Fig. 3. Electric field line drawn along the height at the center of the air gap. The surface plane of the collector electrode was 0 mm-high, and the HV plate was 70 mm-high. The thin line indicates the air gap in the width of the collector, and the thick line indicates the air gap in the length of the collector. The ratio (∆w⁄∆l) in Eq. (6) was 2.06.
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