# Toroidal effects on ICRF heating and current drive

## Abstract

Numerical studies, performed with the Monte-Carlo code FIDO [1], of the evolution of the resonant-ion distribution function in the presence of ICRH in toroidal geometry are presented. In particular it is pointed out how the absorption of toroidal momentum from a wave field with finite parallel wave numbers causes spatial drift and diffusion, which together with the finite orbit widths of the tail ions is shown to have a large effect on the temperature profile of the resonant ion species and also to cause losses of high-energy ions to the wall [2]. Furthermore, it is found that the finite orbit width and the inward drift occuring for negative parallel wave numbers [3] each give rise to a new mechanism of minority-ion cyclotron current drive as compared to earlier models where the drift orbits of the resonant ions are confined to the magnetic flux surfaces. For high levels of coupled power these new mechanisms are found to be the dominating ones [4,5]. (c) 1999 American Institute of Physics.

- Authors:

- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8071 (United States)
- Alfoen Laboratory, Royal Institute of Technology, S-100 44 Stockholm, (Sweden)

- Publication Date:

- OSTI Identifier:
- 20216702

- Resource Type:
- Journal Article

- Journal Name:
- AIP Conference Proceedings

- Additional Journal Information:
- Journal Volume: 485; Journal Issue: 1; Other Information: PBD: 20 Sep 1999; Journal ID: ISSN 0094-243X

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICR HEATING; CURRENT-DRIVE HEATING; MONTE CARLO METHOD; MAXWELL EQUATIONS; PLASMA SIMULATION; FOKKER-PLANCK EQUATION; POWER RANGE 01-10 MW; THEORETICAL DATA

### Citation Formats

```
Carlsson, J., Hellsten, T., and Hedin, J.
```*Toroidal effects on ICRF heating and current drive*. United States: N. p., 1999.
Web. doi:10.1063/1.59685.

```
Carlsson, J., Hellsten, T., & Hedin, J.
```*Toroidal effects on ICRF heating and current drive*. United States. doi:10.1063/1.59685.

```
Carlsson, J., Hellsten, T., and Hedin, J. Mon .
"Toroidal effects on ICRF heating and current drive". United States. doi:10.1063/1.59685.
```

```
@article{osti_20216702,
```

title = {Toroidal effects on ICRF heating and current drive},

author = {Carlsson, J. and Hellsten, T. and Hedin, J.},

abstractNote = {Numerical studies, performed with the Monte-Carlo code FIDO [1], of the evolution of the resonant-ion distribution function in the presence of ICRH in toroidal geometry are presented. In particular it is pointed out how the absorption of toroidal momentum from a wave field with finite parallel wave numbers causes spatial drift and diffusion, which together with the finite orbit widths of the tail ions is shown to have a large effect on the temperature profile of the resonant ion species and also to cause losses of high-energy ions to the wall [2]. Furthermore, it is found that the finite orbit width and the inward drift occuring for negative parallel wave numbers [3] each give rise to a new mechanism of minority-ion cyclotron current drive as compared to earlier models where the drift orbits of the resonant ions are confined to the magnetic flux surfaces. For high levels of coupled power these new mechanisms are found to be the dominating ones [4,5]. (c) 1999 American Institute of Physics.},

doi = {10.1063/1.59685},

journal = {AIP Conference Proceedings},

issn = {0094-243X},

number = 1,

volume = 485,

place = {United States},

year = {1999},

month = {9}

}