probe the spatial potential could be measured at a further position than 2.3 mm apart from the insulator surface. Observation on Model Surface Below —1.5 kV array potential the luminosity on the insulator surface was observed as seen in Fig. 13, which was the edge model at the airplane mode. It was striped and extended from the electrode on the insulator surface depending on the bias voltage. At the lower potential frequent discharge occurred. 6. Discussion Similarity Law In order to verify the similarity law the ion current characteristics for the baseline and the small models are reconstructed as a function of the CL parameter in Fig. 14, which contains the data of 2 cm and 4.4 cm as LK, No from 2.4 X 109 cm-3 to 1.7 X 1010 cm-3 and K, from 30 eV to 40 eV. The ion current is normalized by the unbiased ram current. All data lie down on the unique curve at the respective modes so that the validity of the similarity law is proved. In addition, the numerical code [6] describes
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