Compact Plasma and Focused Ion Beams

80 Compact Plasma and Focused Ion Beams

dimensions. For the above cutoff dimension, the experimental prole and

the tting curve are also plotted. The octupole geometry has a atter mini-

mum B eld region than hexapole, and it increases with the increase in

radius of the MC. The magnetic eld in the WGs is measured with a Hall

effect Gaussmeter. The Hall probe is moved in the radial direction in the

central plane of the WGs to map the transverse magnetic eld.

Waveguide Design

Figure 5.5 shows detailed views of the multicusp waveguide MC simi-

lar to the one constructed in reference [17]. Black and white regions rep-

resent north and south poles ...