Accelerator Design and Construction for FFAG-KUCA ADSR

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

• Accelerators should have high power efficiency
• Pbeam / Ploss gt 30
• FFAG (Brk)
• Fixed field
• -extremely high rep. rate(1kHz) ? high
  intensity
• -superconducting magnet ? small Ploss
• Alternating gradient
• -compact size

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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)

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• Beam specifications

future upgrade
basic experiments
H 150MeV 1mA 120Hz
H 200MeV 100mA 1kHz
Beam species Energy Average beam current Rep. rate
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FFAG KUCA ADSR system schematic diagram
100keV
2.5MeV
20MeV
150MeV
ion source
injector
KUCA subcritical reactor
booster
main ring
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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
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Beam intensity schedule
Scheme continuous continuous 12-turn 1-turn 1-tur
n 1-turn
pulse length 50ms 5ms 5ms 50ns 50ns 65ns
peak current 5mA - 32mA - 2.4A - 1.6A
Efficiency 90 70 80 95 95 95

• Ion source
• Injector inj.
• Injector ext.
• Booster inj.
• Booster ext.
• Main ring inj.
• Main ring ext.

ltIgt1.6A 65ns 1kHz 108mA
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Layout of the complex
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Specifications of the injector
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Image view of the injector
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Top view of the injector
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Top view of the injector
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Cross section of the magnet
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Tune of the Injector
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Model of injector magnet
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Injector main magnet
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Injector main magnet2
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Induction acceleration
VdF/dt Duty(tb-ta)/ts
x(1-Vta/DBS) VDBS/tb xtb/ts
High duty x ?large DB ? large S ? large
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Pulse structure of the beam
Vgap2kV
continuous injection to the injector
Vgap30kV
compressed pulse from the injector
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Acceleration voltage pattern
spill
acc. period
5ms
injection 50ms
acc. Voltage
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Induction core
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Booster layout
Rf cavity
Extraction kicker magnet
Injection bump magnet
Injection bump magnet
Injection bump magnet
Injection septum electrode
Injection septum magnet
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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)
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Lattice structure of the booster
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Lattice functions of the booster
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K value optimization
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K value optimization
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Booster main magnet
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Cross section of the booster main magnet
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Booster tune variation
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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 tu
ne
7.6 (3.73,1.55)
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TOSCA calculation
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Main ring main magnet
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Main magnet F coil
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Main magnet D coil
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Main ring vacuum chamber1
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Main ring vacuum chamber2
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Summary

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