Accelerator Design for FFAG-KUCA ADSR
Y.Ishi Mitsubishi Electric Corp.July 7 2003
What is ADSR?Accelerator Driven Subcritical Reactor
charged particle
accelerator
subcritical reactor
target for generating neutron
Beam off chain reaction stopsSafer system !
FFAG for ADSRAccelerators 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
ADSR in Kyoto University Research Reactor Institute(KURRI)
Feasibility study of ADSR
Five-year program 2002 – 2006
Subject1. Accelerator technology -variable energy FFAG 2. Reactor technology -basic experiments for energy dependence
of the reactor physics
Beam specifications
Beam species
Energy
Average beam current
Rep. rate
H +
20-150MeV
1A
120Hz
H +
200MeV
100A
1 kHz
future upgradebasic experiments
FFAG – KUCA ADSR system schematic diagram
ion source
injector
main ring KUCA
subcritical reactor
booster
100keV 2.5MeV 20MeV 150MeV
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
Beam intensity schedule
Ion source
Injector inj.
Injector ext.
Booster inj.
Booster ext.
Main ring inj.
Main ring ext.
Scheme
continuous
continuous
12-turn
1-turn
1-turn
1-turn
pulse length
50s
5s
5s
50ns
50ns
65ns
peak current
5mA
-
32mA
-
2.4A
-
1.6A
Efficiency
90%
70%
80%
95%
95%
95%
<I>=1.6A ×65ns ×1kHz = 108A
Injector
Space charge effects in the injector
x=0.05,
y=0.16
when
x=50mm-mrad
y=100mm-mrad
Pulse structure of the beam
continuous injection to the injector
compressed pulse from the injector
Vgap=2kV
Vgap=30kV
acc. period spill
5s
acc. Voltageinjection
50s
Acceleration voltage pattern
Injection efficiency of the injector
0
20
40
60
80
100
120
0 1 2 3 4 5EnergyGain(keV/ turn)
Inje
ctio
n E
ffici
ency
(%)
K=4.5K=3.0
Specifications of the injectoritem
Energy<I>
Rep. ratePulse length
kspiral angle
tuneSize
Weight
MeV2.5μ A0-2
Hz- 1kHz120μ s1-5
3500Wx6000Dx2500H30t
(2.2,1.3)
specs
40 degree2.5
Lattice structure of the booster
Lattice functions of the booster
T ( MeV)
B ( Tm)
k
Vrf(kV)
Rmin(m)
Rmax(m)
frev(MHz)
BF/FD
tune
injection
2.5
0.2286
1.346
1.467
2.412
0.633/0.633
extraction
20
0.6496
1.650
1.774
5.564
1.487/1.487
4.5
3(10)
(3.24,1.56)
Specifications of the booster
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
Tune vs k
0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3 4 5
nxny
k
Flat-pole multi-coil
B=B0(r/r0)k
Current distribution of the booster coil
0
500
1000
1500
2000
2500
1 2 3 4 5 6 7 8 9 10111213 141516 17181920 2122
Coil No.
[A]
電流
2d calculation of magnetic field
k value vs r
0
1
2
3
4
5
6
7
160 170 180 190 200 210
r [cm]半径
k v
alue
Specifications of the main ring(the same design as KEK 150MeV)
T ( MeV)
B ( Tm)
k
Rmin(m)
Rmax(m)
frev(MHz)
BF/FD
tune
injection
20
0.6496
4.451
4.633
2.106
0.678/0.398
extraction
150
1.8390
5.023
5.229
4.651
1.699/0.998
7.6
(3.73,1.55)
Layout
Main ring
Booster
Injector
4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3
Ion source and injector(competitive bid) Design and engineering
construction
assembly and testing
installation and alignment
on site testingBooster
Design and engineering
constructioncomponent testing
installation and alignment
on site testingMain ring
Engineering
constructioncomponent testing
installation and alignment
on site testingSystem
commissioning
2003 2004 2005
Construction Schedule
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