<div class="csl-bib-body">
<div class="csl-entry">Doblhammer, A. (2018). <i>Beam emittance preservation and tuning in the FCC-ee lepton collider</i> [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2018.33711</div>
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dc.identifier.uri
https://doi.org/10.34726/hss.2018.33711
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/6166
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dc.description
Abweichender Titel nach Übersetzung der Verfasserin/des Verfassers
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dc.description.abstract
Following the recommendations of the European Strategy Group for High Energy Physics, CERN launched the Future Circular Collider Study (FCC) to investigate the feasibility of large-scale circular colliders for future high energy physics research. In the electron-positron collider of the study, FCC-ee, large synchrotron radiation losses cause the beam to have large local deviations from the design energy. These energy deviations cause orbit offsets and create the so-called sawtooth effect, which causes particles to pass the magnets of the accelerator off-centre. This in turn causes perturbing magnetic fields via the feed-down effect. In order to correct the sawtooth effect and therefore the feed-down effect, the dipole magnets in the machine can be adjusted to the local beam energy in a process called dipole tapering. In the course of this thesis, different dipole magnet tapering scenarios are compared in terms of their effectiveness, feasibility and cost. Furthermore, this thesis focuses on tuning the horizontal beam emittance using wigglers. A small value of the beam emittance corresponds to a small beam cross-section, resulting in an increased likelihood of particle collisions and thus a higher luminosity. However, a number of perturbations can cause the beam emittance to deviate from its design value. In order to restore the design emittance, wigglers are implemented in the accelerator lattice. Different wiggler designs will be presented for both decreasing and increasing the value of the horizontal beam emittance. It will be shown, that an emittance decrease and increase by a factor of 10 % with an acceptable increase in synchrotron radiation is possible. The last section of this thesis focuses on chromaticity correction in FCC- ee and its influence on the beam emittance. Chromaticity correction schemes with varying numbers of sextupole families are implemented into the FCC-ee lattice. Sextupole strengths are optimized using a downhill simplex algorithm in order to reduce chromaticities up to the fourthorder. Finally, emittance calculations after the application of each correction scheme show, that chromaticity correction schemes can have a significant influence on the beam emittance, which should be considered in the design of these correction schemes.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
Lepton Kollisionsbeschleuniger
de
dc.subject
Beschleunigerdesign
de
dc.subject
Emittanz
de
dc.subject
Synchrotronstrahlung
de
dc.subject
Lepton collider
en
dc.subject
lattice design
en
dc.subject
emittance
en
dc.subject
synchrotron radiation
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dc.title
Beam emittance preservation and tuning in the FCC-ee lepton collider
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dc.title.alternative
Strahlemittanzkontrolle für den FCC-ee Lepton Kollisionsbeschleuniger
de
dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.identifier.doi
10.34726/hss.2018.33711
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dc.contributor.affiliation
TU Wien, Österreich
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dc.rights.holder
Andreas Doblhammer
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dc.publisher.place
Wien
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tuw.version
vor
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tuw.thesisinformation
Technische Universität Wien
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dc.contributor.assistant
Benedikt, Michael
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tuw.publication.orgunit
E141 - Atominstitut
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dc.type.qualificationlevel
Diploma
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dc.identifier.libraryid
AC15022930
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dc.description.numberOfPages
78
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dc.identifier.urn
urn:nbn:at:at-ubtuw:1-112062
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dc.thesistype
Diplomarbeit
de
dc.thesistype
Diploma Thesis
en
dc.rights.identifier
In Copyright
en
dc.rights.identifier
Urheberrechtsschutz
de
tuw.advisor.staffStatus
staff
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tuw.assistant.staffStatus
staff
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item.fulltext
with Fulltext
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item.cerifentitytype
Publications
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item.mimetype
application/pdf
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item.openairecristype
http://purl.org/coar/resource_type/c_bdcc
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item.languageiso639-1
en
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item.openaccessfulltext
Open Access
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item.openairetype
master thesis
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item.grantfulltext
open
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crisitem.author.dept
E141-04 - Forschungsbereich Neutron- and Quantum Physics