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A general magnetic multipole, i.e. a superimposed quadrupole,
hexapole and octopole, is defined by the command:
9 M(AGNETIC) M(ULTIPOLE)
<effective length 
of multipole in meter>
<BQ in T at pole tip>
<BH in T at pole tip>
<BO in T at pole tip>
<BD in T at pole tip>
<BZ in T at pole tip>
<aperture radius G0 in meter> ;
[example: M M 0.2 1.0 0 0 0 0 0.2 ;]
BQ, BH, BO, BD and BZ here are the quadrupole-, hexapole-,
octopole-, decapole- and dodecapole-components
of the magnetic flux density. For positive or negative values of
BQ, BH, BO, BD and BZ particles with positive x-values
are driven
towards or away from the optic axis, respectively.
This multipole-command
is also applicable for a pure quadrupole, hexapole, octopole, decapole or
dodecapol. However, to save computer time, it is advisable to use
in such cases the following commands:
KPII
1999-10-20