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Two Beam Test Stand Experiments in the CTF3 Facility
CEA/DSM/IRFU Saclay, France.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. (Accelerator Physics)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2011 (English)Conference paper (Refereed)
Abstract [en]

The CLEX building in the CTF3 facility is the placewhere essential experiments are performed to validate theTwo-Beam Acceleration scheme upon which the CLICproject relies. The Drive Beam enters the CLEX hall afterbeing recombined in the Delay loop and the CombinerRing in intense beam trains of 24 A – 120 MeV lasting140 ns and bunched at 12 GHz, although other beamparameters are also accessible. This beam is thendecelerated in dedicated structures installed in the TestBeam Line (TBL) and in the Two-Beam Test Stand(TBTS) aimed at delivering bursts of 12 GHz RF power.In the TBTS this power is used to generate a highaccelerating gradient of 100 MV/m in specially designedaccelerating structures. To assess the performances ofthese structures a probe beam is used, produced by asecond Linac. We report here various experimentsconducted in the TBTS making use of the versatility ofthe probe beam and of dedicated diagnostics.

Place, publisher, year, edition, pages
National Category
Accelerator Physics and Instrumentation
URN: urn:nbn:se:uu:diva-170216OAI: oai:DiVA.org:uu-170216DiVA: diva2:508610
IPAC2011, San Sebastián, Spain
Available from: 2012-03-09 Created: 2012-03-09 Last updated: 2014-01-23
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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1096
National Category
Subatomic Physics
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)
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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