contributions on Particle therapy Magnets for Accelerators Gantries 2 contributions on magnet design fast ramping SC magnets Special Magnet for experiment ID: 998614
Download Presentation The PPT/PDF document "Medical Applications 6" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. Medical Applications6 contributions on Particle therapy: Magnets for Accelerators Gantries2 contributions on magnet design: fast ramping SC magnetsSpecial Magnet for experiment100 Tm (1.5 T)300 Tm (4.5 T)1 T/sMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI1
2. SC Cyclotronfor PET Isotope ProductionMEVION S250Very small / light cyclotronFor therapyJoseph Minervini, MITEasy to operateSmall footprintCoil constructionMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI2
3. CONCLUSION:SC magnets in a cyclotron make sense: lighter and smallerIronless or nearly ironless cyclotrons are feasible Ironless Synchrocyclotron Shielding coilsMain coilMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI3Joseph Minervini, MIT
4. Gantries:Yoshiyuki Iwata, NIRSMarco Schippers, PSIAlex Gerbershagen, PSI Medical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI4
5. scanningUp-stream scanning: + parallel+ small gantry radius+ small spots possible - wide aperture SC magnetDown-stream scanning: + small aperture, - large radius because of SAD- small spots difficult SAD = 1.5 mX Y X YRgantryRgantryMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI5
6. Combined function SC magnets （BM01～BM06） →No quadrupole magnet requiredScanning magnets on top →Large scan sizeCombined function SC magnets →Square irradiation field →Parallel beam Medical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI6Yoshiyuki Iwata, NIRSCurved 18-26 degr~3 T0.3 T/sLHe free
7. Alex Gerbershagen, PSI Marco Schippers, PSIGantry2 SC magnetsMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI7Keep fast E change: dB/dt > 10%/s (≈ 0.8 T/s)
8. Beam Optics Gantry-2: NC & SCQML1QML2AML1QML3QML4AML2QML5QML6QML7WMLTWMLUAML3KMB1KMB1UPG3MD23MBH3MBH4KMB2MBC1MBC2BMB2SML1MLP1QMLCMLP3SML2HML1MLP5SML3HML2ISO3END Gantry 2 optics: Momentum acceptance: Δp/p = 0.7 %Dispersion (1%dp)D=0SMD5QD13QD14AMLAAMLBAMLCQML1QML2QML3QML4AMLDAMLEAMLFQ33Q34QML5AML4QML6AML6QML7KMB1UPG3MD17MD23MBHSWM 3 x 20° bending magnets3 x 20° bending magnets2 x 45° bending magnets+3 quadrupolesSC Bending sections: dipole +combined Q+D : dispersion suppression => Very large momentum acceptance: Δp/p > 10 %Alex Gerbershagen, PSI Marco Schippers, PSIMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI8D=0
9. Medical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSIAchromatic POSITION of pencil beam CONSTANT for all E BUT : pencil beam size will vary with E => imaging correction necessary with two nc quads9Large energy acceptance: 20% Energy modulation (≈30% of Range) without dB/dtAlex Gerbershagen, PSI 9
10. Shlomo Caspi and Lucas Brouwer, LBNLMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI10Canted Coil SolenoidCanted Cosine ThetaCurvedmultipolesMandrels easy winding
11. The CCT advantages:reduce stress, improve training and “short-sample” expectation, field quality etcThe CCT design is well suited for curved SC gantry magnetsMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI11Shlomo Caspi Lucas Brouwer, LBNLMulti layer options
12. Fabricatore, INFN100 Tm (1.5 T)300 Tm (4.5 T)1 T/sSIS300 dipoles: fast cycled and curved magnet1- Persistent currents in SC filaments Field quality is depressed at low field. This effect is independent on ramp rate2- Inter-filaments/strands coupling currents ac losses and perturbation of field quality. IMPORTANT PARAMETERS:Filament diameterNr strandsInterfilament matrixMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI12
13. Conclusions:dB/dt : limitations are mainly determined by ac losses. few T/s => eddy currents in metallic structures and yokes,However: field quality OKIntrastrand coupling currents: major source of field quality perturbationMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI13A low loss wire will be one of the main issues for future developmentsFabricatore, INFN
14. Renuka Rajput Ghoshal , Jefferson LabMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI14
15. Design Iterations:Cryogenic Cooling DesignOriginal DesignOptimized DesignPressureAtmSub-atmLHe temp4.2K3.6KTemp Margin1.12K1.71KSC Correction coilsOriginal DesignOptimized DesignLocationOD of main magnet coils (far from target area)Inside the bore – (close to target area)SizeLarge (Ø ~1.5m)Small (Ø ~50mm)CommentNeeds very strong coils to compensate for field uniformityNeeds less field & easier to assembleFinal design will be based on field map of the rest of the magnetMedical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI15Renuka Rajput Ghoshal , Jefferson Lab
16. DiscussionDamage, distinguish:Low dose (rate) damage of insulationMedium doses heating of SC or NC matrix: quench riskTypes of SC:Experiences, Nb3Sn, HTC: almost “normally used”Power vs energy consumption in dB/dt (cryocoolers use ~8kW) Medical Applications Summary BeMa workshop dec. 2014 Marco Schippers,PSI16