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Beam Diagnostics in Superconducting Accelerating Cavities : the Extraction of Transverse Beam Position from Beam-Excited Higher Order Modes.

Author: Pei Zhang
Publisher: Dordrecht : Springer, 2013.
Series: Springer theses.
Edition/Format:   eBook : Document : EnglishView all editions and formats
Summary:
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  Read more...
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Zhang, Pei.
Beam Diagnostics in Superconducting Accelerating Cavities : The Extraction of Transverse Beam Position from Beam-Excited Higher Order Modes.
Dordrecht : Springer, ©2013
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Pei Zhang
ISBN: 9783319007595 3319007599
OCLC Number: 858763887
Description: 1 online resource (128 pages)
Contents: Supervisors' Foreword; Contents; Abstract; 1 Introduction; 1.1 Free-Electron Laser in Hamburg; 1.2 Third Harmonic Cavities; 1.3 Wakefields; 1.3.1 Electromagnetic Field in a Cavity; 1.3.2 Definitions of RF Parameters; 1.3.3 Definition of Wakefields; References; 2 Electromagnetic Eigenmode Simulations of the Third Harmonic Cavity; 2.1 The Third Harmonic Cavity as a Periodic Structure; 2.2 The Beam Pipe as a Circular Waveguide; 2.3 Eigenmodes of an Ideal Third Harmonic Cavity; References; 3 Measurements of HOM Spectra; 3.1 Transmission Spectra of an Isolated Single Cavity. 3.2 Module-Based Transmission Spectra3.3 Beam-Excited HOM Spectra; References; 4 Analysis Methods for Beam Position Extraction from HOM; 4.1 Data Preparation; 4.2 Direct Linear Regression; 4.3 Singular Value Decomposition; 4.4 k-means Clustering; 4.5 Comparison of DLR, SVD and k-means Clustering; 4.5.1 Fixed Sample Split; 4.5.2 Cross-Validation; References; 5 Dependencies of HOM on Transverse Beam Offsets; 5.1 Measurement Scheme; 5.2 The Localized Dipole Beam-Pipe Modes; 5.3 Trapped Cavity Modes in the Fifth Dipole Band; 5.4 Coupled Cavity Modes in the First and the Second Dipole Band. A.1 Direct Linear RegressionA. 2 Singular Value Decomposition; A.3 Definitions of r2 and barr2; A.4 Definitions of Resolution; B Eigenmodes of an Ideal Third Harmonic Cavity; B.1 List of Eigenmodes; B.2 Electric Field Distributions; B.2.1 Monopole (Electric Boundaries); B.2.2 Monopole (Magnetic Boundaries); B.2.3 Dipole (Electric Boundaries); B.2.4 Dipole (Magnetic Boundaries); C Technical Details of the HOM Measurements; About the Author.
Series Title: Springer theses.

Abstract:

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 resoluti.

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