In modern vertically elongated tokamaks it is
critically important to maintain plasma near the first wall at the
diverter phase of a plasma scenario. The reason for this is to
allow plasma equilibrium reconstruction in real time, based on
the external magnetic measurements of the plasma. This paper
suggests a simulation approach to obtain plasma position,
current, and shape control, with a plasma equilibrium
reconstruction code used in feedback. The new basic idea of
such a simulation is to combine scenario signals with the data
coming from the linear model based on tokamak experimental
data. This sum comes to the reconstruction code, which
reconstructs the separatrix location and gaps between the
tokamak first wall and the separatrix itself. Using the example
of the functioning spherical tokamak Globus-M (Ioffe Institute,
S-Petersburg, Russia), we show the results of simulation of
plasma gaps in a closed-loop control system with an original H∞
LPV plasma shape controller at upper X-point of the plasma
magnetic configuration. The simulation approach may be
applied to any tokamak elongated in the vertical direction to
adjust plasma shape control systems before application in
experiments.