Touschek Lifetime Studies and Optimization of the European Synchrotron Radiation Facility: Present and Upgrade Lattice

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Springer, Dec 28, 2015 - Science - 102 pages

This thesis describes the experimental and theoretical basics of free electron laser science, serving as an excellent introduction for newcomers to this young field. Beyond that, it addresses electron-beam lifetimes in third-generation synchrotron light sources, in particular with a view to optimizing them in the forthcoming ESRF upgrade.

The lifetime of the electron beam in a storage ring is a measure of how fast electrons are being lost, and is thus an essential parameter determining the required injection frequency, which in turn affects beam stability and power consumption. The main limitation on the beam lifetime in these synchrotron light sources is the Touschek effect, i.e. the single scattering between two electrons in a bunch. In this thesis a model able to predict the Touschek lifetime is presented. The model is successfully tested against measurements and used to study the influence of other parameters such as current and size of vacuum chamber. Not least, it enables the settings of sextupole magnets to be optimized.

 

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Contents

1 Introduction to Synchrotron Radiation and the ESRF
1
2 Touschek Effect in Electron Storage Rings
9
3 Touschek Lifetime Parameters Measurements
19
4 Lifetime Measurements
42
5 Optimization and Testing of Alternate Sextupole Setting
53
6 Bunch Lengthening and Intrabeam Scattering for the ESRF Low Emittance Upgrade Lattice
61
7 Touschek Lifetime for the New Lattice
67
Conclusions
72
Appendix A Overview of Beam Physics in Electron Storage Rings
75
Appendix B Spin Depolarization Code
91
Appendix C Momentum Compaction Factor Measurements
97
Appendix D Dynamic Aperture with Synchrotron Oscillations
99
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