Multi-variable feed-back control of plasma current and horizontal positionin HT-7 super-conductive tokamak

In the analysis of HT-7 superconductive tokamak which consists of iron core , thick copper shell and multi-coupling coils system, the electromagnetic p arameters are linearized by a novel method; the copper shell is replaced by an equivalent pair of coil in series-opposing; and the multi-coupling is c ompensated by an intermediate state variable. As a result, the plasma contr ol equation can be set up and solved more simply and easily. The feed-back control system has been designed and rather good results were obtained in e xperiment. This feed-back control system has high response speed, less comp uting time and is easy to carry out.