Scaling of extended-tail temperature for combined NBI and ICRF heating
- 1 July 1988
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 30 (8) , 943-955
- https://doi.org/10.1088/0741-3335/30/8/003
Abstract
Acceleration of the beam-induced tail ions by second harmonic ICRF waves is analytically investigated. The pitch-angle-averaged distribution function of ions is obtained by use of a local Fokker-Planck equation with the beam source and quasi-linear r.f. diffusion terms. The beam-induced tail is extended to the energy region above the injection energy by r.f.-induced diffusion. A simple scaling of the 'extended-tail temperature' with respect to the deposited r.f. power density is presented. Comparison is made with numerical results by a two-dimensional Fokker-Planck code. It is found that the analytical results are in good agreement with the numerical results for the beam injection nearly-perpendicular to the magnetic field. The scaling is also consistent with the data of combined heating experiments in JT-60.Keywords
This publication has 7 references indexed in Scilit:
- Effective ion tail formation by beam and ion cyclotron heatingNuclear Fusion, 1987
- Anisotropic analysis of ion distributions distorted by ICRH in a tokamak plasmaPlasma Physics and Controlled Fusion, 1987
- Coupling theory for ICRF heating of large tokamaksNuclear Fusion, 1984
- A 2-D Fokker-Planck treatment of the ICRF enhancement of beam-driven currentsNuclear Fusion, 1984
- Enhancement of high-energy ion tails in the presence of combined neutral-beam and ICRF heating of a two-component plasmaNuclear Fusion, 1983
- Scaling law of ICRF-wave-enhanced beam-driven currentNuclear Fusion, 1983
- Quasi-linear model for ion cyclotron heating of tokamaks and mirrorsNuclear Fusion, 1978