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DESIGN STUDY OF MEDICAL CYCLOTRON SCENT300 Mario Maggiore on behalf of R&D Accelerator team Laboratori Nazionali del Sud Catania, Italy. CYCLOTRONS PROVIDING LIGHT IONS. SYNCHROTRONS are today used everywhere (japan, GSI, CNAO) for carbon beam therapy. IBA C235 RESISTIVE COILS. PROTONS.
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DESIGN STUDY OF MEDICAL CYCLOTRON SCENT300 Mario Maggiore on behalf of R&D Accelerator team Laboratori Nazionali del Sud Catania, Italy HIAT 2009, 9th June , Venice
CYCLOTRONS PROVIDING LIGHT IONS SYNCHROTRONS are today used everywhere (japan, GSI, CNAO) for carbon beam therapy IBA C235 RESISTIVE COILS PROTONS CYCLOTRONS ACCEL\VARIAN K250 SC IBA C400 INFN SCENT300 PROTONS CARBON IONS SC CYCLOTRON • compactness and simplicity • lower size and cost superconducting tech. • high beam modulation control fixed energy (ESS needed) HIAT 2009, 9th June , Venice
MAIN PARAMETERS HIAT 2009, 9th June , Venice
INJECTION LAYOUT Einj=25 AKeV Vinflect= 14 KV gapinflect= 6 mm Einflect= 23KV/cm Vdee inj=70 kV Bo=3,15 tesla ECR sources HIAT 2009, 9th June , Venice
CENTRAL REGION DESIGN Beam centering YC XC Energy gain Vertical focusing during first turns 250 AKeV/turn HIAT 2009, 9th June , Venice
MAGNETIC FIELD PROPERTIES HIAT 2009, 9th June , Venice
ISOCHRONIZATION LEVEL UNTIL THE PHASE VARIES WITHIN 20 DEG, THE MAGNETIC FIELD HAS TO MATCH THE ISOCHRONOUS ONE WITH A PRECISION OF ±5GAUSS (|ΔB/B|<10-4) HIAT 2009, 9th June , Venice
RF CAVITY DESIGN Emax= 15 MV/m fRF = 98 MHz, 4 th harmonic 50 kW power losses estimated HIAT 2009, 9th June , Venice
BEAM DYNAMIC STUDY structural resonance coupling resonance HIAT 2009, 9th June , Venice
WHAT APPENDS AT RESONANCE ZONE? Minimal transverse stability plot Solution? Jump these radii… but energy gain cannot increase too much HIAT 2009, 9th June , Venice
Radial beam envelop in two cases old magnetic design Qr Qr cm cm energy energy HIAT 2009, 9th June , Venice
AUTOELLIPSE TRANSPORT 950 970 990 930 1000 960 940 980 PR 920 1010 910 1020 900 1030 Number of turns 1040 R Ar=0.2 Ar=0.1 HIAT 2009, 9th June , Venice
VERTICAL BEAM DYNAMIC Vertical beam envelop Axial space phase HIAT 2009, 9th June , Venice
Trimming C12 to H2+: RF and MF change Bo=cost. RF Frequency scales 0,7 % Two beams mean two different operating RF frequencies small variation of the MF gauss Best solution: coils split into two parts (C400) HIAT 2009, 9th June , Venice
2nd way: change only the magnetic field fRF = cost Magnetic field difference between C12 and H2+ is larger, but RF freq. is kept constant (it needs only the fine tuning) gauss HIAT 2009, 9th June , Venice
Trimming by two correction coils HIAT 2009, 9th June , Venice
GOOD M. FIELD MATCHING MINIMIZING POWER LOSSES CC 1 CC VALLEY Less than 4 KW/COIL MAIN COIL HIAT 2009, 9th June , Venice
MAIN SETTING TO CHANGE BEAM PHASE SLIP CALCULATED BY EO MAGNETIC FIELD MATCHING 12C6+ H2+ extraction 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/coil RF SETTING: nu0=24.18717 MHz 24.18587 MHz Δf: 1,3 KHz TRIMMER RANGE TUNING (~ 6 KHz) HIAT 2009, 9th June , Venice
EXTRACTION LAYOUT VED1,2 = 50kV Emax = 120kV/cm 4 PASSIVE MCs ε~ 60 % protons REXT =122 cm 260 AMeV 1 single turn 4 PASSIVE MCs ε~ 100 % Carbon ions HIAT 2009, 9th June , Venice
BEAM DYNAMIC AT EXTRACTION HIAT 2009, 9th June , Venice
CURRENT BEAM ESTIMATION Carbon ions by EDs Protons by stripper HIAT 2009, 9th June , Venice
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. HIAT 2009, 9th June , Venice
GRAZIE ! HIAT 2009, 9th June , Venice
Coils parameters Conservative Design HIAT 2009, 9th June , Venice
FORCES EVALUATION ON THE COILS (J X B) Vertical force (N) TOT=-891 tons/coil 3 4 5 2 6 1 12 7 11 8 10 9 Radial force (N) Average=166 tons/coil HIAT 2009, 9th June , Venice
STRESS DISTRIBUTION IN THE COILS HOOP STRESS TENSILE STRESS RADIAL STRESS HIAT 2009, 9th June , Venice
Summary HIAT 2009, 9th June , Venice