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Investigation of Shot Noise in Avalanche Photodiodes

100%
Kocak F., Kilic A., Tapan I.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
721-723
EN
PbWO₄ crystal-Hamamatsu S8148 avalanche photodiode (APD) assembly has been used in the barrel section of the CMS electromagnetic calorimeter. The shot noise of the photodiode is one of the important parameters for the energy resolution of the crystal-APD system. The major source of this noise is the statistical variations in the rate at which primary charge carriers are generated and recombine. Thus, the shot noise varies with position of the primary charge carriers generated in photodiode. In this work, the shot noise properties of the Hamamatsu S8148 APD structure and zinc sulfide-silicon (ZnS-Si) isotype heterojunction APD structure have been compared for the PbWO₄ photons. Calculations were made with a Single Particle Monte Carlo simulation technique.
2
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Radiaton Effects on TAC-PF Electromagnetic Calorimeter

88%
Pilicer E., Kocak F., Kilic A., Pilicer F., Tapan I.
Acta Physica Polonica A
|
2017
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vol. 131
|
issue 1
190-192
EN
The proposed particle factory detector for Turkish Accelerator Center (TAC-PF) being a regional facility in Turkey will operate at the center of mass energy about 3.77 GeV with designed luminosity of the order of 10³⁴ cm¯² s¯¹. The electromagnetic calorimeter part of the detector is considered to have PbWO₄ and CsI(Tl) crystals coupled with photodiodes. In this study, the exposed dose rate to electromagnetic calorimeter during PF detector operation was estimated by FLUKA Monte Carlo tool. The irradiation effects such as the change of light yield and light transmission of these crystals were investigated to evaluate TAC-PF electromagnetic calorimeter energy resolution.
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