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Title: Metrology Feasibility Study in Support of the National Direct-Drive Program

Journal Article · · Fusion Science and Technology
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  1. General Atomics, San Diego, CA (United States)
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The 100 Gbar Laser Direct Drive (LDD) program calls for ablator capsules with no defects larger than 0.5 μm in lateral dimension and fewer than ten defects with lateral dimensions between 0.1-0.5 μm. Comparing to Laser Indirect Drive (LID) capsules, this represents >10x reduction of defect length scale and >500x reduction in defect number density. This presents major challenges to both fabrication and metrology. In this paper, we will discuss the proof-of-principle work conducted at General Atomics to identify metrology techniques suitable for 100 Gbar target characterization. We present a detailed studies of dark-field imaging, laser scatterometry, and environmental scanning electron microscopes. We identify dark-field imaging as the best approach for meeting the 100 Gbar metrology needs.

Research Organization:
General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
NA0001808
OSTI ID:
1463658
Journal Information:
Fusion Science and Technology, Vol. 73, Issue 2; ISSN 1536-1055
Publisher:
American Nuclear SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (6)

Quantitative Data Analysis Method for Precision Radiography journal May 2009
Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility journal May 2011
Design of magnetized liner inertial fusion experiments using the Z facility journal July 2014
Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain journal November 1995
Laser-direct-drive program: Promise, challenge, and path forward journal March 2017
Scaling magnetized liner inertial fusion on Z and future pulsed-power accelerators journal February 2016

Figures / Tables (8)

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Laser direct drive
inertial confinement fusion
magnetized liner inertial fusion