In order to carry out electron scattering experiments with longitudinally p
olarized electrons, a 'Siberian Snake' comprising superconducting solenoids
and skew quadrupoles was installed in the 900 MeV electron storage ring 'A
mPS'. In this paper the basic optics of this novel design is discussed and
first experimental results are reported. (C) 1999 Elsevier Science B.V. All
rights reserved.