Comparing DINA Code Simulations with TCV Experimental VDE Responses
The DINA free-boundary equilibrium simulation code has been implemented for TCV, including the full TCV feedback and diagnostic systems. First results showed good agreement with control coil perturbations and correctly reproduced certain non-linear features in the experimental measurements. The latest DINA code simulations, presented in this paper, exploit a set of 14 discharges with different cross-sectional shapes (delta) and different vertical instability growth rates of about 200 Tad/ s which were subjected to controlled Vertical Displacement Events (V DE). They were carried out on limited plasmas in the TCV tokamak to validate a deformable plasma model of the vertical instability, extending previous work with the DINA code on the DIII-D tokamak. The height of the TCV vessel allows observation of the non-linear evolution of the V DE growth rate as regions of different vertical field decay index are crossed. This work focuses on the comparison of the most common equilibrium parameters like the vertical position z, the plasma current I(p), the elongation k the triangularity delta and the safety factor q, between the TCV experiments and the DINA simulations. Additionally, the evolution of the growth rate gamma of both DINA and TCV is estimated and compared with the evolution of the closed loop growth rate calculated with the RZIP linear model.
Bibliographic Reference: An oral report given at: The 28th EPS Conference of Controlled Fusion and Plasma Physics. Held in: Madeira (PT) June 2001
Record Number: 200013695 / Last updated on: 2001-09-18
Original language: en
Available languages: en