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Title: Electron temperature measurements inside the ablating plasma of gas-filled hohlraums at the National Ignition Facility

Abstract

The first measurement of the electron temperature (T{sub e}) inside a National Ignition Facility hohlraum is obtained using temporally resolved K-shell X-ray spectroscopy of a mid-Z tracer dot. Both isoelectronic- and interstage-line ratios are used to calculate the local T{sub e} via the collisional–radiative atomic physics code SCRAM [Hansen et al., High Energy Density Phys 3, 109 (2007)]. The trajectory of the mid-Z dot as it is ablated from the capsule surface and moves toward the laser entrance hole (LEH) is measured using side-on x-ray imaging, characterizing the plasma flow of the ablating capsule. Data show that the measured dot location is farther away from the LEH in comparison to the radiation-hydrodynamics simulation prediction using HYDRA [Marinak et al., Phys. Plasmas 3, 2070 (1996)]. To account for this discrepancy, the predicted simulation T{sub e} is evaluated at the measured dot trajectory. The peak T{sub e}, measured to be 4.2 keV ± 0.2 keV, is ∼0.5 keV hotter than the simulation prediction.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2]; ;  [3];  [4]
  1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  2. Laboratory for Laser Energetics, Rochester, New York 14623 (United States)
  3. General Atomics, San Diego, California 92121 (United States)
  4. Sandia National Laboratories, Albuquerque, New Mexico 87123 (United States)
Publication Date:
OSTI Identifier:
22600246
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; ELECTRON TEMPERATURE; ELECTRONS; ENERGY DENSITY; HYDRODYNAMIC MODEL; HYDRODYNAMICS; K SHELL; KEV RANGE 01-10; LASERS; PLASMA; S CODES; TEMPERATURE MEASUREMENT; THERMONUCLEAR IGNITION; TRAJECTORIES; US NATIONAL IGNITION FACILITY; X RADIATION; X-RAY SPECTROSCOPY

Citation Formats

Barrios, M. A., Liedahl, D. A., Schneider, M. B., Jones, O., Brown, G. V., Fournier, K. B., Moore, A. S., Ross, J. S., Landen, O., Kauffman, R. L., Nikroo, A., Kroll, J., Callahan, D. A., Hinkel, D. E., Bradley, D., Moody, J. D., Regan, S. P., Jaquez, J., Huang, H., and Hansen, S. B. Electron temperature measurements inside the ablating plasma of gas-filled hohlraums at the National Ignition Facility. United States: N. p., 2016. Web. doi:10.1063/1.4948276.
Barrios, M. A., Liedahl, D. A., Schneider, M. B., Jones, O., Brown, G. V., Fournier, K. B., Moore, A. S., Ross, J. S., Landen, O., Kauffman, R. L., Nikroo, A., Kroll, J., Callahan, D. A., Hinkel, D. E., Bradley, D., Moody, J. D., Regan, S. P., Jaquez, J., Huang, H., & Hansen, S. B. Electron temperature measurements inside the ablating plasma of gas-filled hohlraums at the National Ignition Facility. United States. doi:10.1063/1.4948276.
Barrios, M. A., Liedahl, D. A., Schneider, M. B., Jones, O., Brown, G. V., Fournier, K. B., Moore, A. S., Ross, J. S., Landen, O., Kauffman, R. L., Nikroo, A., Kroll, J., Callahan, D. A., Hinkel, D. E., Bradley, D., Moody, J. D., Regan, S. P., Jaquez, J., Huang, H., and Hansen, S. B. Sun . "Electron temperature measurements inside the ablating plasma of gas-filled hohlraums at the National Ignition Facility". United States. doi:10.1063/1.4948276.
@article{osti_22600246,
title = {Electron temperature measurements inside the ablating plasma of gas-filled hohlraums at the National Ignition Facility},
author = {Barrios, M. A. and Liedahl, D. A. and Schneider, M. B. and Jones, O. and Brown, G. V. and Fournier, K. B. and Moore, A. S. and Ross, J. S. and Landen, O. and Kauffman, R. L. and Nikroo, A. and Kroll, J. and Callahan, D. A. and Hinkel, D. E. and Bradley, D. and Moody, J. D. and Regan, S. P. and Jaquez, J. and Huang, H. and Hansen, S. B.},
abstractNote = {The first measurement of the electron temperature (T{sub e}) inside a National Ignition Facility hohlraum is obtained using temporally resolved K-shell X-ray spectroscopy of a mid-Z tracer dot. Both isoelectronic- and interstage-line ratios are used to calculate the local T{sub e} via the collisional–radiative atomic physics code SCRAM [Hansen et al., High Energy Density Phys 3, 109 (2007)]. The trajectory of the mid-Z dot as it is ablated from the capsule surface and moves toward the laser entrance hole (LEH) is measured using side-on x-ray imaging, characterizing the plasma flow of the ablating capsule. Data show that the measured dot location is farther away from the LEH in comparison to the radiation-hydrodynamics simulation prediction using HYDRA [Marinak et al., Phys. Plasmas 3, 2070 (1996)]. To account for this discrepancy, the predicted simulation T{sub e} is evaluated at the measured dot trajectory. The peak T{sub e}, measured to be 4.2 keV ± 0.2 keV, is ∼0.5 keV hotter than the simulation prediction.},
doi = {10.1063/1.4948276},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}