## Application of the parareal algorithm to simulations of ELMs in ITER plasma

## Abstract

This paper explores the application of the parareal algorithm to simulations of ELMs in ITER plasma. The primary focus of this research is identifying the parameters that lead to optimum performance. Since the plasma dynamics vary extremely fast during an ELM cycle, a straightforward application of the algorithm is not possible and a modification to the standard parareal correction is implemented. The size of the time chunks also have an impact on the performance and needs to be optimized. in conclusion, a computational gain of 7.8 is obtained with 48 processors to illustrate that the parareal algorithm can be successfully applied to ELM plasma.

- Authors:

- Culham Science Centre, Oxon (United Kingdom)
- Max-Planck-Institut fur Plasmaphysik, Garching (Germany)
- ITER Organization, St. Paul Lez Durance (France)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

- Publication Date:

- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 1504000

- Grant/Contract Number:
- AC05-00OR22725

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Computer Physics Communications

- Additional Journal Information:
- Journal Volume: 235; Journal Issue: C; Journal ID: ISSN 0010-4655

- Publisher:
- Elsevier

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 97 MATHEMATICS AND COMPUTING; Time parallelization; Parareal algorithm; Scrape off layer (SOL); SOLPS; Magnetically confined plasmas; Edge localized modes or ELMs; ITER; Tokamak

### Citation Formats

```
Samaddar, Debasmita, Coster, D. P., Bonnin, X., Berry, Lee A., Elwasif, Wael R., and Batchelor, Donald B. Application of the parareal algorithm to simulations of ELMs in ITER plasma. United States: N. p., 2018.
Web. doi:10.1016/j.cpc.2018.08.007.
```

```
Samaddar, Debasmita, Coster, D. P., Bonnin, X., Berry, Lee A., Elwasif, Wael R., & Batchelor, Donald B. Application of the parareal algorithm to simulations of ELMs in ITER plasma. United States. doi:10.1016/j.cpc.2018.08.007.
```

```
Samaddar, Debasmita, Coster, D. P., Bonnin, X., Berry, Lee A., Elwasif, Wael R., and Batchelor, Donald B. Wed .
"Application of the parareal algorithm to simulations of ELMs in ITER plasma". United States. doi:10.1016/j.cpc.2018.08.007. https://www.osti.gov/servlets/purl/1504000.
```

```
@article{osti_1504000,
```

title = {Application of the parareal algorithm to simulations of ELMs in ITER plasma},

author = {Samaddar, Debasmita and Coster, D. P. and Bonnin, X. and Berry, Lee A. and Elwasif, Wael R. and Batchelor, Donald B.},

abstractNote = {This paper explores the application of the parareal algorithm to simulations of ELMs in ITER plasma. The primary focus of this research is identifying the parameters that lead to optimum performance. Since the plasma dynamics vary extremely fast during an ELM cycle, a straightforward application of the algorithm is not possible and a modification to the standard parareal correction is implemented. The size of the time chunks also have an impact on the performance and needs to be optimized. in conclusion, a computational gain of 7.8 is obtained with 48 processors to illustrate that the parareal algorithm can be successfully applied to ELM plasma.},

doi = {10.1016/j.cpc.2018.08.007},

journal = {Computer Physics Communications},

number = C,

volume = 235,

place = {United States},

year = {2018},

month = {9}

}

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