 |
|
 |
| Nominal rating | 24 MW | 32 MW | 40 MW |
| Voltage | 400 V | 500 V | 500 V |
| Current | 17 kA | 17 kA | 20 kA |
| Maximum rating with four supplies in parallel | 27.2 MW | 34 MW | 40 MW |
| Maximum operating time | indefinite | 12 hours | 1 hour |
Considerable effort has gone into limiting ripple and noise in the magnets by tuning and controlling internal noise in the active filter/regulators and by designing the magnet cooling water system and magnet housings for minimum vibration. The results so far are as follows:
Ripple and noise (2-2500 Hz): <10 ppm Instability, (0-2 Hz): <100 ppm Repeatability error, including ripple: <100 ppm Resolution between adjacent steps of current set point: = 10 ppm
The homogeneity of the fields in the general purpose magnets is 0.02 % to 0.05 % over a 10 mm diameter sample volume. A specially designed 24.5 T magnet and specially compensated sample holders have been installed for magnetic resonance measurements at high fields.
Each magnet is surrounded by a platform at a height that allows the user to reach the sample holder in the top of the cryostat in the magnet without excessive reaching or bending. The platform is wide and strong enough to support equipment as well as users walking on it. Most access is from the top, but access from below is possible.
General Purpose DC Magnets Available
FIELD (T), FIRST USE POWER (MW) NO. IN USE CELL NOS.
BORE (mm)
SUPERCONDUCTING
20, 52 5/93 1 4
20, 52 7/93 1 6
19.5, 52 8/93 1 LANL
RESISTIVE
20, 50 3/94 8 2 3,5
27, 32 7/94 13.5 1 12
30, 32 3/95 15 2 8,9
34, 32 10/95 20
24.5, 32(1) 7/95 15 1 7
25, 50(2,3) '97 or 15 2
'98
20, 200 '97 20 1
30, 32(3) '99 15 1
HYBRID
40 or 50, 32 12/96 20 or 36 1 15
(1)
Higher homogeneity magnet (10 ppm/cm unshimmed)(2) Replacement for 20 T, 50mm magnets
(3) Magnet with larger bore to allow shim, modulation, and gradient coils to be wound on the bore tube.
Elevation drawings of installed magnets can be viewed by clicking on the following:
Cell 3, Cell 4, Cell 5, Cell 6, Cell 7, Cell 8, Cell 9, Cell 12, Cell 15
Return to NHMFL Home Page
Return to NHMFL Operations Home Page
 |
 |
 |
 |