Alexander Kalimov, State Polytechnic University, St.-Petersburg 3D Properties of cos-theta Quadrupole in Comparison to Superferric Quadrupole Alexander Kalimov, State Polytechnic University, St.-Petersburg January 2009
Main requirements A.Kalimov, GSI, 22 January 2009
2D design of the cos-theta magnet A.Kalimov, GSI, 22 January 2009
Field characteristics (2D) Magnetic field along the line r=375 mm, dB/dr = 5 T/m Field harmonics in the aperture (r=200 mm) A.Kalimov, GSI, 22 January 2009
3D model of the cos-theta magnet A.Kalimov, GSI, 22 January 2009
Integral field quality Field harmonics 2D 3D Corrected 3D Integral field quality A.Kalimov, GSI, 22 January 2009
Field characteristics Field integrals along r = 190 mm Field along z-axis A.Kalimov, GSI, 22 January 2009
Cross section of the superferric magnet A.Kalimov, GSI, 22 January 2009
Field quality (2D) A.Kalimov, GSI, 22 January 2009
Field harmonics A.Kalimov, GSI, 22 January 2009
Quadrupole magnet with 12-pole corrector 12-pole corrector improves the field quality at high gradients A.Kalimov, GSI, 22 January 2009
3D model of the superferric magnet A.Kalimov, GSI, 22 January 2009
Integral field quality (1.2 m) Integral field quality satisfy requirements only For dB/dr < 8 T/m A.Kalimov, GSI, 22 January 2009
Required accuracy of the coil positioning Tolerances Required accuracy of the coil positioning is about ± 1mm A.Kalimov, GSI, 22 January 2009
Mutual influence of the magnets Distance between yokes > 250 mm A.Kalimov, GSI, 22 January 2009
Summary 1. Both concepts of the SuperFRS quadrupoles – cos-theta and superferric are in principle acceptable. 2. Advantages of the cos-theta magnet: High field quality, week saturation effects; Correction 12-pole coils are not necessary; Possibility to combine several magnets inside the same yoke; Smaller outer diameter and total weight. 3. Advantages of the superferric magnet Simple coils; Requirements to tolerances are not so strong (~±1mm for coils); Quickly decreasing fringing fields, the magnet is shorter. A.Kalimov, GSI, 22 January 2009