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New automatic control experiments at the Joint European Torus require reliable control of fundamental physics variables such as density, temperature and reaction rate. This is achieved by a set of co-operating digital control systems managing the plasma heating and gas introduction.
An increasing number of diagnostic systems now provide measurements of plasma variables in real time. These are collected and processed by a system called the Signal Server. A selection of these signals are forwarded to the Central Controller which in turn produces actuation requests to a set of five local controllers, each dedicated to a specific plant system.
The Central Controller enables a wide range of control scenarios to be implemented. Each local controller system performs the crucial function of relating the complex non-linear reality of the plant to the simple linear environment of the central controller. All systems are implemented using VME based technology.
The system is fully operational and it is supporting the JET experimental programme. A simple application has been the stabilization of a single variable such as plasma energy or neutron production rate by means of one heating system. More complex, multivariable control applications involving more than one heating system have also been tried successfully. Furthermore, complete management of an experiment has been performed using thresholds on sensitive variables to decide whether to modify or terminate a plasma pulse. e.

Additional information

Authors: KING Q A, JET Joint Undertaking, Abingdon, Oxfordshire (GB);BRELEN H E O,
Bibliographic Reference: Article; An Experimental Automatic Control Facility at JET, JET-P(1998)24, 1-9
Record Number: 199910434 / Last updated on: 1999-03-19
Original language: en
Available languages: en
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