BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:A Critical Look at Quasilinear Theory - Patrick Diamond (Universit
 y of California\, San Diego)
DTSTART:20240514T103000Z
DTEND:20240514T113000Z
UID:TALK216874@talks.cam.ac.uk
DESCRIPTION:Quasilinear theory and methods have been invoked frequently du
 ring the ADIProgram. Quasilinear theory\, including its foundations\, vali
 dity\, applications andevolution\, have been studied intensively in plasma
  physics since the pioneeringcontributions of Sagdeev et al. in the early 
 1960s. This body of work merits somediscussion. Here\, we present a critic
 al analysis of quasilinear theory\, primarily in thecontext of the Vlasov-
 Poisson system. This system describes the Hamilton evolution ofthe (phase 
 space) distribution function in a 2D phase space\, and thus is structurall
 ysimilar to the oft-discussed system which describes potential vorticity e
 volution on abeta plane.This talk will address the foundations and validit
 y of quasilinear theory and willdiscuss some of the challenges to it. Spec
 ial attention is focused on the effects of modecoupling &mdash\; or equiva
 lently\, phase space density granulations\, akin to &ldquo\;eddys&rdquo\;.
  Theimplications of the traveling wave tube experiment of Tsunoda et al. a
 re discussed indetail. We also take a look at more recent work on related 
 energetic particle phenomenaand (magnetically) trapped particle-driven dri
 ft wave turbulence.If this talk is successful\, all parties with a vested 
 interest in the matter ofquasilinear theory (either for or against) should
  depart at least somewhat unhappy.
LOCATION:Seminar Room 2\, Newton Institute
END:VEVENT
END:VCALENDAR