| Paper |
Title |
Page |
| TUPD010 |
High-power Switch with SI-thyristor for the Power Supply of Very High Repletion Rate Pulsed Quadrupole Magnet
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1452 |
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- T. Mimashi, M. Kikuchi
KEK, Ibaraki
- A. Tokuchi, K. Tsuchida
Nichicon (Kusatsu) Corporation, Shiga
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A solid-state switch with SI-thyristors is implemented as the high power switch for the pulsed quadrupole magnet power supply. Its repletion rate is 100 kHz with the half sign 1 microsecond pulse. The switch has been successfully operated.
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| TUPD011 |
The Pulsed Quadrupole Magnet for KEKB Low Energy Ring
|
1455 |
| |
- T. Mimashi, T. Ieiri, M. Kikuchi
KEK, Ibaraki
- A. Tokuchi, K. Tsuchida
Nichicon (Kusatsu) Corporation, Shiga
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In the KEKB low energy ring, because of photoelectron clouds, the betatron tune changes along the position in the train. The produced photoelectron gives focusing force to the beam. It is remarkable especially in the vertical tune. Since we have a 500 nanoseconds beam abort gap, the photoelectron focusing force is weaker at the head of train. It means the vertical tune is lower at the head of the train. In order to cancel this tune shift, the pulsed quadrupole magnet was installed. The pulsed quadrupole magnet system and its performance are described.
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