Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak
Abstract
For this, access conditions for full suppression of Edge Localised Modes (ELMs) by Magnetic Perturbations (MP) in low density high confinement mode (H-mode) plasmas are studied in the ASDEX Upgrade tokamak. The main empirical requirements for full ELM suppression in our experiments are: 1. The poloidal spectrum of the MP must be aligned for best plasma response from weakly stable kink-modes, which amplify the perturbation, 2. The plasma edge density must be below a critical value, 3.3 × 1019 m-3. The edge collisionality is in the range v$$*\atop{i}$$ = 0.15 - 0.42 (ions) and v$$*\atop{e}$$ = 0.15 - 0.25 (electrons). However, our data does not show that the edge collisionality is the critical parameter that governs access to ELM suppression. 3. The pedestal pressure must be kept sufficiently low to avoid destabilisation of small ELMs. This requirement implies a systematic reduction of pedestal pressure of typically 30% compared to unmitigated ELMy H-mode in otherwise similar plasmas. 4. The edge safety factor q95 lies within a certain window. Within the range probed so far, q95 = 3.5 - 4.2, one such window, q95 = 3.57-3.95 has been identified. Within the range of plasma rotation encountered so far, no apparent threshold of plasma rotation for ELM suppression is found. This includes cases with large cross field electron flow in the entire pedestal region.
- Authors:
-
[1];
[4];
[2];
[5];
- Max Planck Inst. for Plasma Physics (IPP), Garching (Germany)
- Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Max Planck Inst. for Plasma Physics (IPP), Garching (Germany); Univ. of Seville (Spain). Dept. of Atomic, Molecular and Nuclear Physics
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; European Commission (EC)
- Contributing Org.:
- The ASDEX Upgrade; MST1 Teams; EUROfusion Consortium
- OSTI Identifier:
- 1468580
- Grant/Contract Number:
- 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 9; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ASDEX Upgrade; Edge Localised Modes; ELMs; ELM suppression; RMP; Resonant Magnetic Perturbation
Citation Formats
Suttrop, W., Kirk, A., Bobkov, V., Cavedon, M., Dunne, M., McDermott, R. M., Meyer, H., Nazikian, R., Paz-Soldan, C., Ryan, D. A., Viezzer, E., and Willensdorfer, M. Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aace93.
Suttrop, W., Kirk, A., Bobkov, V., Cavedon, M., Dunne, M., McDermott, R. M., Meyer, H., Nazikian, R., Paz-Soldan, C., Ryan, D. A., Viezzer, E., & Willensdorfer, M. Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak. United States. https://doi.org/10.1088/1741-4326/aace93
Suttrop, W., Kirk, A., Bobkov, V., Cavedon, M., Dunne, M., McDermott, R. M., Meyer, H., Nazikian, R., Paz-Soldan, C., Ryan, D. A., Viezzer, E., and Willensdorfer, M. Tue .
"Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak". United States. https://doi.org/10.1088/1741-4326/aace93. https://www.osti.gov/servlets/purl/1468580.
@article{osti_1468580,
title = {Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak},
author = {Suttrop, W. and Kirk, A. and Bobkov, V. and Cavedon, M. and Dunne, M. and McDermott, R. M. and Meyer, H. and Nazikian, R. and Paz-Soldan, C. and Ryan, D. A. and Viezzer, E. and Willensdorfer, M.},
abstractNote = {For this, access conditions for full suppression of Edge Localised Modes (ELMs) by Magnetic Perturbations (MP) in low density high confinement mode (H-mode) plasmas are studied in the ASDEX Upgrade tokamak. The main empirical requirements for full ELM suppression in our experiments are: 1. The poloidal spectrum of the MP must be aligned for best plasma response from weakly stable kink-modes, which amplify the perturbation, 2. The plasma edge density must be below a critical value, 3.3 × 1019 m-3. The edge collisionality is in the range v$*\atop{i}$ = 0.15 - 0.42 (ions) and v$*\atop{e}$ = 0.15 - 0.25 (electrons). However, our data does not show that the edge collisionality is the critical parameter that governs access to ELM suppression. 3. The pedestal pressure must be kept sufficiently low to avoid destabilisation of small ELMs. This requirement implies a systematic reduction of pedestal pressure of typically 30% compared to unmitigated ELMy H-mode in otherwise similar plasmas. 4. The edge safety factor q95 lies within a certain window. Within the range probed so far, q95 = 3.5 - 4.2, one such window, q95 = 3.57-3.95 has been identified. Within the range of plasma rotation encountered so far, no apparent threshold of plasma rotation for ELM suppression is found. This includes cases with large cross field electron flow in the entire pedestal region.},
doi = {10.1088/1741-4326/aace93},
journal = {Nuclear Fusion},
number = 9,
volume = 58,
place = {United States},
year = {Tue Jul 17 00:00:00 EDT 2018},
month = {Tue Jul 17 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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