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Timing Analysis of LYSO-based Crystals

Hassanshahi, Mohammad Hassan | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51015 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Arfaei, Hessamaddin; Bornheim, Adolf
  7. Abstract:
  8. The Large Hadron Collidor (LHC) will increase its luminosity to more than 10e35 cm-2 s-1. The large amount of data rates will provide enough datasets needed to probe rare Higgs processes, study the scattering of longitudinally polarized W bosons and physics beyond the standard model(BSM). In the upgraded version of the LHC, called High Luminosity LHC (HL-LHC), the number of simultaneous interactions per bunch crossing, aka pile-up, increases to 140-200. The large number of pile increases the possibility of confusion in distinguishing vertexes of interest due to the contamination from non-interesting vertexes. One of the methods to mitigate the pile-up, complementary to the precision tracking method, is the precision timing analysis in which the time of flight(TOF) of particles are measured to reconstruct their original vertex. A time resolution of around 30 ps is needed to significantly reduce the pile-up effect. In this study, we investigate the timing analysis of a sampling calorimeter, called Shashlik, which is alternating layers of LYSO and Tungsten. The light is extracted through four fibers into Silicon photomultiplier(SiPM) photo detectors. We achieved a time resolution of 42 ps in our Shashlik test beam. We demonstrate that by improving the light collection efficiency (for example using fibers with larger diameters), the time resolution is likely to be highly improved. We also show that the DSB-filled radiation-hard quartz capillaries can be used as the wavelength shifter (WLS) of the shashlik without time resolution degradation more than an effect of amplitude loss. We finally show that Shashlik calorimeter can be a potential candidate for the electronic calorimeter of HL-LHC
  9. Keywords:
  10. Photodetector ; Scintillation ; Large Hadronic Collider ; Compact Muon Solenoid (CMS)Test ; Precision Measurments ; Calorimetry Experiment ; Precision Timing ; Particle Detector