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# Orbit-modulated plasma transport and sources

## Abstract

In this work, using a general conservative gyrokinetic framework in axisymmetric magnetic geometry, the steady-state orbit-loss boundary fluxes are demonstrated to be predominantly determined by upstream transport (turbulent and collisional) and upstream sources and sinks. Within the framework, the details of the equilibrium orbits, even accounting for large but axisymmetric and time-independent electric fields and poloidal pressure gradients, are demonstrated to contribute only by modulating the upstream transport and source terms. This is true not only for gyrocenter fluxes, but also for any other moments that are expressible in terms of the adiabatic invariants that determine the orbits, such as parallel toroidal angular momentum. An explicit reformulation of the orbit-loss terms facilitates their evaluation via numerical diagnostics or reduced models. Finally, additional contributions for realistic cases, including those of fast ions and time-evolving equilibria, are briefly discussed.

- Authors:

- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

- Publication Date:

- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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

- OSTI Identifier:
- 1580272

- Grant/Contract Number:
- AC02-09CH11466

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Nuclear Fusion

- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 1; Journal ID: ISSN 0029-5515

- Publisher:
- IOP Science

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

### Citation Formats

```
Stoltzfus-Dueck, T. Orbit-modulated plasma transport and sources. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab5339.
```

```
Stoltzfus-Dueck, T. Orbit-modulated plasma transport and sources. United States. doi:10.1088/1741-4326/ab5339.
```

```
Stoltzfus-Dueck, T. Thu .
"Orbit-modulated plasma transport and sources". United States. doi:10.1088/1741-4326/ab5339.
```

```
@article{osti_1580272,
```

title = {Orbit-modulated plasma transport and sources},

author = {Stoltzfus-Dueck, T.},

abstractNote = {In this work, using a general conservative gyrokinetic framework in axisymmetric magnetic geometry, the steady-state orbit-loss boundary fluxes are demonstrated to be predominantly determined by upstream transport (turbulent and collisional) and upstream sources and sinks. Within the framework, the details of the equilibrium orbits, even accounting for large but axisymmetric and time-independent electric fields and poloidal pressure gradients, are demonstrated to contribute only by modulating the upstream transport and source terms. This is true not only for gyrocenter fluxes, but also for any other moments that are expressible in terms of the adiabatic invariants that determine the orbits, such as parallel toroidal angular momentum. An explicit reformulation of the orbit-loss terms facilitates their evaluation via numerical diagnostics or reduced models. Finally, additional contributions for realistic cases, including those of fast ions and time-evolving equilibria, are briefly discussed.},

doi = {10.1088/1741-4326/ab5339},

journal = {Nuclear Fusion},

number = 1,

volume = 60,

place = {United States},

year = {2019},

month = {10}

}

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