Method for fringe field compensation of an actively shielded superconducting NMR magnet
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 17, 2006
Grant Date -
Mar 31, 2005
app pub date -
Aug 27, 2004
filing date -
Sep 27, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention concerns a method for charging an actively shielded magnet coil arrangement (20) comprising a first partial region (21) which can be superconductingly short-circuited using an additional switch (23), and a second partial region (22), wherein the two partial regions (21, 22) generate dipole moments of different signs. The magnetic fringe field B* is measured close to the desired operating state of the arrangement (20) and operating currents are determined for each of the two partial regions (21, 22) at which the overall magnetic field B is free from an additional dipole moment caused by production tolerances to permit setting of the theoretically optimum fringe field, irrespective of production tolerances. These operating currents are adjusted taking into consideration the inductive coupling between the partial regions (21, 22) through initially charging the entire magnet coil arrangement (20) and, after closing the additional switch (23), through continuation of the charging process in the second partial region (22) only. This eliminates deviations, which are caused by production tolerances, from the optimum theoretical fringe field of the arrangement (20) in a simple and inexpensive manner.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2004 Application Filing Year
- G01R Class
- 2930 Applications Filed
- 1542 Patents Issued To-Date
- 52.63 % Issued To-Date
