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Accelerator Design for FFAG-KUCA ADSR

Accelerator Design for FFAG-KUCA ADSR. Y.Ishi Mitsubishi Electric Corp. July 7 2003. What is ADSR?. Accelerator Driven Subcritical Reactor. charged particle. target for generating neutron. accelerator. subcritical reactor. Beam off  chain reaction stops Safer system !.

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Accelerator Design for FFAG-KUCA ADSR

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  1. Accelerator Design for FFAG-KUCAADSR Y.Ishi Mitsubishi Electric Corp. July 7 2003

  2. What is ADSR? Accelerator Driven Subcritical Reactor charged particle target for generating neutron accelerator subcritical reactor Beam off  chain reaction stops Safer system !

  3. FFAG for ADSR Accelerators should have high power efficiency Pbeam / Ploss > 30% FFAG • Fixed field -extremely high rep. rate(1kHz)  high intensity -superconducting magnet  small Ploss • Alternating gradient -compact size

  4. ADSR in Kyoto University Research Reactor Institute(KURRI) Feasibility study of ADSR Five-year program 2002 – 2006 Subject • Accelerator technology -variable energy FFAG • Reactor technology -basic experiments for energy dependence of the reactor physics

  5. basic experiments future upgrade Beam specifications H＋ 20-150MeV 1mA 120Hz H＋ 200MeV 100mA １kHz Beam species Energy Average beam current Rep. rate

  6. FFAG – KUCA ADSR system schematic diagram 100keV 2.5MeV 20MeV 150MeV ion source injector booster KUCA subcritical reactor main ring

  7. Parameters of the Accelerator Complex Einj Eext Lattice type Acc. scheme # of cells k value coil/pole Pext/Pinj Rinj Rext Injector 100keV 2.5MeV Spiral Induction 8 2.5 coil 5.00 0.60m 0.99m Booster 2.5MeV 20MeV Radial DFD rf 8 4.5 coil 2.84 1.42m 1.71m Main ring 20MeV 150MeV Radial DFD rf 12 7.6 pole 2.83 4.54m 5.12m

  8. Beam intensity schedule Scheme continuous continuous 12-turn 1-turn 1-turn 1-turn Efficiency 90% 70% 80% 95% 95% 95% pulse length 50ms 5ms 5ms 50ns 50ns 65ns peak current 5mA - 32mA - 2.4A - 1.6A Ion source Injector inj. Injector ext. Booster inj. Booster ext. Main ring inj. Main ring ext. <I>=1.6A ×65ns ×1kHz = 108mA

  9. Injector

  10. Space charge effects in the injector Dnx=0.05, Dny=0.16 when ex=50pmm-mrad ey=100pmm-mrad

  11. Pulse structure of the beam Vgap=2kV continuous injection to the injector Vgap=30kV compressed pulse from the injector

  12. Acceleration voltage pattern spill acc. period 5ms injection 50ms acc. Voltage

  13. Injection efficiency of the injector

  14. Specifications of the injector

  15. Lattice structure of the booster

  16. Lattice functions of the booster

  17. Specifications of the booster extraction 20 0.6496 1.650 1.774 5.564 1.487/1.487 injection 2.5 0.2286 1.346 1.467 2.412 0.633/0.633 T（MeV) Br（Tm) k Vrf(kV) Rmin(m) Rmax(m) frev(MHz) BF/FD tune 4.5 3(10) (3.24,1.56)

  18. Variable energy • Extraction energy of the injector is fixed at 2.5MeV • Momentum ratio in the main ring is fixed at 2.81 • Need to vary k value in the booster k T(MeV) T(MeV) booster main ring 0.5 3.0 23 4.5 20 150

  19. Tune vs k ｋ

  20. Flat-pole multi-coil B=B0(r/r0)k

  21. Current distribution of the booster coil

  22. 2d calculation of magnetic field

  23. k value vs r

  24. Specifications of the main ring (the same design as KEK 150MeV) extraction 150 1.8390 5.023 5.229 4.651 1.699/0.998 injection 20 0.6496 4.451 4.633 2.106 0.678/0.398 T（MeV) Br（Tm) k Rmin(m) Rmax(m) frev(MHz) BF/FD tune 7.6 (3.73,1.55)

  25. Injector Layout Booster Main ring

  26. Construction Schedule

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