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Measurements of the longitudinal coupling impedences using short electron bunch

By A.V. ALEKSANDROV, M.S. AVILOV, N.S. DIKANSKY, P.V. LOGACHOV, A.V. NOVOKHATSKY, B.A. SKARBO, V. GUIDI, P. LENISA, G. CIULLO, G. LAMANNA, B. YANG and L. TECCHIO

Abstract

The longitudinal coupling impedance in modern storage rings has to be limited to ensure beam stability. To de- termine the real part of the narrow band impedance we suggest to measure the loss factor of the resonant modes using short electron bunch passing through the tested el- ement. This method is also suitable for the measurement of the longitudinal impedances for nonrelativistic particles, that is important for some modern projects of ion storage rings designed to achieve ordered structure in the ion beam. The desired value of relativistic parameter gamma can be chosen by adjusting energy of the electron bunch. The impedance of the fundamental mode of the wall current monitor was measured using 60 ps electron bunch from photogun. The dependence of impedance on beam energy is measured in the range 25-50 kV . Comparison of experimental data with computer simulation is done

Publisher: Institute of Physics Publishing
Year: 1996
OAI identifier: oai:iris.unife.it:11392/497897
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