Academic Journal
Investigation of magnetic fluctuations in L-H and H-L transition dynamics on DIII-D
| Τίτλος: | Investigation of magnetic fluctuations in L-H and H-L transition dynamics on DIII-D |
|---|---|
| Συγγραφείς: | Ashton-Key, T, Andrew, Y, Kingham, R, Kim, E, Jones, C, Rhodes, T L, Schmitz, L, Yan, Z |
| Συνεισφορές: | EPSRC Centre for Doctoral Training in Nuclear Energy Futures, Fusion Energy Sciences |
| Πηγή: | Plasma Physics and Controlled Fusion ; volume 67, issue 2, page 025027 ; ISSN 0741-3335 1361-6587 |
| Στοιχεία εκδότη: | IOP Publishing |
| Έτος έκδοσης: | 2025 |
| Περιγραφή: | The dynamics of the L-H transition is not fully understood, with many parameters changing the threshold power to enter H-mode and the self-regulation between zonal flows and turbulence in the plasma edge. This paper is primarily a presentation of experimental results for DIII-D L-H and H-L transitions and speculation on the observations made. Power threshold analysis and measurements of pedestal temperatures for these transitions are presented. A comparison is made between an L-H transition and H-L transition of comparable P sep exhibiting oscillatory behaviour, showing symmetry between forward and backward transition dynamics. This paper shows the first observations of magnetic fluctuations during L-H and H-L transitions on DIII-D, and shows that L-H and H-L transitions have similar magnetic fluctuation dynamics. Information geometry analysis has been performed on measurements of plasma density fluctuations, perpendicular plasma velocity fluctuations, and magnetic field fluctuations to investigate the self-regulation and evolution of these variables during the transitions. Perpendicular flow evolution is shown to dominate the transition dynamics in both directions, but self-regulation behaviour is observed between all three variables. A strong correlation between magnetic fluctuation information rate and density fluctuation information rate for these two shots shows the strong influence of magnetic behaviour on both the L-H and H-L transition, and that these transition dynamics necessarily include electromagnetic effects. |
| Τύπος εγγράφου: | article in journal/newspaper |
| Γλώσσα: | unknown |
| DOI: | 10.1088/1361-6587/adaaea |
| DOI: | 10.1088/1361-6587/adaaea/pdf |
| Διαθεσιμότητα: | https://doi.org/10.1088/1361-6587/adaaea https://iopscience.iop.org/article/10.1088/1361-6587/adaaea https://iopscience.iop.org/article/10.1088/1361-6587/adaaea/pdf |
| Rights: | https://creativecommons.org/licenses/by/4.0/ ; https://iopscience.iop.org/info/page/text-and-data-mining |
| Αριθμός Καταχώρησης: | edsbas.530C7F5F |
| Βάση Δεδομένων: | BASE |
| FullText | Text: Availability: 0 CustomLinks: – Url: https://doi.org/10.1088/1361-6587/adaaea# Name: EDS - BASE (ns324271) Category: fullText Text: View record from BASE |
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| Header | DbId: edsbas DbLabel: BASE An: edsbas.530C7F5F RelevancyScore: 970 AccessLevel: 3 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 969.935607910156 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Investigation of magnetic fluctuations in L-H and H-L transition dynamics on DIII-D – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ashton-Key%2C+T%22">Ashton-Key, T</searchLink><br /><searchLink fieldCode="AR" term="%22Andrew%2C+Y%22">Andrew, Y</searchLink><br /><searchLink fieldCode="AR" term="%22Kingham%2C+R%22">Kingham, R</searchLink><br /><searchLink fieldCode="AR" term="%22Kim%2C+E%22">Kim, E</searchLink><br /><searchLink fieldCode="AR" term="%22Jones%2C+C%22">Jones, C</searchLink><br /><searchLink fieldCode="AR" term="%22Rhodes%2C+T+L%22">Rhodes, T L</searchLink><br /><searchLink fieldCode="AR" term="%22Schmitz%2C+L%22">Schmitz, L</searchLink><br /><searchLink fieldCode="AR" term="%22Yan%2C+Z%22">Yan, Z</searchLink> – Name: Author Label: Contributors Group: Au Data: EPSRC Centre for Doctoral Training in Nuclear Energy Futures<br />Fusion Energy Sciences – Name: TitleSource Label: Source Group: Src Data: Plasma Physics and Controlled Fusion ; volume 67, issue 2, page 025027 ; ISSN 0741-3335 1361-6587 – Name: Publisher Label: Publisher Information Group: PubInfo Data: IOP Publishing – Name: DatePubCY Label: Publication Year Group: Date Data: 2025 – Name: Abstract Label: Description Group: Ab Data: The dynamics of the L-H transition is not fully understood, with many parameters changing the threshold power to enter H-mode and the self-regulation between zonal flows and turbulence in the plasma edge. This paper is primarily a presentation of experimental results for DIII-D L-H and H-L transitions and speculation on the observations made. Power threshold analysis and measurements of pedestal temperatures for these transitions are presented. A comparison is made between an L-H transition and H-L transition of comparable P sep exhibiting oscillatory behaviour, showing symmetry between forward and backward transition dynamics. This paper shows the first observations of magnetic fluctuations during L-H and H-L transitions on DIII-D, and shows that L-H and H-L transitions have similar magnetic fluctuation dynamics. Information geometry analysis has been performed on measurements of plasma density fluctuations, perpendicular plasma velocity fluctuations, and magnetic field fluctuations to investigate the self-regulation and evolution of these variables during the transitions. Perpendicular flow evolution is shown to dominate the transition dynamics in both directions, but self-regulation behaviour is observed between all three variables. A strong correlation between magnetic fluctuation information rate and density fluctuation information rate for these two shots shows the strong influence of magnetic behaviour on both the L-H and H-L transition, and that these transition dynamics necessarily include electromagnetic effects. – Name: TypeDocument Label: Document Type Group: TypDoc Data: article in journal/newspaper – Name: Language Label: Language Group: Lang Data: unknown – Name: DOI Label: DOI Group: ID Data: 10.1088/1361-6587/adaaea – Name: DOI Label: DOI Group: ID Data: 10.1088/1361-6587/adaaea/pdf – Name: URL Label: Availability Group: URL Data: https://doi.org/10.1088/1361-6587/adaaea<br />https://iopscience.iop.org/article/10.1088/1361-6587/adaaea<br />https://iopscience.iop.org/article/10.1088/1361-6587/adaaea/pdf – Name: Copyright Label: Rights Group: Cpyrght Data: https://creativecommons.org/licenses/by/4.0/ ; https://iopscience.iop.org/info/page/text-and-data-mining – Name: AN Label: Accession Number Group: ID Data: edsbas.530C7F5F |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edsbas&AN=edsbas.530C7F5F |
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