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000000311 005__ 20160805033907.0
000000311 037__ $$aBELLE2-MTHESIS-2015-004
000000311 041__ $$aeng
000000311 100__ $$aSavino Longo
000000311 245__ $$aMeasurements of the Radiation Hardness of CsI(Tl) Scintillation Crystals and Comparison Studies with Pure CsI for the Belle II Electromagnetic Calorimeter
000000311 260__ $$aVictoria$$bUniversity of Victoria$$c2015
000000311 300__ $$amult. p
000000311 500__ $$aPresented on 10 09 2015
000000311 502__ $$aMSc$$bVictoria, University of Victoria$$c2015
000000311 520__ $$aIn preparation for the large backgrounds expected to be present in the Belle II detector from the SuperKEKB e+e- collider, the radiation hardness of several large (5 x 5 x 30 cm3) thallium doped cesium iodide (CsI(Tl)) scintillation crystals are studied. The crystal samples studied consist of 2 spare crystals from the Belle experiment using PIN diode readout and 7 spare crystals from the BaBar experiment using photomultiplier tube readout. The radiation hardness of the scintillation properties of the CsI(Tl) crystals was studied at accumulated 1 MeV photon doses of 2, 10 and 35 Gy. At each dose, the longitudinal uniformity of the crystals light yield, scintillation decay times, time resolution and energy resolution was measured. As the Belle II collaboration is considering an upgrade to pure CsI crystals if CsI(Tl) does not satisfy radiation hardness requirements, the scintillation properties of a pure CsI scintillation crystal were also measured and compared to the CsI(Tl) crystal measurements. In addition to experimental work, Monte Carlo simulations using GEANT4 were written to compare ideal pure CsI and CsI(Tl) crystals and to study the effects of radiation damage on the performance of the Belle II electromagnetic calorimeter.
000000311 700__ $$aJohn Michael Roney$$edir.
000000311 8560_ $$flongos@uvic.ca
000000311 8564_ $$uhttps://docs.belle2.org/record/311/files/BELLE2-MTHESIS-2015-004.pdf
000000311 8564_ $$uhttps://docs.belle2.org/record/311/files/BELLE2-MTHESIS-2015-004.pdf?subformat=pdfa$$xpdfa
000000311 980__ $$aTHESIS