In this study, two adjacent sextants were partially cut from one side
of a sextupole magnet in order to accommodate the electron beam bendin
g chamber associated with a three x-ray beam dine chamber. The yoke cu
tting of these two sextants creates a different magnetic circuit which
induces several forbidden fields. Meanwhile, the fundamental strength
of this magnetic circuit is less than that of the normal on cut sextu
pole magnets in the storage ring. An induced forbidden field and the l
essened sextupole strength originated from the saturation effect occur
ring at the magnet's yoke cutting side. Therefore, an extra closed-loo
p magnetic circuit is added across the two adjacent sextants to compen
sate for the yoke's smaller core area. This extra magnetic circuit can
eliminate the saturation effect which induces asymmetric field behavi
or. It can also compensate for the lessened sextupole strength. In thi
s work, the field distribution for various excitation currents related
to the three magnetic circuits were measured. The field measurement r
esults with various excitation currents tell us that the field saturat
ion phenomena create the asymmetry field, forbidden field, and the les
sened sextupole strength of the yoke cut magnetic circuit.