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Correcting Hohlraum Drive Asymmetry with Glow Discharge Polymerization Coated Capsule Shims

Journal Article · · Fusion Science and Technology
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3]
  1. General Atomics, San Diego, CA (United States); General Atomics
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
+ Show Author Affiliations

In inertial confinement fusion target design, the shape discrepancy between the cylindrical hohlraum and the spherical capsule creates a low mode asymmetry in the implosion. One way to correct such asymmetry is to shim the target capsule surface with extra mass in specific locations following a 3D P4 Legendre mode. Previously, the desired surface pattern was precision machined out of the capsule. The resulting 2DConA experiments that investigated the implosion’s shape demonstrated the shimming method’s success. However, machining leaves large defects on the capsule surface which will degrade neutron yield in a DT implosion. An alternative shimming approach is to grow the pattern on the capsule surface using a glow discharge polymerization coating process in a stencil lithography application. In this study, we discuss the fabrication, characterization and challenges of making shimmed target capsules with this new method.

Research Organization:
General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
NA0001808; 89233118CNA000010; AC52-07NA27344
OSTI ID:
2007805
Journal Information:
Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 7 Vol. 79; ISSN 1536-1055
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

Predicting mask distortion, clogging and pattern transfer for stencil lithography journal January 2007
Fabrication of capsules with angle-dependent gold shims for hohlraum drive symmetry correction
  • Nikroo, A.; Pontelandolfo, J.; Greenwood, A. L.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 544, Issue 1-2 https://doi.org/10.1016/j.nima.2005.01.193
journal May 2005
Fabrication of one-dimensional programmable-height nanostructures via dynamic stencil deposition journal July 2008
Theoretical model of thin-film deposition profile with shadow effect journal May 1979
Exploring the limits of case-to-capsule ratio, pulse length, and picket energy for symmetric hohlraum drive on the National Ignition Facility Laser journal May 2018
Capsule Shimming Developments for National Ignition Facility (NIF) Hohlraum Asymmetry Experiments journal December 2017
Complete Surface Mapping of ICF Shells journal March 2004

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Glow discharge polymer
fusion
hohlraum
inertial confinement fusion
shim