base temperature

• One single Pulse Tube Cooler with vibration isolation at 4 K and 70 K

• Easy and reliable sample access : via only one  O ring sealed vacuum space, no IVC

• Load-lock mechanism for fast sample change

• Split shields to allow full sample region access

Oxford instruments published an article in Cryogenics on the integration of superconducting magnets with cryogen-free dilution refrigerator systems.

Download the article here >>

• Typical specifications 
• Sample configuration 
• Recently shipped units 
• Photos 
•  

Dilution refrigerator specifications
Base temperature	≤ 10 mK
Temperature control of sample	up to 30 K with magnet at full field
Cooling power	> 200 or 400 µW at 100 mK
Cool down time ( from RT to 100 mK)	30 hours for 12 T magnet 50 hours  for 15 T magnet
Sample change time using vacuum load-lock sample holder	≤ 8 hours for sample turnaround and cooling back to 100 mK
Magnet specifications
Field orientation	Vertical
Central field	up to 15 T in dilution refrigerator
Central field homogeneity	0.1 % over a 10 mm diameter spherical volume
Field stability in the persistent mode	Typically < 0.01 % relative hr-1 measured at 15 T
Cold bore diameter	57 mm clear
Wiring options
24 way constantan/copper/supercon loom 4, 8, 12 off S1 or UT85 coax 3, 6, 10, 20 dB attenuators fitted at PT1, PT2 and Still temperatures Custom wiring available

Low temperature insert	Low vibration Pulse Tube Refrigerator and compressor Independent precool loop Kelvinox dilution unit 2 x NW40 Line of site ports 1 x NW50 Line of site port 240 mm diameter x 240 mm length sample space Diagnostic thermometry Plain tail
Gas Handling system	Fully automatic gas handling Software control Turbo pump Dry rotary pump Condensing line compressor Electrical isolation
Superconducting magnet	3 T, 77 mm cold bore 8 T, 57 mm cold bore 12 T, 57 mm cold bore 15 T, 57 mm cold bore 0.1% homogeneity over 10 mm DSV Superconducting switch available Quench protection circuit HTS current leads Vector rotate magnets available on request
Optional items	1W Pulse Tube Refrigerator Remote rotary valve Remote pumping station LN2 precool loop Optical tails X-Ray or Neutron tails Tails to suit room temperature bore magnet system DC & RF customer wiring RF heat sinking Sample thermometry

 Oxford Instruments has now delivered nine integrated dilution refrigerator and magnet cryofree systems. Six of those have already been installed. All systems have met or exceeded factory specifications. See details below.

Country	Shipment	Magnet	Base temperature	Cooling power (@100 µW)
Germany	November	VR2/0.2/0.2	7.3 mK	400 µW at 93.5 mK
USA	July 2009	0.3 T split pair	8.0 mK	200 µW at 83 mK
USA	July 2009	8T	12 mK	250 µW
USA	April 2009	8 T	7 mK	400 µW
USA	March 2009	0.3 T split pair	8.5 mK	240 µW
UK	March 2009	12 T	8.5 mK	250 µW
Switzerland	March 2009	5 T	7.1 mK	235 µW
Australia	March 2009	5 T	7.5 mK	300 µW
Canada	March 2009	8 T	8.7 mK	250 µW
USA	March 2009	3 T	6.8 mK	250 µW