Radiofrequency sheath rectification on WEST: application of the sheath-equivalent dielectric layer technique in tokamak geometry<sup>*</sup>
Abstract Radiofrequency sheath rectification is a phenomenon relevant to the operation of Ion Cyclotron Range of Frequencies (ICRFs) actuators in tokamaks. Techniques to model the sheath rectification on 3D ICRF antenna geometries have only recently become available (Shiraiw et al 2023 Nucl. Fusion 63 026024; Beers et al 2021 Phys. Plasmas 28 093503). In this work, we apply the ‘sheath-equivalent dielectric layer’ technique, used previously only on linear devices (Beers et al 2021 Phys. Plasmas 28 103508), in tokamak geometry, computing rectified sheath potentials on the WEST ICRF antenna. Advancing the state of the art in sheath rectification modeling, we compute the sheath potentials not just on the limiters, but also on the Faraday Screen bars. The calculations show a peak rectified DC potential of 300 V on the limiters and 500 V on the Faraday screen. Assuming a typical sputtering yield curve, the RF sheath rectification increases the sputtering yield from the limiters by a factor of 2.6 w.r.t. the sputtering due to the non-rectified thermal sheath.
Authors
- G. Urbanczyk (ORCID: https://orcid.org/0000-0002-4026-6802)
- Jeremy D. Lore (ORCID: https://orcid.org/0000-0002-9192-465X)
- C. C. Klepper (ORCID: https://orcid.org/0000-0001-9107-8337)
- Walid Helou (ORCID: https://orcid.org/0000-0002-7689-7753)
- J. Gunn
- L. Colas (ORCID: https://orcid.org/0000-0002-4573-3326)
- J. Hillairet (ORCID: https://orcid.org/0000-0002-1073-6383)
- A. Grosjean (ORCID: https://orcid.org/0000-0002-2166-5621)
- W. Tierens (ORCID: https://orcid.org/0000-0002-6979-8140)
- J. R. Myra (ORCID: https://orcid.org/0000-0001-5939-8429)
- Atul Kumar (ORCID: https://orcid.org/0000-0002-7747-5210)
Institutions
- ITER (FR)
- Oak Ridge National Laboratory (US)
- Centre National de la Recherche Scientifique (FR)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Centre de Gestion Scientifique (FR)
- CEA Cadarache (FR)
- Lodestar Research Corporation (United States) (US)
- Institut Jean Lamour (FR)
- University of Tennessee at Knoxville (US)
- Université de Lorraine (FR)
Publication Details
- Journal
- Nuclear Fusion
- Published
- 2024-09-27
- DOI
- https://doi.org/10.1088/1741-4326/ad80a9
- Citations
- 9
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 5.94
Funders
- U.S. Department of Energy
- Battelle
- UT-Battelle
- Office of Science
- Basic Energy Sciences
- Advanced Scientific Computing Research
- Fusion Energy Sciences