Plasma Physics Seminar ( Phys 769)

Dr. Jan Weiland, Chalmers University/Euratom Predictive Simulations of Spontaneous Rotation in JET Spontaneous rotation has been obsreved in tokamaks both in the toroidal and poloidal directions. We have simulated both types and have found that spontaneous rotation in the poloidal direction occurs only in internal transport barrier while spontaneous toroidal rotation is likely to occur in systems without strong beam drive of toroidal momentum. The poloidal spinup is due to the perpendicular drifts in the Reynolds stress while the toroidal spontaneous rotation is associated with toroidal effects entering the parallel momentum balance through the stress tensor. Both cases are sensitive to the fluid closure through the fluid resonances. Reasonably good agreement with experiment is obtained in these quite demanding simulations. Return to main page