Measurement and interpretation of the bunched beam transfer function in SIS-18 with space charge.
Technische Universität, Darmstadt
[Ph.D. Thesis], (2008)
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|Item Type:||Ph.D. Thesis|
|Title:||Measurement and interpretation of the bunched beam transfer function in SIS-18 with space charge|
Longitudinal Beam Transfer Function (BTF) measurements are employed as a diagnostic tool to determine synchrotron frequencies and damping rates in a synchrotron. The BTF method is employed to measure an effective impedance. The aim of our theoretical study was to understand the influence of space charge effects and longitudinal impedances on the BTF. The BTF models developed in this work are based on the linearized Vlasov equation and on the equation of motion for a driven oscillator with damping factor. To verify the theoretical models numerical simulations studies have been performed. For these studies a PIC (particles-in-cell) code has been developed. As part of this work longitudinal BTF measurements using bunched beams were per- formed in the SIS. In the experiment we excited the bunches using rf phase modulation. The longitudinal bunch oscillations were detected as a function of the rf phase modulation frequency. The measurements were done at different beam intensities. For the interpreta- tion of experimental results the theoretical framework developed in this work was used.
|Place of Publication:||Darmstadt|
|Classification DDC:||500 Naturwissenschaften und Mathematik > 530 Physik|
|Divisions:||18 Department of Electrical Engineering and Information Technology|
|Date Deposited:||17 Oct 2008 09:23|
|Last Modified:||07 Dec 2012 11:54|
|Referees:||Weiland, Prof. Dr.- Thomas and Boine-Frankenheim, Prof. Dr. Oliver|
|Refereed:||15 April 2008|