Energy Department

The MHD Control System for the FTU Tokamak

Gabriele D’Antona, Sante Cirant, Mohsen Davoudi

RTC 2010

Energy DepartmentEnergy Department2

Controller MirrorsDrive

Mirrorangles

Reference signal

Plasma

a mirrors

model rdep

model rtarget Equilibrium

CODE

Ray tracingCODE

Btor

Bpol

ne(r)J(r)

ECE

Mirnov

ECRHMod.

Correlation

Correlation

Correlation

Fusion

Assimilation

Assimilation

rdep

rtarget

Assimilation

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Real-time Controller

The objective:To control MHD plasma instabilities in FTU using EC power deposition. This requires:-Mode detection-Mode tracking by EC deposition

Actuators:2 Antennas (each with 3 degree of freedom) and 2 EC Power Gyrotrons

Sensors:

12 ECE, 5 Mirnov coils and 6 encoders for each launcher axis

Energy DepartmentEnergy Department3

Each launcher is moved by three AC brushless motors. The two launchers will scan rDEP in the range 0<rDEP/a<0.75 with an accuracy of 0.5 cm and a dynamical performance of 1 cm to be scanned in 10 ms.

Antennas

The Application

Motors