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SUMMARY:David Nunn (Southampton)
DESCRIPTION:We use a simulation algorithm for collision free plasma termed 
 the Vlasov method of kinetic phase point trajectories  (Kazeminezhad et a
 l\, Phys Rev\, 2003) also known as Vlasov Hybrid Simulation (Nunn\, 1990\,
  CPC). The method is simplicity itself. In the chosen phase space simulati
 on box particles are followed continuously forwards in time\, just as in P
 IC codes. However\, applying Liouville’s theorem\, we actually know the 
 distribution function (F) at the phase points occupied by the particles. I
 t only remains to INTERPOLATE F from particles to phase space grid\, whenc
 e integration over V space enables the plasma charge/current field to be c
 alculated. Armed with this and Maxwell’s equations the electromagnetic f
 ield may be pushed.\nThe method is stable\, easily programmed\, robust aga
 inst filamentation of F\, and does not invoke unphysical smoothing of F. L
 ike all Vlasov methods it is low noise compared to PIC\, and has a large a
 dvantage over PIC in that the simulation can be confined to limited region
 s of velocity space.\nThe technique is here applied to the simulation of V
 LF chorus generation\, and is able to reproduce many phenomena in the VLF 
 band\, such as triggering of risers\, fallers and hooks\, chorus like wave
 forms\, resonant sideband generation and so forth. Simple 1D electrostatic
  code has been written as a further demonstrator of the method and its acc
 urate calculation of F. 
URL:https://www.imperial.ac.uk/events/101545/david-nunn-southampton/
DTSTART;TZID=Europe/London:20170126T140000
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LOCATION:United Kingdom
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