Spectral Content of the NLC Bunch Train due to Long Range Wakefields(LCC-0015)

The functional specifications of the sub-train position feedback for the NLC Main Linac are determined by the expected amplitude and spectrum of distortions to the bunch train, which in turn arise from the long-range wakefields of the rf structures. We describe a method for estimating the amplitude and spectrum of the distortions due to assorted structure misalignments, and apply the method to both tilted structures and structures with a cell-to-cell misalignment determined by a random-walk model. Some implications for the sub-train feedback, such as the required system bandwidth are considered. .. Spectral Content of the NLC Bunch Train due to Long Range Wake elds Peter Tenenbaum LCC-Note-0015 10-May-1999