BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Kinetic turbulence: a nonlinear route to dissipation through phase
  space - Schekochihin\, A (Imperial College London)
DTSTART:20081001T093000Z
DTEND:20081001T100000Z
UID:TALK13853@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:This talk will describe a conceptual framework for understandi
 ng kinetic plasma turbulence as a generalized form of energy cascade in ph
 ase space. It is emphasized that conversion of turbulent energy into therm
 odynamic heat is only achievable in the presence of some (possibly arbitra
 rily small) degree of collisionality. The smallness of the collision rate 
 is compensated by the emergence of small-scale structure in the velocity s
 pace. For gyrokinetic turbulence\, a nonlinear perpendicular phase mixing 
 mechanism is identified and described as a turbulent cascade of entropy fl
 uctuations simultaneously occurring in the gyrocentre space and in velocit
 y space. Scaling relations for the corresponding fluctuation spectra are d
 erived. An estimate for the collisional cutoff is provided. The relevance 
 of these results to understanding the dissipation-range turbulence in the 
 solar wind and the electrostatic microturbulence in fusion plasmas is disc
 ussed.\nRelated Links\n    * http://arxiv.org/abs/0806.1069 - preprint
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR