Nucl. Instrum. & Meth. in Phys. Res. A544 (2005) 67 M. Murakami

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NRL Experiments in Support of High Gain Target Designs*

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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

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

Gain curves for Impact Ignition Targets

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

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

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

Temporal evolution of density profile

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

Experiment Laser: Gekko/HIPER: tL = 2.5ns (super-Gaussian) lL = 0.35 mm IL = 4x1014 W/cm2 Target: 14 - 20 mm, Br-doped plastic planar target (CHBr) Polystylen (CH)

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

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

Design Window for Laser and Target Parameters

Kritical issues that should be addressed

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.