# Linear analyses of peeling-ballooning modes in high beta pedestal plasmas

## Abstract

We present the linear simulations of edge plasma instabilities using the 3-field peeling-ballooning model and gyro-Landau-fluid model under the BOUT++ framework. A series of realistic equilibria of shifted circular geometry are generated by a global equilibrium solver CORSICA, where the Shafranov shift, elongation effects, and bootstrap current are included. The linear growth rate spectrum of the peeling-ballooning modes is shown in a wide range of pressure gradient and parallel current density in the pedestal region. The results show that the bootstrap current stabilizes high beta ballooning modes. Here, the simulations with different fractions of bootstrap current indicate a trend for the existence of the high beta peeling-ballooning mode stability region. Taking the kinetic effects into account, the linear simulations of kinetic peeling-ballooning mode using the gyro-Landau-fluid model show that this region can be accessed.

- Authors:

- Peking Univ., Beijing (China)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab
- Beihang Univ., Beijing (China)

- Publication Date:

- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

- OSTI Identifier:
- 1543864

- Alternate Identifier(s):
- OSTI ID: 1463056; OSTI ID: 1566003

- Report Number(s):
- LLNL-JRNL-747411

Journal ID: ISSN 1070-664X

- Grant/Contract Number:
- AC52-07NA27344; JRNL-747411

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Physics of Plasmas

- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 8; 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; Physics; Physics - Plasma physics

### Citation Formats

```
Sun, C. K., Xu, X. Q., Ma, C. H., and Li, B. Linear analyses of peeling-ballooning modes in high beta pedestal plasmas. United States: N. p., 2018.
Web. doi:10.1063/1.5028261.
```

```
Sun, C. K., Xu, X. Q., Ma, C. H., & Li, B. Linear analyses of peeling-ballooning modes in high beta pedestal plasmas. United States. doi:10.1063/1.5028261.
```

```
Sun, C. K., Xu, X. Q., Ma, C. H., and Li, B. Mon .
"Linear analyses of peeling-ballooning modes in high beta pedestal plasmas". United States. doi:10.1063/1.5028261. https://www.osti.gov/servlets/purl/1543864.
```

```
@article{osti_1543864,
```

title = {Linear analyses of peeling-ballooning modes in high beta pedestal plasmas},

author = {Sun, C. K. and Xu, X. Q. and Ma, C. H. and Li, B.},

abstractNote = {We present the linear simulations of edge plasma instabilities using the 3-field peeling-ballooning model and gyro-Landau-fluid model under the BOUT++ framework. A series of realistic equilibria of shifted circular geometry are generated by a global equilibrium solver CORSICA, where the Shafranov shift, elongation effects, and bootstrap current are included. The linear growth rate spectrum of the peeling-ballooning modes is shown in a wide range of pressure gradient and parallel current density in the pedestal region. The results show that the bootstrap current stabilizes high beta ballooning modes. Here, the simulations with different fractions of bootstrap current indicate a trend for the existence of the high beta peeling-ballooning mode stability region. Taking the kinetic effects into account, the linear simulations of kinetic peeling-ballooning mode using the gyro-Landau-fluid model show that this region can be accessed.},

doi = {10.1063/1.5028261},

journal = {Physics of Plasmas},

number = 8,

volume = 25,

place = {United States},

year = {2018},

month = {8}

}

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