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2 results for “drift-wave”
Plasma density turbulence obtained from a Hasegawa-Wakatani drift-wave turbulence model within the BOUT++ framework
<p>A Hasegawa-Wakatani drift-wave turbulence model [1] within the BOUT++ framework [2] was used to generate a set of turbulent plasma density profiles. Drift-wave turbulence is thought to be the dominant mechanism responsible for the anomalous transport observed in the edge of tokamak plasmas.</p> <p>The motivation to generate this rather large set of density profiles was to properly study the influence of plasma density fluctuations on traversing microwaves which requires ensemble-averaging to get statistically relevant results.</p> <p>The density data is given in normalized units (1.0 would correspond to 100 % fluctuation degree) on a mean-free background and the spatial coordinates are given in units of the ion Larmor radius.</p> <p>The form of equations used was the un-modified Hasegawa-Wakatani model [3]. Input parameters were kappa = 1.0 (normalised background density gradient), alpha = 0.5 (adiabaticity parameter), and diffusion constant D=1e-2.</p> <ol> <li>Wakatani, M., Hasegawa, A. (1984). <em>A collisional drift wave description of plasma edge turbulence.</em> Phys. Fluids <strong>27</strong>(3), 611. doi:10.1063/1.864660</li> <li>Dudson, B. <em>et al.</em> (2009). <em>BOUT++: A framework for parallel plasma fluid simulations</em>. Comp. Phys. Comm. <strong>180</strong>(9), 1467. doi:10.1016/j.cpc.2009.03.008</li> <li>Numata, R., Ball, R., & Dewar, R. L. (2007). <em>Bifurcation in electrostatic resistive drift wave turbulence</em>. Phys. Plasmas <strong>14</strong>(10), 102312. doi:10.1063/1.2796106</li> </ol>
Dataset from: Impact of the electron density and temperature gradient on drift-wave turbulence in LAPD
<p>In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power to show experimentally that turbulent density fluctuations decrease with decreasing density gradient, as predicted for resistive drift wave turbulence. We also observe that the introduction of electron temperature gradients leads to a reduction in the amplitude of the density fluctuations. The electron temperature gradient reduces the low frequency fluctuations up to 10 kHz, while at higher frequencies, a π phase shift in the density-potential cross-phase is observed. We find that the potential fluctuations do not follow the same trends and that the basic Boltzmann relationship between potential and density fluctuations is violated. We also discuss the impact of collisionality and parallel flows.</p>
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