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BEGIN:VEVENT
DTSTAMP:20260428T221313Z
DTSTART;VALUE=DATE-TIME:20180115T150000
DTEND;VALUE=DATE-TIME:20180115T160000
SUMMARY:Ken McClements (Culham): Particle acceleration during merging-com
 pression plasma start-up in the Mega Amp Spherical Tokamak
TZID:Europe/London
UID:20180115-8a17841b5f2acca4015f52eca4a535d6@warwick.ac.uk
CREATED:20171025T094601Z
DESCRIPTION:Magnetic reconnection occurred during merging-compression pla
 sma start-up in the Mega Amp Spherical Tokamak (MAST)\, resulting in the
  prompt acceleration of substantial numbers of ions and electrons to hig
 hly suprathermal energies. Accelerated field-aligned ions (deuterons and
  protons) were detected using a neutral particle analyser at energies up
  to about 20 keV during merging in early MAST pulses\, while nonthermal 
 electrons have been detected indirectly in more recent pulses through mi
 crowave bursts. However no increase in soft x-ray emission was observed 
 until later in the merging phase\, by which time strong electron heating
  had been detected through Thomson scattering measurements. A test-parti
 cle code CUEBIT has been used to model ion acceleration in the presence 
 of an inductive toroidal electric field with a prescribed spatial profil
 e and temporal evolution based on Hall-MHD simulations of the merging pr
 ocess. The simulations yield particle distributions with properties simi
 lar to those observed experimentally\, including strong field alignment 
 of the fast ions and the acceleration of protons to higher energies than
  deuterons. Particle-in-cell modelling of a plasma containing a dilute f
 ield-aligned suprathermal electron component suggests that at least some
  of the microwave bursts can be attributed to the anomalous Doppler inst
 ability driven by anisotropic fast electrons\, which do not produce meas
 urable enhancements in soft x-ray emission either because they are insuf
 ficiently energetic or because the nonthermal bremsstrahlung emissivity 
 during this phase of the pulse is below the detection threshold. There i
 s no evidence of runaway electron acceleration during merging\, possibly
  due to the presence of three-dimensional field perturbations.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20180108T122148Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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