Optimization of the alignment sensitivity and energy stability of the NIF regenerative amplifier cavity/011

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The work to improve the energy stability of the regenerative amplifier (`regen`) for the National Ignition Facility is described. This includes a fast feed-forward system, designed to regulate the output energy of the regen by monitoring how quickly a pulse builds up over many round trips. Shot-to-shot energy fluctuations of all elements prior to (and including) the regen may be compensated for in this way, at the expense of a loss of approximately 50%. Also included is a detailed study into the alignment sensitivity of the regen cavity, with the goal of quantifying the effect of misalignment on the output ... continued below

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9 p.

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Hopps, N. W., Atomic Weapons Research Establishment, Aldermaston, Great Britain June 24, 1998.

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Description

The work to improve the energy stability of the regenerative amplifier (`regen`) for the National Ignition Facility is described. This includes a fast feed-forward system, designed to regulate the output energy of the regen by monitoring how quickly a pulse builds up over many round trips. Shot-to-shot energy fluctuations of all elements prior to (and including) the regen may be compensated for in this way, at the expense of a loss of approximately 50%. Also included is a detailed study into the alignment sensitivity of the regen cavity, with the goal of quantifying the effect of misalignment on the output energy. This is done by calculating the displacement of the eigenmode by augmenting the cavity ABCD matrix with the misalignment matrix elements, E, F. In this way, cavity misalignment issues due to thermal loading of the gain medium are investigated. Alternative cavity designs, which reduce the alignment sensitivity and therefore the energy drift over periods of continuous operation, are considered. Alterations to the amplifier head design are also considered.

Physical Description

9 p.

Notes

INIS; OSTI as DE98058701

Other: FDE: PDF; PL:

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  • 3. international conference on the solid state lasers for application to inertial confinement fusion, Monterey, CA (United States), 7-12 Jun 1998

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  • Other: DE98058701
  • Report No.: UCRL-JC--130961
  • Report No.: CONF-980653--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 658924
  • Archival Resource Key: ark:/67531/metadc702395

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 24, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 6:20 p.m.

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Hopps, N. W., Atomic Weapons Research Establishment, Aldermaston, Great Britain. Optimization of the alignment sensitivity and energy stability of the NIF regenerative amplifier cavity/011, article, June 24, 1998; California. (digital.library.unt.edu/ark:/67531/metadc702395/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.