Diii-d Integrated Plasma Control Tools Applied to next Generation Tokamaks

A complete software suite for integrated tokamak plasma control has been developed within the DIII-D program. The suite consists of software for real-time control of all aspects of the plasma, modeling, simulation and design tools for analysis and development of controllers, a flexible and modular architecture for implementation and testing of algorithms and many fully validated models. Many elements of the system have been applied to and implemented on NSTX and MAST. The DIII-D realtime plasma control system together with the integrated modeling and simulation suite have been selected for operational use by both the KSTAR and EAST tokamaks, and are also being used at General Atomics to investigate control issues for ITER. 1.!!Introduction The DIII-D Plasma Control System (PCS) [1,2] has evolved to satisfy expanding DIII-D requirements for over a decade, is now operating at both NSTX [3] and MAST [4], and is being adapted for use by KSTAR [7] and EAST [8]. A parallel modeling/simulation effort [5,6] is integrated with this environment and the combination provides a framework for development, validation and implementation of algorithms for tokamak plasma control. The functional layout of the overall architecture is shown in Figure 1. Plasma control during experimental operations is provided by a multi-CPU computer running the PCS software (1A!2A). For “hardware-in-loop” simulations, switch S1 can be set to allow the PCS hardware to drive a model based Simulation Server (SimServer) (1A!2B). For complete software simulation of the PCS and tokamak, essential for new tokamaks like KSTAR, EAST and ITER, a closed loop simulation including a software version of the PCS (1B ! 2B) is used. This software version of the PCS contains the same user interface and data storage (MDSplus) as is normally used for tokamak operation and allows for complete off-line simulation of the tokamak, including post processing of shot data using conventional plasma diagnostic programs like EFIT [9]. The PCS software contains all control laws required for plasma operation, including the isoflux and real-time EFIT shape reconstruction algorithims [10]. DIII-D INTEGRATED PLASMA CONTROL TOOLS J.A. Leuer, et al. APPLIED TO NEXT GENERATION TOKAMAKS 2 GENERAL ATOMICS REPORT A24776 Plasma Control System Multi CPU's