Inter-ELM power decay length for JET and ASDEX Upgrade: Measurement and comparison with heuristic drift-based model

T. Eich, B. Sieglin, A. Scarabosio, W. Fundamenski, Robert James Goldston, A. Herrmann

Research output: Contribution to journalArticle

289 Scopus citations

Abstract

Experimental measurements of the SOL power decay length (λq) estimated from analysis of fully attached divertor heat load profiles from two tokamaks, JET and ASDEX Upgrade, are presented. Data was measured by means of infrared thermography. An empirical scaling reveals parametric dependency λq in mm=0.73BT-0.78qcyl1.2PSOL0.1Rgeo0, where BT(T) describes the toroidal magnetic field, qcyl the cylindrical safety factor, PSOL(MW) the power crossing the separatrix and Rgeo(m) the major radius of the device. A comparison of these measurements to a heuristic particle drift-based model shows satisfactory agreement in both absolute magnitude and scaling. Extrapolation to ITER gives λq1mm.

Original languageEnglish (US)
Article number215001
JournalPhysical review letters
Volume107
Issue number21
DOIs
StatePublished - Nov 14 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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