Microwave Analysis of the Damped Detuned Accelerator Structure*

Damped and detuned accelerating structures (DDS), designed to minimize the effects of long range wakefields excited by bunchtrains, are presently under investigations at SLAC. We report the first studies of beam-induced microwave signals in a prototype DDS. The DDS is a 206 cell, nearly constant gradient structure, employing Gaussian detuning, and four symmetrically placed waveguide manifolds to damp the first-band dipole modes. We describe the manifold and output coupler design, bench measurements, and measurements with beam during the ASSET experiment. Dipole mode signals have been used to steer the beam to the structure center and minimize the wakefield kick. 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. M I C R O W A V E A N A L Y S I S O F THE DAMPED DETUNED ACCELERATOR STRUCTURE M. Seidel, C. Adolphsen, W. R. Fowkes, S. M. Hanna, H. A. Hoag, R. Jones†, K. Ko, N. Kroll†, R. J. Loewen, R. H. Miller, C. Pearson, R. D. Ruth, J. W. Wang, and D. H. Whittum Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309 USA †University of California, San Diego, La Jolla, CA 92093-0319