accelerator design and construction for ffag-kuca adsr
DESCRIPTION
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 !. - PowerPoint PPT PresentationTRANSCRIPT
Accelerator Design andConstruction for
FFAG-KUCA ADSR
Y.Ishi Mitsubishi Electric Corp.Oct. 15 2004
ADSRAccelerator 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 (B~rk)
• 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 ( need ~10nA)
Beam specifications
Beam species
Energy
Average beam current
Rep. rate
H +
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
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
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
Layout of the complex
Specifications of the injectoritem
Energy<I>
Rep. ratePulse length
kspiral angle
tuneSize
Weight
(1.85,0.80)
specs
42 degree2.5
MeV2.5μ A0-2
Hz- 1kHz120μ s1-5
3500Wx6000Dx2500H30t
Image view of the injector
Top view of the injector
Top view of the injector
Cross section of the magnet
Tune of the Injector
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5
ν x
ν y
model27d
model28
model30
Model of injector magnet
Injector main magnet
Injector main magnet2
Induction accelerationV=d/dt
Duty=(b-a)/s
= ( 1-Va/BS)
V=BS/b
=b/s
High duty
large
B → large
S → large
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
Induction core
Booster layout
Injection septum magnet
Injection septum
electrode
Injection bump magnet
Injection bump magnet
Injection bump magnet
Extraction kicker magnet
Rf cavity
T ( MeV)
B ( Tm)
k
Vrf(kV)
Rmin(m)
Rmax(m)
frev(MHz)
BF/FD(T)
tune
injection
2.5
0.2286
1.270
1.364
2.595
0.637/0.204
extraction
20
0.6496
1.736
1.865
5.294
1.376/0.462
2.5
1.6 – 3.0
(2.15,1.38)
Specifications of the booster
Lattice structure of the booster
Lattice functions of the booster
K value optimization
K value optimization
Booster main magnet
Cross section of the booster main magnet
Booster tune variation
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)
TOSCA calculation
Main ring main magnet
Main magnet F coil
Main magnet D coil
Main ring vacuum chamber1
Main ring vacuum chamber2
Summary
• Accelerator complex is now under construction
• First beam from FFAG will be injected to subcritical reactor in 2005.