Physics – Plasma Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..dpp..3e12l&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 10-15, 1996, abstract #3E.12
Physics
Plasma Physics
Scientific paper
For laser-driven hohlraums, certain classes of radiation-hydrodynamic phenomena such as diffusive radiation transport and hydrodynamic instability growth scale favorably with longer x-ray drives. Hence a campaign to design, characterize and use longer (5-20 ns), near-constant temperature x-ray drives has begun at the Nova laser facility. The long drives are created by staggering laser beams to maximize the extractable 3ω laser energy. Time-resolved radiation temperatures between 75 and 100 eV have been demonstrated in up to 5 mm diameter hohlraums with only 2 TW input laser power. The temperatures, after correcting for diagnostic hole closure as monitored by soft x-ray gated imagers, equal or exceed simple analytic estimates. 15 ns duration x-ray drives have then been used to observe radiation transport along empty tubes and in gasses. Present results are also used to normalize simple scaling laws predicting future capabilities on larger lasers such as the HELEN Upgrade and NIF.
Bach Dorothy
Bauer James
Hammel Bruce A.
Hammer Jay A.
Kilkenny Joseph D.
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