22 citations · 29 across the 6 of their papers we have counts for
6 papers
An adjoint-based method for optimizing MHD equilibria against the infinite-n, ideal ballooning mode
Rahul Gaur, Stefan Buller, Maximilian E. Ruth +3
We demonstrate a fast adjoint-based method to optimize tokamak and stellarator equilibria against a pressure-driven instability known as the infinite- ideal ballooning mode. We…
Optimization of quasisymmetric stellarators with self-consistent bootstrap current and energetic particle confinement
Matt Landreman, Stefan Buller, Michael Drevlak
Quasisymmetry can greatly improve the confinement of energetic particles and thermal plasma in a stellarator. The magnetic field of a quasisymmetric stellarator at high plasma pres…
Optimization of flux-surface density variation in stellarator plasmas with respect to the transport of collisional impurities
Stefan Buller, Håkan M. Smith, Albert Mollén +2
Avoiding impurity accumulation is a requirement for steady-state stellarator operation. The accumulation of impurities can be heavily affected by variations in their density on the…
Collisional transport of impurities with flux-surface varying density in stellarators
S. Buller, H. M. Smith, P. Helander +3
High-Z impurities in magnetic confinement devices are prone to develop density variations on the flux-surface, which can significantly affect their transport. In this paper, we gen…
Isotope and density profile effects on pedestal neoclassical transport
Stefan Buller, Istvan Pusztai
Cross-field neoclassical transport of heat, particles and momentum is studied in sharp density pedestals, with a focus on isotope and profile effects, using a radially global appro…
Neoclassical flows in deuterium-helium plasma density pedestals
Stefan Buller, Istvan Pusztai, Sarah Newton +1
In tokamak transport barriers, the radial scale of profile variations can be comparable to a typical ion orbit width, which makes the coupling of the distribution function across f…