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Measuring the full transverse beam matrix using a single octupole
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
CERN, CH-1211 Geneva 23, Switzerland; CEA, IRFU, Ctr Etud Saclay, F-91191 Gif Sur Yvette, France.
2015 (engelsk)Inngår i: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 18, nr 7, artikkel-id 072801Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We propose a method to fully determine the transverse beam matrix using a simple setup consisting of two steering magnets, an octupole field and a screen. This works in principle for any multipole field, i.e., sextupole, octupole magnet or a radio frequency structure with a multipole field. We have experimentally verified the method at the Compact Linear Collider Test Facility 3 at CERN using a Compact Linear Collider accelerating structure, which has an octupole component of the radio frequency fields. By observing the position shifts of the beam centroid together with changes in transverse beam size on a screen, we determined the full transverse beam matrix, with all correlations.

sted, utgiver, år, opplag, sider
2015. Vol. 18, nr 7, artikkel-id 072801
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-259088DOI: 10.1103/PhysRevSTAB.18.072801ISI: 000357647600001OAI: oai:DiVA.org:uu-259088DiVA, id: diva2:843513
Forskningsfinansiär
Knut and Alice Wallenberg FoundationSwedish Research Council, 2011-6305, 2014-6360Tilgjengelig fra: 2015-07-29 Laget: 2015-07-27 Sist oppdatert: 2017-12-04bibliografisk kontrollert
Inngår i avhandling
1. Beam Diagnostics and Dynamics in Nonlinear Fields
Åpne denne publikasjonen i ny fane eller vindu >>Beam Diagnostics and Dynamics in Nonlinear Fields
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2017. s. 87
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1583
Emneord
Beam diagnostics, Nonlinear beam dynamics, Accelerator physics
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-330975 (URN)978-91-513-0121-1 (ISBN)
Disputas
2017-12-08, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2017-11-15 Laget: 2017-10-19 Sist oppdatert: 2019-04-24

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