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80
7060
50
Tz 40
S 30
20
-
- ~1.5kV
-- V = 200kV
-
V = 250kV
-- E,,, = 41.13kV/cmi
10
10
10
-6
10-5
10-4
po in C/rn 3
(a) Maximum electric field.
70
60
-
50
40
-p
-T
3020r
10
10
10
10
6
po in
10
C/rn 3
(b) Minimum electric field.
Figure 4-7: Maximum and minimum electric field strength on emitter surface as a
function of charge density.
55