Measurement of low-temperature plasma density with charge collectors

The density and drift velocity of the low-temperature plasma produced by a cable plasma gun array are measured with charge collectors under positive(135 V) and negative bias(-117 V) and low-pressure air-embedment(0.5 Pa) without bias. The drift velocities under different collecting conditions are close to each other, which are 2.5,2.4,2.0 cm·μs-1 respectively. At the same place, the measured plasma densities are 8.3×1014,1.2×1015,4.8×1014 cm-3 respectively. The density is the greatest with negative bias and the smallest with low-pressure air-embedment.