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Title: Inertial confinement fusion target insertion via augmented mass free fall

Abstract

A critical concern in the fabrication of targets for inertial confinement fusion (ICF) is ensuring that the hydrogenic (D{sub 2} or DT) fuel layer maintains spherical symmetry. Solid layered targets have structural integrity, but lack the needed surface smoothness. Liquid targets are inherently smooth, but suffer from gravitationally induced sagging. One method to reduce the effective gravitational field environment is freefall insertion into the target chamber. Calculations of London-Van der Waals forces between liquid deuterium and plastic indicate that the maximum thickness of the equilibrium liquid layer in reduced gravitational environments is dependent on the net gravitational acceleration. Deceleration from gas drag limits the effective gravitational acceleration to >10{sup {minus}6} g thus restricting the symmetric fuel layer thickness to 3 {micro}m. The authors show that augmented mass methods (mounting the target to a high density mass) can further reduce the net acceleration, increasing the permissible thickness of the symmetric liquid layer.

Authors:
; ;  [1];  [2]
  1. General Atomics, San Diego, CA (United States). Fusion Group
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
OSTI Identifier:
505809
Report Number(s):
CONF-950905-
ISBN 0-7803-2970-8; TRN: 97:013502
DOE Contract Number:  
AC03-91SF18601
Resource Type:
Conference
Resource Relation:
Conference: 16. IEEE/NPSS symposium on fusion engineering, Champaign, IL (United States), 1-5 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of 1995 IEEE 16. symposium on fusion engineering. Volume 1; Miley, G.H.; Elliott, C. [eds.] [Univ. of Illinois, Urbana, IL (United States). Fusion Studies Lab.]; PB: 886 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; ICF DEVICES; PELLET INJECTION; FABRICATION; TARGETS; WEIGHTLESSNESS; THERMONUCLEAR REACTOR FUELING

Citation Formats

Fagaly, R L, Brown, L C, Stephens, R B, and Wittman, M D. Inertial confinement fusion target insertion via augmented mass free fall. United States: N. p., 1995. Web.
Fagaly, R L, Brown, L C, Stephens, R B, & Wittman, M D. Inertial confinement fusion target insertion via augmented mass free fall. United States.
Fagaly, R L, Brown, L C, Stephens, R B, and Wittman, M D. Sun . "Inertial confinement fusion target insertion via augmented mass free fall". United States.
@article{osti_505809,
title = {Inertial confinement fusion target insertion via augmented mass free fall},
author = {Fagaly, R L and Brown, L C and Stephens, R B and Wittman, M D},
abstractNote = {A critical concern in the fabrication of targets for inertial confinement fusion (ICF) is ensuring that the hydrogenic (D{sub 2} or DT) fuel layer maintains spherical symmetry. Solid layered targets have structural integrity, but lack the needed surface smoothness. Liquid targets are inherently smooth, but suffer from gravitationally induced sagging. One method to reduce the effective gravitational field environment is freefall insertion into the target chamber. Calculations of London-Van der Waals forces between liquid deuterium and plastic indicate that the maximum thickness of the equilibrium liquid layer in reduced gravitational environments is dependent on the net gravitational acceleration. Deceleration from gas drag limits the effective gravitational acceleration to >10{sup {minus}6} g thus restricting the symmetric fuel layer thickness to 3 {micro}m. The authors show that augmented mass methods (mounting the target to a high density mass) can further reduce the net acceleration, increasing the permissible thickness of the symmetric liquid layer.},
doi = {},
url = {https://www.osti.gov/biblio/505809}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
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