# Kinetic Modifications to MHD Phenomena in Toroidal Plasmas

## Abstract

Particle kinetic effects involving small spatial and fast temporal scales can strongly affect MHD phenomena and the long time behavior of plasmas. In particular, kinetic effects such as finite ion gyroradii, trapped particle dynamics, and wave-particle resonances have been shown to greatly modify the stability of MHD modes. Here, the kinetic effects of trapped electron dynamics and finite ion gyroradii are shown to have a large stabilizing effect on kinetic ballooning modes in low aspect ratio toroidal plasmas such as NSTX [National Spherical Torus Experiment]. We also present the analysis of Toroidicity-induced Alfven Eigenmodes (TAEs) destabilized by fast neutral-beam injected ions in NSTX experiments and TAE stability in ITER due to alpha-particles and MeV negatively charged neutral beam injected ions.

- Authors:

- Publication Date:

- Research Org.:
- Princeton Plasma Physics Lab., Princeton, NJ (US)

- Sponsoring Org.:
- USDOE Office of Science (SC) (US)

- OSTI Identifier:
- 835899

- Report Number(s):
- PPPL-4005

TRN: US0500428

- DOE Contract Number:
- AC02-76CH03073

- Resource Type:
- Technical Report

- Resource Relation:
- Other Information: PBD: 3 Sep 2004

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ALPHA PARTICLES; ASPECT RATIO; KINETICS; MODIFICATIONS; STABILITY; TRAPPED ELECTRONS; ALFVEN WAVES; BALLOONING INSTABILITIES; FINITE LARMOR EFFECTS; KINETIC THEORY; WAVE INTERACTION, PARTICLES; TOROIDICITY-INDUCED ALFVEN EIGENMODE (TAE); KINETIC BALLOONING MODE (KBM)

### Citation Formats

```
C.Z. Cheng, N.N. Gorelenkov, G.J. Kramer, and E. Fredrickson.
```*Kinetic Modifications to MHD Phenomena in Toroidal Plasmas*. United States: N. p., 2004.
Web. doi:10.2172/835899.

```
C.Z. Cheng, N.N. Gorelenkov, G.J. Kramer, & E. Fredrickson.
```*Kinetic Modifications to MHD Phenomena in Toroidal Plasmas*. United States. doi:10.2172/835899.

```
C.Z. Cheng, N.N. Gorelenkov, G.J. Kramer, and E. Fredrickson. Fri .
"Kinetic Modifications to MHD Phenomena in Toroidal Plasmas". United States. doi:10.2172/835899. https://www.osti.gov/servlets/purl/835899.
```

```
@article{osti_835899,
```

title = {Kinetic Modifications to MHD Phenomena in Toroidal Plasmas},

author = {C.Z. Cheng and N.N. Gorelenkov and G.J. Kramer and E. Fredrickson},

abstractNote = {Particle kinetic effects involving small spatial and fast temporal scales can strongly affect MHD phenomena and the long time behavior of plasmas. In particular, kinetic effects such as finite ion gyroradii, trapped particle dynamics, and wave-particle resonances have been shown to greatly modify the stability of MHD modes. Here, the kinetic effects of trapped electron dynamics and finite ion gyroradii are shown to have a large stabilizing effect on kinetic ballooning modes in low aspect ratio toroidal plasmas such as NSTX [National Spherical Torus Experiment]. We also present the analysis of Toroidicity-induced Alfven Eigenmodes (TAEs) destabilized by fast neutral-beam injected ions in NSTX experiments and TAE stability in ITER due to alpha-particles and MeV negatively charged neutral beam injected ions.},

doi = {10.2172/835899},

journal = {},

number = ,

volume = ,

place = {United States},

year = {2004},

month = {9}

}