49 citations · 159 across the 11 of their papers we have counts for
11 papers
Optimisation of Gyrokinetic Microstability Using Adjoint Methods
Georgia Acton, Michael Barnes, Sarah Newton +1
Microinstabilities drive turbulent fluctuations in inhomogeneous, magnetized plasmas. In the context of magnetic confinement fusion devices, this leads to an enhanced transport of…
Runaway dynamics in reactor-scale spherical tokamak disruptions
E. Berger, I. Pusztai, S. L. Newton +4
Understanding generation and mitigation of runaway electrons in disruptions is important for the safe operation of future tokamaks. In this paper we investigate runaway dynamics in…
Effect of Two-Stage Shattered Pellet Injection on Tokamak Disruptions
O. Vallhagen, I. Pusztai, M. Hoppe +2
An effective disruption mitigation system in a tokamak reactor should limit the exposure of the wall to localized heat losses and to the impact of high current runaway electron bea…
The hot-tail runaway seed landscape during the thermal quench in tokamaks
Ida Svenningsson, Ola Embreus, Mathias Hoppe +2
Runaway electron populations seeded from the hot-tail generated by the rapid cooling in plasma-terminating disruptions are a serious concern for next-step tokamak devices such as I…
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…
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…
Stellarator bootstrap current and plasma flow velocity at low collisionality
P. Helander, F. I. Parra, S. L. Newton
The bootstrap current and flow velocity of a low-collisionality stellarator plasma are calculated. As far as possible, the analysis is carried out in a uniform way across all low-c…
Effect of bremsstrahlung radiation emission on distributions of runaway electrons in magnetized plasmas
Ola Embréus, Adam Stahl, Sarah Newton +3
Bremsstrahlung radiation is an important energy loss mechanism for energetic electrons in plasmas. In this paper we investigate the effect of bremsstrahlung radiation reaction on t…
Numerical calculation of ion runaway distributions
Ola Embréus, Sarah Newton, Adam Stahl +2
Ions accelerated by electric fields (so-called runaway ions) in plasmas may explain observations in solar flares and fusion experiments, however limitations of previous analytic wo…
Electromagnetic effects in the stabilization of turbulence by sheared flow
M. D. J. Cole, S. L. Newton, S. C. Cowley +4
We have extended our study of the competition between the drive and stabilization of plasma microinstabilities by sheared flow to include electromagnetic effects at low plasma …
Understanding the effect of sheared flow on microinstabilities
Sarah L. Newton, Steve C. Cowley, Nuno F. Loureiro
The competition between the drive and stabilization of plasma microinstabilities by sheared flow is investigated, focusing on the ion temperature gradient mode. Using a twisting mo…