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A New Twist to IFE - Impact Ignition -

A New Twist to IFE - Impact Ignition -. M. Murakami Institute of Laser Engineering, Osaka University. In collaboration with H. Nagatomo, 1 K. Nishihara, 1 H. Shiraga, 1 H. Azechi, 1 Y. Izawa, 1 F. Ogando, 2 P. Velarde, 2 M. Perlado, 2 and S. Eliezer 3. Contents of talk

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A New Twist to IFE - Impact Ignition -

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  1. A New Twist to IFE-Impact Ignition - M. Murakami Institute of Laser Engineering, Osaka University In collaboration with H. Nagatomo,1 K. Nishihara,1 H. Shiraga,1 H. Azechi,1 Y. Izawa,1 F. Ogando,2 P. Velarde,2 M. Perlado,2 and S. Eliezer3 Contents of talk ・What is Impact Ignition!? ・Gain model ・Design window ・2D hydrodynamic simulation ・Cone shell experiments

  2. New Scheme: Impact Ignition- Target Structure and Flow Diagram -

  3. Advantages of Impact Ignition Simple Physics (2) High Efficiency (3) High Robustness (4) High Gain (5) Low Cost (6) No need for PW Laser

  4. Gain Model Implosion velocity Laser energy for igniter Laser energy for compression Total driver energy Burn fraction Energy gain

  5. Gain curves for Impact Ignition Targets

  6. Laser Indirect Laser Direct HIB Indirect HIB Indirect Impact Ignition can be designed in other illumination schemes

  7. Uniform implosion Non-uniform implosion Non-uniform implosion can achieve higher rR values.

  8. Efficiently compressed core can be generated even by nonuniform implosion Cone shell target X-ray image of the compressed fuel plasma Those experimental results have been published in Nature (2001 & 2003).

  9. Implosion experiment of cone-shell target at LLE OMEGA laser 200 mm x 200 mm CH shell:1000 mmf, 25 mmt, D2 5 atm Laser: 35 beams 15 kJ/1 ns SQ (8x1014W/cm2 ) 70deg Au cone core cone X-ray emission from core and cone tip Ultrafast x-ray image (Dt=10 ps) obtained with MIXS: Multi-Imaging X-ray Streak Camera with PJX at LLE by H. Shiraga, S. Fujioka, P. Jaanimagi, C. Stoeckl, et al.

  10. Different irradiation schemes for indirectly driven HIF- History of designs to kill low mode asymmetries -But those are for spherical fuel pellets!!

  11. Impact Ignition may allow us different beam options beyond standard parameters. I will talk a bit more details on this topic in US-Japan Workshop after this symposium.

  12. 2D Hydrodynamic Simulation Isocontour map at a time shortly before the impact Isocontour map at peak comp- ression shortly after the impact

  13. Hydrodynamic Efficiency

  14. Scaling laws for laser-driven ablation

  15. Design Window for Laser and Target Parameters

  16. High isentrope suppresses Rayleigh-Taylor Instability Under constant acceleration for

  17. Summary • A totally new ignition scheme, Impact Ignition, has been proposed. • Impact Ignition has very attractive features. • Major breakthrouh expected in future experiments is to demonstrate high implosion velocities at low isentropes.

  18. Direct drive for the igniter shell has much higher potential to achieve Impact Ignition than indirect drive Advantages: Laser pulse shape and irradiation timing can be rather freely designed. With high specific deposition power, the exhaust velocity and thus the implosion velocity is quite controllable. Experiment can be conducted under orthodox laser systems (Gekko XII) with no special know-how for the target fabrication and optical design and operation.

  19. In indirect scheme, it is hard to achieve high implosion velocities for the ignitor shell

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