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Radially global neoclassical transport in tokamak pedestals

Stefan Buller (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers))
Gothenburg : Chalmers University of Technology, 2017.

Nuclear fusion has the potential to become a sustainable energy source
in the foreseeable future. The most developed system for fusion power
production is the tokamak, which magnetically confines a plasma at high
enough temperature for fusion reactions to take place.
Tokamaks operating in the H-mode feature the largest known steady
state density and temperature gradients, located in a region at the edge
of the plasma known as the pedestal. These steep gradients result from
a spontaneous reduction in turbulence, and as a result of these steep
gradients, the plasma behavior couples between nearby radial locations,
and can no longer be evaluated in terms of plasma parameters at a single
radius. The plasma behavior is said to be radially global. This makes
it challenging to model the transport of particles, heat, etc., which is
needed to design and evaluate future reactors.
In this thesis, we study collisional, radially-global transport in toka-
mak pedestals, using numerical methods to solve a drift-kinetic equation
for the distribution of particles in both velocity and configuration space.
Particular focus is put on the influence of non-trace impurities, and the
effects of changing the mass and charge of the bulk ions. Order unity
deviations from radially-local results are observed in plasma flows and
cross-field fluxes, both in the pedestal and the near-pedestal core. In ad-
dition, a significant radial transport of angular momentum arises in the
radially-global description, which may have implications for the plasma
rotation, which is understood as a crucial component for the transition
to H-mode.

Nyckelord: tokamak,fusion, drift-kinetics,collisional transport, transport, global effects, plasma physics

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Denna post skapades 2017-08-10. Senast ändrad 2017-08-10.
CPL Pubid: 250982


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Institutioner (Chalmers)

Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)


Hållbar utveckling
Fusion, plasma och rymdfysik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)

Relaterade publikationer

Inkluderade delarbeten:

Global effects on neoclassical transport in the pedestal with impurities

Neoclassical transport with non-trace impurities in density pedestals

Neoclassical flows in deuterium-helium plasma density pedestals

Isotope and density profile effects on pedestal neoclassical transport


Datum: 2017-09-01
Tid: 10:00
Lokal: PJ föreläsningssal, byggnad Origo vån 4, Fysikgården 2
Opponent: Assoc. Prof. Paolo Ricci, Swiss Plasma Center - Theory, École Polytechnique Fédérale de Lausanne, Schweiz

Ingår i serie

CTH-NT - Chalmers University of Technology, Nuclear Engineering 331