The paper treats the methodology of the design and analysis of a tokamak plasma magnetic cascade multiloop
control system with the example of the Globus-M spherical tokamak (Ioffe Institute, S-Petersburg, Russia)
including a set of new features. The methodology covers: plasma equilibrium reconstruction based on the
experimental data, derivation of linear plasma models relative to the reconstructed plasma equilibrium taking
into account plasma diagnostics methods and equipment, development of a new original model of a thyristor
current inverter as an actuator included in the system feedback, original multivariable cascade multiloop
structure analysis by Relative Gain Array/μ-procedures, and design of an H∞, multivariable plasma shape
control system with adaptation of the magnetic axis position.