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Tesi etd-09292006-114554

Thesis type
Tesi di laurea specialistica
Bressi, Erminia
email address
Lattice design for ILC Compton Ring
Corso di studi
Relatore Guiducci, Susanna
Relatore Prof. Cervelli, Franco
Parole chiave
  • ILC
  • Compton Ring
Data inizio appello
Riassunto analitico
The scientific community is going to face a new challenge that will engage Asia, Europe and USA: <br>the International Linear Accelerator (ILC).<br> ILC will explore the TeV energy scale by means of electron-positron collisions.<br>The clean signatures<br>and the precise measurements, available at a high-luminosity linear collider with<br>known and tunable beam energy, could bring revolutionary new insights into <br>the fundamental interaction physics.<br>Several studies have shown the physical importance of the beam polarization at ILC.<br>A polarized electron beam<br>would provide a valuable tool for accurate tests of the Standard Model and for<br>diagnosing new physics.<br>This explains why polarization of the electron beam is already foreseen for the ILC baseline design.<br>However, recently, it has been shown that only if the positron beam is also polarized<br> it will be possible to <br>exploit the full potential of the Linear Collider.<br>In this thesis a design is proposed for a polarized positron source<br>at the ILC. <br>In the first chapter an overview of <br>the physical importance to have both the beams polarized at the interaction point<br>is presented.<br>In the second chapter the two present ideas to obtain polarized positrons<br>are discussed:<br>the undulator-based positron source and the Compton (laser-based) source.<br>In both schemes circularly polarized photons are produced and then converted <br>into polarized positrons in a relatively thin target.<br>In this thesis the Compton scheme proposal has been considered in detail. The main element <br>of the Compton scheme is the so called Compton Ring, that is an electron storage ring <br>where the Compton interaction between the electron beam and a laser produces circularly polarized photons.<br>The original contribution of this thesis is a proposal of a specific Compton Ring lattice, <br>that I have designed using the MAD simulation program. <br>Such design is presented in the third and fourth chapters.<br>In the last chapter one describes a <br>simulation program that devoted to<br>study the longitudinal single bunch dynamics when perturbed <br>by a laser beam. This program has been used to test<br>the lattice models presented in the previous chapters, so allowing <br>to understand the main characteristics of the beam dynamics in a Compton Ring. <br><br>