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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)