3D simulation studies of the two-stream instability in intense particle beams based on the Vlasov-Maxwell equations

This article extends previous numerical studies of the stability properties of intense nonneutral charged particle beams with large temperature anisotropy (T⊥b >> T∥b) to allow for nonaxisymmetric perturbations with ∂/∂θ ≠ 0. The most unstable modes are identified, and their eigenfrequencies, radial mode structure, and nonlinear dynamics are determined.

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Nonlinear perturbative particle simulation studies of the electron-proton two-stream instability in high intensity proton beams

Physical Review Special Topics - Accelerators and Beams ◽

10.1103/physrevstab.6.014401 ◽

2003 ◽

Vol 6 (1) ◽

Cited By ~ 30

Author(s):

Hong Qin ◽

Edward A. Startsev ◽

Ronald C. Davidson

Keyword(s):

High Intensity ◽

Particle Simulation ◽

Simulation Studies ◽

Proton Beams ◽

Stream Instability

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Magnetic resonance imaging and 3D simulation studies of biofilm accumulation and cleaning on reverse osmosis membranes

Food and Bioproducts Processing ◽

10.1016/j.fbp.2010.08.010 ◽

2010 ◽

Vol 88 (4) ◽

pp. 401-408 ◽

Cited By ~ 30

Author(s):

S.A. Creber ◽

T.R.R. Pintelon ◽

D.A.W. Graf von der Schulenburg ◽

J.S. Vrouwenvelder ◽

M.C.M. van Loosdrecht ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Reverse Osmosis ◽

3D Simulation ◽

Simulation Studies ◽

Resonance Imaging ◽

Reverse Osmosis Membranes

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Accelerated particle beams in a 3D simulation of the quiet Sun

Astronomy and Astrophysics ◽

10.1051/0004-6361/202038529 ◽

2020 ◽

Vol 643 ◽

pp. A27

Author(s):

L. Frogner ◽

B. V. Gudiksen ◽

H. Bakke

Keyword(s):

Particle Acceleration ◽

Transition Region ◽

Solar Atmosphere ◽

Energy Transport ◽

Active Regions ◽

3D Simulation ◽

Particle Beams ◽

Local Conditions ◽

Coulomb Collisions ◽

Accelerated Particles

Context. Observational and theoretical evidence suggest that beams of accelerated particles are produced in flaring events of all sizes in the solar atmosphere, from X-class flares to nanoflares. Current models of these types of particles in flaring loops assume an isolated 1D atmosphere. Aims. A more realistic environment for modelling accelerated particles can be provided by 3D radiative magnetohydrodynamics codes. Here, we present a simple model for particle acceleration and propagation in the context of a 3D simulation of the quiet solar atmosphere, spanning from the convection zone to the corona. We then examine the additional transport of energy introduced by the particle beams. Methods. The locations of particle acceleration associated with magnetic reconnection were identified by detecting changes in magnetic topology. At each location, the parameters of the accelerated particle distribution were estimated from local conditions. The particle distributions were then propagated along the magnetic field, and the energy deposition due to Coulomb collisions with the ambient plasma was computed. Results. We find that particle beams originate in extended acceleration regions that are distributed across the corona. Upon reaching the transition region, they converge and produce strands of intense heating that penetrate the chromosphere. Within these strands, beam heating consistently dominates conductive heating below the bottom of the transition region. This indicates that particle beams qualitatively alter the energy transport even outside of active regions.

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