<sup>Direct Measurements of Laser Absorption in Underdense Plasmas on OMEGA</sup>
ORAL
Abstract
A new diagnostic capability on OMEGA measures laser absorption in underdense plasmas. The fraction of laser energy deposited in the plasma by a single interaction beam is determined by simultaneously sampling the input and transmitted energy of the 61st beam at port P9. A transmitted-beam diagnostic located in the port opposing the P9 beam measures the residual energy after propagation through the plasma. Tuning the parameters and timing of the OMEGA drive beams relative to the P9 beam enables the study of absorption under a variety of plasma conditions. Initial experiments have demonstrated the ability to measure absorption ranging from 1% to 10% with accuracies of +/-0.2%. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.
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Presenters
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Joe D Katz
Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, University of Rochester
Authors
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Joe D Katz
Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, University of Rochester
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David Turnbull
University of Rochester, Laboratory for Laser Energetics, University of Rochester
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Avram Milder
Lab for Laser Energetics
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Steven T Ivancic
Laboratory for Laser Energetics, University of Rochester, University of Rochester, Lab for Laser Energetics
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Dustin H Froula
University of Rochester, Laboratory for Laser Energetics, U. of Rochester, Lab for Laser Energetics, Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester