Random vibration sensitivity studies of modeling uncertainties in the NIF structures

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The National Ignition Facility is a laser fusion project that will provide an above-ground experimental capability for nuclear weapons effects simulation. This facility will achieve fusion ignition utilizing solid-state lasers as the energy driver. The facility will cover an estimated 33,400 m{sup 2} at an average height of 5--6 stories. Within this complex, a number of beam transport structures will be houses that will deliver the laser beams to the target area within a 50 {micro}m ms radius of the target center. The beam transport structures are approximately 23 m long and reach approximately heights of 2--3 stories. Low-level ambient ... continued below

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10 p.

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Swensen, E.A.; Farrar, C.R.; Barron, A.A. & Cornwell, P. December 31, 1996.

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  • Swensen, E.A.
  • Farrar, C.R. Los Alamos National Lab., NM (United States)
  • Barron, A.A. Stanford Univ., CA (United States). Dept. of Civil Engineering
  • Cornwell, P. Rose-Hulman Inst. of Tech., Terre Haute, IN (United States). Mechanical Engineering Dept.

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Description

The National Ignition Facility is a laser fusion project that will provide an above-ground experimental capability for nuclear weapons effects simulation. This facility will achieve fusion ignition utilizing solid-state lasers as the energy driver. The facility will cover an estimated 33,400 m{sup 2} at an average height of 5--6 stories. Within this complex, a number of beam transport structures will be houses that will deliver the laser beams to the target area within a 50 {micro}m ms radius of the target center. The beam transport structures are approximately 23 m long and reach approximately heights of 2--3 stories. Low-level ambient random vibrations are one of the primary concerns currently controlling the design of these structures. Low level ambient vibrations, 10{sup {minus}10} g{sup 2}/Hz over a frequency range of 1 to 200 Hz, are assumed to be present during all facility operations. Each structure described in this paper will be required to achieve and maintain 0.6 {micro}rad ms laser beam pointing stability for a minimum of 2 hours under these vibration levels. To date, finite element (FE) analysis has been performed on a number of the beam transport structures. Certain assumptions have to be made regarding structural uncertainties in the FE models. These uncertainties consist of damping values for concrete and steel, compliance within bolted and welded joints, and assumptions regarding the phase coherence of ground motion components. In this paper, the influence of these structural uncertainties on the predicted pointing stability of the beam line transport structures as determined by random vibration analysis will be discussed.

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10 p.

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INIS; OSTI as DE97001679

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  • International modal analysis conference, Orlando, FL (United States), 3-6 Feb 1997

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  • Other: DE97001679
  • Report No.: LA-UR--96-3691
  • Report No.: CONF-970233--4
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 432965
  • Archival Resource Key: ark:/67531/metadc684510

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  • December 31, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • March 1, 2016, 6:27 p.m.

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Swensen, E.A.; Farrar, C.R.; Barron, A.A. & Cornwell, P. Random vibration sensitivity studies of modeling uncertainties in the NIF structures, article, December 31, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc684510/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.