Book/Dissertation / PhD Thesis

PUBDB-2025-00559

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Optics measurement and correctionfor future electron circular colliders

Musa, E. S. H. (Corresponding author)DESY* ; Hillert, W. (Thesis advisor)CFEL*Extern* ; Agapov, I. (Thesis advisor)DESY*

2024
Verlag Deutsches Elektronen-Synchrotron DESY Hamburg

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Please use a persistent id in citations: urn:nbn:de:gbv:18-ediss-124512  doi:10.3204/PUBDB-2025-00559

Report No.: DESY-THESIS-2025-001

Abstract: The development of ultra-low emittance storage rings, such as the e+/e- Future CircularCollider (FCC-ee) with a circumference of about 90 km, aims to achieve unprecedentedluminosity and beam size. One significant challenge is correcting the optics, which becomesincreasingly difficult as we target lower emittances. The use of stronger quadrupolesand sextupoles makes these machines particularly sensitive to misalignments, which canseverely impact performance. This study investigates optics correction methods to addressthese challenges. We examined the impact of arc and Interaction Region (IR) magnetalignment errors in two optics design options for the FCC-ee, called Baseline and LocalChromatic Correction Optics (LCCO). To establish realistic alignment tolerances, we developeda sequence of correction steps using the Python Accelerator Toolbox (PyAT) tocorrect the lattice optics, achieve nominal emittance, and large Dynamic Aperture (DA).We focused initially on the Linear Optics from Closed Orbit (LOCO) method, which fitsthe measured Orbit Response Matrix (ORM) to the lattice model to determine optimalparameters such as quadrupole strengths. We implemented a Python-based numerical codefor LOCO correction and evaluated its effectiveness for the FCC-ee. Preliminary resultsindicate successful optics corrections. We also compared LOCO with phase advance +ηx and coupling Resonance Driving Terms (RDTs) + ηy optics correction, finding thatthe latter performed better in achieving design emittance values and a large DA area forrealistic alignment tolerances, for the studied cases. The code was further optimized andexpanded to include more realistic scenarios. Additionally, we applied LOCO to PETRAIV -a fourth generation light source upgrade, and integrated the code into the PythonSimulated Commissioning toolkit for Synchrotrons (PySC).v

Note: Dissertation, Universität Hamburg, 2024

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Contributing Institute(s):

1. Beschleunigerphysik (MPY)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. PHGS, VH-GS-500 - PIER Helmholtz Graduate School (2015_IFV-VH-GS-500) (2015_IFV-VH-GS-500)

Experiment(s):

1. Future Circular Collider

Appears in the scientific report 2024

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