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The CTF3 Two-beam Test Stand
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.
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: 0000-0002-6815-2794
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2013 (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. 729, 546-553 p.Article in journal (Refereed) Published
Abstract [en]

The Two-beam Test Stand (TBTS) has been constructed and operated at the CLIC test facility CTF3 at CERN. The TBTS comprises two parallel and independent electron beam lines and has been designed to demonstrate the feasibility of a two-beam high gradient acceleration concept as proposed for the Compact Linear Collider (CLIC). In the CLIC scheme, the RF power is extracted from a high current drive beam using RF power extraction structures while the main beam is accelerated using this RF power which is fed into high gradient high frequency normal conducting accelerating structures. The Two-beam Test Stand is a unique facility to demonstrate the feasibility of the CLIC two-beam high gradient acceleration concept and to test the individual CLIC components and complete two-beam CLIC modules. The TBTS is particularly well suited to investigate the effects on the beam of RF breakdown in the high gradient accelerating structures. We report on the design, construction and commissioning of the Two-beam Test Stand.

Place, publisher, year, edition, pages
2013. Vol. 729, 546-553 p.
Keyword [en]
Two-beam acceleration, RF breakdown, CLIC, CTF3
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-208218DOI: 10.1016/j.nima.2013.07.055ISI: 000325753500076OAI: oai:DiVA.org:uu-208218DiVA: diva2:651327
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2013-09-25 Created: 2013-09-25 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Beam Momentum Changes due to Discharges in High-gradient Accelerator Structures
Open this publication in new window or tab >>Beam Momentum Changes due to Discharges in High-gradient Accelerator Structures
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The key questions left unanswered by the Standard Model, and the recent discovery of a Standard Model-like Higgs boson, demand an extension of the research on particle physics to the TeV energy scale. The Compact Linear Collider, CLIC, is a candidate project to achieve such goal. It is a linear lepton collider based on a novel two-beam acceleration scheme capable of high-gradient acceleration in X-band accelerator structures. The high electric fields required, however, entail the occurrence of vacuum discharges, or rf breakdowns, a phenomenon whose microscopic dynamics is not yet completely understood, and whose impact on the beam can lead to a severe degradation of the collider luminosity.

The understanding of the physics of rf breakdowns has therefore become a significant issue in the design of a reliable accelerator based on CLIC technology. That is addressed experimentally through the study of accelerator structures performance during high-power operations. We report on such a study carried out on a CLIC prototype structure assembled in a resonant ring at SLAC. We characterise the experimental set-up through a complex least square analysis, and we show how breakdowns can be localised in the structure on the basis of rf measurements.

The same methodology lays the ground for the study of the impact of rf breakdowns on the beam. We addressed that issue at the Two-beam Test Stand, an experimental area built within the CLIC Test Facility CTF3 at CERN, where we tested a CLIC prototype accelerator structure in the presence of an electron beam. There, we found that rf breakdowns can affect both the longitudinal and the transverse beam momentum, causing a reduction of accelerating gradient and transverse kicks to the beam trajectory. In view of the CLIC design, we finally discuss what is the impact of such effects on the collider luminosity, which can be drastically reduced.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 85 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1096
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-208567 (URN)978-91-554-8802-4 (ISBN)
Public defence
2013-12-12, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Funder
Knut and Alice Wallenberg Foundation, 2004-0122Knut and Alice Wallenberg Foundation, 2009-0244Swedish Research Council, 2005-4474Swedish Research Council, 2010-6027Swedish Research Council, 2011-6305Swedish Research Council, 2009-6234EU, FP7, Seventh Framework Programme, 227579
Available from: 2013-11-21 Created: 2013-10-03 Last updated: 2014-01-23

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Ruber, RogerZiemann, VolkerTord, EkelöfPalaia, Andrea

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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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