DESIGN STUDY OF MEDICAL CYCLOTRON SCENT300

Mario Maggioreon behalf of R&D Accelerator teamLaboratori Nazionali del SudCatania, Italy

SYNCHROTRONS are today used everywhere (japan, GSI, CNAO) for carbon beam therapyCYCLOTRONSIBA C235 RESISTIVE COILSACCEL\VARIAN K250 SCPROTONSSC CYCLOTRONIBA C400

INFN SCENT300PROTONS

CARBON IONSCYCLOTRONS PROVIDING LIGHT IONS compactness and simplicity lower size and cost superconducting tech. high beam modulation control fixed energy (ESS needed)

MAIN PARAMETERS

INJECTION LAYOUTEinj=25 AKeVVinflect= 14 KVgapinflect= 6 mmEinflect= 23KV/cmVdee inj=70 kVBo=3,15 teslaECR sources

CENTRAL REGION DESIGNBeam centeringVertical focusing during first turnsEnergy gain250 AKeV/turnYCXC

MAGNETIC FIELD PROPERTIES

UNTIL THE PHASE VARIES WITHIN 20 DEG, THE MAGNETIC FIELD HAS TO MATCH THE ISOCHRONOUS ONEWITH A PRECISION OF 5GAUSS (|B/B|

RF CAVITY DESIGN50 kW power losses estimatedfRF = 98 MHz, 4 th harmonic Emax= 15 MV/m

BEAM DYNAMIC STUDYstructural resonancecoupling resonance

WHAT APPENDS AT RESONANCE ZONE?Solution?

Jump these radii

but energy gain

cannot increase

too much

Minimal transverse stability plot

Radial beam envelop in two casesold magnetic designenergyenergycmcmQrQr

Ar=0.2Ar=0.1

VERTICAL BEAM DYNAMICVertical beam envelopAxial space phase

Trimming C12 to H2+: RF and MF changeBo=cost.Best solution: coils split into two parts (C400)RF Frequency scales0,7 %Two beams mean two differentoperating RF frequenciessmall variation of the MFgauss

2nd way: change only the magnetic fieldfRF = costMagnetic field differencebetween C12 and H2+ is larger,but RF freq. is kept constant (it needs only the fine tuning) gauss

Trimming by two correction coils

GOOD M. FIELD MATCHINGMINIMIZING POWER LOSSESLess than 4 KW/COILMAIN COILCC 1CC VALLEY

PHASE SLIP CALCULATED BY EOMAGNETIC FIELD MATCHINGMAIN 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 f: 1,3 KHzTRIMMER RANGE TUNING (~ 6 KHz)MAIN SETTING TO CHANGE BEAM 12C6+H2+extraction

EXTRACTION LAYOUTVED1,2 = 50kV

Emax = 120kV/cm

4 PASSIVE MCs

~ 60 %protonsCarbon ionsREXT =122 cm

260 AMeV

1 single turn

4 PASSIVE MCs

~ 100 %

BEAM DYNAMIC AT EXTRACTION

CURRENT BEAM ESTIMATIONProtons by stripperCarbon ions by EDs

Transmission efficiencyIon source2 mAInjection line90 %Central region5 % (no buncher)acceleration90%extraction60% C 100% pP current 80 nAC current48 nA

CONCLUSIONThe final design of SCENT300 was completed and no other study is expected: the technical drawings of the iron steel are also accomplished out.

GRAZIE !

Coils parametersConservativeDesign

Coil ParametersSize150x210 mm2Current density 46.5 amp/mm2Inner Radius1420 mmDistance from the M.P.70 mmEnergy Stored35 MJNominal Current (I)9001000 ampTotal current (NI)1.48 MampMax Magnetic field 4.4 teslaAxial Force-9.09 MNAverage Hoop Stress (peak)100 (110) MPa

123456789101112Vertical force (N)

TOT=-891 tons/coilRadial force (N)

Average=166 tons/coilFORCES EVALUATION ON THE COILS (J X B)

Grafico1

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19mod_nodal

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Totalforceoncoil1=-2.28E-08-2.33E-090N

Totaltorqueoncoil1=00311.9242502Nm

Totaltorqueoncoil1=00311.9242501595Nm

0.00079998948.00E-04-0.0000000015

19MOD_INTEGRAL

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At144.405911-38.6934472-18force=1.57E+06-425042.01239172739691.10719341627618.31559326

At105.7124638-105.712464-18force=1.18E+06-1.18E+06719686.1720114121670366.59942425

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Totalforceoncoil1=-2.87E-058.45E-06

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Totaltorqueoncoil1=0032317.9811067699Ncm

Timeaveragevalues.

19MOD_INTEGRAL

dz=1mm

****COMMANDINPUT***BODYN1=16N2=16N3=16X0=0Y0=0Z0=0OMITSELF=NONE

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Timeaveragevalues.

****COMMANDINPUT***SETFIELD=NODALCOIL=NODAL

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dz=1mm

integral

nodal

integral2

nodal2

GRAFICI

GRAFICI

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0.0000084536

NODAL

INTEGRAL

FORZA ASSIALE

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NODAL

INTEGRAL

FORZA RADIALE

Grafico2

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19mod_nodal

****COMMANDINPUT***BODYN1=16N2=16N3=16X0=0Y0=0Z0=0RADIAL COMPONENT

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At1.0571246381.057124638-0.18force=1.18E+061.18E+06719180.2567112961670172.14207009

At1.444059110.386934472-0.18force=1.55E+06418568.486571395727105.6952704411610330.58701765

At1.44405911-0.38693447-0.18force=1.57E+06-425163.7812179739603.7591614541628009.79712108

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At0.386934472-1.44405911-0.18force=418568.486571394-1.55E+06727105.695270448743558.844572781610330.586824521636170.84199236

Totalforceoncoil1=-2.28E-08-2.33E-090N

Totalforceoncoil1=-2.28E-08-2.33E-090N

Totaltorqueoncoil1=00311.9242502Nm

Totaltorqueoncoil1=00311.9242501595Nm

0.00079998948.00E-04-0.0000000015

19MOD_INTEGRAL

At-38.6934472-144.40591118force=-425042.01239754-1.57E+06-739691.10719341627618.3159809

At-105.712464-105.71246418force=-1.18E+06-1.18E+06-719686.172011421670366.59942425

At-144.405911-38.693447218force=-1.56E+06-418604.76595378-727393.482167431610513.22449617

At-144.40591138.6934472418force=-1.57E+06425042.012392281-739691.107193391627618.31597953

At-105.712464105.712463818force=-1.18E+061.18E+06-719686.172011431670366.59935356

At-38.6934472144.40591118force=-418604.765952161.56E+06-727393.482167431610513.22449575

At38.69344724144.40591118force=425042.0123930761.57E+06-739691.107193411627618.31559362

At105.7124638105.712463818force=1.18E+061.18E+06-719686.172011411670366.59942429

At144.40591138.6934472418force=1.56E+06418604.765953108-727393.482167441610513.224496

At144.405911-38.693447218force=1.57E+06-425042.01239172-739691.10719341627618.31559326

At105.7124638-105.71246418force=1.18E+06-1.18E+06-719686.172011411670366.59942425

At38.69344724-144.40591118force=418604.765953192-1.56E+06-727393.48216745-8747083.045489021610513.224496021636166.04656314

At-38.6934472-144.405911-18force=-425042.01239754-1.57E+06739691.1071934011627618.3159809

At-105.712464-105.712464-18force=-1.18E+06-1.18E+06719686.1720114191670366.59942425

At-144.405911-38.6934472-18force=-1.56E+06-418604.76595378727393.482167431610513.22449617

At-144.40591138.69344724-18force=-1.57E+06425042.012392281739691.1071933911627618.31597953

At-105.712464105.7124638-18force=-1.18E+061.18E+06719686.1720114291670366.59935356

At-38.6934472144.405911-18force=-418604.765952161.56E+06727393.4821674251610513.22449575

At38.69344724144.405911-18force=425042.0123930761.57E+06739691.1071934061627618.31559362

At105.7124638105.7124638-18force=1.18E+061.18E+06719686.1720114131670366.59942429

At144.40591138.69344724-18force=1.56E+06418604.765953108727393.482167441610513.224496

At144.405911-38.6934472-18force=1.57E+06-425042.01239172739691.10719341627618.31559326

At105.7124638-105.712464-18force=1.18E+06-1.18E+06719686.1720114121670366.59942425

At38.69344724-144.405911-18force=418604.765953192-1.56E+06727393.4821674478747083.045489011610513.224496021636166.04656314

Totalforceoncoil1=-2.87E-058.45E-06

Totalforceoncoil1=-2.87E-058.45E-06

Totaltorqueoncoil1=00.00E+003.23E+04Ncm

Totaltorqueoncoil1=0032317.9811067699Ncm

Timeaveragevalues.

19MOD_INTEGRAL

dz=1mm

****COMMANDINPUT***BODYN1=16N2=16N3=16X0=0Y0=0Z0=0OMITSELF=NONE

At-38.6934472-144.40591118.1force=-425151.70217531-1.57E+06-739468.47102501

At-105.712464-105.71246418.1force=-1.18E+06-1.18E+06-719160.9610742

At-144.405911-38.693447218.1force=-1.56E+06-418712.04886793-727174.29370378

At-144.40591138.6934472418.1force=-1.57E+06425151.702170041-739468.471025

At-105.712464105.712463818.1force=-1.18E+061.18E+06-719160.96107421

At-38.6934472144.40591118.1force=-418712.048866321.56E+06-727174.29370377

At38.69344724144.40591118.1force=425151.7021708351.57E+06-739468.47102501

At105.7124638105.712463818.1force=1.18E+061.18E+06-719160.9610742

At144.40591138.6934472418.1force=1.56E+06418712.048867263-727174.29370379

At144.405911-38.693447218.1force=1.57E+06-425151.70216948-739468.47102501

At105.7124638-105.71246418.1force=1.18E+06-1.18E+06-719160.9610742

At38.69344724-144.40591118.1force=418712.048867346-1.56E+06-727174.2937038-8743214.90321198

At-38.6934472-144.405911-17.9force=-424934.62893086-1.57E+06739913.131939528

At-105.712464-105.712464-17.9force=-1.18E+06-1.18E+06720208.366161773

At-144.405911-38.6934472-17.9force=-1.55E+06-418499.05817492727613.264509976

At-144.40591138.69344724-17.9force=-1.57E+06424934.628925593739913.131939516

At-105.712464105.7124638-17.9force=-1.18E+061.18E+06720208.366161783

At-38.6934472144.405911-17.9force=-418499.05817331.55E+06727613.264509971

At38.69344724144.405911-17.9force=424934.6289263861.57E+06739913.131939531

At105.7124638105.7124638-17.9force=1.18E+061.18E+06720208.366161766

At144.40591138.69344724-17.9force=1.55E+06418499.058174244727613.264509986

At144.405911-38.6934472-17.9force=1.57E+06-424934.62892504739913.131939525

At105.7124638-105.712464-17.9force=1.18E+06-1.18E+06720208.366161764

At38.69344724-144.405911-17.9force=418499.058174327-1.55E+06727613.2645099928750939.05044511

7724.1472331331

Totalforceoncoil1=-2.87E-058.47E-067724.147233N

Totalforceoncoil1=-2.87E-058.47E-067724.1472331523N

Totaltorqueoncoil1=-1.34E-07-2.24E-0632320.00158Ncm

Totaltorqueoncoil1=-1.34E-07-2.24E-0632320.0015794305Ncm

Timeaveragevalues.

****COMMANDINPUT***SETFIELD=NODALCOIL=NODAL

****COMMANDINPUT***BODYN1=16N2=16N3=16X0=0Y0=0Z0=0OMITSELF=NONE

At-38.6934472-144.40591118.1force=-425197.34998912-1.57E+06-762244.01792131

At-105.712464-105.71246418.1force=-1.18E+06-1.18E+06-741455.3527445

At-144.405911-38.693447218.1force=-1.56E+06-418591.93706908-749763.82424085

At-144.40591138.6934472418.1force=-1.57E+06425197.349989116-762244.01792131

At-105.712464105.712463818.1force=-1.18E+061.18E+06-741455.35274451

At-38.6934472144.40591118.1force=-418591.937069081.56E+06-749763.82424085

At38.69344724144.40591118.1force=425197.3499891151.57E+06-762244.01792131

At105.7124638105.712463818.1force=1.18E+061.18E+06-741455.3527445

At144.40591138.6934472418.1force=1.56E+06418591.937069076-749763.82424085

At144.405911-38.693447218.1force=1.57E+06-425197.34998912-762244.01792131

At105.7124638-105.71246418.1force=1.18E+06-1.18E+06-741455.3527445

At38.69344724-144.40591118.1force=418591.937069075-1.56E+06-749763.82424085-9013852.77962665

At-38.6934472-144.405911-17.9force=-425130.12075126-1.57E+06716974.33627219

At-105.712464-105.712464-17.9force=-1.18E+06-1.18E+06696944.112052638

At-144.405911-38.6934472-17.9force=-1.55E+06-418551.81162116704438.065190562

At-144.40591138.69344724-17.9force=-1.57E+06425130.120751256716974.336272194

At-105.712464105.7124638-17.9force=-1.18E+061.18E+06696944.112052641

At-38.6934472144.405911-17.9force=-418551.811621161.55E+06704438.065190563

At38.69344724144.405911-17.9force=425130.1207512551.57E+06716974.336272193

At105.7124638105.7124638-17.9force=1.18E+061.18E+06696944.112052638

At144.40591138.69344724-17.9force=1.55E+06418551.811621155704438.065190561

At144.405911-38.6934472-17.9force=1.57E+06-425130.12075126716974.336272188

At105.7124638-105.712464-17.9force=1.18E+06-1.18E+06696944.112052636

At38.69344724-144.405911-17.9force=418551.811621154-1.55E+06704438.0651905598473426.05406156

-509124.171995106

Totalforceoncoil1=-2.47E-08-5.82E-09-540426.726N

Totalforceoncoil1=-2.47E-08-5.82E-09-540426.72556511N

Totaltorqueoncoil1=-1.94E-07-7.45E-0931302.55357Ncm

Totaltorqueoncoil1=-1.94E-07-7.45E-0931302.5535681143Ncm

dz=1mm

integral

nodal

integral2

nodal2

GRAFICI

GRAFICI

-739603.75916146-719686.17201141

-719180.2567113-727393.48216744

-727105.69527044-739691.1071934

-739603.75916146-719686.17201141

-719180.2567113-727393.48216745

-727105.69527044739691.107193401

-739603.75916146719686.172011419

-719180.2567113727393.48216743

-727105.69527044739691.107193391

-739603.75916145719686.172011429

-719180.25671129727393.482167425

-727105.69527044739691.107193406

719686.172011413

727393.48216744

739691.1071934

719686.172011412

727393.482167447

0.0000084536

NODAL

INTEGRAL

FORZA ASSIALE

1628009.796638431670366.59942429

1670172.142282371610513.224496

1610330.586824521627618.31559326

1628009.796638431670366.59942425

1670172.142423751610513.22449602

1610330.587017651627618.3159809

1628009.797121081670366.59942425

1670172.142070091610513.22449617

1610330.587017651627618.31597953

1628009.797121081670366.59935356

1670172.141928711610513.22449575

1610330.586824521627618.31559362

1670366.59942429

1610513.224496

1627618.31559326

1670366.59942425

1610513.22449602

NODAL

INTEGRAL

FORZA RADIALE

TENSILE STRESSSTRESS DISTRIBUTION IN THE COILSHOOP STRESSRADIAL STRESS

Summary