An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping
<jats:title>Abstract</jats:title> <jats:p>Lower-hybrid current drive (LHCD) actuators are important components of modern day fusion experiments as well as proposed fusion reactors. However, simulations of LHCD often differ substantially from experimental results, an...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2023
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| Online Access: | https://hdl.handle.net/1721.1/147196 |
| _version_ | 1811091177460465664 |
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| author | Frank, SJ Wright, JC Hutchinson, IH Bonoli, PT |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Frank, SJ Wright, JC Hutchinson, IH Bonoli, PT |
| author_sort | Frank, SJ |
| collection | MIT |
| description | <jats:title>Abstract</jats:title>
<jats:p>Lower-hybrid current drive (LHCD) actuators are important components of modern day fusion experiments as well as proposed fusion reactors. However, simulations of LHCD often differ substantially from experimental results, and from each other, especially in the inferred power deposition profile shape. Here we investigate some possible causes of this discrepancy; ‘full-wave’ effects such as interference and diffraction, which are omitted from standard raytracing simulations and the breakdown of the raytracing near reflections and caustics. We compare raytracing simulations to state-of-the-art full-wave simulations using matched hot-plasma dielectric tensors in realistic tokamak scenarios for the first time. We show that differences between full-wave simulations and raytracing in previous work were primarily due to numerical and physical inconsistencies in the simulations, and we demonstrate that quantitative agreement between raytracing and converged full-wave simulations can be obtained in reactor relevant-scenarios and qualitative agreement can be obtained in situations with weak damping.</jats:p> |
| first_indexed | 2024-09-23T14:58:10Z |
| format | Article |
| id | mit-1721.1/147196 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:58:10Z |
| publishDate | 2023 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1471962023-01-19T03:10:52Z An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping Frank, SJ Wright, JC Hutchinson, IH Bonoli, PT Massachusetts Institute of Technology. Department of Nuclear Science and Engineering <jats:title>Abstract</jats:title> <jats:p>Lower-hybrid current drive (LHCD) actuators are important components of modern day fusion experiments as well as proposed fusion reactors. However, simulations of LHCD often differ substantially from experimental results, and from each other, especially in the inferred power deposition profile shape. Here we investigate some possible causes of this discrepancy; ‘full-wave’ effects such as interference and diffraction, which are omitted from standard raytracing simulations and the breakdown of the raytracing near reflections and caustics. We compare raytracing simulations to state-of-the-art full-wave simulations using matched hot-plasma dielectric tensors in realistic tokamak scenarios for the first time. We show that differences between full-wave simulations and raytracing in previous work were primarily due to numerical and physical inconsistencies in the simulations, and we demonstrate that quantitative agreement between raytracing and converged full-wave simulations can be obtained in reactor relevant-scenarios and qualitative agreement can be obtained in situations with weak damping.</jats:p> 2023-01-18T17:32:00Z 2023-01-18T17:32:00Z 2022 2023-01-18T17:26:49Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/147196 Frank, SJ, Wright, JC, Hutchinson, IH and Bonoli, PT. 2022. "An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping." Plasma Physics and Controlled Fusion, 64 (10). en 10.1088/1361-6587/AC89AE Plasma Physics and Controlled Fusion Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing arXiv |
| spellingShingle | Frank, SJ Wright, JC Hutchinson, IH Bonoli, PT An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping |
| title | An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping |
| title_full | An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping |
| title_fullStr | An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping |
| title_full_unstemmed | An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping |
| title_short | An Assessment Of Full-Wave Effects On Maxwellian Lower-Hybrid Wave Damping |
| title_sort | assessment of full wave effects on maxwellian lower hybrid wave damping |
| url | https://hdl.handle.net/1721.1/147196 |
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