System Name | 7T VF | 9T HF | 10T VF | 11T VF | 15T VF |
---|---|---|---|---|---|
Inductance (H) | 35.2 | 32.0 | 34.4 | 200.5 | |
Persistence swtich I(mA) | N/A | 18 | N/A | 64 | 65.2 |
Non-Lambda Field (T) | 7 (12.850 A/T, 90 A) | 9 (13.211 A/T, 118.9 A) | 10 (11.078 A/T, 110.8 A) | 9 (9.827 A/T, 88.4 A) | 10 (7.682 A/T, 76.8 A) |
Lamba Field (T) | N/A | N/A | N/A | 11 (108.1 A) | 14.853 (114.1 A) |
Temperature Range (K) | 0.3 - 325 | 2.0 - 325 | 0.05-100 | 0.05 - 30 | 0.05 - 300 |
Max Sample Diameter (mm) | 71 | 28.5 | 25, 50(bottom load) | 15, 10 (dilution insert) | |
Horiz. Angular Access (degrees) | 340 | N/A | 340 | 340 | |
Split (mm) | 26 | 43, (94 bore diameter) | 35 | 20 | |
Taper (degrees) | 0 | Opening Angle Bore: +/- 5° Split: +/- 3° |
0 | +/- 2° | |
Available Instruments (max fields) | BT1(7), BT7(7), SPINS(7), Reflectometers(7) | NG3(9), NG7(9), BT5(TBD) | BT1(2.75), BT7(10), MACS(5T@3.6meV,4.3T@2.5meV),DCS(10), SPINS(10) | BT7(11.5), DCS(11.5), SPINS(11.5), MACS | BT7(15) |
lambdaoption is available, additional cooling to ~2.2 K is possible.
Persistent Switch (PS) Schematic The PS is comprised of a resistive heater in thermal contact with a segment of superconducting wire that is connected in parallel with the magnet solenoid (M). When the heater is energized with a small current (~ 50mA), the wire segment becomes resistive and a voltage may be applied across M, allowing it to be energized/de-energized. When the persistent switch heater is turned off, the wire segment goes into the superconducting state and shorts the magnet. The external current source may then be run downwhile the superconducting current in the magnet persists. |
A split-coil SCMag with independent solenoids (M1 and M2) and
persistent switches (PS1 and PS2) . Here, the center tap (CT) is used for independent control of M1 and M2 (asymmetric mode). For symmetric operation, one may connect the solenoids in series and persistent switches in series (no connection is made at CT). Note that not all magnets are capable of operating in asymetric mode. |