The effects of main-ion dilution on turbulence in low q[subscript 95] C-Mod ohmic plasmas, and comparisons with nonlinear GYRO
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Author(s)
Candy, J.
Staebler, G.
Reinke, M. L
Ennever, Paul Chappell
Porkolab, Miklos
Rice, John E
Rost, Jon C
Ernst, Darin R
Hughes Jr, Jerry
Baek, Seung Gyou
Alternative Title
The effects of main-ion dilution on turbulence in low q95 C-Mod ohmic plasmas, and comparisons with nonlinear GYRO
Date Issued
August 2016
Journal
Physics of Plasmas
Publisher
American Institute of Physics (AIP)
Citation
Ennever, P. et al. “The Effects of Main-Ion Dilution on Turbulence in Low Q 95 C-Mod Ohmic Plasmas, and Comparisons with Nonlinear GYRO.” Physics of Plasmas 23.8 (2016): 082509.
Version
Original manuscript
Abstract
Recent experiments on C-mod seeding nitrogen into ohmic plasmas with [subscript q]95 = 3.4 found that the seeding greatly reduced long-wavelength (ITG-scale) turbulence. The long-wavelength turbulence that was reduced by the nitrogen seeding was localized to the region of r/a≈0.85, where the turbulence is well above marginal stability (as evidenced by Q[subscript i]/Q[subscript GB]≫1). The nonlinear gyrokinetic code GYRO was used to simulate the expected turbulence in these plasmas, and the simulated turbulent density fluctuations and turbulent energy fluxes quantitatively agreed with the experimental measurements both before and after the nitrogen seeding. Unexpectedly, the intrinsic rotation of the plasma was also found to be affected by the nitrogen seeding, in a manner apparently unrelated to a change in the electron-ion collisionality that was proposed by other experiments.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1063/1.4960315
