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Title: Laser induced fluorescence measurements of ion velocity and temperature of drift turbulence driven sheared plasma flow in a linear helicon plasma device

Abstract

Using laser induced fluorescence (LIF), radial profiles of azimuthal ion fluid velocity and ion temperature are measured in the controlled shear de-correlation experiment (CSDX) linear helicon plasma device. Ion velocities and temperatures are derived from the measured Doppler broadened velocity distribution functions of argon ions. The LIF system employs a portable, high power (>300 mW), narrowband ({approx}1 MHz) tunable diode laser-based system operating at 668.614 nm. Previous studies in CSDX have shown the existence of a radially sheared azimuthal flow as measured with time delay estimation methods and Mach probes. Here, we report the first LIF measurements of sheared plasma fluid flow in CSDX. Above a critical magnetic field, the ion fluid flow profile evolves from radially uniform to peaked on axis with a distinct reversed flow region at the boundary, indicating the development of a sheared azimuthal flow. Simultaneously, the ion temperature also evolves from a radially uniform profile to a profile with a gradient. Measurements in turbulent and coherent drift wave mode dominated plasmas are compared.

Authors:
; ; ; ;  [1]; ;  [2];  [3]
  1. Center for Momentum Transport and Flow Organization, University of California at San Diego, San Diego, California 92093 (United States)
  2. Department of Physics, West Virginia University, Morgantown, West Virginia 26506 (United States)
  3. Center for Energy Research, University of California at San Diego, San Diego, California 92093 (United States)
Publication Date:
OSTI Identifier:
22085993
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 8; Other Information: (c) 2012 American Institute of Physics; 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; ARGON IONS; DISTRIBUTION FUNCTIONS; FLUID FLOW; FLUORESCENCE; ION TEMPERATURE; LASER-PRODUCED PLASMA; MAGNETIC FIELDS; MHZ RANGE; PLASMA DRIFT; PROBES; SHEAR; TIME DELAY; TURBULENCE; VELOCITY; WAVE PROPAGATION

Citation Formats

Chakraborty Thakur, S, Fedorczak, N, Manz, P, Tynan, G R, Xu, M, Center for Energy Research, University of California at San Diego, San Diego, California 92093, McCarren, D, Scime, E E, and Lee, T. Laser induced fluorescence measurements of ion velocity and temperature of drift turbulence driven sheared plasma flow in a linear helicon plasma device. United States: N. p., 2012. Web. doi:10.1063/1.4742178.
Chakraborty Thakur, S, Fedorczak, N, Manz, P, Tynan, G R, Xu, M, Center for Energy Research, University of California at San Diego, San Diego, California 92093, McCarren, D, Scime, E E, & Lee, T. Laser induced fluorescence measurements of ion velocity and temperature of drift turbulence driven sheared plasma flow in a linear helicon plasma device. United States. doi:10.1063/1.4742178.
Chakraborty Thakur, S, Fedorczak, N, Manz, P, Tynan, G R, Xu, M, Center for Energy Research, University of California at San Diego, San Diego, California 92093, McCarren, D, Scime, E E, and Lee, T. Wed . "Laser induced fluorescence measurements of ion velocity and temperature of drift turbulence driven sheared plasma flow in a linear helicon plasma device". United States. doi:10.1063/1.4742178.
@article{osti_22085993,
title = {Laser induced fluorescence measurements of ion velocity and temperature of drift turbulence driven sheared plasma flow in a linear helicon plasma device},
author = {Chakraborty Thakur, S and Fedorczak, N and Manz, P and Tynan, G R and Xu, M and Center for Energy Research, University of California at San Diego, San Diego, California 92093 and McCarren, D and Scime, E E and Lee, T},
abstractNote = {Using laser induced fluorescence (LIF), radial profiles of azimuthal ion fluid velocity and ion temperature are measured in the controlled shear de-correlation experiment (CSDX) linear helicon plasma device. Ion velocities and temperatures are derived from the measured Doppler broadened velocity distribution functions of argon ions. The LIF system employs a portable, high power (>300 mW), narrowband ({approx}1 MHz) tunable diode laser-based system operating at 668.614 nm. Previous studies in CSDX have shown the existence of a radially sheared azimuthal flow as measured with time delay estimation methods and Mach probes. Here, we report the first LIF measurements of sheared plasma fluid flow in CSDX. Above a critical magnetic field, the ion fluid flow profile evolves from radially uniform to peaked on axis with a distinct reversed flow region at the boundary, indicating the development of a sheared azimuthal flow. Simultaneously, the ion temperature also evolves from a radially uniform profile to a profile with a gradient. Measurements in turbulent and coherent drift wave mode dominated plasmas are compared.},
doi = {10.1063/1.4742178},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 8,
volume = 19,
place = {United States},
year = {2012},
month = {8}
}