MEASUREMENTS OF THE IMPEDANCE INTRODUCED BY THE VERTICAL SCRAPER AT ELETTRA AND ITS EFFECTS

Noticeable excitations of particular narrow band longitudinal coupled multibunch instabilities as a function of the position of the blades of the scraper have been observed. In order to achieve a deeper insight of the phenomenon and in particular that of an eventual crosstalk between the scraper and the RF cavities via the beam, an exhaustive characterization of both the longitudinal and transverse impedances of the scraper has been carried out.

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