Method for homogenizing the field of a magnetic coil and apparatus therefor
US4683434A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1986 |
| Grant date | Jul 28, 1987 |
| Priority date | — |
| Expiry date | Mar 24, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F7/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus are proposed for homogenizing the field of a primary magnetic coil which can be energized from a primary current source and operated in a superconductive manner and short-circuited by means of superconducting switches. A profile of the uncorrected field of the primary coil is measured along an axis of the coil, and parameters for compensating fields are determined from the profile, with the compensating fields then being superimposed on the uncorrected field. In order to avoid the necessity of having to re-heat and then cool the primary coil for attachment of correcting windings for the compensating fields, the invention calls for separately energizable supplementary coils to be brought to a low temperature together with the primary coil, the field profile of the primary coil to be measured, the corresponding field gradients to be determined therefrom, and correcting currents for each individual supplementary coil to be determined therefrom and set, with the superconducting switches of the supplementary coils then being made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.