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Beam Chopper R & D for Next Generation High Power Proton Drivers

Beam Chopper R & D for Next Generation High Power Proton Drivers. Michael. A. Clarke-Gayther. RAL / ASTeC / HIPPI. HIPPI WP4: The RAL† Fast Beam Chopper Development Programme Progress Report for the period: January 2004 – June 2005 M. A. Clarke-Gayther †

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Beam Chopper R & D for Next Generation High Power Proton Drivers

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  1. Beam Chopper R & D forNext GenerationHigh Power Proton Drivers Michael. A. Clarke-Gayther RAL / ASTeC / HIPPI

  2. HIPPI WP4: The RAL† Fast Beam Chopper Development Programme Progress Report for the period: January 2004 – June 2005 M. A. Clarke-Gayther † † CCLRC Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK

  3. Fast and slowchoppermodules Chopper 1 (fast transition) BEAM Chopper 2 / Beam dump(slower transition)

  4. Phase 2 FPG system Dual polarity @ 1.4 kV max. High peak power loads Control and interface Power supply 9 x Pulse generator cards 9 x Pulse generator cards Combiner 9 x Pulse generator cards 9 x Pulse generator cards 4 M. A. Clarke-Gayther RAL/ASTeC/HIPPI

  5. Measured performance parameters for the Phase 2 FPG system

  6. Time & amplitude dependent FPG waveform analysis / 324 MHz FETS scheme

  7. FPG duty cycle and LF droop for the ESS and FETS schemes † Assumes 4 kV SPG with ~ 9 ns transition time (10 – 90 %) †† Assumes 8 kV SPG with ~ 12 ns transition time (10 – 90%)

  8. FPG duty cycle droop compensation

  9. FPG duty cycle droop compensation OFF I.S. RAMPING (100 % CHOPPING) 30 % CHOPPING

  10. FPG duty cycle droop compensation OFF I.S. RAMPING (100 % CHOPPING) 30 % CHOPPING

  11. FPG duty cycle droop compensation OFF I.S. RAMPING (100 % CHOPPING) 30 % CHOPPING

  12. FPG duty cycle droop compensation I.S. RAMPING CH BEAM CH BEAM CH BEAM CH BEAM CH 805 ns

  13. FPG duty cycle droop compensation I.S. RAMPING CH BEAM CH BEAM CH BEAM CH BEAM CH 805 ns

  14. SPG prototype system / Modular construction SPG Module 0.8 m 0.28 m

  15. Measured performance parameters for the ‘Breadboard’ SPG system

  16. Status • SPG prototype system designed and part constructed • Pre - prototype measurements show PRF limitation • Prototype tests will explore switch limitations • Preparation of detailed specification for new HV switch • FETS schemes A & B reduce voltage requirement • Identification of candidate HV switch manufacturers • Behlke (Germany), DEI (USA), Kentech (UK) • Distribute SPG specification to manufacturers • Prepare to modify existing SPG module design

  17. Helical structure B with L - C trimmers and adjustable delay Adjustable L-C trimmer Adjust cable lengths to change delay

  18. Helical structure C with L - C trimmers Quadrupole bore diameter

  19. Planned activity • Re-design for 3 MeV operation • Simulation using CST Microwave Studio code • Implications of reduced delay to be explored • Integrate adjustable L-C trimmers into new design • Manufacture pre-prototype modules • Bench test using TDR & TDT techniques

  20. Summary • Three candidate chopping schemes for RAL FETS • Schemes A & B ready for first engineering analysis • FPG can meet ESS and RAL FETS requirements • Duty cycle droop compensation scheme to be tested • SPG prototype system designed and part constructed • Pre - prototype measurements show PRF limitation • Slow – wave structure engineering concepts refined • L – C impedance trimming and adjustable delay

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