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

Hess, Mark Harry; Hutsel, Brian Thomas; Jennings, Christopher Ashley; VanDevender, J. Pace; Sefkow, Adam B.; Gomez, Matthew R.; Knapp, Patrick F.; Laity, George Russell; Dolan, D. H.; Lamppa, Derek C.; Peterson, Kyle J.; Stygar, William A.; Sinars, Daniel B.

doi:10.1063/1.4975021

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

Journal Article · Sun Jan 29 23:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4975021· OSTI ID:1343627

Hess, Mark Harry ^[1]; ^[1]; Jennings, Christopher Ashley ^[1]; VanDevender, J. Pace ^[1]; Sefkow, Adam B. ^[2]; Gomez, Matthew R. ^[1]; ^[1]; Laity, George Russell ^[1]; Dolan, D. H. ^[1]; Lamppa, Derek C. ^[1]; Peterson, Kyle J. ^[1]; Stygar, William A. ^[1]; Sinars, Daniel B. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Rochester, Rochester, NY (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1343627

Report Number(s):: SAND--2017-1201J; 650986

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 24; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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