The study and shielding of electromagnetic radiation from SuperKEKB electron and positron beam interactions

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dc.contributor.authorBeaulieu, Alexandre
dc.contributor.supervisorRoney, J. Michael
dc.date.accessioned2019-05-07T16:55:34Z
dc.date.available2019-05-07T16:55:34Z
dc.date.copyright2019en_US
dc.date.issued2019-05-07
dc.degree.departmentDepartment of Physics and Astronomyen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractThis project contributes to the research and development studies towards successful commissioning of the SuperKEKB electron-positron collider. This accelerator and storage rings complex aims at delivering the high-luminosity collisions of beams of electrons and positrons needed for the Belle II experiment. Such beams produce parasitic radiation—called “machine-induced backgrounds”, or simply “beam backgrounds” — that have detrimental effects on the experimental apparatus performance and durability. The Beast II effort is dedicated to measuring the beam backgrounds, and aims at testing the predictive power of the background models that were used in various phases of the Belle II design. A second objective is to ensure that the environment is safe for the detector prior to installing it around the beam lines. A major component of beam backgrounds consists of electromagnetic radiation. This study focusses on measuring this radiation at the location of the Belle II electromagnetic calorimeter. The measurements were achieved by placing scintillator crystals at positions representative of the Belle II calorimeter crystals that are the closest to the beam lines, and comparing the data with predictions for different operating parameters of the accelerator. Different phenomena related to machine backgrounds were observed: vacuum scrubbing, the electron-cloud effect, injection-related noise, beam-gas scattering and Touschek losses. Studies on the positron ring showed average background levels 13.5 +/- 3.5 times larger than simulation, whereas that ratio reached O(100-1000) for the electron ring. In the latter, the large uncertainty on the pressure measurements and the gas constituents limit the predictive power of the measurements. Radiation shields were also designed, fabricated, delivered and installed in the detector to protect the electromagnetic calorimeter from radiation coming from the beam lines.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/10859
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectElectron positron collidersen_US
dc.subjectMachine-induced backgroundsen_US
dc.subjectHigh-energy physics experimenten_US
dc.subjectBelle IIen_US
dc.subjectSuperKEKBen_US
dc.subjectBeast IIen_US
dc.titleThe study and shielding of electromagnetic radiation from SuperKEKB electron and positron beam interactionsen_US
dc.typeThesisen_US

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