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Gradient-based optimization of 3D MHD equilibria
Elizabeth Paul, Matt Landreman, Thomas Antonsen
Using recently developed adjoint methods for computing the shape derivatives of functions that depend on MHD equilibria (Antonsen et al. 2019; Paul et al. 2020), we present the fir…
Adjoint approach to calculating shape gradients for three-dimensional magnetic confinement equilibria. Part II: Applications
Elizabeth J. Paul, Thomas Antonsen, Matt Landreman +1
The shape gradient is a local sensitivity function that provides the change in a figure of merit associated with a perturbation to the shape of the object. The shape gradient can b…
Multi-Stream Instability of a Single Long Electron Bunch in a Storage Ring
B. L. Beaudoin, R. A. Kishek, I. Haber +2
A multi-stream instability is observed experimentally in a longitudinally expanding electron beam in a storage ring. The instability is observed when the beam expands such that its…
Adjoint approach to calculating shape gradients for 3D magnetic confinement equilibria
Thomas Antonsen, Elizabeth J. Paul, Matt Landreman
The shape gradient quantifies the change in some figure of merit resulting from differential perturbations to a shape. Shape gradients can be applied to gradient-based optimization…
High-Power Tunable Laser Driven THz Generation in Corrugated Plasma Waveguides
Chenlong Miao, John P. Palastro, Thomas M. Antonsen
The excitation of THz radiation by the interaction of an ultra short laser pulse with the modes of a miniature corrugated plasma waveguide is considered. The axially corrugated wav…
Stagnation of electron flow by a nonlinearly generated whistler wave
Toshihiro Taguchi, Thomas M. Antonsen, Kunioki Mima
Relativistic electron beam transport through a high-density, magnetized plasma is studied numerically and theoretically. An electron beam injected into a cold plasma excites Weibel…