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Commissioning
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Interesting data were acquired by osciloscope B.
1. Signla from puff generator
2. amplified signal (voltage on a valve)
3. pressure by vacuum gauge
4. trigger
Firstly, we searched for a suitable tokamak mode. We had problems with U_loop signal mixed in pressure signal. Our prefered mode was with CD delayed.
- U_bt = 1300 V
- U_cd = 600 V, 20 ms delayed
With this delay, the plasma started when the toroidal magnetic field reached its maximum.
Plasma instabilities in later phase of a discharge occured, probably due to fading toroidal magnetic field.
Control shot of our configuration: [http://golem.fjfi.cvut.cz/shots/29977//]
For our initial experimints, we used single puff pulse: 5 ms long, amplitude over 70 V triggered at 20 ms.
Shot without the puff [http://golem.fjfi.cvut.cz/shots/29984//](http://golem.fjfi.cvut.cz/shots/29984)
Shot with the puff [http://golem.fjfi.cvut.cz/shots/29986//]
By optical comparison of these shots we see, that was the plasma was affected by the puff.