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Title: Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic

Abstract

Recent Magnetized Liner Inertial Fusion experiments at the Sandia National Laboratories Z pulsed power facility have featured a PDV (Photonic Doppler Velocimetry) diagnostic in the final power feed section for measuring load current. In this paper, we report on an anomalous pressure that is detected on this PDV diagnostic very early in time during the current ramp. Early time load currents that are greater than both B-dot upstream current measurements and existing Z machine circuit models by at least 1 MA would be necessary to describe the measured early time velocity of the PDV flyer. This leads us to infer that the pressure producing the early time PDV flyer motion cannot be attributed to the magnetic pressure of the load current but rather to an anomalous pressure. Using the MHD code ALEGRA, we are able to compute a time-dependent anomalous pressure function, which when added to the magnetic pressure of the load current, yields simulated flyer velocities that are in excellent agreement with the PDV measurement. As a result, we also provide plausible explanations for what could be the origin of the anomalous pressure.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1399886
Alternate Identifier(s):
OSTI ID: 1343627
Report Number(s):
SAND2016-11409J; SAND-2017-1201J
Journal ID: ISSN 1070-664X; PHPAEN; 649042; TRN: US1703091
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Hess, M. H., Hutsel, B. T., Jennings, C. A., VanDevender, J. P., Sefkow, A. B., Gomez, M. R., Knapp, P. F., Laity, G. R., Dolan, D. H., Lamppa, D. C., Peterson, K. J., Stygar, W. A., and Sinars, D. B. Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic. United States: N. p., 2017. Web. doi:10.1063/1.4975021.
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Hess, M. H., Hutsel, B. T., Jennings, C. A., VanDevender, J. P., Sefkow, A. B., Gomez, M. R., Knapp, P. F., Laity, G. R., Dolan, D. H., Lamppa, D. C., Peterson, K. J., Stygar, W. A., & Sinars, D. B. Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic. United States. https://doi.org/10.1063/1.4975021
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Hess, M. H., Hutsel, B. T., Jennings, C. A., VanDevender, J. P., Sefkow, A. B., Gomez, M. R., Knapp, P. F., Laity, G. R., Dolan, D. H., Lamppa, D. C., Peterson, K. J., Stygar, W. A., and Sinars, D. B. Mon . "Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic". United States. https://doi.org/10.1063/1.4975021. https://www.osti.gov/servlets/purl/1399886.
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@article{osti_1399886,
title = {Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic},
author = {Hess, M. H. and Hutsel, B. T. and Jennings, C. A. and VanDevender, J. P. and Sefkow, A. B. and Gomez, M. R. and Knapp, P. F. and Laity, G. R. and Dolan, D. H. and Lamppa, D. C. and Peterson, K. J. and Stygar, W. A. and Sinars, D. B.},
abstractNote = {Recent Magnetized Liner Inertial Fusion experiments at the Sandia National Laboratories Z pulsed power facility have featured a PDV (Photonic Doppler Velocimetry) diagnostic in the final power feed section for measuring load current. In this paper, we report on an anomalous pressure that is detected on this PDV diagnostic very early in time during the current ramp. Early time load currents that are greater than both B-dot upstream current measurements and existing Z machine circuit models by at least 1 MA would be necessary to describe the measured early time velocity of the PDV flyer. This leads us to infer that the pressure producing the early time PDV flyer motion cannot be attributed to the magnetic pressure of the load current but rather to an anomalous pressure. Using the MHD code ALEGRA, we are able to compute a time-dependent anomalous pressure function, which when added to the magnetic pressure of the load current, yields simulated flyer velocities that are in excellent agreement with the PDV measurement. As a result, we also provide plausible explanations for what could be the origin of the anomalous pressure.},
doi = {10.1063/1.4975021},
journal = {Physics of Plasmas},
number = 1,
volume = 24,
place = {United States},
year = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}
}
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https://doi.org/10.1063/1.4975021
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    Works referencing / citing this record:

    Design and testing of a magnetically driven implosion peak current diagnostic
    journal, April 2018

    • Hess, M. H.; Peterson, K. J.; Ampleford, D. J.
    • Physics of Plasmas, Vol. 25, Issue 4
    • DOI: 10.1063/1.5024374

    Implosion of auto-magnetizing helical liners on the Z facility
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    • Shipley, G. A.; Awe, T. J.; Hutsel, B. T.
    • Physics of Plasmas, Vol. 26, Issue 5
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