| NUKLEONIKA 2012, 57(2):297-300
DIAGNOSTICS OF MAGNETIZED LOW TEMPERATURE PLASMA
BY BALL-PEN PROBE
Jiří Adámek1, Matěj Peterka2, Tomaž Gyergyek3, Pavel Kudrna2, Milan Tichý2
1 Institute of Plasma Physics AS CR, v.v.i., 3 Za Slovankou Str., 18200 Prague 8, Czech Republic
2 Faculty of Mathematics and Physics, Charles University in Prague,
3 Ke Karlovu Str., 12116 Prague 2, Czech Republic
3 Faculty of Electrical Engineering, University of Ljubljana,
25 Tržaška Str., 1000 Ljubljana, Slovenia
The ball-pen probe is an innovative electric probe for direct measurements of the plasma potential in magnetized hot plasma. This probe is based on the Katsumata probe concept. The ball-pen probe can adjust the ratio I–saturat/I+saturat of the electron and ion saturation currents to be equal to one and therefore the ball-pen probe characterization becomes symmetric. If this is achieved, the floating potential of the ball-pen probe is equal to the plasma potential in Maxwellian plasma. We show the application of a ball-pen probe in slightly magnetized low temperature plasma.
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