EFDA-JET-CP(09)06/12

Tokamak Plasma Inductance Control at JET

Plasma inductance control is an essential profile control tool for tokamaks that can be used to extend pulse duration, access to advanced regimes, reduce vertical instability growth rate, and improve experiment reproducibility. To better understand the inductance control problem, we derive a lumped parameter model that approximates a process that is inherently a distributed parameter system. This model is then used to design an inductance control system, and its performance studied with simulations. Experiments done at JET in support of the controller have help to identify some of the issues regarding the use of boundary flux as actuator. Inductance control with neutral beams has been achieved with different degree of efficiency. Plasma inductance control is an essential profile control tool for tokamaks that can be used to extend pulse duration, access to advanced regimes, reduce vertical instability growth rate, and improve experiment reproducibility. To better understand the inductance control problem, we derive a lumped parameter model that approximates a process that is inherently a distributed parameter system. This model is then used to design an inductance control system, and its performance studied with simulations. Experiments done at JET in support of the controller have help to identify some of the issues regarding the use of boundary flux as actuator. Inductance control with neutral beams has been achieved with different degree of efficiency.
Name Size  
EFDC090612 1.17 Mb