110 citations · 179 across the 6 of their papers we have counts for
6 papers
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…
On-surface potential and radial electric field variations in electron root stellarator plasmas
J. M. García-Regaña, T. Estrada, I. Calvo +8
In the present work we report recent radial electric field measurements carried out with the Doppler reflectometry system in the TJ-II stellarator. The study focuses on the fact th…
Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma
Sarah L. Newton, Per Helander, Albert Mollén +1
The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fus…
Impurities in a non-axisymmetric plasma: transport and effect on bootstrap current
Albert Mollén, Matt Landreman, Håkan M. Smith +2
Impurities cause radiation losses and plasma dilution, and in stellarator plasmas the neoclassical ambipolar radial electric field is often unfavorable for avoiding strong impurity…
Comparison of particle trajectories and collision operators for collisional transport in nonaxisymmetric plasmas
Matt Landreman, Håkan M Smith, Albert Mollén +1
In this work, we examine the validity of several common simplifying assumptions used in numerical neoclassical calculations for nonaxisymmetric plasmas, both by using a new continu…
Impurity transport in trapped electron mode driven turbulence
A. Mollén, I. Pusztai, T. Fülöp +1
Trapped electron mode turbulence is studied by gyrokinetic simulations with the GYRO code and an analytical model including the effect of a poloidally varying electrostatic potenti…