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Design and test of RF shielding for beam impedance reduction in CERN accelerators

2023-11-06Master thesis Open access
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informáticapt_PT
dc.contributor.advisorFernandes, Telmo Rui Carvalhinho Cunha
dc.contributor.authorSantos, Miguel Valente dos
dc.date.accessioned2024-05-24T13:13:36Z
dc.date.available2024-05-24T13:13:36Z
dc.date.issued2023-11-06
dc.description.abstractCERN, the European Organization for Nuclear Research, is one of the world’s largest laboratories for high-energy particle physics. At CERN, particle accelerators and detectors are used to study the basic constituents of matter. CERN’s flagship accelerator is the Large Hadron Collider (LHC), the most powerful particle accelerator built up to now. However, it would not work without its accelerator injector chain. This chain starts with LINAC4, followed by PSB, PS, and SPS, which inject into the LHC. Relatively new particle accelerators like the LHC were designed from scratch with a limited overall beam coupling impedance budget in mind, but this was not the case for the older accelerators at CERN, designed and built decades ago and originally intended for much lower beam intensities. Currently, one of the limiting factors to increase the beam intensities is instabilities caused by the beam coupling impedance of the older accelerators in the chain, such as the PS. The PS vacuum manifolds were identified as one source of instabilities due to a high beam coupling impedance. The current impedance contribution of the manifolds was simulated and measured. Several possible shielding solutions, aimed at reducing the beam coupling impedance, were studied and simulated, giving promising results. Routine RF measurements of other components of the accelerator were performed, either to complete the accelerator impedance contribution database or to assess whether or not the installed shielding is effective. During one of these measurements, it was found that a spare PS septa magnet had defective RF fingers, and the shielding was not effective.pt_PT
dc.identifier.tid203611233pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.8/9686
dc.language.isoengpt_PT
dc.subjectSimulação eletromagnéticapt_PT
dc.subjectAceleradores de partículaspt_PT
dc.subjectBeam coupling Impedancept_PT
dc.subjectMedições RFpt_PT
dc.titleDesign and test of RF shielding for beam impedance reduction in CERN acceleratorspt_PT
dc.typemaster thesis
dspace.entity.typePublication
rcaap.rightsopenAccesspt_PT
rcaap.typemasterThesispt_PT
thesis.degree.nameMestrado em Engenharia Electrotécnicapt_PT

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