1. Developments of fast response kicker magnets for Rare-RI Ring
Akira Tokuchi
Pulsed Power Japan Laboratory Ltd.
Nagaoka University of Technology
Yoshitaka Yamaguchi
RIKEN Nishina Center
Akira Ozawa
Institute of Physics, University of tsukuba

2. President Akira Tokuchi
New Pulsed Power Company in Japan
Established in May, 2009
Our president has developed many pulsed power machines for more than 30 years
President Akira Tokuchi

3. Conceptual design for Rare-RI Ring

4. Requirements and Technical problems for Kicker Magnet PS
Requirement Achieved
Output Current 2kAp 2kAp
Pulse Width 200ns ← 1125ns
Delay from Trigger <290ns ← 2.67μs
Charging Time <200μs ← >10ms
Technical Problem 1: shortening of delay time from trigger
Technical Problem 2: shortening of charging time

5. Technical Problem 1: shortening of delay time from trigger
Conventional Block Diagram
<290ns required
550ns
2.67μs
Faster thyratron gate unit was required

6. Technical Problem 1: Shortening of delay time form trigger
New Thyratron gate board
1.Faster Optical Link (DC9351:hitachi)
2.Faster FET Drivers (DEIC420:IXYS)
3.Faster MOS-FETs (DE N21A:IXYS)
4.Faster Pulse Trans.s (Finemet:hitachi)

7. New Thyratron gate board
2.FET Driver 38ns
1.Opt. link 30ns
3.MOS-FET 19ns ①
4.Pulse Trans. 23ns ②
① Delay time from ext. trigger to optical link input 55ns
② Delay time from ext. trigger to grid pulse 165ns
②－① Delay time from optical link input to grid pulse 110ns 7

8. Results of Delay Time for Kicker P.S.
Target Line(<290ns)

9. Kicker Magnet Operation(20kV)
100ns/div
Ext. Trig.
+50ns
Integ. Of pick up coil
-15ns
Delay 385ns
THY.Current
-25ns
Delay 305ns
Pick up coil
-15ns 9

10. Technical Problem 1: Shortening of delay time form trigger
Further improving plan
Further shortening of delay time in FET-Drivers by replacement them. (38ns→25ns)
Further shortening of delay time in pulse trans- formers by reducing leakage inductance (23ns→16ns)
Deleting transition time of optical link to change a high voltage PFL circuit. (30ns→0ns)
Target of a total reduction delay time is 50ns.
Delay time target ns → 225ns 10

11. Plan of changing the PFL circuit

12. Technical Problem 2: shortening of charging time
Main Charge
Hybrid Charging System
Sub Charge

13. Technical Problem 2: shortening of charging time
Main Charge
Sub Charge
100%
90%
Voltage
Hybrid Charging System
4Ap
0.4Ap
500kHz
100μs
200μs
time

14. summary We developed the fast response kicker system.
Faster optical link, FET driver, MOS-FET and pulse transformer were adopted in the new thyratron gating board, and the obtained response time of the kicker power supply was 275ns. It was short for realization of the self-trigger individual injection method with an energy of 200 MeV/nucleon.
In order to get further margin of the response time, we will try to improve by (1)replacement of FET driver, (2)reduction of leakage inductance of pulse transformer and (3)changing the PFN circuit.
Our kicker system will be used not only for injection but also for extraction. So high-speed repetition charging system is necessary. We have begun to examine the feasibility of a hybrid charging system.

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