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Accelerator Design and Construction for FFAG-KUCA ADSR

Accelerator Design and Construction for FFAG-KUCA ADSR. Y.Ishi Mitsubishi Electric Corp. Oct. 15 2004. 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 and Construction for FFAG-KUCA ADSR

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  1. Accelerator Design andConstruction for FFAG-KUCAADSR Y.Ishi Mitsubishi Electric Corp. Oct. 15 2004

  2. 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 (B~rk) • 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 ( need ~10nA)

  5. basic experiments future upgrade Beam specifications H＋ 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 KUCA subcritical reactor booster 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 2.5 pole 2.84 1.27m 1.87m Main ring 20MeV 150MeV Radial DFD rf 12 7.5 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. Layout of the complex

  10. Specifications of the injector

  11. Image view of the injector

  12. Top view of the injector

  13. Top view of the injector

  14. Cross section of the magnet

  15. Tune of the Injector

  16. Model of injector magnet

  17. Injector main magnet

  18. Injector main magnet2

  19. Induction acceleration V=dF/dt Duty=(tb-ta)/ts =x（1-Vta/DBS) V=DBS/tb x=tb/ts High duty x large DB →large S →large

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

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

  22. Induction core

  23. Booster layout Rf cavity Extraction kicker magnet Injection bump magnet Injection bump magnet Injection bump magnet Injection septum electrode Injection septum magnet

  24. Specifications of the booster extraction 20 0.6496 1.736 1.865 5.294 1.376/0.462 injection 2.5 0.2286 1.270 1.364 2.595 0.637/0.204 T（MeV) Br（Tm) k Vrf(kV) Rmin(m) Rmax(m) frev(MHz) BF/FD(T) tune 2.5 1.6 – 3.0 (2.15,1.38)

  25. Lattice structure of the booster

  26. Lattice functions of the booster

  27. K value optimization

  28. K value optimization

  29. Booster main magnet

  30. Cross section of the booster main magnet

  31. Booster tune variation

  32. 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)

  33. TOSCA calculation

  34. Main ring main magnet

  35. Main magnet F coil

  36. Main magnet D coil

  37. Main ring vacuum chamber1

  38. Main ring vacuum chamber2

  39. Summary • Accelerator complex is now under construction • First beam from FFAG will be injected to subcritical reactor in 2005.

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