| Paper | Title | Page |
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| WEPMA051 | Development of Wide Band FCT System for Booster Synchrotron of Indus-1 & 2 | 396 |
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| A high precision & non-destructive type of wide band FCT for the measurements of electron current has been developed. This monitoring system is composed of slow & fast FCTs, NiZnCo ferrite toroidal cores, pick up coils, electromagnetic shields & pulse amplifiers. A wide band FCT (rise time 60 ns & decay 1 ms) required for measurement of Electron beam intensity & turn-to-turn observation & stored current accumulation during 1 us pulse injection into Booster Synchrotron. Single FCT can't measure e beam current & turn-by-turn observation from 60 ns to 1 ms. Therefore, we designed & developed two FCTs housed in a single box. The spacing between them is optimized so that coupling between them will not affect pulse shape. The FCT consists of two NiZn ferrite ring cores separable into two pieces for easy setting around ceramic beam duct. A beam intensity of pulse (100 ns ~1 us) beam is monitored by fast rise Current monitor (~ 60 ns)& turn/stored currents monitored by slow FCT (~ 1 us to 1 ms). A wide band FCT showed fast rise & slow decay, high sensitivity (0.050V/mA), linearity within 1 % & good S/N ratio. This paper focuses on FCT designs, construction & their pulse response | ||
| 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 |