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BEGIN:VEVENT
DTSTAMP:20260427T162657Z
DTSTART;VALUE=DATE-TIME:20160509T150000
DTEND;VALUE=DATE-TIME:20160509T160000
SUMMARY:Samuel Irvine & Bernard Reman
TZID:Europe/London
UID:20160509-094d434553342af1015337f465b53d29@warwick.ac.uk
CREATED:20160302T153117Z
DESCRIPTION:Samuel Irvine: 'Nonlinear self-consistent kinetic simulations
  of the anomalous Doppler instability' The anomalous Doppler instability
  is a key relaxation mechanism for suprathermal electron populations in 
 magnetic confinement plasmas. The underlying physics of this instability
  involves a shift from parallel to perpendicular electron motion\, accom
 panied by the excitation of waves at frequency and wavenumber satisfying
  the anomalous Doppler resonance condition. The relevance of this effect
  in magnetic confinement plasmas is becoming increasingly apparent as di
 agnostics with improved time resolution are deployed. We use first princ
 iple particle in cell simulations to demonstrate the significance of thi
 s effect on fast kinetic timescales showing the existence of both a wave
 -wave anomalous Doppler effect as well as a secondary instability due to
  the resultant positive slope in the parallel electron distribution func
 tion. Bernard Reman: 'Modelling ICE (ion cyclotron emission) via hybrid 
 simulation of the MCI (Magneto acoustic Cyclotron Instability)' Abstract
 : Suprathermal ion cyclotron emission (ICE) is detected from all large t
 oroidal magnetic confinement fusion (MCF) plasmas\, both tokamak and ste
 llarator. Its frequency spectrum has narrow peaks at sequential cyclotro
 n harmonics of the energetic ions at the outer midplane edge of the plas
 ma. ICE was the first collective radiative instability driven by confine
 d fusion-born ions observed in deuterium-tritium (D-T) plasmas in JET an
 d TFTR\, and the magnetoacoustic cyclotron instability (MCI) is the most
  likely emission mechanism. For a recent review\, see R O Dendy and K G 
 McClements\, Plasma Phys. Control. Fusion 57 044002 (2015). ICE is propo
 sed as a diagnostic for confined energetic ions in ITER\; see K G McClem
 ents\, R d’Inca et al.\, Nucl. Fusion 55 043013 (2015). Second generatio
 n ICE measurements are now being taken from the LHD stellarator and from
  the conventional aspect ratio KSTAR tokamak\, and are imminent for the 
 QUEST spherical tokamak. These measurements are taken at sampling rates 
 far higher than for first generation ICE\, in combination with multiple 
 other advanced diagnostics. This enables fresh insights into the physics
  of confined energetic ions in MCF plasmas\, and also into the interacti
 on between these ions and MHD activity. Exploitation of second generatio
 n ICE measurements requires a corresponding advanced modelling capabilit
 y for the emission mechanism\, the MCI. Here we report MCI studies using
  a 1D3V hybrid code (L Carbajal et al.\, Phys. Plasmas 21 012106 (2014))
  which simulates the selfconsistent full gyro-orbit kinetics of energeti
 c and thermal ions\, the electric and magnetic fields\, and a massless n
 eutralising electron fluid. We focus on the sub-Alfvénic regime of the M
 CI\, for plasma conditions appropriate to ICE measurements associated wi
 th neutral beam injected ions in LHD. For the first time\, we are able t
 o follow the sub-Alfvénic MCI into the nonlinear saturated regime\, ther
 eby strengthening the link to measured LHD ICE spectra.'
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20160506T094416Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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