1. Toward Realization of Hyper-velocities for Impact Fusion Ignition (I F I)
Nucl. Instrum. & Meth. in Phys. Res. A544 (2005) 67
M. Murakami
　　　Institute of Laser Engineering, Osaka University
ILE H. Azechi, H. Nagatomo, T. Sakaiya, S. Fujioka, H. Shiraga, M. Nakai, K. Shigemori
NRL S. Obenschain, M. Karasik, J. Gardner, J. Bates, D. Colombant, J. Weaver, Y. Aglitskiy
Contents of talk
・Introduction to I F I
・2D simulation
・First experiment
・Critical issues

2. Advantages of Impact Ignition
Simple Physics
(2) High Gain
(3) Low Cost

3. Gain curves for Impact Ignition Targets

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

5. Shock tube problem to estimate the necessary implosion velocity
Impactor
Main fuel

6. More realistic velocities would be 1-2 x 108 cm/s

7. Temporal evolution of density profile

9. 1D Radiation-hydrodynamic simulation shows that hyper
velocities ~ 108 cm/s can be achieved under proper conditions.

10. Experiment Laser: Gekko/HIPER: tL = 2.5ns (super-Gaussian)
lL = 0.35 mm
IL = 4x1014 W/cm2
Target: mm,
Br-doped plastic planar target (CHBr)
Polystylen (CH)

11. High Intensity Plasma Experimental Research (HIPER)
HIPER and NIKE are the only facilities that can explore impact ignition
Target:
CH, CHBr
Focal length = 500 cm
Effective F# = 3
KDP
Foot pulse
Wavelength: 0.53 mm (2w)
Energy: 0.5 kJ
Intensity: ~ 1012 W/cm2
Beam smoothing: PCL
Main pulse
Wavelength: 0.35 mm (3w)
Energy: 5 kJ
Intensity: ~ 1014 W/cm2
Beam smoothing: 2-D SSD

12. We have observed a maximum velocity, 6x107 cm/s, ever achieved

13. Design Window for Laser and Target Parameters

14. Kritical issues that should be addressed

15. Summary Preliminary 2D simulation in full geometry
has achieved key numbers such as
V = 108 cm/s, r = 400 g/cm3, T = 5 keV
(2) First experiment has demonstrated a maximum velocity, V = 6 x107 cm/s, ever achieved.
(3) Further research is now being programmed under
ILE/NRL collaboration toward realization of IFI.