Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER

T. Eich, A. W. Leonard, R. A. Pitts, W. Fundamenski, Robert James Goldston, T. K. Gray, A. Herrmann, A. Kirk, A. Kallenbach, O. Kardaun, A. S. Kukushkin, B. Labombard, R. Maingi, M. A. Makowski, A. Scarabosio, B. Sieglin, J. Terry, A. Thornton

Research output: Contribution to journalArticle

260 Scopus citations

Abstract

A multi-machine database for the H-mode scrape-off layer power fall-off length, λq in JET, DIII-D, ASDEX Upgrade, C-Mod, NSTX and MAST has been assembled under the auspices of the International Tokamak Physics Activity. Regression inside the database finds that the most important scaling parameter is the poloidal magnetic field (or equivalently the plasma current), with λq decreasing linearly with increasing Bpol. For the conventional aspect ratio tokamaks, the regression finds , yielding λq,ITER ≅ 1 mm for the baseline inductive H-mode burning plasma scenario at Ip = 15 MA. The experimental divertor target heat flux profile data, from which λq is derived, also yield a divertor power spreading factor (S) which, together with λq, allows an integral power decay length on the target to be estimated. There are no differences in the λq scaling obtained from all-metal or carbon dominated machines and the inclusion of spherical tokamaks has no significant influence on the regression parameters. Comparison of the measured λq with the values expected from a recently published heuristic drift based model shows satisfactory agreement for all tokamaks.

Original languageEnglish (US)
Article number093031
JournalNuclear Fusion
Volume53
Issue number9
DOIs
StatePublished - Sep 1 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER'. Together they form a unique fingerprint.

  • Cite this

    Eich, T., Leonard, A. W., Pitts, R. A., Fundamenski, W., Goldston, R. J., Gray, T. K., Herrmann, A., Kirk, A., Kallenbach, A., Kardaun, O., Kukushkin, A. S., Labombard, B., Maingi, R., Makowski, M. A., Scarabosio, A., Sieglin, B., Terry, J., & Thornton, A. (2013). Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER. Nuclear Fusion, 53(9), [093031]. https://doi.org/10.1088/0029-5515/53/9/093031