2013-09-20

# Noise reduction strategies for particle in cell simulations of tokamaks and stellarators

## Prof. Dr. Eric Sonnendrücker, Max-Planck-Institut für Plasmaphysik, Garching

13 Jan 2014, 16:15–17:45; Location: S2|17-103

Simulation of micro-turbulence in magnetic fusion plasmas either in stellarators or in tokamaks can be realised efficiently with Particle In Cell methods (PIC) provided some efficient noise reduction is achieved so that noise levels are well below signal levels. This can be achieved using a control variate method using a stochastic process associated with the Maxwellian equilibrium of the plasma, which is never very far from the actual distribution function. Specific problems arise in this method when diffusive collisions are added in the model.

After a short description of the physics of interest, we will show present our interpretation of noise reduction in PIC simulation and how it can also effectively be used with a weakly collisional model.

Category: CE Seminar