Analytical edge power loss at the lower hybrid resonance: comparison with ANTITER IV and application to ICRH systems

In non-inverted heating scenarios, a lower hybrid (LH) resonance can appear in the plasma edge of tokamaks. This resonance can lead to large edge power deposition when heating in the ion cyclotron resonance frequency (ICRF) range. In this paper, the edge power loss associated with this LH resonance...

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Bibliographic Details
Published inarXiv.org
Main Authors Maquet, Vincent, Druart, Adrien, Messiaen, André
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 23.01.2021
Subjects
Absorption
Cold plasmas
Computation
Cyclotron frequency
Cyclotron resonance
Electric fields
Electric power loss
Heating
Ion cyclotron radiation
Ions
Nuclear power plants
Numerical integration
Tokamak devices
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Summary:In non-inverted heating scenarios, a lower hybrid (LH) resonance can appear in the plasma edge of tokamaks. This resonance can lead to large edge power deposition when heating in the ion cyclotron resonance frequency (ICRF) range. In this paper, the edge power loss associated with this LH resonance is analytically computed for a cold plasma description using an asymptotic approach and analytical continuation. This power loss can be directly linked to the local radial electric field and is then compared to the corresponding power loss computed with the semi-analytical code ANTITER IV. This method offers the possibility to check the precision of the numerical integration made in ANTITER IV and gives insights in the physics underlying the edge power absorption. Finally, solutions to minimize this edge power absorption are investigated and applied to the case of ITER's ion cyclotron resonance heating (ICRH) launcher. This study is also of direct relevance to DEMO.
ISSN:2331-8422