Person: KOÇAK, FATMA
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KOÇAK
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FATMA
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Publication Evaluation of energy resolution by changing angle and position of incident photon in a lyso calorimeter(Jagiellonian Univ Press, 2020-01-01) Saad, A. M. E.; Koçak, Fatma; KOÇAK, FATMA; Saad, Ahmed Mohamed Elfatih; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; 0000-0002-4756-9988; JZE-5260-2024; AAE-3350-2022In this paper, we investigate the effect on energy resolution from changing the angle and the position of incidence photon for a 5 x 5 crystal matrix built with (25 x 25 x 200) mm(3) LYSO scintillating crystals. Those crystals have been proposed for the electromagnetic calorimeter of the Turkish Accelerator Center-Particle Factory (TAC-PF) detector. The energy resolution was obtained as sigma(E)/E = 0.42%/ root E/GeV circle plus 1.60% at the center of the matrix in the energy range of 50 MeV to 2 GeV. When we examined the dependence of the energy resolution on the incidence angle of the photon, resolution began to deteriorate at angles greater than 2 degrees on the 5 x 5 crystal matrix. Moreover, energy resolution at the corners of the central crystal was worse than at the center of the central crystal by a factor of 1.3 at 50 MeV and 1.1 at 2 GeV.Publication The impact of crystal length on calorimeter energy resolution(Amer Inst Physics, 2019-01-01) Saad, Ali; Koçak, Fatma; Kırca, Zerrin; Akkuş, B; Mutlu, R. B. C.; Güdekli, E; Kinaci, B; Güzelçimen, F; Doğan, G. S.; Öztürk, FC; Ertoprak, A; ABDILLAHI, SAAD ALI; KOÇAK, FATMA; KIRCA, ZERRİN; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; Akkus, B; Mutlu, RBC; Gudekli, E; Kinaci, B; Guzelcimen, F; Dogan, GS; Ozturk, FC; Ertoprak, A; 0000-0002-4756-9988; 0000-0002-4756-9988; JZE-5260-2024; AAE-3350-2022; JZE-5260-2024; AAE-3350-2022; HRR-9067-2023Lutetium-yttrium oxyorthosilicate (LYSO) crystal scintillators were originally developed for medical applications. Owing to their high density, small Moliere radius, fast response, and high radiation hardness, LYSO crystals have also suitable for future homogeneous electromagnetic calorimeters. Due to these features, LYSO is considered to be used for the electromagnetic calorimeter part of the Turkish Accelerator Center Particle Factory (TAC-PF) detector. In this research, by employing the GEANT4 toolkit program, we simulated a set of crystal, and their energy resolutions were obtained for different lengths at the energy range of 50 MeV - 2 GeV. Depending on the crystal length, contributions to the constant term of the energy resolution were investigated.Publication Determination of position resolution for LYSO scintillation crystals using geant4 monte carlo code(Hindawi, 2021-09-15) Yahya, M. F. O.; Koçak, F.; Yahya, M. F. O.; KOÇAK, FATMA; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; 0000-0002-4756-9988; 0000-0001-5214-328X; GJI-3524-2022; AAE-3350-2022LYSO scintillation crystals, due to their significant characteristics such as high light yield, fast decay time, small Moliere radius, and good radiation hardness, are proposed to be used for the electromagnetic calorimeter section of the Turkish Accelerator Center Particle Factory (TAC-PF) detector. In this work, the center of gravity technique was used to determine the impact coordinates of an electron initiating an electromagnetic shower in a LYSO array, in a calorimeter module containing nine crystals, each 25 mm x 25 mm in cross-section and 200 mm in length. The response of the calorimeter module has been studied with electrons having energies in the range 0.1 GeV-2 GeV. By using the Monte Carlo simulation based on Geant4, the two- dimensional position resolution of the module is obtained as sigma(R) (mm) = ((3.95 +/- 0.08)root E) circle plus (1.91 +/- 0.11) at the center of the crystal.