Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session NO03: High Field Tokamaks: SPARC, C-Mod, and Others
9:30 AM–12:42 PM,
Wednesday, October 19, 2022
Room: Ballroom 100 C
Chair: Ian Hutchinson, Massachusetts Institute of Technology MI
Abstract: NO03.00013 : Filament structures and average radial scrape-off layer profiles in Alcator C-Mod*
11:54 AM–12:06 PM
Presenter:
Gregor Decristoforo
(UiT The Arctic University of Norway)
Authors:
Gregor Decristoforo
(UiT The Arctic University of Norway)
Woonghee Han
(Massachusetts Institute of Technology MI)
James L Terry
(Massachusetts Institute of Technology MI)
Odd Erik Garcia
(UiT The Arctic University of Norway)
In this contribution, gas puff imaging (GPI) data from Alcator C-Mod are analysed. The two-dimensional measurements are recorded utilizing a fast-framing camera with a frame rate of 396 kHz and high pixel density (64×64). Plasma filaments are identified and tracked over time utilizing Recurrent All-Pairs Field Transforms (RAFT), a deep neural network architecture developed for studying optical flow [4; 5].
The average SOL profiles are inferred from the measured distributions of filament parameters via a stochastic model, describing SOL profiles and fluctuations as a super-position of uncorrelated structures [6]. It is investigated how the filament parameters depend on experimental control parameters such as line-averaged density, plasma current and heating power. The work will aid in developing predictive capabilities for SOL profiles of future experiments such as SPARC.
References
[1] N. R. Walkden, et al., Plasma Phys. Contr. Fusion, 59.8, 085009, (2017).
[2] F. Militello, et al., Nucl. Fusion, 56.10, 104004, (2016).
[3] O. E. Garcia, Phys. Rev., 108.26, 265001, (2012).
[4] Z. Teed, et al., Europ. conf. on computer vision, 402-419 (2020)
[5] W. Han, et al. arXiv preprint, 2111.08570 (2021).
[6] O. E. Garcia, et al., Phys. Plasmas, 23.5, 052308, (2016).
*G. D. thanks MIT Plasma Science and Fusion Center for their generous hospitality where this work was conducted. This work was supported in part by Equinor Energy and US Department of Energy, Fusion Energy Sciences, awards DE-SC0014251, DE-SC0014264, and DE-SC0020327.
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