Topic/Type: 1.2 Fusion Plasmas (magnetic & inertial confinement), Poster

### Sawtooth oscillations in presence of arbitrary plasma flow

Madhurjya P Bora1, Samiran Chatterjee1, Debasis Chandra2, Abhijit Sen2

1 Physics Department, Gauhati University, Guwahati 781014, India
2 Institute for Plasma Research (IPR), Bhat, Gandhinagar 382428, India

Sawtooth oscillations of are believed to be the result of $\small (m=1,n=1)$, internal resistive kink mode in current carrying plasmas, where the central temperature of the plasma linearly increases followed by a sudden drop (the crash), which indicates the re-arrangement of the magnetic flux surfaces (reconnection). However, the actual physics of these fundamental oscillations are far from being completely understood as the popular perception of these oscillations, which requires, complete reconnection (Kadmotsev\'s Model) is found to be invalid. We are reporting the results of pseduo-spectral, multi-cpu simulation of the sawtooth oscillations in current carrying plasmas which is modeled through a set of generalized MHD equations (GRMHD) [1]. These equations allow systematic inclusion of arbitrary plasma flow. In this paper, we have carried out nonlinear simulation of these oscillations in presence of arbitrary plasma flow.