29 citations · 160 across the 13 of their papers we have counts for
13 papers
Wakefield-driven filamentation of warm beams in plasma
Erwin Walter, John P. Farmer, Martin S. Weidl +2
Charged and quasi-neutral beams propagating through an unmagnetised plasma are subject to numerous collisionless instabilities on the small scale of the plasma skin depth. The elec…
Development of the Self-Modulation Instability of a Relativistic Proton Bunch in Plasma
L. Verra, S. Wyler, T. Nechaeva +7
Self-modulation is a beam-plasma instability that is useful to drive large-amplitude wakefields with bunches much longer than the plasma skin depth. We present experimental results…
Pre-acceleration in the Electron Foreshock II: Oblique Whistler Waves
Paul J. Morris, Artem Bohdan, Martin S. Weidl +3
Thermal electrons have gyroradii many orders of magnitude smaller than the finite width of a shock, thus need to be pre-accelerated before they can cross it and be accelerated by d…
The AWAKE Run 2 programme and beyond
Edda Gschwendtner, Konstantin Lotov, Patric Muggli +99
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. Use of high energy protons to drive wakefields in plasma has been demonstrated…
Pre-acceleration in the Electron Foreshock I: Electron Acoustic Waves
Paul J. Morris, Artem Bohdan, Martin S. Weidl +1
To undergo diffusive shock acceleration, electrons need to be pre-accelerated to increase their energies by several orders of magnitude, else their gyro-radii are smaller than the…
The electron foreshock at high-Mach-number nonrelativistic oblique shocks
Artem Bohdan, Martin S. Weidl, Paul J. Morris +1
In the Universe matter outside of stars and compact objects is mostly composed of collisionless plasma. The interaction of a supersonic plasma flow with an obstacle results in coll…
Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma
L. Verra
A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton bunch can be seeded by the…
Injection tolerances and self-matching in a quasilinear wakefield accelerator
John P. Farmer, Linbo Liang, Rebecca Ramjiawan +4
Particle acceleration in a quasilinear plasma wake provides access to high acceleration gradients while avoiding self-trapping of the background electrons. However, the plasma resp…
On the background-gyroresonant character of the Bell instability
Martin S. Weidl, Dan Winske, Christoph Niemann
We show that the Bell instability, which is widely considered potentially important for cosmic-ray acceleration, is the low-frequency limit of a gyroresonant interaction between th…
How it cramps the flow: three regimes for the saturation of parallel ion-beam instabilities
Martin S. Weidl, Dan Winske, Christoph Niemann
Motivated by recent advances in laboratory experiments on parallel ion-beam instabilities, we present a theoretical framework for and simulations of their evolution towards shock f…
Observations of a Field-Aligned Ion/Ion-Beam Instability in a Magnetized Laboratory Plasma
P. V. Heuer, M. S. Weidl, R. S. Dorst +8
Collisionless coupling between super Alfvénic ions and an ambient plasma parallel to a background magnetic field is mediated by a set of electromagnetic ion/ion-beam instabilities…
Cosmic-ray pitch-angle scattering in imbalanced MHD turbulence simulations
Martin S. Weidl, Frank Jenko, Bogdan Teaca +1
Pitch-angle scattering rates for cosmic-ray particles in magnetohydrodynamic (MHD) simulations with imbalanced turbulence are calculated for fully evolving electromagnetic turbulen…
Acceleration of Particles in Imbalanced Magnetohydrodynamic Turbulence
Bogdan Teaca, Martin S. Weidl, Frank Jenko +1
The present work investigates the acceleration of test particles in balanced and imbalanced Alfvénic turbulence, relevant to the solar-wind problem. These turbulent states, obtaine…