Speaker
Maksim Dubrov
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1073.pdf
Modeling of plasma position and shape control during termination of
T-15 discharges
M.L. Dubrov1, R.R. Khayrutdinov1, V.E. Lukash1, M.M. Sokolov1
1
National Research Centre «Kurchatov Institute», Moscow, Russia
The aim of the work is to simulate the magnetic control of the plasma position and shape of
the T-15 tokamak currently being modernized [1] at the current ramp down stage using the
plasma-physical code DINA [2] and the developed regulators [3]. At the stage of the current
ramp down, additional heating is turned off, the temperature and density of the plasma drop
rapidly. This leads to abrupt changes in the values of βp, li, q95 [4], which directly affects the
stability of the plasma and the possibility of its stabilization by the magnetic control system.
During the whole period of current ramp down, the plasma should be in a limited region on
the diagram li - q95 [5] to avoid the development of instabilities and disruption, and maintain
the divertor configuration to the minimum values of the plasma current. Several discharge
termination scenarios that satisfy these criteria and take into account the actual characteristics
of the poloidal magnetic field coil supplies are simulated in the work. The results of the
simulation are used to determine the maximum achievable current ramp down rate in the T-15
tokamak.
References
1. Azizov E.A. et al. Status of project of engineering-physical tokamak. — In: 23rd IAEA Fusion Energy
Conf. Daejeon, Republic of Korea, 11—16 October 2010, FTP/P6-01.
2. R.R. Khayrutdinov and V.E. Lukash. Journal of Computational Physics, 109, No. 2 (1993) 193-201.
3. M.L. Dubrov et al. Modeling control of diverted plasma of the T-15 tokamak, 44th Conference on
Plasma Physics, Belfast, Northern Ireland (UK), 26—30 June 2017, P4.154.
4. P.C. de Vries et al. Multi-machine analysis of termination scenarios with comparison to simulations
of controlled shutdown of ITER discharges, Nucl. Fusion 58 (2018) 026019
5. J. Wesson et al. Nucl. Fusion 29 (1989) 641
