P. TENENBAUM, K. BANE, R.K. JOBE, D. MCCORMICK, T.O. RAUBENHEIMER, M. ROSS, G. STUPAKOV, D. WALZ (SLAC)
We present a direct measurement of the short-range wakefield of a series of tapered collimators. The wakefields were measured by inserting a fixed aperture in the path of the electron beam at the 1.19 GeV point of the SLAC linac. As the vertical position of the collimator is varied, the vertical deflection of the beam is measured on 32 downstream beam position monitors. A series of apertures with different geometries were studied to permit confirmation of the scaling laws and magnitude of deflection predicted by theory. The apparatus is described along with the collimator aperture specifications. The measured centroid deflections are compared with predictions.
* Work supported by the U.S. Department of Energy, Contact Number DE-AC03-76SF00515
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