Computer Science – Sound
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1069..283j&link_type=abstract
THEORY OF FUSION PLASMAS. AIP Conference Proceedings, Volume 1069, pp. 283-288 (2008).
Computer Science
Sound
Plasma Simulation, Plasma Heating By Radio-Frequency Fields, Icr, Icp, Helicons, Interaction Of Fluid Motion And Sound, Doppler Effect, And Sound In Flow Ducts
Scientific paper
In order to numerically study the effects of Ion Cyclotron Resonant Heating (ICRH) on the fast particle distribution function in general plasma geometries, three codes have been coupled: VMEC[1] generates a general (2D or 3D) MHD equilibrium including full shaping and pressure anisotropy. This equilibrium is then mapped into Boozer coordinates. The full-wave code LEMan[2], [3] then calculates the power deposition and electromagnetic field strength of a wave field generated by a chosen antenna using a warm model. Finally, the single particle Hamiltonian code VENUS [4, 5] combines the outputs of the two previous codes in order to calculate the evolution of the distribution function. Within VENUS, Monte Carlo operators for Coulomb collisions of the fast particles with the background plasma have been implemented, accounting for pitch angle and energy scattering. Also, ICRH is simulated using Monte Carlo operators on the Doppler shifted resonant layer. The latter operators act in velocity space and induce a change of perpendicular and parallel velocity depending on the electric field strength and the corresponding wave vector. Eventually, the change in the distribution function will then be fed into VMEC for generating a new equilibrium and thus a self-consistent solution can be found. This model is an enhancement of previous studies in that it is able to include full 3D effects such as magnetic ripple, treat the effects of non-zero orbit width consistently and include the generation and effects of pressure anisotropy. Here, first results of coupling the three codes will be shown in 2D tokamak geometries.
Brunner Stephan
Cooper Alfred W.
Graves J. P.
Jucker M.
Mellet N.
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