Beam Diagnostics in Superconducting Accelerating Cavities
The Extraction of Transverse Beam Position from Beam-Excited Higher Order Modes
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Beschreibung
This work employs self-excited wakefields as a diagnostic to remotely determine the beam position within a superconducting cavity and chains thereof. Several numerical techniques are delineated in order to ascertain the most appropriate technique in terms of reliability and accuracy. The methodology is carefully explained making the presentation pedagogically appropriate to students new to the field as well as researchers familiar with this topic. Pei Zhang's achievements will serve as a basis for the development of similar monitors at various other facilities around the world.
An energetic charged particle beam introduced to an rf cavity excites a wakefield therein. This wakefield can be decomposed into a series of higher order modes and multipoles, which for sufficiently small beam offsets are dominated by the dipole component. This work focuses on using these dipole modes to detect the beam position in third harmonic superconducting S-band cavities for light source applications. A rigorous examination of several means of analysing the beam position based on signals radiated to higher order modes ports is presented. Experimental results indicate a position resolution, based on this technique, of 20 microns over a complete module of 4 cavities. Methods are also indicated for improving the resolution and for applying this method to other cavity configurations. This work is distinguished by its clarity and potential for application to several other international facilities. The material is presented in a didactic style and is recommended both for students new to the field, and for scientists well-versed in the field of rf diagnostics.
Nominated as an outstanding Ph.D. thesis by the Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany The author is the winner of the 2011 European Accelerator Prize for promising young researchers A valuable didactic introduction for students and scientists new to the field of rf diagnostics Provides a detailed survey of various dimension reduction methods applicable for rf diagnostics Includes supplementary material: sn.pub/extras
Autor*in
Pei Zhang
Themen in »Beam Diagnostics in Superconducting Accelerating Cavities«
Beam Optimization at DESY Beam Position Diagnostics Beam Position Extraction Charged Particle Beams Decomposition Higher Order Wakefield Mode RF Beam Diagnostics Simulating Higher Order Cavity Modes Spectrum Analysis by K-means Clustering Spectrum Analysis by Linear Regression Spectrum Analysis by Singular Value Superconducting Accelerating Cavity