Pre-damping Ring Research Articles

The SNAKE ring a feasibility study of a small predamping ring for the positron source of SLC

In order to reduce the large emittances of the positron beam, as well as the large energy spread, a radiation damping time of the order of 10 ms is required. By use of a specially designed “SNAKE”-wiggler with a field of 2 T one can obtain this short damping time at a beam energy of 100 MeV. Because of the strong bending field of the wiggler, the optics of the small model predamping ring presented here, in particular the chromaticity, is mainly determined by the edge focusing at the entrance and exit of each wiggler section. In order to get a uniform damping partition the dispersion function has to have a particular shape which defines the most important optical constraint.