r_rod 8[mm] "Rod radius"
L_rod 250[mm] "Rod length"
r0 7[mm] "Inner radius of the quadrupole"
r_in 1[mm] "Inlet radius"
r_case 2*(r_rod+r0) "Case radius"
V_AC 125[V] "AC Voltage"
f 500[kHz] "AC frequency"
omega 2*pi*f "Angular frequency"
T_osc 1/f "Time period"
mass_ion 133[amu] "Ion mass"
q_param 4*e_const*Vac/mass_ion/(omega*r0)^2 "Mathieu coefficient (q)"
Pgas 6[Pa] "Buffer gas pressure"
Tgas 273[K] "Buffer gas temperature"
nd Pgas/Tgas/k_B_const "Buffer gas number density"
E_in 60[eV] "Initial kinetic energy"
V1 -10[V] "Trapping potential minimum voltage"
V2 10[V] "Trapping potential maximum voltage"
x_min L_rod/10*9 "Trapping potential minimum location"