magistrsko delo
Petja Skomina (Author), Igor Mandić (Mentor), Gregor Kramberger (Co-mentor)

Abstract

V magistrskem delu je predstavljena študija efektivne razdalje med blazinicami prototipov plazovnih detektorjev z nizko stopnjo pomnoževanja za Visoko zrnati detektor časa na eksperimentu ATLAS. Preučili smo prototipe dveh proizvajalcev. Plazovni detektorji z nizko stopnjo pomnoževanja so bili izbrani za določanje časa preleta nabitih delcev na Visoko-luminoznostnem velikem hadronskem trkalniku zaradi izjemne časovne ločljivosti, ki jo zagotavlja dodatna plast silicija z visoko koncentracijo primesi imenovana pomnoževalna plast. V tem delu smo se osredotočili na proučevanje območja med blazinicami v prototipih. Vzorce smo obsevali z reaktorskimi nevtroni do ekvivalentne fluence $2,5 \cdot 10^{15} \, 1 \, \mathrm{MeV} n_{eq} \, \mathrm{cm^{-2}}$ in proučili posledice sevalnih poškodb na efektivno razdaljo med blazinicami. Osnovne lastnosti detektorjev smo pridobili iz meritev karakteristik C-V in I-V. Odvisnost efektivne razdalje med blazinicami od zunanje napetosti in fluence smo sistematično izmerili s tehniko prehodnega toka z uporabo laserske svetlobe različnih valovnih dolžin. Ugotovili smo, da je razlog za razliko med izmerjenimi in nominalnimi razdaljami med blazinicami posledica ukrivljanja silnic električnega polja na robovih blazinic. Opravili smo tudi simulacije in rezultate primerjali z meritvami.

Keywords

silicijevi detektorji;detektorji delcev;plazovni detektorji;sevalne poškodbe;čas preleta;časovna resolucija;pomnoževanje naboja;veliki hadronski trkalnik;eksperiment ATLAS;Visoko zrnati detektor časa;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [P. Skomina]
UDC: 539.1.074
COBISS: 163954947 Link will open in a new window
Views: 15
Downloads: 5
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Other data

Secondary language: English
Secondary title: Studies of inter-pad distance in Low-Gain Avalanche Detectors
Secondary abstract: This master’s thesis presents a study on the effective inter-pad distance of low gain avalanche detector (LGAD) prototypes for the High Granularity Timing Detector at the ATLAS experiment. Prototypes from two producers were investigated. LGADs are the technology of choice for track timing detectors at the upgraded High-Luminosity Large Hadron Collider due to their superior timing resolution provided by the additional highly doped layer called the gain layer. Measurements presented in this work focus on the inter-pad region of the prototypes. Effects of radiation damage on the effective inter-pad distance have been studied by measuring samples irradiated with reactor neutrons to an equivalent fluence of $2,5 \cdot 10^{15} \, 1 \, \mathrm{MeV} n_{eq} \, \mathrm{cm^{-2}}$. Basic properties of the detectors were extracted by measuring the C-V and I-V characteristics. The dependence of the effective inter-pad distance on bias voltage and fluence was systematically measured with the Transient Current Technique using laser light of different wavelengths. Bending of the electric field lines at the edges of the electrodes was found to be the reason for the difference between measured and nominal inter-pad distances. The effective inter-pad distances were also simulated and compared to the measurements.
Secondary keywords: silicon detectors;particle detectors;avalanche detectors;radiation damage;timing measurements;time resolution;charge multiplication;Large Hadron Collider;ATLAS experiment;High Granularity Timing Detector;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: 57 str.
ID: 19929378