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Optimum resonance control knobs for sextupoles
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0002-6229-5620
2018 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 894, p. 111-118Article in journal (Refereed) Published
Abstract [en]

We discuss the placement of extra sextupoles in a magnet lattice that allows to correct third-order geometric resonances, driven by the chromaticity-compensating sextupoles, in a way that requires the least excitation of the correction sextupoles. We consider a simplified case, without momentum-dependent effects or other imperfections, where suitably chosen phase advances between the correction sextupoles leads to orthogonal knobs with equal treatment of the different resonance driving terms.

Place, publisher, year, edition, pages
2018. Vol. 894, p. 111-118
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-330972DOI: 10.1016/j.nima.2018.03.041ISI: 000430704600014OAI: oai:DiVA.org:uu-330972DiVA, id: diva2:1147954
Funder
Swedish Research Council, 2011-6305Swedish Research Council, 2014-6360Knut and Alice Wallenberg FoundationAvailable from: 2017-10-09 Created: 2017-10-09 Last updated: 2018-08-03Bibliographically approved
In thesis
1. Beam Diagnostics and Dynamics in Nonlinear Fields
Open this publication in new window or tab >>Beam Diagnostics and Dynamics in Nonlinear Fields
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Particle accelerators are indispensable tools for probing matter at the smallest scales and the improvements of such tools depend on the progress and understanding of accelerator physics. The Compact Linear Collider (CLIC) is a proposed, linear electron–­positron collider on the TeV-scale, based at CERN. In such a large accelerator complex, diagnostics and alignment of the beam are crucial in order to maintain beam quality and luminosity. In this thesis we have utilized the nonlinear fields from the octupole component of the radio-frequency fields in the CLIC accelerating structures for beam-based diagnostics. We have investigated methods where the nonlinear position shifts of the beam are used to measure the strength of the octupole component and can also be used for alignment. Furthermore, from the changes in transverse beam profile, due to the nonlinear octupole field, we determine the full transverse beam matrix, which characterizes the transverse distribution of the beam.

In circular accelerators, nonlinear fields result in nonlinear beam dynamics, which often becomes the limiting factor for long-term stability. In theoretical studies and simulations we investigate optimum configurations for octupole magnets that compensate amplitude-dependent tune-shifts but avoid driving fourth-order resonances and setups of sextupole magnets to control individual resonance driving terms in an optimal way.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. p. 87
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1583
Keywords
Beam diagnostics, Nonlinear beam dynamics, Accelerator physics
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-330975 (URN)978-91-513-0121-1 (ISBN)
Public defence
2017-12-08, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2017-11-15 Created: 2017-10-19 Last updated: 2018-03-07

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Ögren, JimZiemann, Volker

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Accelerator Physics and Instrumentation

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