re 2.78[mm] "Electrode radius"
r0 re/1.147 "Inscribed radius"
rsrc 1[mm] "Source radius"
rcase 4*r0 "Case radius"
a q*eta "Mathieu coefficient"
q 0.7 "Mathieu coefficient"
eta 0.2/0.7 "Slope for the ratio a/q"
f 4[MHz] Frequency
omega 2*pi*f "Angular frequency"
mi 40[amu] "Argon ion mass"
Vac q*mi*omega^2*r0^2/(4*e_const) "AC applied voltage magnitude"
Udc a*mi*omega^2*r0^2/(8*e_const) "DC applied voltage magnitude"