| Paper | Title | Page |
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| THPMA013 | Effect of Eddy Current in Magnetic Lamination on Pulsed Septum Magnet Response | 643 |
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Indus-2 Pulsed septum magnets have been developed using 0.1 mm thick Ni-Fe laminations, which were electrically insulated from each other. These laminations were annealed in Hydrogen furnace & then oxidized in a Air controlled furnace. A process has been optimized to get 10-micron oxidization thickness on both sides of lamination. A pulse test set up has been built to characterize the laminations at high magnetization rates (‘~ 1 T/us). Electromagnetic simulation of the main field in the gap & field free region ' leakage/stray field for Septum magnets were performed using Flux 2D. A stray field (~1G-m) was stringent so as not to distort circulating beam. Magnetic screen has been optimized to minimize the stray fields. A pulsed thin & thick septum magnets were excited using 50 ms half sine wave, the field homogeneity in the order of 100 PPM & Integrated stray field 0.7 G-m has been obtained. This paper focus on Eddy current effect in lamination on pulse magnetic response, attenuation, phase shift & resonance in lamination due to pulse frequency. Modeling of magnetic circuit, shielding of septum & pulse response of NiFe lamination at high magnetic amplitudes(1.2T ) is also presented.
R. K. Mishra, P. Pareek, M. M.Pandey, V. Gaud, S. Senthil kumar |