Emittance Dilution Due to Slow Alignment Drifts in the Main Linacs of the Nlc

The tight tolerances in the main linacs of the Next Linear Collider (NLC) result in a large sensitivity of the beam emittance to slow alignment drifts. Once the accelerator is tuned, the optimized emittances must be maintained. Slow alignment drifts will make resteering and reoptimization necessary. The frequency of these linac reoptimizations is an important parameter that determines how well the linear collider can be operated. We present simulation results that address this question for the main linacs of the NLC. We will show that the e ects of alignment drifts can indeed be handled. Presented at the XVIII International Linac Conference (LINAC 96), Geneva, Switzerland, August 26-30, 1996 Work supported by Department of Energy contract DE{AC03{76SF00515. EMITTANCE DILUTION DUE TO SLOW ALIGNMENT DRIFTS IN THE MAIN LINACS OF THE NLC R. Assmann, C. Adolphsen, K. Bane, T.O. Raubenheimer, K. Thompson Stanford Linear Accelerator Center, Stanford, CA 94309, USA