Articles (KEI)

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Showing 1 - 20 out of 45 results

Separaton Efficiency and Separation Time of Mass Separator MASHA Measured for Radon and Mercury Isotopes
(2023) Kohoutová, A.; Rodin, A. M.; Krupa, L.; Chernysheva, E. V.; Gulyaev, A. V.; Gulyaeva, A. V.; Holík, Michael; Kliman, Ján; Kohout, Pavel; Komarov, A. B.; Novoselov, A. S.; Opichal, A.; Pechoušek, Jiří; Podshibyakin, A. V.; Salamatin, V. S.; Stepantsov, S. V.; Vedeneev, V. Yu.; Yukhimchuk, S. A.
The separation efficiency and extraction time of mass separator MASHA, which is a combination of solid ISOL method and classic mass spectroscopy, were obtained for mercury and radon isotopes produced in complete fusion reactions Ar-40 + Sm-144 = Hg184-xn and Ar-40 + Er-166 = Rn206-xn. The extraction time and separation efficiency at the MASHA setup for both reactions are determined by the ratio of cross sections measured with mass separator to absolute cross sections obtained in our previous experiments.
Study of low-energy gamma-ray detection performance of silicon photomultiplier with LaBr3(Ce) scintillator
(2023) Huseynzada, K.; Mammadli, A.; Isayev, K.; Naghiyev, J.; Holík, Michael; Tryshyn, V. V.; Lyubchyk, S. I.; Pekur, D. V.
Recent progress in the field of scintillators and silicon photomultipliers (SiPM) has allowed development of new scintillation detectors capable of detecting low-energy X- and gamma-ray sources that are widely used in medicine, security and industry. Such scintillation detectors are compact, insensitive to magnetic fields, have low operation voltages and are functional at room temperature. These advantages of SiPM are considered to solve the main problems facing scintillation detectors in medicine and industry today. Development of detectors of low-energy electromagnetic radiation is relevant now. Scintillation detectors based on lutetium fine silicate, LaBr3(Ce), NaI and silicon avalanche photomultipliers offer a great potential for use for X- and gamma-ray detection. The present work demonstrates the gamma-ray detection performance of a new micropixel avalanche photodiode (MAPD) array (16 (4×4) elements – 15×15 cm) with a LaBr3(Ce) scintillator (15×15×30 mm) using 177Lu and 133Ba isotopes as the gamma-ray sources.
Design and Modelling of a Modified High Gain Printed Vivaldi Antenna for EMC Measurements
(2024) Almtrod, Abdalghfor Abdalghfar A; Alnahwi, Falih M.; Kubík, Zdeněk
This paper demonstrates the design, modeling, and analysis of a small size 180 x 165 x 1.6 mm3 printed broadband Vivaldi antenna for electromagnetic compatibility measurements. The proposed antenna is intended to be utilized as a reference antenna for emission and immunity tests inside the EMC Chamber through the band (0.8-5.5 GHz). Exponentially tapered slots were created based on mathematical equations to form an end-fire radiation antenna. Furthermore, microstrip and slot line stubs were employed to tune the impedance bandwidth. This antenna could be considered a 2-D Horn antenna with a size reduction of 64% and 67% since both antennas, Vivaldi and Horn are based on the same principle. Two rectangular slots were engraved near the feeding point to reshape and enhance the gain at lower frequency bands. Furthermore, the realized gain has been improved by approximately 3.5 dB and reached up to 10.7 dBi by introducing a pair of triangular reversal slots at the top edges of the structure. Moreover, this antenna has specifications that make it a suitable candidate to work as a reference antenna inside the EMC chamber compared to the classical Horn antenna offered for sale (PowerLOG (R) PRO 30800 and TBMA4).
A gamma-ray spectrometer based on MAPD-3NM-2 and LaBr3(ce) and LSO scintillators for hydrogen detection on planetary surfaces
(2025) Ahmadov, F.; Sadigov, A.; Bacherikov, Yu. Yu.; Okhrimenko, O.; Isayev, K.; Holík, Michael; Slavíček, Tomáš; Mamedov, Fadahat; Ahmadov, G.; Mammadli, A.; Akbarov, R.; Nagiyev, J.; Berikov, D.; Nuruyev, S.; Sadygov, Z.; Shitov, Yu.; Lyubchyk, S. I.; Lyubchyk, S. B.
The presented work is dedicated to the detection of hydrogen, using detectors based on a MAPD (Micropixel Avalanche Photodiode) array based on new MAPD-3NM-2 type photodiodes and two different scintillators (LaBr3(Ce) and LSO(Ce)). The physical parameters of the MAPD photodiode used in the study and the intrinsic background of the scintillators were investigated. For the 2.223 MeV energy gamma-ray indicating the presence of hydrogen, the energy resolution was 6.89% with the MAPD array and LSO scintillator-based detector, and the number of events corresponding to this energy was 4817. With the MAPD array and LaBr3(Ce) scintillator, the energy resolution for the 2.223 MeV gamma-ray was 3.55%, and the number of events corresponding to this energy was 3868. The LSO scintillator-based detector allowed for the detection of 24.5% more 2.223 MeV energy gamma-rays compared to the LaBr3(Ce) scintillator. For the 2.223 MeV gamma-ray associated with hydrogen, the energy resolution with the LaBr3(Ce) scintillator was 48.5% better than with the LSO scintillator. The lower energy resolution compared to the LSO is due to the higher light output of LaBr3(Ce). The obtained results experimentally demonstrate that it is possible to obtain information about the presence of hydrogen in the target using both detectors.
Investigation of the gamma radiation resistance of MAPD-3NK and MPPC-S12572-10P SiPMs
(2025) Ahmadov, F.; Mammadli, A.; Sadygov, A.; Berikov, D.; Ahmadov, G.; Holík, Michael; Nuruyev, S.; Sadygov, Z.; Mamadov, F.
In this paper, we investigate the physical properties of the MPPC-S12572-10P and MAPD-3NK silicon photomultipliers (SiPMs) operating in Geiger mode with both deep-buried pixels and surface pixel structure under the influence of gamma radiation with an average energy of 1.25 MeV. Both types of photodiodes were irradiated with doses of 10 kGy, 40 kGy and 100 kGy. Changes in the dark current, capacitance, photosignal amplitude and operating voltage of the irradiated photodiodes were studied.
Performance of styrene polymerized plastic scintillator with micropixel avalanche photodiode
(2024) Sadigov, A.; Ahmadov, F.; Ahmadov, G.; Aksu, E.; Berikov, D.; Nuruyev, S.; Akbarov, R.; Holík, Michael; Mamedov, F.; Nagiyev, J.; Güner, S. Gürbüz; Mammadli, A.; Suleymanova, N.; Abbasova, C.; Melikova, S.; Yilmaz, E.; Tagiyev, O.; Lyubchyk, S.; Sadygov, Z.
This paper presents the performance of polystrene based plastic scintillator produced in Turkish Energy, Nuclear and Mineral Research Agency (TENMAK). The scintillator is manufactured using thermal polymerization of commercially available styrene monomer doped with first and second fluorescent dyes. The absorption spectrum of the scintillator exhibited two absorption bands at 225 nm and 340 nm, with an absorption edge observed at 410 nm. The wavelength of the emitted light was measured in the range of 400–800 nm, with a maximum intensity at 427 nm. Internal conversion electrons from the 137Cs source were used to evaluate the characteristics of the new scintillator, particularly its light yield. As the light readout the MAPD-3NM type silicon photomultiplier array (4 × 4) with an active area of 15 × 15 mm2, assembled using single MAPDs with an active area of 3.7 × 3.7 mm2, was used. The light yield of the scintillator was determined to be 6134 photons/MeV. In addition, the efficiency of the scintillator for gamma rays with an energy of 662 keV was found out to be approximately 1.8%. CmBe neutron source was employed to evaluate its fast neutron detection performance. However, neutron/gamma discrimination using pulse shape discrimination (charge integration) method was not observed. The results demonstrate the potential of produced plastic scintillator for various applications, particularly in radiation monitoring and detection systems.
Frequency reconfigurable key-shape antenna for LTE applications
(2023) Almtrod, Abdalghfor Abdalghfar A; Alnahwi, Falih M.; Al-Anbagi, Haidar Najim Abbod; Kubík, Zdeněk; Abdullah, Abdulkareem S.
This paper presents a compact dual-band reconfigurable antenna. This antenna covers the Long-Term Evolution (LTE) bands 1.9 GHz, 2.4 GHz, and 3 GHz. The reconfigurability was achieved with two PIN-diodes which provided four switching states. Both frequency and radiation characteristics have consistent results. The antenna gain was evaluated at every switching state. Results from the simulation and measurements have good agreement.
Neutron/gamma scintillation detector for status monitoring of accelerator-driven neutron source IREN
(2024) Nuruyev, S.; Berikov, D.; Akbarov, R.; Ahmadov, G.; Ahmadov, F.; Sadigov, A.; Holík, Michael; Naghiyev, J.; Madadzada, A.; Udovichenko, K.
This paper presents a neutron/gamma detector based on a micropixel avalanche photodiode and a plastic scintillator that monitors the status of the accelerator-driven intense resonance neutron source (IREN) facility by measuring the neutron/gamma intensity in the target hall. The electronics of the neutron/gamma detector has been designed and developed. The size of the plastic scintillator was selected to be 3.7 × 3.7 × 30 mm3 due to the sensitive area of the MAPD. The experimental results demonstrated a dependence between the count rate of the detector and the frequency of the accelerator. The detector is sensitive to intermediate and fast neutrons. The minimum detectable energy was determined to be 200 keV using Cs-137 point gamma source. The maximum counting rate of the detector from TTL out is about 2.2·106 counts/sec, but for analogue output it is about 2·107 counts/sec. The detector can not allow discriminating neutrons and gamma rays by charge integration method.
A low-cost microwave filter with improved passband and stopband characteristics using stub loaded multiple mode resonator for 5g mid-band applications
(MDPI, 2021) Alnahwi, Falih M.; Al-Yasir, Yasir I.A.; Almtrod, Abdalghfor Abdalghfar A; Abdullah, Abdulkareem S.; Abd-Alhameed, Raed A.
Simulation of electrical system protection against the effects of a magnetic storm
(De Gruyter, 2023) Štork, Milan; Mayer, Daniel
Metaverse and AI Digital Twinning of 42SiCr Steel Alloys
(MDPI, 2023) Khalaj, Omid; Jamshidi, Mohammad; Hassas, Parsa; Hosseininezhad, Marziyeh; Mašek, Bohuslav; Štádler, Ctibor; Svoboda, Jiří
Gamma ray detection performance of newly developed MAPD‑3NM‑II photosensor with LaBr3 (Ce) crystal
(Nature Research, 2022) Holík, Michael; Ahmadov, F.; Sadigov, A.; Ahmadov, G.; Berikov, D.; Mamedov, Fadahat; Naghiyev, J.; Štekl, Ivan; Sadygov, Z.; Mammadli, A.; Garibli, A.; Urban, Ondřej; Zich, Jan
Improvement of parameters of micro-pixel avalanche photodiodes
(Institute of Physics, 2022) Sadigov, A.Z.; Ahmadov, F. I.; Sadygov, Z. Y.; Ahmadov, G. S.; Berikov, D.; Holík, Michael; Mammadli, A.; Akbarov, R. A.; Nuruyev, S. M.; Ajdarli, K.; Garibli, A.; Doganci, E.; Mora Sierra, Yesid; Yilmaz, E.
The paper is concerned with the parameter study of a new generation of micro-pixel avalanche photodiodes (MAPD) with deeply buried pixel structure, also named silicon photomultipliers (SiPM) or multi-pixel photon counter (MPPC). The new MAPD of type MAPD-3NM was manufactured in the frame of collaboration with Zecotek Company. Measurements were carried out and discussed in terms of the important parameters such as the current-voltage and capacitance-voltage characteristic, gain, the temperature coefficient of breakdown voltage, breakdown voltage, and gamma-ray detection performance using an LFS scintillator. The obtained results showed that the newly developed MAPD-3NM photodiode outperformed the previous generation in most parameters and can be successfully applied in space application, medicine, high-energy physics, and security. New proposals are also discussed, for further improvement of the parameters of the MAPD photodiodes that will be produced in the coming years. © 2022 IOP Publishing Ltd and Sissa Medialab.
Improved algorithms for determination of particle directions with Timepix3
(IOP Publishing, 2022) Mánek, Petr; Bergmann, Benedikt; Burian, Petr; Garvey, Declan; Meduna, Lukáš; Pospíšil, Stanislav; Smolyanskiy, Petr; White, E.
Timepix3 pixel detectors have demonstrated great potential for tracking applications. With 256 × 256 pixels, 55 μm pitch and improved resolution in time (1.56 ns) and energy (2 keV at 60 keV), they have become powerful instruments for characterization of unknown radiation fields. A crucial pre-processing step for such analysis is the determination of particle trajectories in 3D space from individual tracks. This study presents a comprehensive comparison of regression methods that tackle this task under the assumption of track linearity. The proposed methods were first evaluated on a simulation and assessed by their accuracy and computational time. Selected methods were then validated with a real-world dataset, which was measured in a well-known radiation field. Finally, the presented methods were applied to experimental data from the Large Hadron Collider. The best-performing methods achieved a mean absolute error of 1.99° and 3.90° in incidence angle θ and azimuth φ, respectively. The fastest presented method required a mean computational time of 0.02 ps per track. For all experimental applications, we present angular maps and stopping power spectra.
Dlouhá cesta od základního výzkumu k ultravysokopevnému zápustkovému výkovku
(Svaz kováren ČR z.s., 2022) Mašek, Bohuslav; Štádler, Ctibor; Červenka, František; Papežík, Miroslav; Svoboda, Jiří; Holota, Radek; Georgiev, Vjačeslav; Skála, Jiří; Khalaj, Omid; Hammerbauer, Jiří
In the last two decades, in search for savings, new technologies for steel processing have begun to be developed, which would bring improvements in performance according to the requirements of designers and specific applications. The driving force was the automotive industry, which, in an effort to reduce costs, established several important directions in the sheet metal research, enabling interesting combinations of ductility and strength to be achieved with an economical method of alloying. But even the area of die forgings can benefit from the knowledge gained in the future. One of such projects, focused on the integration of the Q-P process into the production of ultra-high strength die forgings, was carried out by Kovárna VIVA, Zlín together with the Department of Electronics and Information Technology of the University of West Bohemia.
The Influence of Cooling Rate between Ms and Mf on the Mechanical Properties of Low Alloy 42SiCr Steel Treated by the Q-P Process
(MDPI, 2022) Khalaj, Omid; Saebnoori, Ehsan; Mašek, Bohuslav; Štádler, Ctibor; Hassas, Parsa; Svoboda, Jiří
A series of experiments was conducted by quenching and partitioning (Q-P) heat-treated alloys to investigate the effect of cooling intensity on the mechanical properties of low alloy steel 42SiCr. By applying a conventional heat treatment, reasonable high strength can be achieved; however, the alloys become more brittle. To obtain an optimal balance, advanced heat treatment methods like the Q-P process can be used. It consists of quenching to temperatures between martensite start and martensite finish temperatures and holding, which leads to the stabilization of untransformed austenite by carbon partitioning. The martensitic microstructure is then formed with a small volume fraction of retained austenite embedded on a microscopic scale. The material’s deformability can be significantly improved by using such heat treatment processes. Moreover, to improve advanced high strength properties (AHSS), an additional Q-P process can be applied, which leads to erasing the influence of cold forming as well as enhancement of the mechanical properties. Several combinations of the Q-P process with/without partitioning were performed with various cooling rates for both heat treatment methods. Ultimate Tensile Strength (UTS), Ductility and Hardness (HV10), as well as the microstructure of the alloys, are compared to evaluate the cooling intensity effects. The cooling rate is found not to be a significant factor influencing mechanical properties, which is a crucial point for practical material heat treatment.
Evaluation of the Effect of Varying the Angle of Asphaltic Concrete Core on the Behavior of the Meijaran Rockfill Dam
(MDPI, 2022) Khalaj, Omid; Ahmadi, Alireza Ayati; Nejad, Sobhan Abedin; Mašek, Bohuslav; Štádler, Ctibor; Skála, Jiří
Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements
(MDPI, 2022) Almtrod, Abdalghfor Abdalghfar A; Kubík, Zdeněk
Electronic System for Reduction of Transient Inrush Current in Transformer
(Egyptian Computer Society, 2022) Hammerbauer, Jiří; Štork, Milan
Characterization of the miniPlanacon XPM85112-S-R2D2 MCP-PMT with custom modified backend electronics
(Elsevier, 2022) Komárek, Tomáš; Urbášek, Vladimír; Brandt, A.; Černý, Karel; Chirayath, V.A.; DeFazio, J.; Georgiev, Vjačeslav; Hail, S.; Hrabovský, Miroslav; Kubík, Zdeněk; Nožka, Libor; Orlov, D.; Pinto, S. Duarte; Rijssenbeek, M.; Sýkora, Tomáš; Yang, F.; Zich, Jan

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