Microinstability in the pedestal:
The pedestal is a region of increased equilibrium pressure gradients near the edge of high performance toroidal plasmas. While the MHD properties of this region have been fairly well-characterized, pedestal microinstabilities and turbulence remain rela- tively unexplored, particularly in steep gradi...
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| Format: | Abschlussarbeit Elektronisch Tagungsbericht E-Book |
| Sprache: | English |
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Oxford
University of Oxford
2020
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| Zusammenfassung: | The pedestal is a region of increased equilibrium pressure gradients near the edge of high performance toroidal plasmas. While the MHD properties of this region have been fairly well-characterized, pedestal microinstabilities and turbulence remain rela- tively unexplored, particularly in steep gradient regions. In this thesis, we describe a new microinstability caused by the steep equilibrium temperature gradients and com- plex magnetic geometry. This instability has a critical temperature gradient that is much higher than core temperature gradients, and hence likely exists only in pedestals. Basic analytic arguments show that in the presence of magnetic shear and steep temperature gradients, this mode must be one of the fastest growing modes. In realistic magnetic equilibria that we study, it is the fastest growing mode at almost all scales comparable to ion and electron gyroradii. Therefore, it is a robust feature of pedestal microinstability. We also investigate nonlinear pedestal microturbulence. We find the turbulent satu- rated state to be inhomogeneous in the poloidal angle, in strong contrast to core micro- turbulence that is typically well-correlated for long distances along magnetic field lines. Turbulence is particularly strong in poloidal regions of (i) weaker local magnetic shear and (ii) shorter distances between flux surfaces. |
| Beschreibung: | 1 Online-Ressource (161 Seiten) Illustrationen, Diagramme |
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| 520 | 3 | |a The pedestal is a region of increased equilibrium pressure gradients near the edge of high performance toroidal plasmas. While the MHD properties of this region have been fairly well-characterized, pedestal microinstabilities and turbulence remain rela- tively unexplored, particularly in steep gradient regions. In this thesis, we describe a new microinstability caused by the steep equilibrium temperature gradients and com- plex magnetic geometry. This instability has a critical temperature gradient that is much higher than core temperature gradients, and hence likely exists only in pedestals. Basic analytic arguments show that in the presence of magnetic shear and steep temperature gradients, this mode must be one of the fastest growing modes. In realistic magnetic equilibria that we study, it is the fastest growing mode at almost all scales comparable to ion and electron gyroradii. Therefore, it is a robust feature of pedestal microinstability. We also investigate nonlinear pedestal microturbulence. We find the turbulent satu- rated state to be inhomogeneous in the poloidal angle, in strong contrast to core micro- turbulence that is typically well-correlated for long distances along magnetic field lines. Turbulence is particularly strong in poloidal regions of (i) weaker local magnetic shear and (ii) shorter distances between flux surfaces. | |
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Datensatz im Suchindex
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| author | Parisi, Jason ca. 20./21. Jhr |
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| discipline | Physik |
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| format | Thesis Electronic Conference Proceeding eBook |
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| spelling | Parisi, Jason ca. 20./21. Jhr. Verfasser (DE-588)1194014836 aut Microinstability in the pedestal Jason Parisi Oxford University of Oxford 2020 1 Online-Ressource (161 Seiten) Illustrationen, Diagramme txt rdacontent c rdamedia cr rdacarrier Dissertation University of Oxford 2020 The pedestal is a region of increased equilibrium pressure gradients near the edge of high performance toroidal plasmas. While the MHD properties of this region have been fairly well-characterized, pedestal microinstabilities and turbulence remain rela- tively unexplored, particularly in steep gradient regions. In this thesis, we describe a new microinstability caused by the steep equilibrium temperature gradients and com- plex magnetic geometry. This instability has a critical temperature gradient that is much higher than core temperature gradients, and hence likely exists only in pedestals. Basic analytic arguments show that in the presence of magnetic shear and steep temperature gradients, this mode must be one of the fastest growing modes. In realistic magnetic equilibria that we study, it is the fastest growing mode at almost all scales comparable to ion and electron gyroradii. Therefore, it is a robust feature of pedestal microinstability. We also investigate nonlinear pedestal microturbulence. We find the turbulent satu- rated state to be inhomogeneous in the poloidal angle, in strong contrast to core micro- turbulence that is typically well-correlated for long distances along magnetic field lines. Turbulence is particularly strong in poloidal regions of (i) weaker local magnetic shear and (ii) shorter distances between flux surfaces. Kernfusion (DE-588)4030323-8 gnd rswk-swf Energievorrat (DE-588)4070814-7 gnd rswk-swf Fusionsplasma (DE-588)4617284-1 gnd rswk-swf Mikroinstabilität (DE-588)4518168-8 gnd rswk-swf Erneuerbare Energien (DE-588)4068598-6 gnd rswk-swf Renewable energy sources Nuclear fusion Power resources (DE-588)4113937-9 Hochschulschrift 2020 gnd-content Mikroinstabilität (DE-588)4518168-8 s Fusionsplasma (DE-588)4617284-1 s Kernfusion (DE-588)4030323-8 s Erneuerbare Energien (DE-588)4068598-6 s Energievorrat (DE-588)4070814-7 s DE-604 Parra, Felix dgs University of Oxford degree granting institution Sonstige oth http://ora.ox.ac.uk/objects/uuid:7688987b-0b12-41b9-909d-0d473fd6ac63 Archivierung kostenfrei Volltext |
| spellingShingle | Parisi, Jason ca. 20./21. Jhr Microinstability in the pedestal Kernfusion (DE-588)4030323-8 gnd Energievorrat (DE-588)4070814-7 gnd Fusionsplasma (DE-588)4617284-1 gnd Mikroinstabilität (DE-588)4518168-8 gnd Erneuerbare Energien (DE-588)4068598-6 gnd |
| subject_GND | (DE-588)4030323-8 (DE-588)4070814-7 (DE-588)4617284-1 (DE-588)4518168-8 (DE-588)4068598-6 (DE-588)4113937-9 |
| title | Microinstability in the pedestal |
| title_auth | Microinstability in the pedestal |
| title_exact_search | Microinstability in the pedestal |
| title_exact_search_txtP | Microinstability in the pedestal |
| title_full | Microinstability in the pedestal Jason Parisi |
| title_fullStr | Microinstability in the pedestal Jason Parisi |
| title_full_unstemmed | Microinstability in the pedestal Jason Parisi |
| title_short | Microinstability in the pedestal |
| title_sort | microinstability in the pedestal |
| topic | Kernfusion (DE-588)4030323-8 gnd Energievorrat (DE-588)4070814-7 gnd Fusionsplasma (DE-588)4617284-1 gnd Mikroinstabilität (DE-588)4518168-8 gnd Erneuerbare Energien (DE-588)4068598-6 gnd |
| topic_facet | Kernfusion Energievorrat Fusionsplasma Mikroinstabilität Erneuerbare Energien Hochschulschrift 2020 |
| url | http://ora.ox.ac.uk/objects/uuid:7688987b-0b12-41b9-909d-0d473fd6ac63 |
| work_keys_str_mv | AT parisijason microinstabilityinthepedestal AT parrafelix microinstabilityinthepedestal AT universityofoxforddegreegrantinginstitution microinstabilityinthepedestal |