hiat 2009, 9 th june, venice 1 design study of medical cyclotron scent300 mario maggiore on behalf...
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HIAT 2009, 9th June , Venice 1
DESIGN STUDY OF MEDICAL CYCLOTRON SCENT300
Mario Maggiore
on behalf of R&D Accelerator team
Laboratori Nazionali del SudCatania, Italy
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SYNCHROTRONS are today used everywhere (japan, GSI, CNAO) for carbon beam therapy
CYCLOTRONSIBA C235 RESISTIVE COILS
ACCEL\VARIAN K250 SCPROTONS
SC CYCLOTRONIBA C400
INFN SCENT300
PROTONS
CARBON IONS
CYCLOTRONS PROVIDING LIGHT IONS
compactness and simplicity lower size and cost superconducting tech. high beam modulation control fixed energy (ESS needed)
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HIAT 2009, 9th June , Venice 3
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MAIN PARAMETERS
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INJECTION LAYOUT
Einj=25 AKeV
Vinflect= 14 KV
gapinflect= 6 mm
Einflect= 23KV/cm
Vdee inj=70 kVBo=3,15 tesla
ECR sources
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0 0.5 1 1.5 2 2.5 3 3.5 4-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
n turns
z [c
m]
CENTRAL REGION DESIGN
Beam centering
Vertical focusing during first turnsEnergy gain
250 AKeV/turn
YC
XC
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MAGNETIC FIELD PROPERTIES
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10 16 22 28 34 40 46 52 58 64 70 76 82 88 94 100 106 112 118 124 1303 10
4
2 104
1 104
0
1 104
2 104
3 104
ISOCHRONIZATION w/wo -1
R (cm)
0 10 20 30 40 50 60 70 80 90 100 110 120 13010
0
10
20
30
40
70 kV120 kV
PHASE DIAGRAM
R (cm)
DE
G
129.5
UNTIL THE PHASE VARIES WITHIN 20 DEG,
THE MAGNETIC FIELD HAS TO MATCH THE ISOCHRONOUS
ONEWITH A PRECISION OF ±5GAUSS (|ΔB/B|<10-4)
ISOCHRONIZATION LEVEL
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RF CAVITY DESIGN
50 kW power losses estimated
fRF = 98 MHz, 4 th harmonic
Emax= 15 MV/m
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BEAM DYNAMIC STUDY
structural resonance
coupling resonance
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WHAT APPENDS AT RESONANCE ZONE?
Solution?
Jump these radii…
but energy gain
cannot increase
too much
Minimal transverse stability plot
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qr 0. 0.1 1.5
1 1.1 1.2 1.3 1.4
0.2
0.4
0.6
0.8
0.5
0.3333
1 1.33333
0 30 60 90 120 150 180 210 240 270 3000.4
0.2
0
0.2
0.4260 292
0 30 60 90 120 150 180 210 240 270 3000.4
0.2
0
0.2
0.4260 292
Radial beam envelop in two cases
old magnetic design
energy energy
cm cm
QrQr
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AUTOELLIPSE TRANSPORT
900
1040
910
920
930
940
950
960
970
980
990
1000
1010
1020
1030
PR
R
Number ofturns
24.1 24.2 24.3 24.4 24.5 24.6 24.70.5
0.6
0.7
0.8
0.9
EO3
EO23
EO2
EO22
Ar=0.2
Ar=0.1
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60 80 100 1200.3
0.2
0.1
0
0.1
0.2
0.3
radius (cm)
Az
(cm
)
0.3 0.2 0.1 0 0.1 0.2 0.30.3
0.2
0.1
0
0.1
0.2
0.3
Z (cm)
Pz
(cm
)
VERTICAL BEAM DYNAMIC
Vertical beam envelop
Axial space phase
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Trimming C12 to H2+: RF and MF change
0 50 100400
200
0
200
dB r( )
r
Bo=cost.
Best solution: coils split into two parts (C400)
RF Frequency scales0,7 %
Two beams mean two differentoperating RF frequencies
small variation of the MFgauss
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2nd way: change only the magnetic field
0 50 100 1505 10
3
0
5 103
0.01
0.015
DEISOCHR. C12 vs H2+
RADIUS
fRF = cost
Magnetic field differencebetween C12 and H2+ is larger,but RF freq. is kept constant (it needs only the fine tuning)
0 50 100220
240
260
280
dB r( )
r
gauss
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Trimming by two correction coils
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0 10 20 30 40 50 60 70 80 90 100 110 120
4
2
0
2
4
FDB i r1 r2 r3( ) DBi
i
GOOD M. FIELD MATCHINGMINIMIZING POWER LOSSES
Less than
4 KW/COIL
MAIN COIL
CC 1CC VALLEY
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PHASE SLIP CALCULATED BY EO
0 13 26 39 52 65 78 91 104 117 130200
220
240
260
280
300
dB r( )
Baveh2 r( ) Bave r( )
124
r0 61 122 183 244 305
40
20
0
20
40
EOc1210
EOh210
260
EOc120
EOh20
gamma r( ) interp cspline raggio 1energia
931.494
raggio 1energia
931.494 r
0 13 26 39 52 65 78 91 104 117 1306.8 10
3
6.92 103
7.04 103
7.16 103
7.28 103
7.4 103
7.52 103
7.64 103
7.76 103
7.88 103
8 103
dB R( )
Bave R( )
124
R
MAGNETIC FIELD MATCHING
MAIN COIL : 4586 A/cm2 4586+53.7 A/cm2
CC 1: 104.47 A/cm2 8X8 cm2 , Rint=171 cm, Hmin=81 cm >> 1.32 kW/coil
CC VAL: 395.1 A/cm2 5X4 cm2 , Rint=106 cm, Hmin=69 cm >> 3.24 KW/coilRF SETTING: nu0=24.18717 MHz 24.18587 MHz Δf: 1,3 KHz
TRIMMER RANGE TUNING (~ 6 KHz)
MAIN SETTING TO CHANGE BEAM
12C6+
H2+
extraction
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EXTRACTION LAYOUT
VED1,2 = 50kV
Emax = 120kV/cm
4 PASSIVE MCs
ε ~ 60 %protons
Carbon ions
REXT =122 cm
260 AMeV
1 single turn
4 PASSIVE MCs
ε ~ 100 %
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BEAM DYNAMIC AT EXTRACTION
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CURRENT BEAM ESTIMATION
Protons by stripper
Carbon ions by EDs
Tra
nsm
ission
effi
cien
cy
Ion source 2 mA
Injection line
90 %
Central region
5 % (no buncher)
acceleration
90%
extraction60% C 100% p
P current 80 nA
C current 48 nA
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CONCLUSION
The final design of SCENT300 was completed and no other study is expected: the technical drawings of the iron steel are also accomplished out.
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GRAZIE !
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Coils parameters
Coil Parameters
Size 150x210 mm2
Current density 46.5 amp/mm2
Inner Radius 1420 mm
Distance from the M.P.
70 mm
Energy Stored 35 MJ
Nominal Current (I)
900÷1000 amp
Total current (NI) 1.48 Mamp
Max Magnetic field 4.4 tesla
Axial Force -9.09 MN
Average Hoop Stress (peak)
100 (110) MPa
ConservativeDesign
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-745000
-740000
-735000
-730000
-725000
-720000
-715000
0 2 4 6 8 10 12 14
1600000
1610000
1620000
1630000
1640000
1650000
1660000
1670000
1680000
0 2 4 6 8 10 12 14
12
3 4 56
7
891011
12
Vertical force (N)
TOT=-891 tons/coil
Radial force (N)
Average=166 tons/coil
FORCES EVALUATION ON THE COILS (J X B)
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1.4 1.45 1.5 1.55 1.695
100
105
110
115
r 0.33( )
MPa
r
1.4 1.45 1.5 1.55 1.65
4
3
2
1
0
1
r r 0.33( )
MPa
r
TENSILE STRESS
STRESS DISTRIBUTION IN THE COILS
1
Rout Rin Rin
Rout
r r 0.33( )
d 101.935MPa
HOOP STRESS
RADIAL STRESS
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Summary