Abstract
Velocity anisotropy of the suprathermal population created by heating (essentially ion cyclotron resonant heating (ICRH)) is known to influence sawtooth stabilization in tokamaks. However, studying such effects requires a realistic description of the hot ion distribution pitch angle dependence in terms of easily accessible experimental data. Such a description has been obtained for on-axis ICRH on Tore Supra. A simple analytic model, allowing an easy analysis of experimental data, is developed and applied to the above mentioned description of on-axis ICRH. It leads to the result that, contrary to common presumption, sawtooth stabilization with on-axis ICRH is driven by both passing and trapped hot ions. In Tore Supra discharges, the stabilizing effect of barely passing hot ions is found to be dominant
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