High Confinement Mode and Edge Localized Mode Characteristics in a Near-Unity Aspect Ratio Tokamak

K. E. Thome, M. W. Bongard, J. L. Barr, G. M. Bodner, M. G. Burke, R. J. Fonck, D. M. Kriete, J. M. Perry, and D. J. Schlossberg
Phys. Rev. Lett. 116, 175001 – Published 27 April 2016

Abstract

Tokamak experiments at near-unity aspect ratio A1.2 offer new insights into the self-organized H-mode plasma confinement regime. In contrast to conventional A3 plasmas, the LH 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. 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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 16 April 2014

DOI:https://doi.org/10.1103/PhysRevLett.116.175001

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Plasma Physics

Authors & Affiliations

K. E. Thome*, M. W. Bongard, J. L. Barr, G. M. Bodner, M. G. Burke, R. J. Fonck, D. M. Kriete, J. M. Perry, and D. J. Schlossberg

  • Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA

  • *Corresponding author. thomek@fusion.gat.com

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 116, Iss. 17 — 29 April 2016

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×