TJ-II:Gas puff

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At TJ-II, the working gas is puffed using a set of 8 piezoelectric valves, driven by a preprogrammed voltage signal. The aperture time and the desired density inside the vacuum vessel define the signal profile. This density depends in a complex way on the voltage applied to the valve and the accumulated effect of consecutive inlets during a shot. An VME waveform generator module generates the output signal. A graphical user interface has been developed based on JAVA; all system parameters can be fully configured using Internet applet viewers. [1]

References

  1. L. Pacios et al, Gas inlet control system for the stellarator TJ-II, Proc. 11th IEEE NPSS conf. (1999) 243 - 245