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Title: Research and applications of radio - frequency deflecting cavities
Authors: Petronio, Marco
Supervisor/Tutor: Vescovo, Roberto
Co-supervisor: Craievich, Paolo
Issue Date: 31-Mar-2011
Publisher: Universit√† degli studi di Trieste
Abstract: This thesis has the aim of describing the design and the applications of the radio-frequency deflecting cavities. These devices are used to analyze the properties of the ultra-relativistic electron bunches in the FERMI@Elettra project, which is a fourth generation light source under development at the Elettra laboratory. In particular, two travelling wave deflectors will be placed just before the undulators chains, where the free electron laser occurs, while another standing wave deflector has been already installed in the first part of the machine, after the first bunch compressor. In this work the radio-frequency design of the low energy deflector is presented with the electron bunch measurements. The measurements have been performed to investigate the bunch length, the reconstruction of the longitudinal profile and the slice emittance. Furthermore the radio-frequency design of the high energy deflectors is discussed, and a new simple theory which allows the explanation of the energy exchange degradation between the electromagnetic field and the particles is given. The theory is useful to describe the mechanical errors in the deflector basic cell realization. In the last part of this thesis a new algorithm to determine the transversal bunch motion in presence of wakefields in a radio-frequency deflector is presented. The algorithm is used to evaluate the wakefield effect in the high energy deflectors and gives the possibility of taking easily in account of every charge distribution, and of every initial condition of the bunch at the input section of the cavity. In particular, the errors produced by the transversal wakefields in a bunch length measurement is analyzed with significant examples.
PhD cycle: XXIII Ciclo
Description: 2009/2010
Keywords: deflector
Main language of document: en
Type: Tesi di dottorato
Doctoral Thesis
Scientific-educational field: ING-INF/02 CAMPI ELETTROMAGNETICI
NBN: urn:nbn:it:units-8996
Appears in Collections:Ingegneria industriale e dell'informazione

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