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An Electrostatic Multipole

An electrostatic multipole is defined by the command: 9 E(LECTROSTATIC) M(ULTIPOLE) <effective length $\ell$ of multipole in meter> <VQ in kV at electrode> <VH in kV at electrode> <VO in kV at electrode> <VD in kV at electrode> <VZ in kV at electrode> <aperture radius G0 in meter> ; [example: E   M   0.1   1.0   0   0   0   0   0.03 ;]

VQ, VH, VO, VD and VZ here are the quadrupole-, hexapole-, octopole-, decapole- and dodecapole-components of the electrode potential. For positive or negative values of VQ, VH, VO, VD, VZ particles with positive x-values are driven towards or away from the optic axis, respectively.

Analogously to the magnetic case the multipole-command is also applicable for a pure quadrupole, hexapole, octopole, decapole or dodecapole. However, to save computer time it is advisable to use in such cases the following commands:

KPII
1999-10-20