Summary of the Workshop on Siberian Snakes and Depolarizing Resonances Correcting Techniques
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Siberian Snake for the Cooler Synchrotron Cosy
Siberian snakes avoid crossing depolarizing resonances in circular accelerators by forcing the spin tune to half integer independent of beam energy. This concept has been proposed by Ya.S. Derbenev and A.M. Kondratenko in 1974 [1]. If only one Siberian snake is used, the invariant spin axis1 is in the horizontal plane. This is an interesting feature to deliver longitudinally polarized beam to i...
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Recent polarized proton beam experiments in the IUCF Cooler Ring found an evidence for a second-order snake depolarizing resonance, when the vertical betatron tune was inadvertently set near a quarter-integer. We have also studied the possibility of spin-flipping the beam polarization in the presence of a full Siberian snake using an rf solenoid. By varying the rf solenoid’s ramp time and frequ...
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Here, and in a sequel, we invoke the invariant spin field to provide an in–depth study of spin motion at and near low order orbital resonances in a simple model for the effects of vertical betatron motion in a storage ring with Siberian Snakes. This leads to a clear understanding, within the model, of the behaviour of the beam polarisation at and near so–called snake resonances in proton storag...
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We began studying Siberian Snakes at the 1985 Ann Arbor Workshop on Polarized Protons at the SSC l . Fig. 1 is a diagram of how a polarized SSC might appear with Siberian Snakes installed in the various rings. By the end of the Workshop it appeared that it would be practical to have polarized protons at the SSC, but only if the Siberian Snake Concept worked as everyone hoped. The Workshop's fir...
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We overcame the strong Gy = -3+vy intrinsic depolarizing resonance using a Siberian Snake acting on a stored beam of 177 MeV polarized protons at the Indiana University Cooler Ring. We also saw the first evidence for a synchrotron depolarizing resonance in a proton ring. Two synchrotron resonances were studied by varying the rf accelerating voltage and the imperfectio~i field at 104 MeV. The Si...
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