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Commissioning
=============

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.

<a href="http://golem.fjfi.cvut.cz/operation/shots/29984/"><img src="http://golem.fjfi.cvut.cz/operation/shots/29984/basicdiagn/graphic.png" /></a><br/>
<a href="http://golem.fjfi.cvut.cz/operation/shots/29986/"><img src="http://golem.fjfi.cvut.cz/operation/shots/29986/basicdiagn/graphic.png" /></a>




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.