skip to main content

DOE PAGESDOE PAGES

Title: High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak

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 P LH 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 J edge(R,t) measurements through an ELM that show a complex multimodal collapse and the ejection of a current-carrying filament.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)
Publication Date:
Grant/Contract Number:
FG02-96ER54375
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)
Research Org:
Univ. of Wisconsin-Madison, Madison, WI (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1253176
Alternate Identifier(s):
OSTI ID: 1249936

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., 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. 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., and Schlossberg, David J.. 2016. "High confinement mode and edge localized mode characteristics in a near-unity aspect ratio tokamak". United States. doi: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 = {2016},
month = {4}
}