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# Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence

## Abstract

An interplay between fluctuation driven toroidal axisymmetric flows (convective cell modes) and resistive ballooning mode turbulence after the pedestal collapse is numerically studied by a four-field reduced MHD model in the BOUT++ framework. The strong flow shear suppresses the radial transport of pressure filaments, and the pressure profile in the pedestal region is partially recovered. As a result, a secondary instability is quasilinearly excited, which yields a secondary collapse. Here, the subsequent damped oscillation is also analyzed by phase diagram analysis.

- Authors:

- National Institutes for Quantum and Radiological Science and Technology, Aomori (Japan)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of York, York (United Kingdom)

- Publication Date:

- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)

- OSTI Identifier:
- 1568015

- Alternate Identifier(s):
- OSTI ID: 1512547

- Report Number(s):
- [LLNL-JRNL-789211]

[Journal ID: ISSN 1070-664X; 987556]

- Grant/Contract Number:
- [AC52-07NA27344]

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Physics of Plasmas

- Additional Journal Information:
- [ Journal Volume: 26; Journal Issue: 5]; Journal ID: ISSN 1070-664X

- Publisher:
- American Institute of Physics (AIP)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

### Citation Formats

```
Seto, H., Xu, X. Q., Dudson, B. D., and Yagi, M. Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence. United States: N. p., 2019.
Web. doi:10.1063/1.5086998.
```

```
Seto, H., Xu, X. Q., Dudson, B. D., & Yagi, M. Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence. United States. doi:10.1063/1.5086998.
```

```
Seto, H., Xu, X. Q., Dudson, B. D., and Yagi, M. Tue .
"Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence". United States. doi:10.1063/1.5086998.
```

```
@article{osti_1568015,
```

title = {Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence},

author = {Seto, H. and Xu, X. Q. and Dudson, B. D. and Yagi, M.},

abstractNote = {An interplay between fluctuation driven toroidal axisymmetric flows (convective cell modes) and resistive ballooning mode turbulence after the pedestal collapse is numerically studied by a four-field reduced MHD model in the BOUT++ framework. The strong flow shear suppresses the radial transport of pressure filaments, and the pressure profile in the pedestal region is partially recovered. As a result, a secondary instability is quasilinearly excited, which yields a secondary collapse. Here, the subsequent damped oscillation is also analyzed by phase diagram analysis.},

doi = {10.1063/1.5086998},

journal = {Physics of Plasmas},

number = [5],

volume = [26],

place = {United States},

year = {2019},

month = {5}

}

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DOI: 10.1063/1.5086998

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