Investigating flow patterns and related dynamics in multiinstability turbulent plasmas using a threepoint crossphase time delay estimation velocimetry scheme
Here, complexities of flow patterns in the azimuthal crosssection of a cylindrical magnetized helicon plasma and the corresponding plasma dynamics are investigated by means of a novel scheme for time delay estimation velocimetry. The advantage of this introduced method is the capability of calculating the timeaveraged 2D velocity fields of propagating wavelike structures and patterns in complex spatiotemporal data. It is able to distinguish and visualize the details of simultaneously present superimposed entangled dynamics and it can be applied to fluidlike systems exhibiting frequently repeating patterns (e.g., waves in plasmas, waves in fluids, dynamics in planetary atmospheres, etc.). The velocity calculations are based on time delay estimation obtained from crossphase analysis of time series. Each velocity vector is unambiguously calculated from three time series measured at three different noncollinear spatial points. This method, when applied to fast imaging, has been crucial to understand the rich plasma dynamics in the azimuthal crosssection of a cylindrical linear magnetized helicon plasma. The capabilities and the limitations of this velocimetry method are discussed and demonstrated for two completely different plasma regimes, i.e., for quasicoherent wave dynamics and for complex broadband wave dynamics involving simultaneously present multiple instabilities.
 Authors:

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 Univ. of California, San Diego, CA (United States). Center for Energy Research; Max Planck Inst. for Plasma Physics (IPP), Greifswald (Germany)
 Univ. of California, San Diego, CA (United States). Center for Energy Research; Center for Momentum Transport and Flow Organization (CMTFO), La Jolla, CA (United States)
 Publication Date:
 Grant/Contract Number:
 SC0008378; FG0207ER54912
 Type:
 Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 23; Journal Issue: 4; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Research Org:
 Univ. of California, San Diego, CA (United States)
 Sponsoring Org:
 USDOE Office of Science (SC)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
 OSTI Identifier:
 1470307
Brandt, C., Thakur, S. C., and Tynan, G. R.. Investigating flow patterns and related dynamics in multiinstability turbulent plasmas using a threepoint crossphase time delay estimation velocimetry scheme. United States: N. p.,
Web. doi:10.1063/1.4945629.
Brandt, C., Thakur, S. C., & Tynan, G. R.. Investigating flow patterns and related dynamics in multiinstability turbulent plasmas using a threepoint crossphase time delay estimation velocimetry scheme. United States. doi:10.1063/1.4945629.
Brandt, C., Thakur, S. C., and Tynan, G. R.. 2016.
"Investigating flow patterns and related dynamics in multiinstability turbulent plasmas using a threepoint crossphase time delay estimation velocimetry scheme". United States.
doi:10.1063/1.4945629. https://www.osti.gov/servlets/purl/1470307.
@article{osti_1470307,
title = {Investigating flow patterns and related dynamics in multiinstability turbulent plasmas using a threepoint crossphase time delay estimation velocimetry scheme},
author = {Brandt, C. and Thakur, S. C. and Tynan, G. R.},
abstractNote = {Here, complexities of flow patterns in the azimuthal crosssection of a cylindrical magnetized helicon plasma and the corresponding plasma dynamics are investigated by means of a novel scheme for time delay estimation velocimetry. The advantage of this introduced method is the capability of calculating the timeaveraged 2D velocity fields of propagating wavelike structures and patterns in complex spatiotemporal data. It is able to distinguish and visualize the details of simultaneously present superimposed entangled dynamics and it can be applied to fluidlike systems exhibiting frequently repeating patterns (e.g., waves in plasmas, waves in fluids, dynamics in planetary atmospheres, etc.). The velocity calculations are based on time delay estimation obtained from crossphase analysis of time series. Each velocity vector is unambiguously calculated from three time series measured at three different noncollinear spatial points. This method, when applied to fast imaging, has been crucial to understand the rich plasma dynamics in the azimuthal crosssection of a cylindrical linear magnetized helicon plasma. The capabilities and the limitations of this velocimetry method are discussed and demonstrated for two completely different plasma regimes, i.e., for quasicoherent wave dynamics and for complex broadband wave dynamics involving simultaneously present multiple instabilities.},
doi = {10.1063/1.4945629},
journal = {Physics of Plasmas},
number = 4,
volume = 23,
place = {United States},
year = {2016},
month = {4}
}