1. Nuclear heating at the JSI TRIGA reactor : measurements and simulationsKlemen Ambrožič, Vladimir Radulović, Luka Snoj, Hubert Carcreff, Damien Fourmentel, Christophe Destouches, Nicolas Thiollay, 2026, izvirni znanstveni članek Povzetek: Nuclear heating plays an important aspect in design and deployment of both fission and fusion reactors and experimental devices in terms of cooling requirements. Two experimental campaigns in the framework of a collaboration project between the French Atomic and Alternative Energy Commission (CEA) and Jožef Stefan Institute (JSI), Slovenia, have been performed at the JSI TRIGA reactor for the experimental assessment of nuclear heating in fission and fusion-relevant materials by the differential calorimetry technique, based on the CALMOS and CARMEN differential calorimeters, previously developed at CEA. The results of the first campaign performed at reactor powers between 100 and 250 kW have already been reported, highlighting some measurement difficulties. Therefore, the second campaign was performed at a lower reactor power of 30 kW to overcome these issues. Moreover, a computational analysis of the experiments was performed using the JSIR2S code package to calculate the nuclear heating levels. Both experiments and their reproduction by simulations are described in detail. We present a comparison of the previously reported measured nuclear heating values of the first campaign with the computational results, with consistent underestimation by simulations by 8–35%. We report the experimental and computational results for the second experimental campaign performed at a reactor power of 30 kW. The simulated heating values were in agreement with the measurements within the measured heating uncertainty, with simulated heating 2.7–11.3% lower than the experimental values.
Ključne besede: nuclear heating, differential calorimeter, R2S (rigorous two-step method), MCNP, Eurofer97, Tungsten
Objavljeno v DiRROS: 20.02.2026; Ogledov: 182; Prenosov: 64
 Celotno besedilo (1,63 MB)
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2. Study of the neutron radiation hardness of MAPD-3NK2 silicon photomultipliersKlemen Ambrožič, Anže Jazbec, M. Holik, S. Nuruyev, F. Ahmadov, G. Ahmadov, O. Okhrimenko, A. Mammadli, A. Sadygov, Z. Sadygov, 2025, izvirni znanstveni članek Povzetek: The radiation hardness of MAPD-3NK2 photodiodes with deep-buried pixel structures was evaluated under neutron irradiation at fluences ranging from 3.6 × 109to 3.6 × 1012neq/cm². Irradiation induced dark current increase of up to 2060 times, a breakdown voltage shift of (0.37 ± 0.08) V, a photo signal amplitude reduction of (90.1 ± 0.4) %, and a tenfold degradation in amplitude resolution. Partial recovery was observed after 40 days of room-temperature annealing, with dark current decreasing by 35%.Similar performance changes were observed in photodiodes with artificially elevated dark current, indicating that excess current is the primary driver of degradation. This current likely impedes photoelectron detection by occupying pixels or failing to fully quench the avalanche process, thereby reducing photocurrent.
Ključne besede: neutron irradiation, radiation hardness, silicon photomultipliers, photodiodes, dark current degradation
Objavljeno v DiRROS: 26.11.2025; Ogledov: 593; Prenosov: 144
Celotno besedilo (2,87 MB)
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3. A half-century of nuclear research, education and training : Story of the JSI TRIGA reactorLuka Snoj, Klemen Ambrožič, L. Barbot, Ljudmila Benedik, Arne Bratkič, Ivana Capan, C. Reynard-Carette, Vladimir Cindro, Dušan Čalič, Christophe Destouches, B. Geslot, Alireza Haghighat, Romain Henry, Milena Horvat, Elchin Huseynov, Gregoire De Izzara, Radojko Jaćimović, Anže Jazbec, Igor Jenčič, Robert Jeraj, Malcolm Joyce, Domen Kotnik, Gregor Kramberger, Igor Lengar, Jan Malec, Igor Mandić, Valerio Mascolino, Vid Merljak, Marko Mikuž, Gilles Noguere, Julijan Peric, Anže Pungerčič, Vladimir Radulović, Sebastjan Rupnik, Borut Smodiš, Zdenka Šlejkovec, Marko Štrok, Žiga Štancar, Ingrid Švajger, N. Thiollay, Iztok Tiselj, Andrej Trkov, Bojan Žefran, Gašper Žerovnik, Ylenia Žiber, Tanja Goričanec, 2025, pregledni znanstveni članek Povzetek: The TRIGA Mark II research reactor at the Jožef Stefan Institute is a key facility in the field of nuclear research, characterized by its versatility and applicability in a wide range of scientific disciplines. This document highlights its operational history, contributions to nuclear safety, education and various scientific applications, including advances in reactor and radiation physics, neutron activation analysis, environmental science and even contributions to the fight against the COVID-19 pandemic. It highlights the reactor’s significant role in fostering international collaborations, improving computer modeling techniques for nuclear research, and providing invaluable educational experiences. The great versatility and applicability of the JSI TRIGA reactor is emphasized by its adaptability to various research needs and its ability to enable groundbreaking studies in both fundamental and applied sciences
Objavljeno v DiRROS: 11.04.2025; Ogledov: 933; Prenosov: 242
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