rings. The energy is constrained by the required rotation of We describe a possible replacenaent for the SLC damp-tile electron polarization before injection into the ring, the ing rings that would generate beams with normalized imri-damping times are needed to damp the injected enfittances zontal emittances of'_q-= 9 x 10-6 m-rad when uncoupled; while operating at. 120 Hz, and /.he circumference is deterthis is more than three times smaller than tllat generated mined by' the size of the damping ring vaults. Thus, thore by the current rings. The primary difference between the are only three possible ways of reducing the emit.lances: (1) new design and the current ring is the arc cell structure; the use damping wigglers to decrease both the damping times insertion regions, the kickers, and the RF are essentially and the emittances, (2) use combined function bending unchanged. The new cell uses a single combined rune-magnets to change the horizontal damping partition, also tion bending magnet, roughly 70 cna in length, to replace decreasing the damping times and the emittances, and (3) the two bends, defocusing quadrupole, and defocusing sex-use a more efficient, cell structure with smaller dispersion tupoles in the current FODO cell; the focusing quadrupole to reduce the quantum excitation and thus the emittance. and sextupoles, used in the current cell, are also used in Unfortunately, wigglers are not very effective at rethe new structure. The length of the new cell is identical ducing the emittance. Roughly four meters of 5T superto that of the current cell and thus nine of these new cells conducting wiggler with a 15 cm period would be needed would simply replace the nine FODO cells in each arc of to reduce the damping time and emittance by a factor of lhc rings, two. In addition to the severe operational difficulties with such a device, tile wigglers would incre_e the longitudinal ' "
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