000001474 001__ 1474
000001474 005__ 20190612174305.0
000001474 037__ $$aBELLE2-PTHESIS-2019-001
000001474 041__ $$aeng
000001474 100__ $$aAlexandre Beaulieu
000001474 245__ $$aThe Study and Shielding of Electromagnetic Radiation from SuperKEKB Electron and Positron Beam Interactions
000001474 260__ $$aVictoria BC, Canada$$bUniversity of Victoria$$c2019
000001474 300__ $$a256
000001474 500__ $$aPresented on 29 04 2019
000001474 502__ $$aPhD$$bVictoria BC, Canada, University of Victoria$$c2019
000001474 520__ $$aThis project contributes to the research and development studies towards successful commissioning of the SuperKEKB electron-positron collider. This accelerator and storage rings complex aims at delivering the high-luminosity collisions of beams of electrons and positrons needed for the Belle II experiment. Such beams produce parasitic radiation --- called ``machine-induced backgrounds'', or simply ``beam backgrounds'' --- that have detrimental effects on the experimental apparatus performance and durability.  The BEAST effort is dedicated to measuring the beam backgrounds, and aims at testing the predictive power of the background models that were used in various phases of the Belle II design. A second objective is to ensure that the environment is safe for the detector prior to installing it around the beam lines. A major component of beam backgrounds consists of electromagnetic radiation. This study focusses on measuring this radiation at the location of the Belle II electromagnetic calorimeter. The measurements were achieved by placing scintillator crystals at positions representative of the Belle II calorimeter crystals that are the closest to the beam lines, and comparing the data with predictions for different operating parameters of the accelerator. Different phenomena related to machine backgrounds were observed: vacuum scrubbing, the electron-cloud effect, injection-related noise, beam-gas scattering and Touschek losses. Studies on the positron ring showed average background levels $13.5\pm3.5$ times larger than simulation, whereas that ratio reached $\mathcal{O}\left(10^2-10^3\right)$ for the electron ring. In the latter, the large uncertainty on the pressure measurements and the gas constituents limit the predictive power of the measurements. Radiation shields were also designed, fabricated, delivered and installed in the detector to protect the electromagnetic calorimeter from radiation coming from the beam lines.
000001474 700__ $$aJohn Michael Roney$$edir.
000001474 700__ $$aMaxim Pospelov$$edir.
000001474 700__ $$aColin Bradley$$edir.
000001474 8560_ $$falexandre.beaulieu@desy.de
000001474 8564_ $$uhttps://docs.belle2.org/record/1474/files/BELLE2-PTHESIS-2019-001.pdf
000001474 980__ $$aTHESIS