Abstract
The Pumped Divertor phase of JET involves the use of plasma configurations with complex control requirements. Therefore a new Plasma Position and Current Control system (PPCC) has been developed. It consists of two separate subsystems: Vertical Stabilisation (VS) and plasma Shape and Current Control (SC). SC performs a real time calculation of the plasma boundary using the Xloc algorithm [1]. It uses a full multivariable decoupling control algorithm which is applied to a combination of plasma wall-gaps and currents directly controlled [2]. SC and VS were brought into operation during the past months. The paper describes the operation of the system and reports on the performances achieved during the 1994 campaign.
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