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7T VF dry
This cryogen-free superconducting magnet is cooled by two closed-cycle refrigerators and has three available Inserts:
- Dilution Refrigerator (50 mK to 100 K)
- 3He Dipper (300 mK)
- High Temperature Stick (1.5 K to 700 K)
This is a large and highly complex system, and planning for experiments must begin well in advance of beamtime to determine compatibility. Instrument must support 2X 60A compressors.
The cart cannot be transported through doorways or lifted on the crane with the sample inserted.
Cart dimensions when fully assembled are (LWH) 3319 mm X 830 mm X 2042 mm.
Instrument Compatibility:
BT7: | approved to use |
BT9: | pending force test |
DCS: | approved to use |
NG7SANS: | pending force test |
Magnet Properties:
Manufacturer | Cryogenic LTD |
Max Field | ±7 Tesla with smooth ramping through zero field |
Field Calibration | 27.429 A/T, 192 A @7T |
Coils | Nb3Sn, split-pair, Vertical field, symmetrical |
Homogeneity | .19% over 10 mm DSV, 0.75% over 20 mm DSV |
5-Gauss Radius | R: 1.72 m, Z: 2.17 m |
Persistent Switch | No |
Clear split | 35 mm height |
Dark Angle | 40 Degrees |
Optimum Sample Height | 20 mm |
Vertical Divergence | ±4 degrees |
Maximum System Tilt | 5 degrees |
Direct Beam Option | Injection/Exit holes 35 mm x 40 mm, 180 degrees apart |
Asymmetrical operation | A 10% difference in current between the upper and lower coils is available at 7.0T central field. This is accomplished by lowering one coil by 5% and raising the other by 5%. At 5 T or below this can be raised to 15%. |
Movement Stage Specifications:
Manufacturers | Aeroteck ALAR100LR Racaw N0S097AB |
Stick rotation travel | ±180 degrees *limit flags applied |
Stick rotation angle accuracy | ±2 arcsec |
Resolution | 0.02 arcsec |
Repeatability (Unidirectional) | ±1 arcsec |
Stick rotation backlash allowable | ±0.5 arcsec |
Bidirectional repeatability | ±0.5 arcsec |
Vertical adjustment range | ±7.5 mm |
Dilution Refrigerator Insert Specifications:
Manufacturer | Cryogenic LTD |
Cooling power at 100mK | 60 µW |
Base temperature | 50 mK |
Maximum working temperature | 100 K |
Sample cooling time for DR (to 4K) | 8 hours |
He-3 Fridge Insert Specifications:
Manufacturer | Cryogenic LTD |
Minimum controlled sample temperature | 300 mK |
Maximum controlled sample temperature | 150 K |
Hold time at base temperature | 50 hours |
Sample change time (to 4K) | 3-4 hours |
High Temperature Sample Stick Specifications:
Manufacturer | Cryogenic LTD |
Base temperature in VTI | 1.5 K |
Maximum operating temperature | 700 K |
Cooldown time (700 K - 4 K) | 3 hours |
Cooldown time (300 K - 4 K) | 2 hours |
| D | B | L | M |
High Temp Stick at 1.5-300K | 49 mm | 55 mm | 150 mm | 5/16-18 x 10 mm deep |
High Temp Stick at 300-700K | 34.5 mm | 55 mm | 130 mm | 5/16-18 x 10 mm deep |
CL 3He Dipper | 41 mm | 55 mm | 130 mm | 5/16-18 x 9 mm deep |
CL Dil Fridge | 43 mm | 55 mm | 137 mm | 5/16-18 post |
Contacts
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(301) 975-5295