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Forschungszentrum Dresden Rossendorf

Beam Transport for Laser Accelerators - A Brief Overview of Work at FZD. Forschungszentrum Dresden Rossendorf. Trevor Burris, Ph.D. Candidate. 17 August 2009, GSI Darmstadt. Outline. Present Designs - Capacitor - Lens - Current Feed-throughs Simulation Results for Present Lenses

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Forschungszentrum Dresden Rossendorf

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  1. Beam Transport for Laser Accelerators - A Brief Overview of Work at FZD Forschungszentrum Dresden Rossendorf Trevor Burris, Ph.D. Candidate 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 rin = 27 mm l = 150 mm Capacitor: C = 250 μF Q0 = 4.0 C Vmax = 16 kV Coil Current trise = 465 μs Imax = 13.5 kA Bmax ~ 12 T Crowbar Diode Current w/ 0.5 Ω Voltage Divider

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

  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? Capacitor Test Pit O.D. P.S. Diode LASER Lenses Optical Board B 2D part to be tested

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

  10. Eddy Currents: 65 mm Al Foil Target, 10cm from coil Coil Current Crowbar Diode Current X rotation Y rotation 3 kV 6 kV 9 kV 16 kV, maximum voltage 12 kV 14 kV (I = 13.5 kA, Bmax ~ 12.3 T)

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

  12. Eddy Shielding dB/dt = 538 Hz Al Al

  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

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