Cyclotron with yokeless superconducting magnet
US4943781A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 18, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Jul 18, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H13/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A cyclotron having a cylindrical superconducting magnet which generates an axial magnetic field and has a central opening or chamber of substantially circular cross-section. The accelerating beam space is located in this chamber lying normal to the axis of the magnetic field. The azimuth variation of magnetic field as well as the isochronous radial variation of magnetic field required to control the orbiting of the ion beam in the beam space, are provided by ferro-magnetic pole pieces located in the axial chamber, which interact with the magnetic field to cause the required field variations. Interposed between the pole pieces are resonant frequency members which provide the radio frequency energization to accelerate the ion beam around the beam space. Having the whole of the central chamber free for top and bottom access enables the pole pieces to be given an efficient design shape. Also, the radio frequency members are able to be interposed between the pole pieces and are not restricted as to axial length and so can be made a very efficient length, such as quarter wave length resonators. The radio frequency members have axially extending hollow interiors which open into the beam s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.