Symmetry experiments in gas filled Hohlraums at Nova

Journal Article · Wed May 01 00:00:00 EDT 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.50525· OSTI ID:397209

Delamater, N D ^[1]; Murphy, T J ^[2]; Hauer, A A ^[1]; Kauffman, R L ^[2]; Richard, A L ^[3]; Lindman, E L; Magelssen, G R; Wilde, B H ^[1]; Powers, L V; Pollaine, S M; Suter, L J ^[2]; Chrien, R; Harris, D B ^[1]; Nelson, M B; Cable, M D; Moore, J B ^[2]; Gifford, K ^[4]; Wallace, R J ^[2]

---

1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
3. Centre D`Etudes De Limeil-Valenton (France)
4. General Atomics, San Diego, California (United States)

Understanding drive symmetry in gas filled hohlraums is currently of interest because the baseline design of the indirect drive ignition target for the planned National Ignition Facility uses a gas filled hohlraum. We report on the results of a series of experiments performed at the Nova laser facility at Lawrence Livermore National Laboratory with the goal of understanding time dependent drive symmetry in gas filled hohlraums. Time dependent symmetry data from implosions in gas filled hohlraums will be discussed. The purpose of filling the hohlraum with gas is to tamp the motion of the high-{ital Z} material ablating from the hohlraum walls, reducing the motion of the laser deposition regions and resultant temporal variations in drive symmetry. We have obtained time integrated and time resolved x-ray images of the implosion of plastic deuterium filled capsules, neutron yields, implosion times and spectroscopy of argon emission from the imploded core. Preliminary results show that the gas is effective in impeding the motion of the wall blowoff material, and that the resulting implosion is in qualitative agreement with modeling. These experiments are relevant to those currently being planned for the National Ignition Facility. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Los Alamos National Laboratory
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 397209
• Report Number(s): CONF-950476--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 369; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DEUTERIUM TARGET
FUSION YIELD
IMAGES
INERTIAL CONFINEMENT
LASER IMPLOSIONS
LASER TARGETS
THERMONUCLEAR IGNITION
THERMONUCLEAR REACTIONS
X-RAY DETECTION