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 The PK-4 prototype mounted vertically at a tiltable table to change the influence of gravity. This prototype features a new tube design and a gas flow control system. |
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 Camera (upper part) and illumination laser (below) are mounted on translation stages |
 Gas control and power supply devices beside the support structure |
 Camera looking into the center of the plasma of the 'positive column' |
 Discharge inside the capillary connection tube towards the vacuum pump |
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