High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak
Abstract
Tokamak experiments at near-unity aspect ratio A ≲ 1.2 offer new insights into the self-organized H-mode plasma confinement regime. In contrast to conventional A ~ 3 plasmas, the L–H power threshold PLH is ~15× higher than scaling predictions, and it is insensitive to magnetic topology, consistent with modeling. Edge localized mode (ELM) instabilities shift to lower toroidal mode numbers as A decreases. Furthermore, these ultralow-A operations enable heretofore inaccessible Jedge(R,t) measurements through an ELM that show a complex multimodal collapse and the ejection of a current-carrying filament.
- Authors:
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- Univ. of Wisconsin-Madison, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1253176
- Alternate Identifier(s):
- OSTI ID: 1249936
- Grant/Contract Number:
- FG02-96ER54375
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 116; Journal Issue: 17; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Thome, Kathreen E., Bongard, Michael W., Barr, Jayson L., Bodner, Grant M., Burke, Marcus G., Fonck, Raymond J., Kriete, David M., Perry, Justin M., and Schlossberg, David J. High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak. United States: N. p., 2016.
Web. doi:10.1103/PhysRevLett.116.175001.
Thome, Kathreen E., Bongard, Michael W., Barr, Jayson L., Bodner, Grant M., Burke, Marcus G., Fonck, Raymond J., Kriete, David M., Perry, Justin M., & Schlossberg, David J. High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak. United States. https://doi.org/10.1103/PhysRevLett.116.175001
Thome, Kathreen E., Bongard, Michael W., Barr, Jayson L., Bodner, Grant M., Burke, Marcus G., Fonck, Raymond J., Kriete, David M., Perry, Justin M., and Schlossberg, David J. Wed .
"High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak". United States. https://doi.org/10.1103/PhysRevLett.116.175001. https://www.osti.gov/servlets/purl/1253176.
@article{osti_1253176,
title = {High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak},
author = {Thome, Kathreen E. and Bongard, Michael W. and Barr, Jayson L. and Bodner, Grant M. and Burke, Marcus G. and Fonck, Raymond J. and Kriete, David M. and Perry, Justin M. and Schlossberg, David J.},
abstractNote = {Tokamak experiments at near-unity aspect ratio A ≲ 1.2 offer new insights into the self-organized H-mode plasma confinement regime. In contrast to conventional A ~ 3 plasmas, the L–H power threshold PLH is ~15× higher than scaling predictions, and it is insensitive to magnetic topology, consistent with modeling. Edge localized mode (ELM) instabilities shift to lower toroidal mode numbers as A decreases. Furthermore, these ultralow-A operations enable heretofore inaccessible Jedge(R,t) measurements through an ELM that show a complex multimodal collapse and the ejection of a current-carrying filament.},
doi = {10.1103/PhysRevLett.116.175001},
journal = {Physical Review Letters},
number = 17,
volume = 116,
place = {United States},
year = {Wed Apr 27 00:00:00 EDT 2016},
month = {Wed Apr 27 00:00:00 EDT 2016}
}
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Cited by: 8 works
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Figures / Tables:
FIG. 1.: Ip (a), Dα signal (b), and ΦD (c) of H-mode (solid black line) and L-mode (dashed red line) discharges. Visible images (∆t ∼ 10μs) of limited L-mode (d) and H-mode (e) plasmas and a contrast-enhanced ELM (f).
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Public Data Set: High Confinement Mode and Edge Localized Mode Characteristics in a Near-Unity Aspect Ratio Tokamak
dataset, January 2016
- Thome, Kathreen; Bongard, Michael; Barr, Jayson
- Pegasus, 13 files
Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment
dataset, January 2016
- Thome, Kathreen; Bongard, Michael; Barr, Jayson
Public Data Set: On Virial Analysis at Low Aspect Ratio
dataset, July 2016
- Bongard, Michael; Barr, Jayson; Fonck, Raymond
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.4959808, 1 file (440 KB)
Public Data Set: A Novel, Cost-Effective, Multi-Point Thomson Scattering System on the Pegasus Toroidal Experiment
dataset, September 2016
- Schlossberg, D. J.; Bodner, G. M.; Reusch, J. A.
- AIP - Review of Scientific Instruments, Vol. 87, Issue 11, 49.6 MB
Public Data Set: Control and Automation of the Pegasus Multi-point Thomson Scattering System
dataset, January 2016
- Bodner, Grant; Bongard, Michael; Fonck, Raymond
- Pegasus, 13 files
Public Data Set: Erratum: "Multi-point, high-speed passive ion velocity distribution diagnostic on the Pegasus Toroidal Experiment" [Rev. Sci. Instrum. 83, 10D516 (2012)]
dataset, January 2016
- Burke, Marcus; Fonck, Raymond; Bongard, Michael
Public Data Set: Continuous, Edge Localized Ion Heating During Non-Solenoidal Plasma Startup and Sustainment in a Low Aspect Ratio Tokamak
dataset, January 2017
- Burke, Marcus; Barr, Jayson; Bongard, Michael
Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
dataset, May 2018
- Barr, J. L.; Bongard, M. W.; Burke, M. G.
- Pegasus Public Data Sets
Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
dataset, March 2018
- Reusch, Joshua; Bodner, Grant; Bongard, Michael
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
dataset, July 2018
- Perry, Justin; Bodner, Grant; Bongard, Michael
- Pegasus-Supplementary information for journal article at DOI: https://doi.org/10.1088/1741-4326/aac72e, 1 file (17.1 MB)
Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
dataset, July 2018
- Richner, Nathan; Bongard, Michael; Fonck, Raymond
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup
dataset, January 2019
- Bongard, Michael; Bodner, Grant; Burke, Marcus
- University of Wisconsin-Madison
Public Data Set: High Confinement Mode and Edge Localized Mode Characteristics in a Near-Unity Aspect Ratio Tokamak
dataset, January 2016
- Thome, Kathreen; Bongard, Michael; Barr, Jayson
- Pegasus, 13 files
Public Data Set: Continuous, Edge Localized Ion Heating During Non-Solenoidal Plasma Startup and Sustainment in a Low Aspect Ratio Tokamak
dataset, January 2017
- Burke, Marcus; Barr, Jayson; Bongard, Michael
Non-linear MHD simulation of ELM energy deposition
journal, November 2013
- Huijsmans, G. T. A.; Loarte, A.
- Nuclear Fusion, Vol. 53, Issue 12
Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment
dataset, January 2016
- Thome, Kathreen; Bongard, Michael; Barr, Jayson
Public Data Set: On Virial Analysis at Low Aspect Ratio
dataset, July 2016
- Bongard, Michael; Barr, Jayson; Fonck, Raymond
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.4959808, 1 file (440 KB)
Public Data Set: A Novel, Cost-Effective, Multi-Point Thomson Scattering System on the Pegasus Toroidal Experiment
dataset, September 2016
- Schlossberg, D. J.; Bodner, G. M.; Reusch, J. A.
- AIP - Review of Scientific Instruments, Vol. 87, Issue 11, 49.6 MB
Public Data Set: Control and Automation of the Pegasus Multi-point Thomson Scattering System
dataset, January 2016
- Bodner, Grant; Bongard, Michael; Fonck, Raymond
- Pegasus, 13 files
Public Data Set: Erratum: "Multi-point, high-speed passive ion velocity distribution diagnostic on the Pegasus Toroidal Experiment" [Rev. Sci. Instrum. 83, 10D516 (2012)]
dataset, January 2016
- Burke, Marcus; Fonck, Raymond; Bongard, Michael
Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
dataset, May 2018
- Barr, J. L.; Bongard, M. W.; Burke, M. G.
- Pegasus Public Data Sets
Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
dataset, March 2018
- Reusch, Joshua; Bodner, Grant; Bongard, Michael
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
dataset, July 2018
- Perry, Justin; Bodner, Grant; Bongard, Michael
- Pegasus-Supplementary information for journal article at DOI: https://doi.org/10.1088/1741-4326/aac72e, 1 file (17.1 MB)
Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
dataset, July 2018
- Richner, Nathan; Bongard, Michael; Fonck, Raymond
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup
dataset, January 2019
- Bongard, Michael; Bodner, Grant; Burke, Marcus
- University of Wisconsin-Madison
Works referencing / citing this record:
A novel, cost-effective, multi-point Thomson scattering system on the Pegasus Toroidal Experiment (invited)
journal, September 2016
- Schlossberg, D. J.; Bodner, G. M.; Bongard, M. W.
- Review of Scientific Instruments, Vol. 87, Issue 11, Article No. 11E403
Public Data Set: High Confinement Mode and Edge Localized Mode Characteristics in a Near-Unity Aspect Ratio Tokamak
dataset, January 2016
- Thome, Kathreen; Bongard, Michael; Barr, Jayson
- Pegasus, 13 files
Public Data Set: H-mode Plasmas at Very Low Aspect Ratio on the Pegasus Toroidal Experiment
dataset, January 2016
- Thome, Kathreen; Bongard, Michael; Barr, Jayson
Public Data Set: On Virial Analysis at Low Aspect Ratio
dataset, July 2016
- Bongard, Michael; Barr, Jayson; Fonck, Raymond
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.4959808, 1 file (440 KB)
Public Data Set: A Novel, Cost-Effective, Multi-Point Thomson Scattering System on the Pegasus Toroidal Experiment
dataset, September 2016
- Schlossberg, D. J.; Bodner, G. M.; Reusch, J. A.
- AIP - Review of Scientific Instruments, Vol. 87, Issue 11, 49.6 MB
Public Data Set: Control and Automation of the Pegasus Multi-point Thomson Scattering System
dataset, January 2016
- Bodner, Grant; Bongard, Michael; Fonck, Raymond
- Pegasus, 13 files
Public Data Set: Erratum: "Multi-point, high-speed passive ion velocity distribution diagnostic on the Pegasus Toroidal Experiment" [Rev. Sci. Instrum. 83, 10D516 (2012)]
dataset, January 2016
- Burke, Marcus; Fonck, Raymond; Bongard, Michael
Public Data Set: Continuous, Edge Localized Ion Heating During Non-Solenoidal Plasma Startup and Sustainment in a Low Aspect Ratio Tokamak
dataset, January 2017
- Burke, Marcus; Barr, Jayson; Bongard, Michael
Public Data Set: A Power-Balance Model for Local Helicity Injection Startup in a Spherical Tokamak
dataset, May 2018
- Barr, J. L.; Bongard, M. W.; Burke, M. G.
- Pegasus Public Data Sets
Public Data Set: Non-inductively Driven Tokamak Plasmas at Near-Unity βt in the Pegasus Toroidal Experiment
dataset, March 2018
- Reusch, Joshua; Bodner, Grant; Bongard, Michael
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5017966, 1 file (5.1 MB)
Public Data Set: Initiation and Sustainment of Tokamak Plasmas with Local Helicity Injection as the Majority Current Drive
dataset, July 2018
- Perry, Justin; Bodner, Grant; Bongard, Michael
- Pegasus-Supplementary information for journal article at DOI: https://doi.org/10.1088/1741-4326/aac72e, 1 file (17.1 MB)
Public Data Set: Radially Scanning Magnetic Probes to Study Local Helicity Injection Dynamics
dataset, July 2018
- Richner, Nathan; Bongard, Michael; Fonck, Raymond
- Pegasus-Supplementary information for journal article at DOI: 10.1063/1.5036527, 1 file (9.4 MB)
Public Data Set: Spatial Heterodyne Spectroscopy for High Speed Measurements of Stark Split Neutral Beam Emission in a High Temperature Plasma
dataset, January 2018
- Burke, Marcus; Fonck, Raymond; McKee, George
- University of Wisconsin-Madison
Public Data Set: Advancing Local Helicity Injection for Non-Solenoidal Tokamak Startup
dataset, January 2019
- Bongard, Michael; Bodner, Grant; Burke, Marcus
- University of Wisconsin-Madison
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.