Va. Anferov et Ra. Phelps, SPIN-TRANSPARENT INTERACTION REGIONS FOR HERA, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 398(2-3), 1997, pp. 423-425
Special spin rotators are proposed for compensating the spin perturbat
ion in vertical and horizontal bends around the interaction regions in
the 820 GeV HERA proton ring. Installing a radial snake on each side
of the interaction region would allow to have a spin-transparent inter
action region.