Author: Makino, K.
Paper Title Page
WEPAB026 BRho-Dependent Taylor Transfer Maps for Super-FRS Dipole Magnets 2631
SUSPSIK049   use link to see paper's listing under its alternate paper code  
 
  • E.S. Kazantseva, O. Boine-Frankenheim
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Berz, R. Jagasia, K. Makino
    MSU, East Lansing, Michigan, USA
  • H. Weick, J.S. Winfield
    GSI, Darmstadt, Germany
 
  The Super-FRS is an in-flight projectile fragment separator being built at GSI for FAIR. Due to the required high design momentum resolution and large acceptance (Ah= ±40mrad, Av= ±20mrad) the dipole magnets of the Super-FRS have large apertures (38×14cm²). The wide design magnetic rigidity (BRho) range 2-20 Tm requires the variation of the main dipole magnetic field B0 in the range 0.16-1.6 T. Since the upper third of the B0 range is situated in a non-linear saturation region of the magnetization curve B(H) and the spatial distribution of magnetic permeability in the steel yoke is non-uniform, the field distribution in the useful aperture of the magnet is a non-linear and non-uniform function of the excitation current I. One consequence is the shortening of the effective length and the change of the field distribution with increasing I. In this study we analyze these effects for the Super-FRS dipole magnets. We use 3D field distribution from FEM simulations for different I values and a resulting BRho(I). From the fields the Taylor transfer maps for the particles are obtained using DA techniques (COSY-infinity) and the convergence of the resulting transfer maps is discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB026  
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