Research on Burn Control of Core Plasma with the Transport Code

Abstract

For the fusion reactors or experimental devices, one will be required to control several plasma parameters, like the fusion power, the heat flux, the neutron flux, the beta-value and so on. To control these parameters, many diagnostics and actuators are needed, but the diagnostics and actuators available in DEMO/commercial reactors are limited because of the high heat or neutron flux. For these reasons, to realize the fusion reactors, the construction of the reactor control logic is required. We are developing the burn control logic in the core plasma with a 1.5D transport code, and discussing on the relationship between control parameters and actuators. To demonstrate the feasibility of the core plasma control, we have demonstrated the simultaneous control of the fusion power and the safety factor profile with the gas-puff and NBI.

Multi-Input Multi-Output (MIMO) Control System with a State Equation for Fusion Reactors

“…In contrast, if we want to control fusion power and the qmin value with NBI and gas puffing, then a complicated control logic must be introduced because the two actuators simultaneously affect both fusion power and q min . We have endeavored to perform a multiple control simulation by using a 1.5D transport code [7]. In the simulation, we succeeded in control-ling two parameters using PID theory in which the PID gains were determined from the output characterization.…”

“…However, for MIMO systems, it is difficult to determine PID gains. For example, in SISO systems, three gain parameters are sufficient for the P, I, and D terms, while in a 2 × 2 MIMO system [6,7], twelve (= 4 × 3), PID gains must be determined because four gain parameters in the 2 × 2 control matrix must be known for each P, I, and D term. It is hard to determine twelve PID gains from only an output characterization.…”