First hohlraum drive studies on the National Ignition Facility
- LLNL, P.O. Box 808, Livermore, California 94550 (United States)
The first hohlraum experiments on the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Nucl. Fusion 44, 228 (2004)] using the first four laser beams have activated the indirect-drive experimental capabilities and tested radiation temperature limits imposed by hohlraum plasma filling. Vacuum hohlraums have been irradiated with laser powers up to 9 TW, 1 to 9 ns long square pulses and energies of up to 17 kJ to study the hohlraum radiation temperature scaling with the laser power and hohlraum size, and to make contact with hohlraum experiments performed previously at other laser facilities. Furthermore, for a variety of hohlraum sizes and pulse lengths, the measured x-ray flux shows signatures of plasma filling that coincide with hard x-ray emission from plasma streaming out of the hohlraum. These observations agree with hydrodynamic simulations and with analytical modeling that includes hydrodynamic and coronal radiative losses. The modeling predicts radiation temperature limits on full NIF (1.8 MJ) that are significantly greater than required for ignition hohlraums.
- OSTI ID:
- 20783163
- Journal Information:
- Physics of Plasmas, Vol. 13, Issue 5; Other Information: DOI: 10.1063/1.2178783; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPUTERIZED SIMULATION
ELECTRON TEMPERATURE
HARD X RADIATION
ICF DEVICES
ION TEMPERATURE
IRRADIATION
LASERS
LIGHT TRANSMISSION
PLASMA
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA SIMULATION
PULSES
THERMONUCLEAR IGNITION
US NATIONAL IGNITION FACILITY
X-RAY SOURCES