Eddy Current Reduction in Fast Ramped Bending Magnets

Author

Negrazus, M. ; George, D. ; Vrankovic, V. ; Werner, M.

Author_Institution

Paul Scherrer Inst., Villigen

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

228

Lastpage

230

Abstract

At the Paul Scherrer Institute (PSI/Switzerland) a new proton gantry for cancer treatment is planned. A fast 3 dimensional scanning technique of the tumor volume is one of the medical highlights of this new gantry. The gantry will be driven by the new COMET proton cyclotron, which will deliver a cw proton beam. The energy of this beam will be adjusted by a fast degrader device. All beam line magnets should follow the energy changes of the degrader as fast as possible. Therefore the eddy current effects in the laminated bending magnets of the beam line and the gantry must be reduced by an appropriate magnet design. The paper shows measurements and numerical simulation of the dynamic behavior of the fast switched bending magnets and design schemes for eddy current reduction in the bending magnets

Keywords

accelerator magnets; cancer; cyclotrons; eddy currents; patient treatment; proton beams; tumours; 3D scanning technique; COMET proton cyclotron; CW proton beam; Paul Scherrer Institute; beam line magnets; cancer treatment; eddy current reduction; fast degrader device; fast ramped bending magnets; fast switched bending magnets; laminated bending magnets; magnetic variables measurement; proton gantry; tumor volume; Cancer; Current measurement; Cyclotrons; Degradation; Eddy currents; Magnets; Neoplasms; Numerical simulation; Particle beams; Protons; Eddy currents; magnetic variables measurement; magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.870512

Filename

1642832