This content will become publicly available on Sat Jun 08 00:00:00 EDT 2024
Understanding the negative triangularity ELM trigger and ELM free state on DIII-D with ECE-imaging
Abstract
The Electron Cyclotron Emission Imaging (ECEI) diagnostic was used to observe a finite-n interchange mode structure in the edge of negative triangularity shaped plasmas on DIII-D. At a small negative triangularity (δu = −0.2), the plasma is in the H-mode with ELMs that are triggered by a low-n interchange mode. At a larger negative triangularity (δu = −0.4) and low NBI power (2 MW), a dithering oscillation is observed that is triggered by a low-n interchange mode, whereas at higher NBI power (>2 MW), the edge reverts to L-mode and the low-n interchange mode is present continuously. In all cases, the edge pressure gradient is clamped when the interchange mode is present. It is concluded that the low-n interchange mode prevents the plasma from transitioning to H-mode at a large negative triangularity. This agrees with linear BOUT++ simulations which suggest that the interchange-type MHD can be a resistive ballooning mode whereby resistivity can significantly increase the finite-n ballooning mode growth rate. The absence of H-mode at large negative triangularity can, thus, be explained by the excitation of low-n pressure driven resistive ballooning modes in the plasma edge.
- Authors:
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[1];
[2];
[3];
[5];
[2];
[4];
[6];
[7];
[1];
[1];
[1];
[1]
- Univ. of California, Davis, CA (United States)
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Columbia Univ., New York, NY (United States)
- Univ. of Texas, Austin, TX (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1995170
- Alternate Identifier(s):
- OSTI ID: 2282408
- Report Number(s):
- LLNL-JRNL-857629
Journal ID: ISSN 1070-664X; TRN: US2405035
- Grant/Contract Number:
- FC02-04ER54698; FG02-99ER54531; AC02-09CH11466; FG02-08ER54999; SC0022270; FG02-97ER54415; AC52-07NA27344; AC02-05CH11231; FES-ERCAP0020598
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Signal processing; Magnetohydrodynamics; Plasma confinement; Plasma instabilities; Plasma waves; Tokamaks
Citation Formats
Yu, Guanying, Li, Zeyu, Kramer, Gerrit, Scotti, F., Nelson, Andrew O., Diallo, Ahmed, Lasnier, Charles, Austin, Max E., Qin, Xijie, Chen, Ying, Zheng, Yuan, Zhu, Yilun, and Luhmann, Jr., Neville C. Understanding the negative triangularity ELM trigger and ELM free state on DIII-D with ECE-imaging. United States: N. p., 2023.
Web. doi:10.1063/5.0144711.
Yu, Guanying, Li, Zeyu, Kramer, Gerrit, Scotti, F., Nelson, Andrew O., Diallo, Ahmed, Lasnier, Charles, Austin, Max E., Qin, Xijie, Chen, Ying, Zheng, Yuan, Zhu, Yilun, & Luhmann, Jr., Neville C. Understanding the negative triangularity ELM trigger and ELM free state on DIII-D with ECE-imaging. United States. https://doi.org/10.1063/5.0144711
Yu, Guanying, Li, Zeyu, Kramer, Gerrit, Scotti, F., Nelson, Andrew O., Diallo, Ahmed, Lasnier, Charles, Austin, Max E., Qin, Xijie, Chen, Ying, Zheng, Yuan, Zhu, Yilun, and Luhmann, Jr., Neville C. Thu .
"Understanding the negative triangularity ELM trigger and ELM free state on DIII-D with ECE-imaging". United States. https://doi.org/10.1063/5.0144711.
@article{osti_1995170,
title = {Understanding the negative triangularity ELM trigger and ELM free state on DIII-D with ECE-imaging},
author = {Yu, Guanying and Li, Zeyu and Kramer, Gerrit and Scotti, F. and Nelson, Andrew O. and Diallo, Ahmed and Lasnier, Charles and Austin, Max E. and Qin, Xijie and Chen, Ying and Zheng, Yuan and Zhu, Yilun and Luhmann, Jr., Neville C.},
abstractNote = {The Electron Cyclotron Emission Imaging (ECEI) diagnostic was used to observe a finite-n interchange mode structure in the edge of negative triangularity shaped plasmas on DIII-D. At a small negative triangularity (δu = −0.2), the plasma is in the H-mode with ELMs that are triggered by a low-n interchange mode. At a larger negative triangularity (δu = −0.4) and low NBI power (2 MW), a dithering oscillation is observed that is triggered by a low-n interchange mode, whereas at higher NBI power (>2 MW), the edge reverts to L-mode and the low-n interchange mode is present continuously. In all cases, the edge pressure gradient is clamped when the interchange mode is present. It is concluded that the low-n interchange mode prevents the plasma from transitioning to H-mode at a large negative triangularity. This agrees with linear BOUT++ simulations which suggest that the interchange-type MHD can be a resistive ballooning mode whereby resistivity can significantly increase the finite-n ballooning mode growth rate. The absence of H-mode at large negative triangularity can, thus, be explained by the excitation of low-n pressure driven resistive ballooning modes in the plasma edge.},
doi = {10.1063/5.0144711},
journal = {Physics of Plasmas},
number = 6,
volume = 30,
place = {United States},
year = {Thu Jun 08 00:00:00 EDT 2023},
month = {Thu Jun 08 00:00:00 EDT 2023}
}
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