There are 4 DC field superconducting research magnets installed at NHMFL in
Tallahassee.
- SCM1 and SCM2: Two 20 T Oxford Instruments solenoid magnets,
with 50 mm cold bores. One of them has an Oxford dilution refrigerator in it.
The other is used for experiments at >500 mK.
- Magnet specifications:
- Central Field: 18 T at 4.2 K; 20 T at 2.2 K
- Field Homogeneity: 10-3 over a 10 mm diameter sample volume
(DSV) and 4X10-3 over a 20 mm DSV.
- Field Change in Persistent Mode: <5X10-5 per hour
- 30 minute ramp to 18T, 6 min ramp from 18T to 20T
- Dilution refrigerator specifications:
- Base temperature: 20 mK
- Sample volume: 25 mm diameter, 25 mm tall. Sample in the mixture.
- Two top loading inserts are available for this refrigerator, one with a
sample rotator built in.
- SCM 5: One 15 tesla Oxford Instruments magnet with insert for
experiments >4.2K.
- 45 mm cold bore solenoid
- Field Homogeneity - 10-2 over 10 mm DSV.
- 20 min ramp to 8T, 101 min ramp to 15T.
- SCM 6: One 12 tesla Oxford Instruments split coil large bore
magnet. This magnet can be used with the bore either horizontal or
vertical.
- 150mm cold bore solenoid.
- Radial access: 30mm parallel to magnet bore, 70mm perpendicular to magnet
bore.
- 33 min ramp to 8.4T, 66min ramp to 12T
In August 1993, one 19.5
T, 52 mm bore, superconducting magnet (SCM 3) was installed at Los
Alamos to support both pulsed field experiments and dedicated continuous field
experiments. This magnet has an on-axis compensation coil that reduces the
field to 0.15 T in a radius of 150 mm at a distance of 310 to 440 mm from the
maximum field. The compensation coil reduces to near zero effects of the main
field on temperature sensors, optical detectors, etc. placed in the minimum
field zone. A variable temperature insert (1.5 K to 300 K) and a bottom
loading dilution refrigerator are available for users. The minimum temperature
reached by the dilution refrigerator is 10 mK; it maintains 15 mK at 19.5 T.
The sample space is 32 mm diameter for samples in vacuum and 16 mm diameter for
samples in the mixture.
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Curator: Scott Hannahs <sth@magnet.fsu.edu>
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