Physics Department Seminar University of Alaska Fairbanks

J O U R N A L    C L U B


An orange or a carrot?: Quantifying local blob dynamics from NSTX 2010 GPI data

Douglas Ogata
Physics Department/GI, UAF



Work done at Princeton Plasma Physics Laboratory (PPPL) in investigating local edge turbulence will be presented. Blob diffusion has been quantified using the D-alpha light intensity signal from GPI diagnostic on NSTX. In the moving reference frame of a blob, and assuming a general non-diffusive formulation, blob spreading can be best fitted to the diffusive model. From this, the spreading of an individual blob can then be quantified in terms of a spreading coefficient, which is analogous to a diffusion coefficient. Blobs in H-mode and Ohmic plasmas near the separatrix show distinguishing spreading coefficients. This segregation can be used to characterize blobs in different regimes and as a quantitative measure of the local dynamics for blobs across machines and between experiments and simulations.


Friday, 4 March 2016

Globe Room, Elvey Building

3:45 PM