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The Temperature in the RTP Tokamak Under Feedback Control by Regulating the Output of a 110-GHz Gyrotron

Jaap Lok, Ronald Dam, Bart de Groot

Fusion Science and Technology / Volume 38 / Number 2 / September 2000 / Pages 173-179

Technical Paper /

In addition to wave properties like polarization, harmonic number, high- or low-field side launching, and launch angle, absorption of electron cyclotron waves depends strongly on plasma parameters, such as the temperature. Therefore, we have introduced a new way of operating our 110-GHz gyrotron for electron cyclotron heating and electron cyclotron current-drive experiments. In the Rijnhuizen Tokamak Project (RTP), a system for feedback control of the plasma temperature by regulating the output of the gyrotron has come into operation recently. Other parameters, i.e., the Shafranov parameter = pol + li/2 - 1, and the loop voltage can be under feedback control as well. The control system is described and some test results are given.

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