Abstract. The gas injection and wall recycling in a tokamak are critical to maintain the plasma on stable
conditions. A new injection system operated with a piezo electric valve is being installed on the tokamak ISTTOK to
achieve precise puffing injections of hydrogen. This redesign is intended primarily to allow long period operation
over 250 ms, for AC operation.
The system should be suitable for feedback control based on a digital signal processor. Real time plasma density
evaluation from the microwave interferometer data provides a good control variable for the process loop.
The major change on the system is the inclusion of one buffer operating at 10-100 mbar, which allows the
reduction of the intake gas pressure during puffing experiments. This new design allows a more precise hydrogen
quantities injection based on the piezo electric open-time and leads to longer and stable plasma shots. text abstract. |
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