12 papers
Collisionless dynamo seeds from phase mixing-induced electron slippage
István Pusztai, Lise Hanebring, James Juno
Magnetic fields permeating the Universe on the largest astrophysical scales are thought to result from dynamo amplification in weakly collisional turbulence, but the origin of the…
From Weibel seeds to collisionless dynamos beyond pair-plasmas
Lise Hanebring, James Juno, Ammar Hakim +2
Bridging the spatiotemporal scales of magnetic seed field generation and subsequent dynamo amplification in the weakly collisional intracluster medium presents an extreme numerical…
An analytical criterion for significant runaway electron generation in activated tokamaks
Björn Zaar, István Pusztai, Ida Ekmark +1
A disrupting plasma in a high-performance tokamak such as ITER or SPARC may generate large runaway electron currents that, upon impact with the tokamak wall, can cause serious dama…
Long lasting plasma density structures utilizing tailored density profiles
Mufei Luo, Caterina Riconda, Anna Grassi +4
Using fully kinetic Particle In Cell simulations, we investigate the stability and performance of autoresonant plasma beat wave excitation in plasmas with tailored density profiles…
Batch Bayesian optimization of attosecond betatron pulses from laser wakefield acceleration
Dominika Maslarova, Albert Hansson, Mufei Luo +4
Laser wakefield acceleration can generate a femtosecond-scale broadband X-ray betatron radiation pulse from electrons accelerated by an intense laser pulse in a plasma. The microme…
Data-driven multi-species heat flux closures for two-stream-unstable plasmas with nonlinear sparse regression
Emil R. Ingelsten, Madox C. McGrae-Menge, E. Paulo Alves +1
The dual aims of accuracy and computational efficiency in computational plasma physics lend themselves well to the use of fluid models. The first of these goals, however, is only s…