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BEGIN:VEVENT
DTSTAMP:20260428T035351Z
DTSTART;VALUE=DATE-TIME:20190603T150000
DTEND;VALUE=DATE-TIME:20190603T160000
SUMMARY:Rogerio Jorge: A moment-based model for plasma dynamics at arbitr
 ary collisionality
TZID:Europe/London
UID:20190603-8a1785d76850d72d0168942b5d63608c@warwick.ac.uk
CREATED:20190513T135757Z
DESCRIPTION:Abstract: Despite significant development over the last decad
 es\, a model able to describe the periphery region of magnetic confineme
 nt fusion devices\, extending from the edge to the far scrape-off layer\
 , is still missing. The lack of a proper model has undermined our abilit
 y to properly simulate the plasma dynamics in this region\, which is nec
 essary to predict the heat flux to the vessel wall of future fusion devi
 ces\, the L-H transition\, and ELM dynamics. These are some of the most 
 important issues on the way to a fusion reactor. In this work\, a drift-
 kinetic and a gyrokinetic model able to describe the plasma dynamics in 
 the tokamak periphery are developed\, which take into account electrosta
 tic fluctuations at all relevant scales\, allowing for comparable amplit
 udes of background and fluctuating components. In addition\, the models 
 implement a full Coulomb collision operator\, and are therefore valid at
  arbitrary collisionality regimes. For an efficient numerical implementa
 tion of the models\, the resulting kinetic equations are projected onto 
 a Hermite-Laguerre velocity-space polynomial basis\, obtaining a moment-
 hierarchy. The use of systematic closures to truncate the moment-hierarc
 hy equation\, such as the semi-collisional closure\, allows for the stra
 ightforward adjustment of the kinetic physics content of the model. In t
 he electrostatic high collisionality regime\, our models are therefore r
 educed to an improved set of drift-reduced Braginskii equations\, which 
 are widely used in scrape-off layer simulations. The first numerical stu
 dies based on our models are carried out\, shedding light on the interpl
 ay between collisional\, using the Coulomb collision operator\, and coll
 isionless mechanisms. In particular\, the dynamics of electron-plasma wa
 ves and the drift-wave instability are studied at arbitrary collisionali
 ty. A comparison is made with the collisionless limit and simplified col
 lision operators used in state-of-the-art simulation codes\, where large
  deviations in the growth rates and eigenmode spectra are found\, especi
 ally at the levels of collisionality relevant for present and future mag
 netic confinement fusion devices.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20190513T135757Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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