Resilience of quasi-isodynamic stellarators against trapped-particle instabilities.

Energetic particle transport in compact quasi-axisymmetric stellarators

UW-CPTC 07-4 ECRH and its effects on neoclassical transport in stellarators

Abstract Energetic electron populations can substantially modify the neoclassical transport properties in stellarators. A model accounting for this change in transport is developed assuming the presence of electron cyclotron resonance heating (ECRH). The quasilinear diffusion coefficient for second harmonic X-mode ECRH is developed for a bumpy stellarator. Care is taken in accounting for the pi...

Quasi-particle properties of trapped Fermi gases

We develop a consistent formalism in order to explore the effects of density and spin fluctuations on the quasi-particle properties and on the pairing critical temperature of a trapped Fermi gas on the attractive side of a Feshbach resonance. We first analyze the quasi-particle properties of a gas due to interactions far from resonance (effective mass and lifetime, quasi-particle strength and e...

Theory and simulations of electrostatic field error transport

Asymmetries in applied electromagnetic fields cause plasma loss or compression in stellarators, tokamaks, and non-neutral plasmas. Here, this transport is studied using idealized simulations that follow guiding centers in given fields, neglecting collective effects on the plasma evolution, but including collisions at rate . For simplicity the magnetic field is assumed to be uniform; transport i...

Stability of spherically trapped three-dimensional Bose-Einstein condensates against macroscopic fragmentation

We consider spherically trapped Bose gases in three dimensions with contact interactions and investigate whether the Bose-Einstein condensate at zero temperature is stable against macroscopic fragmentation into a small number of mutually incoherent pieces. Our results are expressed in terms of a dimensionless interaction measure proportional to the Thomas-Fermi parameter. It is shown that while...