May 8-10

Abstract Details

files Add files

Abstracts

Author: Jack D. Gabriel
Requested Type: Poster
Submitted: 2023-03-31 10:28:38

Co-authors: S. Mordijck, B. Dudson, K. Loring, P. Gopinath

Contact Info:
William & Mary
614 York Street Apt. 105
Williamsburg, VA   23185
USA

Abstract Text:
Numerical investigation into the effect of temperature gradients on drift wave turbulence

J. Gabriel1, S. Mordijck1, B. Dudson2, K. Loring3, P. Gopinath1
1William & Mary, Williamsburg, VA, USA, 2Lawrence Livermore National Laboratory, Lawrence, CA, USA, 3Stanford University, Stanford, CA, USA

The results of numerical simulations using Hermes-3 (https://github.com/bendudson/hermes-3), a three-dimensional drift reduced fluid model built on the BOUT++ framework, on the effects of a temperature gradient on drift wave turbulence (DWT) in a linear device are presented. DWT is a universal instability that is primarily responsible for cross-field transport of heat and particles in magnetic confinement devices [1, 2]. Linear theory predicts that the ratio of normalized electron temperature gradient to normalized electron density gradient (η) determines if the temperature gradient stabilizes (η < 2/3) or destabilizes (η > 2/3) drift waves [3, 4]. Recent experimental work on LAPD found agreement with this for η < 2/3 [5]. In this work, the effect of temperature gradients over a range of η is presented showing general agreement with linear theory; however, differences are present. Possible nonlinear effects that cause these deviations are discussed. Additionally, it is shown the imposition of a temperature gradient can lead to a phase shift between the density and potential fluctuations as seen in recent experiments [5]. The effect of η on this phase shift is explored.

Acknowledgments
Work supported by US DOE under DE-SC0007880, US NSF under NSF PHY 2144099 and in part under the auspices of the US DOE by LLNL under Contract DE-AC52-07NA27344.

References
[1] Carter et al. Physics of Plasmas 13,1(2006), 010701
[2] Tynan et al. Plasma Physics and Controlled Fusion 51,11(2009), 113001
[3] Horton et al. Physics of Plasmas 11,5(2004), 2600-2606
[4] Goldston Introduction to Plasma Physics (2020)
[5] Perks et al. Journal of Plasma Physics 88,4(2022), 905880405

Comments: