1. Medical Applications 6 contributions on Particle therapy: Magnets for
Accelerators
Gantries
2 contributions on magnet design:
fast ramping SC magnets
Special Magnet for experiment
100 Tm (1.5 T)
300 Tm (4.5 T)
1 T/s
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

2. Joseph Minervini, MIT MEVION S250 Very small / light cyclotron
For therapy
Coil construction
SC Cyclotron
for PET Isotope Production
Easy to operate
Small footprint
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

3. Joseph Minervini, MIT CONCLUSION: Ironless Synchrocyclotron
Shielding coils
Main coil
CONCLUSION:
SC magnets in a cyclotron make sense: lighter and smaller
Ironless or nearly ironless cyclotrons are feasible
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

4. Gantries: Yoshiyuki Iwata, NIRS Marco Schippers, PSI
Alex Gerbershagen, PSI
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

5. scanning Down-stream scanning: + small aperture,
- large radius because of SAD
- small spots difficult
X Y
Rgantry
X Y
Rgantry
Up-stream scanning:
+ parallel
+ small gantry radius
+ small spots possible
- wide aperture SC magnet
SAD = 1.5 m
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

6. Yoshiyuki Iwata, NIRS Curved 18-26 degr ~3 T 0.3 T/s LHe free
Combined function SC magnets
（BM01～BM06）
　→No quadrupole magnet required
Scanning magnets on top
　→Large scan size
　→Square irradiation field
　→Parallel beam
Curved degr
~3 T
0.3 T/s
LHe free
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

7. Keep fast E change: dB/dt > 10%/s (≈ 0.8 T/s)
Alex Gerbershagen, PSI
Marco Schippers, PSI
Gantry2  SC magnets
Keep fast E change: dB/dt > 10%/s (≈ 0.8 T/s)
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

8. Beam Optics Gantry-2: NC & SC
Alex Gerbershagen, PSI
Marco Schippers, PSI
Beam Optics Gantry-2: NC & SC
Gantry 2 optics: Momentum acceptance: Δp/p = 0.7 % Q M L 1 2 A 3 4 5 6 7 W T U K B P G D H C S I O E N
D=0
Dispersion (1%dp)
SC Bending sections: dipole +combined Q+D : dispersion suppression
=> Very large momentum acceptance: Δp/p > 10 %
D=0 S M D 5 Q 1 3 4 A L B C 2 E F 6 7 K U P G H
2 x 45°
bending magnets
+3 quadrupoles
3 x 20°
bending
magnets
3 x 20°
bending
magnets W S M
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

9. Alex Gerbershagen, PSI
Large energy acceptance:  20% Energy modulation
(≈30% of Range) without dB/dt
Achromatic  POSITION of pencil beam CONSTANT for all E
 BUT : pencil beam size will vary with E
=> imaging correction necessary with two nc quads
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI 9

10. Shlomo Caspi and Lucas Brouwer, LBNL
Canted Coil Solenoid
Canted Cosine Theta
Mandrels
 easy winding
Curved
multipoles
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

11. Shlomo Caspi Lucas Brouwer, LBNL Multi layer options
 The CCT advantages:reduce stress, improve training and “short-sample” expectation, field quality etc
The CCT design is well suited for curved SC gantry magnets
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

12. SIS300 dipoles: fast cycled and curved magnet
Fabricatore, INFN
100 Tm (1.5 T)
300 Tm (4.5 T)
1 T/s
SIS300 dipoles: fast cycled and curved magnet
Field quality is depressed at low field. This effect is independent on ramp rate
1- Persistent currents in SC filaments 
2- Inter-filaments/strands coupling currents 
ac losses and perturbation of field quality.
IMPORTANT PARAMETERS:
Filament diameter
Nr strands
Interfilament matrix
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

13. Fabricatore, INFN Conclusions:
dB/dt : limitations are mainly determined by ac losses.
few T/s => eddy currents in metallic structures and yokes,
However: field quality OK
Intrastrand coupling currents: major source of field quality perturbation
A low loss wire will be one of the main issues for future developments
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

14. Renuka Rajput Ghoshal , Jefferson Lab
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

15. Design Iterations: Renuka Rajput Ghoshal , Jefferson Lab
Cryogenic Cooling Design
Original Design
Optimized Design
Pressure
Atm
Sub-atm
LHe temp
4.2K
3.6K
Temp Margin
1.12K
1.71K
SC Correction coils
Original Design
Optimized Design
Location
OD of main magnet coils (far from target area)
Inside the bore – (close to target area)
Size
Large (Ø ~1.5m)
Small (Ø ~50mm)
Comment
Needs very strong coils to compensate for field uniformity
Needs less field & easier to assemble
Final design will be based on field map of the rest of the magnet
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI

16. Discussion Damage, distinguish: Low dose (rate)  damage of insulation
Medium doses  heating of SC or NC matrix: quench risk
Types of SC:
Experiences,
Nb3Sn, HTC: almost “normally used”
Power vs energy consumption in dB/dt (cryocoolers use ~8kW)
Medical Applications Summary BeMa workshop dec Marco Schippers,PSI