Solid State Modulators for FERMI

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Solid State Modulators for FERMI

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1. Solid State Modulators for FERMI Chris Pappas 2-27-07

2. FERMI Overview

3. Modulator Options Upgrade existing ELETTRA linac PFN/thyratron modulators to run at 50 Hz. Build new S.S. induction modulators. Build new “hybrid” S.S. induction modulators. Will build one new conventional modulator and one hybrid S.S. modulator this year. Deliver 5 modulators by end ’08. Deliver 10 modulators by end ’09.

4. Requirements Klystron Thales TH2132 Perviance 1.9-2.1 µA/V3/2 Voltage 320 kV Current 350 A Pulse Width 4.5 µs PRF 50 Hz Flat Top Deviation <±1% Pulse-Pulse Ripple <±0.1%

5. Schematic of Hybrid Modulator

6. Modulator Specifications Transformer Turns Ratio 11:1 Number of Cells 8 Number IGBTs per Cell 2 Nominal IGBT Voltage 3820 V IGBT Voltage w/Fault 4365 V IGBT Current 1925 A Core Material 2605CO Core ID 135 mm Core OD 430 mm Core Height 25.4 mm Number Cores/Cell 3

7. Mechanical Design Looks very similar to the 2-pack modulator. Will use existing ELETTRA linac racks, transformer and HV tank.

9. Modulator Stack

10. Assembled Stack

11. Electronics Design Use 6.5 kV, 600 A IGBTs Driver is similar to the 8-pack/SPEAR kicker drivers. Each cell can have independently programmed delays. Delays and faults are communicated over a serial bus to a PLC. Use both di/dt and I*V IGBT fault detection.

12. System Block Diagram

13. Detail of BD

14. Core Drive Board

15. Buffer/Fault Board

16. Gate Drive Board

17. Discriminator Board

18. Trigger Board

19. SPICE Model of Droop

20. R-L Droop Compensation

21. Schedule

22. Conclusions Very similar design to the 2-pack and ORION modulators. Conceptual design is completed. Now we are detailing mechanical parts, and making PCBs. Large orders are being places for cores, IGBTs etc. We have a very aggressive schedule.

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