Search

Your search keyword '"Nagai, Andrii"' showing total 15 results
Start Over Author "Nagai, Andrii"
15 results on '"Nagai, Andrii"'

1. Characterisation of the MUSIC ASIC for large-area silicon photomultipliers for gamma-ray astronomy

Author

De Angelis, Nicolas, Gascón, David, Gómez, Sergio, Heller, Matthieu, Montaruli, Teresa, and Nagai, Andrii

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

Large-area silicon photomultipliers (SiPMs) are desired in many applications where large surfaces have to be covered. For instance, a large area SiPM has been developed by Hamamatsu Photonics in collaboration with the University of Geneva, to equip gamma-ray cameras employed in imaging atmospheric Cherenkov telescopes. Being the sensor about 1 cm$^2$, a suitable preamplification electronics has been investigated in this work, which can deal with long pulses induced by the large capacitance of the sensor. The so-called Multiple Use SiPM Integrated Circuit (MUSIC), developed by the ICCUB (University of Barcelona), is investigated as a potential front-end ASIC, suitable to cover large area photodetection planes of gamma-ray telescopes. The ASIC offers an interesting pole-zero cancellation (PZC) that allows dealing with long SiPM signals, the feature of active summation of up to 8 input channels into a single differential output and it can offer a solution for reducing power consumption compared to discrete solutions. Measurements and simulations of MUSIC coupled to two SiPMs developed by Hamamatsu are considered and the ASIC response is characterized. The 5$^{th}$ generation sensor of the Low Cross Talk technology coupled to MUSIC turns out to be a good solution for gamma-ray cameras., Comment: 16 pages, 15 figures

Published
2022
Full Text
View/download PDF

2. Calibration and operation of SiPM-based cameras for gamma-ray astronomy in presence of high night-sky light

Author

Samarai, Imen Al, Alispach, Cyril Martin, Balbo, Matteo, Barbano, Anastasia Maria, Beshley, Vasyl, Biland, Adrian, Blazek, Jiri, Błocki, Jacek, Borkowski, Jerzy, Bulik, Tomek, Cadoux, Frank Raphael, Chytka, Ladislav, Coco, Victor, De Angelis, Nicolas, Della Volpe, Domenico, Favre, Yannick, Gieras, Tomasz, Grudzińska, Mira, Hamal, Petr, Heller, Matthieu, Hrabovsky, Miroslav, Juryšek, Jakub, Kasperek, Jerzy, Koncewicz, Katarzyna, Kotarba, Andrzej, Lyard, Étienne, Mach, Emil, Mandat, Dusan, Michal, Stanislav, Michałowski, Jerzy, Moderski, Rafal, Montaruli, Teresa, Nagai, Andrii, Neise, Dominik, Niemiec, Jacek, Ekoume, Theodore Rodrigue Njoh, Ostrowski, Michal, Palatka, Miroslav, Paśko, Paweł, Pech, Miroslav, Pilszyk, Bartłomiej, Przybilski, Henry, Rajda, Paweł, Renier, Yves, Rozwadowski, Paweł, Schovanek, Petr, Seweryn, Karol, Sliusar, Vitali, Smakulska, Dorota, Sobczyńska, Dorota, Stawarz, Łukasz, Świerblewski, Jacek, Świerk, Paweł, Travnicek, Petr, Pujadas, Isaac Troyano, Walter, Roland, Wiecek, Marek, Zagdański, Aleksander, and Ziȩtara, Krzysztof

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The next generation of Cherenkov telescope cameras feature Silicon Photo Multipliers (SiPM), which can guarantee excellent performance and allow for observation also under moonlight, increasing duty-cycle and therefore the physics reach. A 4 m-diameter Davies-Cotton prototype telescope with a 9-degree optical FoV and a 1296-pixel SiPM camera, has been designed to meet the requirements of the next generation of ground-based gamma-ray observatories at the highest energies. The large-scale production of the telescopes for array deployment has required the development of a fully automated calibration strategy which relies on a dedicated hardware, the Camera Test Setup (CTS). For each camera pixel, the CTS is equipped with two LEDs, one operated in pulsed mode to reproduce signal and one in continuous mode to reproduce night-sky background. In this contribution we will present the camera calibration strategy, from the laboratory measurement to the on-site monitoring with emphasis on the results obtained with the first camera prototype. In addition, key performances such as charge resolution, time resolution and trigger efficiencies and their degradation with increasing night-sky background level will be presented.

Published
2019

3. Monte Carlo study of a single SST-1M prototype for the Cherenkov Telescope Array

Author

Jurysek, Jakub, Samarai, Imen Al, Alispach, Cyril, Balbo, Matteo, Barbano, Anastasia Maria, Beshley, Vasyl, Biland, Adrian, Blazek, Jiri, Błocki, Jacek, Borkowski, Jerzy, Bulik, Tomek, Cadoux, Frank Raphael, Chytka, Ladislav, Coco, Victor, De Angelis, Nicolas, Della Volpe, Domenico, Favre, Yannick, Gieras, Tomasz, Grudzińska, Mira, Hamal, Petr, Heller, Mathieu, Hrabovsky, Miroslav, Kasperek, Jerzy, Koncewicz, Katarzyna, Kotarba, Andrzej, Lyard, Etienne, Mach, Emil, Mandat, Dusan, Michal, Stanislav, Michalowski, Jerzy, Moderski, Rafal, Montaruli, Teresa, Nagai, Andrii, Neise, Dominik, Niemiec, Jacek, Ekoume, Theodore Rodrigue Njoh, Ostrowski, Michal, Palatka, Miroslav, Pasko, Pawel, Pech, Miroslav, Pilszyk, Bartłomiej, Przybilski, Henry, Rajda, Pawel, Renier, Yves, Rozwadowski, Paweł, Schovanek, Petr, Seweryn, K., Sliusar, Vitalii, Smakulska, Dorota, Sobczyńska, Dorota, Stawarz, Łukasz, Świerblewski, Jacek, Świerk, Paweł, Travnicek, Petr, Pujadas, Isaac Troyano, Walter, Roland, Wiecek, Marek, Zagdański, Aleksander, and Zietara, Krzystof

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The SST-1M telescope was developed as a prototype of a Small-Size-Telescope for the Cherenkov Telescope Array observatory and it has been extensively tested in Krakow since 2017. In this contribution we present validation of the Monte Carlo model of the prototype and expected performance in Krakow conditions. We focus on gamma/hadron separation and mono reconstruction of energy and gamma photon arrival direction using Machine learning methods., Comment: 8 pages, 13 figures, ICRC 2019 proceeding

Published
2019

4. Silicon Photomultiplier for Medical Imaging -Analysis of SiPM characteristics-

Author

Nagai, Andrii, Dinu-Jaeger, Nicoleta, and Para, Adam

Subjects
Physics - Instrumentation and Detectors
Abstract

This paper proposes an automatic procedure, based on ROOT data Analysis Framework, for the analysis of Silicon Photomultipliers (SiPM) characteristics. In particular, it can be used to analyze experimental waveforms, from oscilloscope, containing SiPM pulses acquired at different temperatures and bias voltages. Important SiPMs characteristics such as: charge distribution, gain, breakdown voltage, pulse shape (rise time and recovery time) and overvoltage can been calculated. Developed procedure can be easily used to analyze any type of SiPM detectors.

Published
2019

5. Mono and stereo performance of the two SST-1M telescope prototypes

Author

Jurysek, Jakub, primary, Tavernier, Thomas, additional, Novotný, Vladimír, additional, Heller, Matthieu, additional, Mandat, Dusan, additional, Pech, Miroslav, additional, Araudo, Anabella, additional, Alispach, Cyril Martin, additional, Beshley, Vasyl, additional, Blazek, Jiri, additional, Borkowski, Jerzy, additional, Boula, Stella, additional, Bulik, Tomasz, additional, Cadoux, Franck, additional, Casanova, Sabrina, additional, Christov, Asen, additional, Chytka, Ladislav, additional, Favre, Yannick, additional, Gieras, Tomasz, additional, Hamal, Petr, additional, Hrabovsky, Miroslav, additional, Jelinek, Martin, additional, Karas, Vladimir, additional, Gibaud, Laetitia, additional, Lyard, Étienne, additional, Mach, Emil, additional, Michal, Stanislav, additional, Michalowksi, Jerzy, additional, Moderski, Rafal, additional, Montaruli, Teresa, additional, Muthyala, Srija Reddy, additional, Muraczewski, Adam, additional, Nalewajski, Krzysztof, additional, Nagai, Andrii, additional, Neise, Dominik, additional, Niemiec, Jacek, additional, Nikolajuk, Marek, additional, Palatka, Miroslav, additional, Prouza, Michael, additional, Rajda, Pawel, additional, Schovanek, Petr, additional, Seweryn, Karol, additional, Sliusar, Vitalii, additional, Stawarz, Lukasz, additional, Strobl, Jan, additional, Swierk, Pawel, additional, Świerblewski, Jacek, additional, Travnicek, Petr, additional, Ostrowski, Michał, additional, Vicha, Jakub, additional, Della Volpe, Domenico, additional, Walter, Roland, additional, Marek, Wojciech, additional, Zagdański, Aleksander, additional, and Ziȩtara, Krzysztof, additional

Published
2023
Full Text
View/download PDF

6. Characterisation of the MUSIC ASIC for large-area silicon photomultipliers for gamma-ray astronomy

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Universitat Politècnica de Catalunya. EFRICS - Efficient and Robust Integrated Circuits and Systems, De Angelis, Nicolas, Gascón Fora, David, Gómez Fernández, Sergio, Heller, Matthieu, Montaruli, Teresa, Nagai, Andrii, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Universitat Politècnica de Catalunya. EFRICS - Efficient and Robust Integrated Circuits and Systems, De Angelis, Nicolas, Gascón Fora, David, Gómez Fernández, Sergio, Heller, Matthieu, Montaruli, Teresa, and Nagai, Andrii

Abstract

Large-area silicon photomultipliers (SiPMs) are desired in many applications where large surfaces have to be covered. For instance, a large area SiPM has been developed by Hamamatsu Photonics in collaboration with the University of Geneva, to equip gamma-ray cameras employed in imaging atmospheric Cherenkov telescopes. The sensor being about 1 cm2, a suitable preamplification electronics has been investigated in this work, which can deal with long pulses induced by the large capacitance of the sensor. The so-called Multiple Use SiPM Integrated Circuit (MUSIC), developed by the ICCUB (University of Barcelona), is investigated as a potential front-end ASIC, suitable to cover large area photodetection planes of gamma-ray telescopes. The ASIC offers an interesting pole-zero cancellation (PZC) that allows dealing with long SiPM signals, the feature of active summation of up to 8 input channels into a single differential output and it can offer a solution for reducing power consumption compared to discrete solutions. Measurements and simulations of MUSIC coupled to two SiPMs developed by Hamamatsu are considered and the ASIC response is characterized., Postprint (published version)

Published
2023

9. Camera Calibration of the CTA-LST prototype

Author

Kobayashi, Yukiho, primary, Okumura, Akira, additional, Cassol, Franca, additional, Katagiri, Hideaki, additional, Sitarek, Julian, additional, Gliwny, Pawel, additional, Nozaki, Seiya, additional, Abe, Hyuga, additional, Aguasca, Arnau, additional, Agudo, Ivan, additional, Antonelli, Lucio Angelo, additional, Aramo, Carla, additional, Armstrong, Thomas, additional, Artero, Manuel, additional, Asano, Katsuaki, additional, Ashkar, Halim, additional, Aubert, Pierre, additional, Baktash, Ali, additional, Bamba, Aya, additional, Baquero Larriva, Andres, additional, Baroncelli, Leonardo, additional, Barres de Almeida, Ulisses, additional, Barrio, Juan Abel, additional, Batković, Ivana, additional, Becerra González, Josefa, additional, Bernardos, Mabel, additional, Berti, Alessio, additional, Biederbeck, Noah, additional, Bigongiari, Ciro, additional, Blanch, Oscar, additional, Bonnoli, Giacomo, additional, Bordas, Pol, additional, Bose, Debanjan, additional, Bulgarelli, Andrea, additional, Burelli, Irene, additional, Buscemi, Mario, additional, Cardillo, Martina, additional, Caroff, Sami, additional, Carosi, Alessandro, additional, Cerruti, Matteo, additional, Chai, Yating, additional, Cheng, Ks, additional, Chikawa, Michiyuki, additional, Chytka, Ladislav, additional, Contreras, Jose Luis, additional, Cortina, Juan, additional, Costantini, Heide, additional, Dalchenko, Mykhailo, additional, De Angelis, Alessandro, additional, de Bony de Lavergne, Mathieu, additional, Deleglise, Guillaume, additional, Delgado, Carlos, additional, Delgado Mengual, Jordi, additional, Della Volpe, Domenico, additional, Depaoli, Davide, additional, Di Pierro, Federico, additional, Di Venere, Leonardo, additional, Díaz, Carlos, additional, Dominik, Rune Michael, additional, Dominis Prester, Dijana, additional, Donini, Alice, additional, Dorner, Daniela, additional, Doro, Michele, additional, Elsässer, Dominik, additional, Emery, Gabriel, additional, Escudero, Juan, additional, Fiasson, Armand, additional, Foffano, Luca, additional, Fonseca, Maria Victoria, additional, Freixas Coromina, Lluis, additional, Fukami, Satoshi, additional, Fukazawa, Yasushi, additional, Garcia, Enrique, additional, Garcia López, Ramon, additional, Giglietto, Nicola, additional, Giordano, Francesco, additional, Godinovic, Nikola, additional, Green, David, additional, Grespan, Pietro, additional, Gunji, Shuichi, additional, Hackfeld, Jonas, additional, Hadasch, Daniela, additional, Hahn, Alexander, additional, Hassan, Tarek, additional, Hayashi, Kohei, additional, Heckmann, Lea, additional, Heller, Matthieu, additional, Herrera Llorente, Javier, additional, Hirotani, Kouichi, additional, Hoffmann, Dirk, additional, Horns, Dieter, additional, Houles, Julien, additional, Hrabovsky, Miroslav, additional, Hrupec, Dario, additional, Hui, David, additional, Hütten, Moritz, additional, Inada, Tomohiro, additional, Inome, Yusuke, additional, Iori, Maurizio, additional, Ishio, Kazuma, additional, Iwamura, Yuki, additional, Jacquemont, Mikael, additional, Jimenez-Martinez, Irene, additional, Jouvin, Léa, additional, Jurysek, Jakub, additional, Kagaya, Mika, additional, Karas, Vladimir, additional, Kataoka, Jun, additional, Kerszberg, Daniel, additional, Kong, Albert, additional, Kubo, Hidetoshi, additional, Kushida, Junko, additional, Lamanna, Giovanni, additional, Lamastra, Alessandra, additional, Le Flour, Thierry, additional, Longo, Francesco, additional, López-Coto, Rubén, additional, López-Moya, Marcos, additional, López-Oramas, Alicia, additional, Luque-Escamilla, Pedro L., additional, Majumdar, Pratik, additional, MAKARIEV, Martin, additional, Mandat, Dusan, additional, Manganaro, Marina, additional, Mannheim, Karl, additional, Mariotti, Mosè, additional, Marquez, Patricia, additional, Marsella, Giovanni, additional, Martí, Josep, additional, Martinez, Oibar, additional, Martínez, Gustavo, additional, Martínez, Manel, additional, Marusevec, Petra, additional, Mas, Alvaro, additional, Maurin, Gilles, additional, Mazin, Daniel, additional, Mestre Guillen, Enrique, additional, Mićanović, Saša, additional, Miceli, Davide, additional, Miener, Tjark, additional, Miranda, Jose Miguel, additional, Miranda, Luis David Medina, additional, Mirzoyan, Razmik, additional, Mizuno, Tsunefumi, additional, Molina, Edgar, additional, Montaruli, Teresa, additional, Monteiro, Inocencio, additional, Moralejo, Abelardo, additional, Morcuende, Daniel, additional, Moretti, Elena, additional, Morselli, Aldo, additional, Mrakovcic, Karlo, additional, Murase, Kohta, additional, Nagai, Andrii, additional, Nakamori, Takeshi, additional, Nickel, Lukas, additional, Nieto, Daniel, additional, Nievas, Mireia, additional, Nishijima, Kyoshi, additional, Noda, Koji, additional, Nosek, Dalibor, additional, Nöthe, Maximilian, additional, Ohishi, Michiko, additional, Ohtani, Yoshiki, additional, Oka, Tomohiko, additional, Okazaki, Nao, additional, Orito, Reiko, additional, Otero-Santos, Jorge, additional, Palatiello, Michele, additional, Paneque, David, additional, Paoletti, Riccardo, additional, Paredes, Josep Maria, additional, Pavletić, Lovro, additional, Pech, Miroslav, additional, Pecimotika, Mario, additional, Poireau, Vincent, additional, Polo, Miguel, additional, Prandini, Elisa, additional, Prast, Julie, additional, Priyadarshi, Chaitanya, additional, Prouza, Michael, additional, Rando, Riccardo, additional, Rhode, Wolgang, additional, Ribó, Marc, additional, Rizi, Vincenzo, additional, Rugliancich, Andrea, additional, Ruiz, Jose Enrique, additional, Saito, Takayuki, additional, Sakurai, Shunsuke, additional, Sanchez, David, additional, Šarić, Toni, additional, Saturni, Francesco Gabriele, additional, Scherpenberg, Juliane, additional, Schleicher, Bernd, additional, Schubert, Jan Lukas, additional, Schüssler, Fabian, additional, Schweizer, Thomas, additional, Seglar Arroyo, Monica, additional, Shellard, Ronald Cintra, additional, Sliusar, Vitalii, additional, Spolon, Alessia, additional, Strišković, Jelena, additional, Strzys, Marcel C., additional, Suda, Yusuke, additional, Sunada, Yuji, additional, Tajima, Hiroyasu, additional, Takahashi, Mitsunari, additional, Takahashi, Hiromitsu, additional, Takata, Jumpei, additional, Takeishi, Ryuji, additional, Tam, P. Thomas, additional, Tanaka, Shuta, additional, Tateishi, Dai, additional, Tejedor, Luis Ángel, additional, Temnikov, Petar, additional, Terada, Yukikatsu, additional, Terzic, Tomislav, additional, Teshima, Masahiro, additional, Tluczykont, Martin, additional, Tokanai, Fuyuki, additional, Torres, Diego F., additional, Travnicek, Petr, additional, Truzzi, Stefano, additional, Vacula, Martin, additional, VAZQUEZ ACOSTA, Monica, additional, VERGUILOV, Vassil, additional, Verna, Gaia, additional, Viale, Ilaria, additional, Vigorito, Carlo francesco, additional, Vitale, Vincenzo, additional, Vovk, Ievgen, additional, Vuillaume, Thomas, additional, Walter, Roland, additional, Will, Martin, additional, Yamamoto, Tokonatsu, additional, Yamazaki, Ryo, additional, Yoshida, Tatsuo, additional, Yoshikoshi, Takanori, additional, and Zarić, Darko, additional

Published
2021
Full Text
View/download PDF

11. Calibration and operation of SiPM-based cameras for gamma-ray astronomy in presence of high night-sky light

Author

Alispach, Cyril Martin, primary, Al Samarai, Imen, additional, Balbo, Matteo, additional, Barbano, Anastasia Maria, additional, Beshley, Vasyl, additional, Biland, Adrian, additional, Blazek, Jiri, additional, Błocki, Jacek, additional, Borkowski, Jerzy, additional, Bulik, Tomek, additional, Cadoux, Frank Raphael, additional, Chytka, Ladislav, additional, Coco, Victor, additional, De Angelis, Nicolas, additional, Della Volpe, Domenico, additional, Favre, Yannick, additional, Gieras, Tomasz, additional, Grudzińska, Mira, additional, Hamal, Petr, additional, Heller, Matthieu, additional, Hrabovsky, Miroslav, additional, Jurysek, Jakub, additional, Kasperek, Jerzy, additional, Koncewicz, Katarzyna, additional, Kotarba, Andrzej, additional, Lyard, Étienne, additional, Mach, Emil, additional, Mandat, Dusan, additional, Michal, Stanislav, additional, Michałowski, Jerzy, additional, Moderski, Rafal, additional, Montaruli, Teresa, additional, Nagai, Andrii, additional, Neise, Dominik, additional, Niemiec, Jacek, additional, Njoh Ekoume, Theodore Rodrigue, additional, Ostrowski, Michal, additional, Palatka, Miroslav, additional, Paśko, Paweł, additional, Pech, Miroslav, additional, Pilszyk, Bartłomiej, additional, Przybilski, Henry, additional, Rajda, Paweł, additional, Renier, Yves, additional, Rozwadowski, Paweł, additional, Schovanek, Petr, additional, Seweryn, Karol, additional, Sliusar, Vitali, additional, Smakulska, Dorota, additional, Sobczyńska, Dorota, additional, Stawarz, Łukasz, additional, Świerblewski, Jacek, additional, Świerk, Paweł, additional, Travnicek, Petr, additional, Troyano Pujadas, Isaac, additional, Walter, Roland, additional, Wiecek, Marek, additional, Zagdański, Aleksander, additional, and Ziȩtara, Krzysztof, additional

Published
2019
Full Text
View/download PDF

14. Etude des détecteurs SiPM jusqu’aux températures cryogéniques et pour une application biomédicale

Author

Nagai, Andrii, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Imagerie et Modélisation en Neurobiologie et Cancérologie (IMNC (UMR_8165)), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Fermi National Accelerator Laboratory (Fermilab), Université Paris Saclay (COmUE), Nicoleta Dinu-Jaeger, Université Paris-Saclay, and STAR, ABES

Subjects
IV model, Modèle IV, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Cryogenic, SiPM, Biomedical application, Cryogénique, Application biomédicale, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

Silicon PhotoMultiplier (SiPM) detector has become a suitable visible light/photon detector for many applications like high energy physics and neutrino experiments, fluorescence detection, bio-photonics and medical imaging. The first part of my thesis was oriented to the studies of SiPM physics parameters as a function of temperature. Particularly, recent KETEK devices (year 2015) with different technological characteristics like p/n and n/p junctions, with and without trench technology, and different widths of epitaxial layer were studied in the temperature range from 308.15 K (+35°C) down to 238.15 K (-35°C). In addition, the Hamamatsu devices from 2011 production run as well as new devices from 2015 year, with improved technological characteristics inducing a reduced noise, were investigated in a wider temperature range from 318.15 K (+45°C) down to 98.15 K (-175°C). For these purposes, I participated to the design, installation, commissioning and calibration of a cryogenic experimental setup dedicated to electrical, optical and temperature studies of SiPM devices. Also, I have developed an automatic analysis procedure able to handle in a short time an impressive quantity of experimental data (i.e. tens of Gb/device) and to give a precise and fast information on main SiPM parameters and their temperature dependence. I have also developed a physical modeldescribing the DC I-V curves of SiPM detectors at different temperatures. The proposed model fits well the shape of IV curve in a very large currents range from 10⁻¹² A up to 10⁻⁵ A over the full working range of various devices. Consequently, the IV model can be used as a simple and fast method for determination of SiPM parameters like breakdown voltage VBD, the shape of Geiger triggering probability PGeiger as a function of Vbias as well as the Vbias working range. The comparison of these parameters with those calculated from AC measurements and analyzed by the automatic procedure showed a good agreement. The second part of my thesis was oriented to the study of SiPM devices and their physical parameters required to build a prototype of betasensitive intracerebral probe. Such probe is dedicated to measure the local concentration of radiolabeled molecules on awake and freely moving animal and to study new animal models of human disorders (neurodegenerative diseases, tumor growth, and neuropsychiatric disorders). It is composed of small size, low-noise SiPM device coupled to a scintillating fiber and readout by a dedicated miniaturized low-power consumption electronics. Three SiPM devices have been chosen as the most adapted for our application: two small KETEK devices of 0.5×0.5 mm² size (with and without optical trenches, specially developed by KETEK to fulfill our requirements) and a standard Hamamatsu device of 1.3×1.3 mm² size, all devices having 50 × 50 μm² μcell size. For each SiPM the gain G, dark count rate DCR and beta sensitivity were measured as a function of Vbias and temperature. The obtained results showed that the small field of view and newly developed structure of the KETEK devices allow a large decrease of the dark count rate DCR. However, this small field of view also leads to a reduced light collection due to the thickness of the epoxy protection resin on top of the SiPM and the acceptance angle of the fiber. Since the beta sensitivity represents a tradeoff between photon detection efficiency PDE and dark count rate DCR, KETEK SiPMs exhibit similar performances in comparison with the Hamamatsu device. Preliminary results demonstrate that the beta sensitivity of KETEK devices can be significantly improved by using focusing lens between the scintillating fiber and the SiPM or by reducing the thickness of its epoxy protection resin., Les Photomultiplicateurs Silicium (SiPM) sont devenus aujourd’hui des détecteurs de lumière visible, applicables dans de nombreux domaines comme la Physique des Hautes Énergies, les expériences Neutrinos, la détection de fluorescence, pour des applications de biophotonique ou d’imagerie médicale. La première partie de ma thèse concerne l’étude des divers paramètres physiques des SiPM en fonction de température T. En particulier, des composants récents (2015) de KETEK ayant diverses caractéristiques technologiques comme des jonctions p/n ou n/p, avec ou sans « trench » entre cellules, différentes épaisseurs de couches épitaxiales, etc… ont été étudiés dans la gamme de T de 308.15 K (+35°C) à 238.15 K (-35°C). En plus, des composants Hamamatsu de production 2011, ainsi que de production 2015 avec des caractéristiques technologiques améliorées (faible bruit), ont été testés dans la gamme 318.15 K (+45°C) à 98.15 K (-175°C). Pour ces études, j’ai participé à la conception, l’installation, la mise en service et la calibration d’un banc cryogénique destiné aux caractérisations électriques, optiques, et en température, des SiPM. J’ai développé une procédure d’analyse automatisée, capable de traiter en un temps très court une énorme quantité de données expérimentales (i.e. dizaines de Gb/détecteur), et de fournir une information rapide et précise sur les principaux paramètres et leur dépendance en T. J’ai développé un modèle physique décrivant les courbes IV en DC pour différentes T. Ce modèle proposé reproduit bien la forme de la courbe IV dans une large gamme de courants allant de 10⁻¹² à 10⁻⁵ A sur toute la zone de fonctionnement des divers détecteurs. Ainsi, le modèle IV peut être utilisé comme un outil simple et rapide pour déterminer les paramètres du SiPM comme le VBD, la forme de la courbe PGeiger en fonction de Vbias, ainsi que la plage des tensions de fonctionnement. La comparaison de ces paramètres avec ceux obtenus en mesure AC, et analysés par la procédure automatisée, sont en bonne concordance. La seconde partie de ma thèse a porté sur l’étude de composants SiPM spécialement adaptés à une application biomédicale. Il s’agit d’une sonde intracérébrale, sensible à l’émission β (Nβ) de molécules marquées par un traceur radioactif, injectées dans le cerveau d’un animal vivant. Le but étant de construire un nouveau "modèle animal" de maladies humaines telles que les maladies neuro-dégénératives ou neuropsychiatriques et la croissance de tumeurs. Cette sonde se compose d’un SiPM de très petite taille, bas bruit, couplé à une fibre scintillante, suivie d’une électronique de lecture spécifique, miniaturisée, à faible consommation. Ces SiPM ont été choisis comme les plus adaptés à notre application : deux SiPM de KETEK de 0.5x0.5 mm² (spécialement développés par cette compagnie pour nos besoins), et un SiPM standard de 1.3x1.3 mm² de Hamamatsu, tous ayant des μ-cellules de 50 × 50 μm². Pour chaque composant, les paramètres G, DCR et la sensibilité β ont été mesurés en fonction de Vbias et T. Les résultats obtenus montrent que le faible champ de vue des nouvelles structures KETEK permet une bonne amélioration du DCR. Cependant ce faible champ de vue entraîne une perte de collection de lumière due à l’épaisseur de la couche de résine époxy de protection, et à l’angle d’acceptante de la fibre. Comme la sensibilité β est un compromis entre le PDE et le DCR, les SiPM de KETEK montrent au final des performances voisines de celles de Hamamatsu. Les résultats préliminaires démontrent que la sensibilité β de KETEK peut être améliorée significativement en utilisant une lentille de focalisation entre la fibre scintillante et le SiPM, ou en diminuant l’épaisseur de la couche de résine époxy de protection.

Published
2016

15. First light on a new fully digital camera based on SiPM for CTA SST-1M telescope

Author

Schovánek, Petr, primary, Rajda, Pawel J., primary, della Volpe, Domenico, primary, Montaruli, Teresa, primary, Heller, Matthieu, primary, Coco, Victor, primary, Al Samarai, Imen, primary, Cadoux, Franck, primary, Favre, Yannick, primary, Alispach, Cyril, primary, Troyano Pujadas, Isaac, primary, Nagai, Andrii, primary, Njoh Ekoume, Theodore R., primary, Walter, Roland, primary, Lyard, Etienne, primary, Neronov, Andrii, primary, Sliusar, Vitalii, primary, Niemiec, Jacek, primary, Mach, Emil, primary, Michalowski, Jerzy, primary, Rafalski, Jakub, primary, Skowron, Krzysztof, primary, Stodulska, Magdalena, primary, Stodulski, Marek, primary, Jamrozy, Marek, primary, Ostrowski, Michal, primary, Stawarz, Lukasz, primary, Zietara, Krzysztof, primary, Borkowski, Jerzy, primary, Moderski, Rafal, primary, Bulik, Tomasz, primary, Grudzińska, Mira, primary, Paśko, Pawel, primary, Seweryn, Karol, primary, Mandat, Dusan, primary, Pech, Miroslav, primary, Kasperek, Jerzy, primary, and Travnicek, Petr, primary

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results