1. Forschungszentrum Dresden Rossendorf Trevor Burris, Ph.D. Candidate Beam Transport for Laser Accelerators - A Brief Overview of Work at FZD 17 August 2009, GSI Darmstadt

2. Outline Present Designs - Capacitor - Lens - Current Feed-throughs Simulation Results for Present Lenses Eddy Currents - Target Movement - Shielding Next Design - Luft-Spule

3. Present Capacitor and Solenoid Solenoid: 4 Layers, 30 Turns per Layer L = 350 μH r in = 27 mm l = 150 mm Capacitor: C = 250 μF Q 0 = 4.0 C V max = 16 kV t rise = 465 μs I max = 13.5 kA B max ~ 12 T Coil Current Voltage Divider Crowbar Diode Current w/ 0.5 Ω

4. Present Coil and Vacuum Feed Through Notch for parabolic mirror alignment Focal length fixed to 10 cm for FZD's target chamber.

5. Outline Present Designs - Capacitor - Lens Simulation Results for Present Lenses Eddy Currents - Target Movement - Shielding Next Design - Luft-Spule

6. Simulated Fields and Particle Tracing GPT - B-fields - Particle Tracking Comsol- B-fields [cm] 3 MeV 7 MeV 12 MeV Simulated focusing of 3, 7, and, 12 MeV proton beams of 10° half-angles

7. Outline Present Designs - Capacitor - Lens Simulation Results for Present Lenses Eddy Currents - Target Movement - Shielding Next Design - Luft-Spule

8. Eddy Currents: Effects of dB/dt Questions regarding induced forces: 1) Are they destructive? 2) Will they move objects inside the Target Chamber? 3) What is the magnitude of motion, when does it occur, and is the object elastic? O.D. Optical Board P.S. Diode Lenses LASERLASER Capacitor Test Pit part to be tested B 2D

9. Eddy Currents: 65 mm Al Foil Target, 10cm from coil, Plastic Holder laser

10. 3 kV6 kV9 kV 12 kV14 kV 16 kV, maximum voltage Eddy Currents: 65 mm Al Foil Target, 10cm from coil Coil CurrentCrowbar Diode Current X rotation Y rotation (I = 13.5 kA, B max ~ 12.3 T)

11. Eddy Currents: 65 mm Al Foil Target, 10cm from coil (I = 13.5 kA, B max ~ 11.5 T) (I = 13.5 kA, B max ~ 12.3 T) 16 kV, maximum voltage Al Shield 13 um Al target Lens

12. Eddy Shielding Al dB/dt = 538 Hz

13. Outline Present Designs - Capacitor - Lens Simulation Results for Present Lenses Eddy Currents - Target Movement - Shielding Next Design - Luft-Spule

14. Next Lens Design - Designed to operate in air - Cooling line around coil - Housing - acts as eddy-shield - eliminates G10 outgassing concerns

15. Present Development at FZD 1) Aperture + perm. Dipole - under construction for first radio-biology experiments 2) 2 perm. Quadrupoles + perm. Dipole - construction complete - characterization on 10 MeV tandem this or next week - placement in laser chamber to follow 3) Pulsed Solenoid (and Pulsed Bending Magnets) - construction complete (2 coils), design for luftspule in progress - G10 outgassing tests in the next weeks - characterization on 10 MeV tandem in the next month - placement in laser chamber to follow 4) Next Capacitor is being designed