Nonlinear electromagnetic stabilization of microturbulence by fast ions
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hdl:2117/109786
Tipus de documentProjecte Final de Màster Oficial
Data2017-09-04
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
e.
Abstract
In plasma physics, the specific aspect of the interaction between highly energetic ions
and microturbulence is still an open problem and has a big impact on the plasma overall
confinement quality. In the present work we investigate an experimental discharge where fast
ions are thought to interact with the plasma and stabilize microturbulence activity, leading
to an overall improvement of the plasma confinement on the ASDEX Upgrade tokamak.
To quantify the impact of fast ions on the stabilization of Ion Temperature Gradient (ITG)
microturbulence, and making use of state of the art codes GENE and FIDO, we simulate
an experimental discharge in which high values of central ion temperature were measured.
Due to the highly electromagnetic particularity of the discharges, a second class of instability
is present, the Kinetic Ballooning Mode (KBM). Depending on the safety factor q, KBM
instability can have a great impact on the final ion heat flux levels. Nonetheless, we find
that fast ions have a pertinent impact on the reduction of ion heat flux for the discharges in
consideration, and provide a microturbulence stabilizing mechanism.
TitulacióMÀSTER UNIVERSITARI EN ENGINYERIA NUCLEAR (Pla 2012)
Col·leccions
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mem-ria-felipe-nathan.pdf | 1,752Mb | Visualitza/Obre |