3-D magnetic calculation methods for spiral scaling FFAG magnet design Planche, T. ; Neuveglise, D. ; Lancelot, J. L. ; Sigmaphi, Vannes ; Fourrier, J. ; Pasternak, J. ; Froidefond, E. ; Autin, B. ; Meot, F. Abstract Publication: 22nd Particle Accelerator Conference (PAC 07) Pub Date: 2007 Bibcode: 2007pac..conf.1401P