E-Locus - Ιδρυματικό Καταθετήριο Πανεπιστημίου Κρήτης - Numerical models and interplay of intrabeam scattering with incoherent effects for high brightness circular accelerators

Αρχική Numerical models and interplay of intrabeam scattering with incoherent effects for high brightness circular accelerators

Αποτελέσματα - Λεπτομέρειες

[Προσθήκη στο καλάθι]

Κωδικός Πόρου

000468796

Τίτλος

Numerical models and interplay of intrabeam scattering with incoherent effects for high brightness circular accelerators

Άλλος τίτλος

Αριθμητικά μοντέλα και αλληλεπίδραση των ενδοδεσμικών σκεδάσεων με μη συνεκτικά φαινόμενα για κυκλικούς επιταχυντές υψηλής φωτεινότητας

Συγγραφέας

Ζαμπετάκης, Μιχαήλ Κ

Σύμβουλος διατριβής

Τσιρώνης, Γεώργιος
Bartosik, Hannes
Papafilippou, Yannis

Μέλος κριτικής επιτροπής

Μακρής, Κωνσταντίνος
Κυρίτσης, Ηλίας
Νιάρχος, Βασίλειος
Κομίνης, Ιωάννης

Περίληψη

Circular accelerators require high beam brightness, often limited by collective effects like space charge (SC) and intrabeam scattering (IBS), which degrade beam quality even with synchrotron radiation (SR) damping. To optimize performance, it is crucial to study SC, IBS, and SR effects in simulations, including lattice nonlinearities. To this end, numerical models for simulating IBS in rings operating both below and above transition, along with a simple model for SR damping, have been implemented in the PyORBIT tracking code, complementing its existing SC module. These models were validated against analytical predictions, showing excellent agreement. This thesis explores the interplay of SC, IBS, and SR in two types of machines: the Compact Linear Collider (CLIC) damping rings (DRs) using electrons, and CERN’s ion injectors, specifically the Super Proton Synchrotron (SPS) and Low Energy Ion Ring (LEIR) with lead ions. In the CLIC DRs, SC, IBS, and SR effects near betatron resonances were evaluated. SR damping was found to reduce adverse IBS and SC impacts on beam parameters. Dynamic simulations of the CLIC DR cycle highlight that selecting the optimal working point is critical to manage the transition from lattice-driven to space-charge-driven detuning, preventing losses and emittance growth near resonances. In LEIR and SPS, experimental beam behavior could not be fully captured by SC or IBS simulations alone. To resolve this, combined SC and IBS simulations were performed for LEIR under controlled resonance, aligning well with machine measurements. Similarly, for the first time, combined simulations successfully explained SPS beam observations. These findings underscore the importance of a combined approach for accurately modeling beam dynamics in high- performance accelerators.

Φυσική περιγραφή

xxix, 145 σ. : πίν., σχήμ., εικ. (μερ. εγχρ.) ; 30 εκ.

Γλώσσα

Αγγλικά

Θέμα

CERN

Incoherent effects

Particle accelerator

Resonance

Space charge

Synchrotron radiation

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