NLC Collimation Study Update: Performance with Tail Folding Octupoles

This note describes an update to the study of linear collider collimation system performance performed by the collimation task force and presented in [1, 2, 3]. In particular, the performance of the NLC collimation system with the addition of “tail-folding” octupoles is described. These octupoles allow the betatron collimation gaps to be opened by more than a factor of three. We present the optimized gap settings, the location of additional photon masks, and the resulting synchrotron-radiation collimation efficiency. The studies confirm that the tail-folding octupoles are efficient, give additional flexibility, and enhance the collimation system performance. . NLC Collimation Study Update: Performance with Tail Folding Octupoles A. Drozhdin1, L. Keller2, T. Markiewicz2, T. Maruyama2, N. Mokhov1, T. Raubenheimer2, A. Seryi2, P. Tenenbaum2, M. Woodley2, 1Fermilab, Batavia, IL 2SLAC, Stanford, CA