Compact Plasma and Focused Ion Beams

66 Compact Plasma and Focused Ion Beams

The electron motion in this case is strongly affected by the magnetostatic

eld, and when the electron–cyclotron frequency equals the wave frequency,

resonant transfer of energy occurs from the EM electric eld to the electrons,

accelerating the electrons to high velocities and hence bringing about the

onset of discharge much earlier in time.

Four cases of B

0

are studied, namely, 500 G (below resonance), 875.5 G (at

resonance), 1000 G (above resonance), and 875.5 G with E ‖ B

0

. Figure 4.9

shows the N versus

Λ

/

λ

for the four cases at E

0

= 10 kV/m. Another plot for

875.5 G (resonance) at 30 kV/m is also shown ...