  Programmable control of the inductive electric field enables advanced
operations of reversed-field pinch (RFP) plasmas in the Madison Symmetric Torus
(MST) device and further develops the technical basis for ohmically heated
fusion RFP plasmas. MST's poloidal and toroidal magnetic fields ($B_\text{p}$
and $B_\text{t}$) can be sourced by programmable power supplies (PPSs) based on
integrated-gate bipolar transistors (IGBT). In order to provide real-time
simultaneous control of both $B_\text{p}$ and $B_\text{t}$ circuits, a
time-independent integrated model is developed. The actuators considered for
the control are the $B_\text{p}$ and $B_\text{t}$ primary currents produced by
the PPSs. The control system goal will be tracking two particular demand
quantities that can be measured at the plasma surface ($r=a$): the plasma
current, $I_\text{p} \sim B_\text{p}(a)$, and the RFP reversal parameter,
$F\sim B_\text{t}(a)/\Phi$, where $\Phi$ is the toroidal flux in the plasma.
The edge safety factor, $q(a)\propto B_t(a)$, tends to track $F$ but not
identically. To understand the responses of $I_\text{p}$ and $F$ to the
actuators and to enable systematic design of control algorithms, dedicated
experiments are run in which the actuators are modulated, and a linearized
dynamic data-driven model is generated using a system identification method. We
perform a series of initial real-time experiments to test the designed feedback
controllers and validate the derived model predictions. The feedback
controllers show systematic improvements over simpler feedforward controllers.
