001636865 001__ 1636865
001636865 005__ 20241025033921.0
001636865 0248_ $$aoai:cds.cern.ch:1636865$$pINIS$$pcerncds:CERN:FULLTEXT$$pcerncds:THESES$$pcerncds:FULLTEXT$$pcerncds:CERN
001636865 035__ $$9Inspire$$a1296926
001636865 037__ $$aCERN-THESIS-2013-227
001636865 041__ $$aeng
001636865 088__ $$aCLIC-Note-1022
001636865 084__ $$2CERN Library$$aCLIC-Note-1022
001636865 100__ $$aPalaia, Andrea$$uUppsala U.
001636865 245__ $$aBeam Momentum Changes due to Discharges in High-gradient Accelerator Structures
001636865 260__ $$aUppsala$$bActa Universitatis Upsaliensis$$c2013-11-21
001636865 300__ $$a84 p
001636865 502__ $$aPhD$$bUppsala U.$$c2013-11-21
001636865 500__ $$aPresented 12 Dec 2013
001636865 520__ $$aThe key questions left unanswered by the Standard Model, and the recent discovery of a Standard Model-like Higgs boson, demand an extension of the research on particle physics to the TeV energy scale. The Compact Linear Collider, CLIC, is a candidate project to achieve such goal. It is a linear lepton collider based on a novel two-beam acceleration scheme capable of high-gradient acceleration in X-band accelerator structures. The high electric fields required, however, entail the occurrence of vacuum discharges, or rf breakdowns, a phenomenon whose microscopic dynamics is not yet completely understood, and whose impact on the beam can lead to a severe degradation of the collider luminosity. The understanding of the physics of rf breakdowns has therefore become a significant issue in the design of a reliable accelerator based on CLIC technology. That is addressed experimentally through the study of accelerator structures performance during high-power operations. We report on such a study carried out on a CLIC prototype structure assembled in a resonant ring at SLAC. We characterise the experimental set-up through a complex least square analysis, and we show how breakdowns can be localised in the structure on the basis of rf measurements. The same methodology lays the ground for the study of the impact of rf breakdowns on the beam. We addressed that issue at the Two-beam Test Stand, an experimental area built within the CLIC Test Facility CTF3 at CERN, where we tested a CLIC prototype accelerator structure in the presence of an electron beam. There, we found that rf breakdowns can affect both the longitudinal and the transverse beam momentum, causing a reduction of accelerating gradient and transverse kicks to the beam trajectory. In view of the CLIC design, we finally discuss what is the impact of such effects on the collider luminosity, which can be drastically reduced.
001636865 595__ $$aCERN EDS
001636865 595__ $$zCLAS1
001636865 595__ $$aCLIC-Note
001636865 595__ $$aCLICARCHIVE
001636865 65017 $$2SzGeCERN$$aAccelerators and Storage Rings
001636865 693__ $$aCLIC$$eCTF3
001636865 693__ $$sCLIC
001636865 690C_ $$aCERN
001636865 690C_ $$aTHESIS
001636865 701__ $$aZiemann, Volker$$edir.
001636865 701__ $$aRuber, Roger$$edir.
001636865 701__ $$aEkelöf, Tord$$edir.
001636865 710__ $$5PH
001636865 859__ [email protected]
001636865 8564_ $$8807302$$s8225558$$uhttps://cds.cern.ch/record/1636865/files/CLIC-Note-1022.pdf
001636865 8564_ $$8805629$$s8185363$$uhttps://cds.cern.ch/record/1636865/files/CERN-THESIS-2013-227.pdf$$yFulltext
001636865 8564_ $$8807302$$s36192$$uhttps://cds.cern.ch/record/1636865/files/CLIC-Note-1022.gif?subformat=icon-700$$xicon-700
001636865 8564_ $$8807302$$s8665$$uhttps://cds.cern.ch/record/1636865/files/CLIC-Note-1022.gif?subformat=icon$$xicon
001636865 916__ $$sn$$w201350$$ya2013
001636865 960__ $$a14
001636865 963__ $$aPUBLIC
001636865 970__ $$a000736102CER
001636865 980__ $$aTHESIS