Slow Extraction from KEK-PS Main Ring

Two different schemes are used for the slow beam extraction from the main ring of KEK-PS. One uses the internal target scattering under the non-resonant condition and the other the half-integer resonance at ¿x = 7.5. The extraction efficiency is higher for the resonant extraction (99 %) than for the non-resonant scheme (~30 %). The spill feedback system are provided to suppress the intensity modulation of the extracted beam and to obtain the spill duration up to 400 msec. Slow extraction also shares the beam with the internal target in both schemes in order to perform experiments on both floors at the same time.