Bulk Ion Heating with ICRH on the ITER Path to Ignition

摘要

1. As a by-product of the calculations we note that the central power deposition (fig 1), compared with a flat profile, as in fig 2.6-3 in DDR for NBI, enhances the H-factor by～10% for the same x_0 Such a flat profile with little bulk ion heating givesa G value ～8.3 compared with Q = 11.7 for our case with combined heating. 2. The fraction of the additional heating power deposited on the bulk ions is close to 40% with combined heating in driven-burn operation 3. Optimisation of the ICRF parameters to maximise the power to the bulk ions and selecting appropriate density and power waveforms can bring the path to ignition close to the line of 70% ion heating fraction for 50MW of ICRF power. 4. The power required for the direct route is ～10% higher than for the KWG-type path but the T_(eo) swing to values exceeding T_(eo) during burn is avoided.