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134 results on '"Alexandrov, I. A."'

1. Characterization of the ambient background in the RED-100 experiment location at Kalinin Nuclear Power Plant

Author

Akimov, D. Y., Alexandrov, I. S., Belov, V. A., Bolozdynya, A. I., Etenko, A. V., Galavanov, A. V., Gusakov, Yu. V., Khromov, A. V., Konovalov, A. M., Kornoukhov, V. N., Kovalenko, A. G., Kozlova, E. S., Kumpan, A. V., Lavrov, B. O., Lukyashin, A. V., Pinchuk, A. V., Razuvaeva, O. E., Rudik, D. G., Shakirov, A. V., Simakov, G. E., Sosnovtsev, V. V., and Vasin, A. A.

Subjects
Physics - Instrumentation and Detectors
Abstract

The RED-100 experiment with a liquid xenon target was carried out at Kalinin Nuclear Power Plant. The goal of the experiment is the detection and study of the coherent elastic neutrino nucleus scattering process (CE$\nu$NS) for the low-energy antineutrinos in close vicinity to a reactor core. A good understanding of the external radioactive background is needed to achieve this goal. This paper describes the external background conditions for the RED-100 experiment at Kalinin Nuclear Power Plant., Comment: 16 pages, 12 figures, (minor changes in the text for clarity)

Published
2023

3. The RED-100 experiment

Author

Akimov, D. Yu., Alexandrov, I. S., Alyev, R. R., Belov, V. A., Bolozdynya, A. I., Etenko, A. V., Galavanov, A. V., Glagovsky, E. M., Gusakov, Y. V., Khromov, A. V., Kiselev, S. M., Konovalov, A. M., Kornoukhov, V. N., Kovalenko, A. G., Kozlova, E. S., Kumpan, A. V., Lukyashin, A. V., Pinchuk, A. V., Razuvaeva, O. E., Rudik, D. G., Shakirov, A. V., Simakov, G. E., Sosnovtsev, V. V., and Vasin, A. A.

Subjects
Physics - Instrumentation and Detectors
Abstract

The RED-100 two-phase xenon emission detector has been deployed at 19-m distance from the reactor core of the Kalinin Nuclear Power Plant (KNPP) in 2021 - 2022 for investigation of the possibility to observe reactor antineutrinos using the effect of coherent elastic neutrino-nucleus scattering (CE{\nu}NS). The performance of the main systems of the RED-100 setup at operating nuclear power plant is described. There is no correlation of the radioactive background at the experimental setup site with ON and OFF states of the reactor. The data taking run was carried out at the beginning of the year 2022 and covered both the reactor OFF and ON periods., Comment: 17 pages, 9 figures, submitted to JINST

Published
2022
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5. Challenges in QCD matter physics - The Compressed Baryonic Matter experiment at FAIR

Author

CBM Collaboration, Ablyazimov, T., Abuhoza, A., Adak, R. P., Adamczyk, M., Agarwal, K., Aggarwal, M. M., Ahammed, Z., Ahmad, F., Ahmad, N., Ahmad, S., Akindinov, A., Akishin, P., Akishina, E., Akishina, T., Akishina, V., Akram, A., Al-Turany, M., Alekseev, I., Alexandrov, E., Alexandrov, I., Amar-Youcef, S., Anđelić, M., Andreeva, O., Andrei, C., Andronic, A., Anisimov, Yu., Appelshäuser, H., Argintaru, D., Atkin, E., Avdeev, S., Averbeck, R., Azmi, M. D., Baban, V., Bach, M., Badura, E., Bähr, S., Balog, T., Balzer, M., Bao, E., Baranova, N., Barczyk, T., Bartoş, D., Bashir, S., Baszczyk, M., Batenkov, O., Baublis, V., Baznat, M., Becker, J., Becker, K. -H., Belogurov, S., Belyakov, D., Bendarouach, J., Berceanu, I., Bercuci, A., Berdnikov, A., Berdnikov, Y., Berendes, R., Berezin, G., Bergmann, C., Bertini, D., Bertini, O., Beşliu, C., Bezshyyko, O., Bhaduri, P. P., Bhasin, A., Bhati, A. K., Bhattacharjee, B., Bhattacharyya, A., Bhattacharyya, T. K., Biswas, S., Blank, T., Blau, D., Blinov, V., Blume, C., Bocharov, Yu., Book, J., Breitner, T., Brüning, U., Brzychczyk, J., Bubak, A., Büsching, H., Bus, T., Butuzov, V., Bychkov, A., Byszuk, A., Cai, Xu, Cálin, M., Cao, Ping, Caragheorgheopol, G., Carević, I., Cătănescu, V., Chakrabarti, A., Chattopadhyay, S., Chaus, A., Chen, Hongfang, Chen, LuYao, Cheng, Jianping, Chepurnov, V., Cherif, H., Chernogorov, A., Ciobanu, M. I., Claus, G., Constantin, F., Csanád, M., D'Ascenzo, N., Das, Supriya, Das, Susovan, de Cuveland, J., Debnath, B., Dementiev, D., Deng, Wendi, Deng, Zhi, Deppe, H., Deppner, I., Derenovskaya, O., Deveaux, C. A., Deveaux, M., Dey, K., Dey, M., Dillenseger, P., Dobyrn, V., Doering, D., Dong, Sheng, Dorokhov, A., Dreschmann, M., Drozd, A., Dubey, A. K., Dubnichka, S., Dubnichkova, Z., Dürr, M., Dutka, L., Dželalija, M., Elsha, V. V., Emschermann, D., Engel, H., Eremin, V., Eşanu, T., Eschke, J., Eschweiler, D., Fan, Huanhuan, Fan, Xingming, Farooq, M., Fateev, O., Feng, Shengqin, Figuli, S. P. D., Filozova, I., Finogeev, D., Fischer, P., Flemming, H., Förtsch, J., Frankenfeld, U., Friese, V., Friske, E., Fröhlich, I., Frühauf, J., Gajda, J., Galatyuk, T., Gangopadhyay, G., Chávez, C. García, Gebelein, J., Ghosh, P., Ghosh, S. K., Gläßel, S., Goffe, M., Golinka-Bezshyyko, L., Golovatyuk, V., Golovnya, S., Golovtsov, V., Golubeva, M., Golubkov, D., Ramírez, A. Gómez, Gorbunov, S., Gorokhov, S., Gottschalk, D., Gryboś, P., Grzeszczuk, A., Guber, F., Gudima, K., Gumiński, M., Gupta, A., Gusakov, Yu., Han, Dong, Hartmann, H., He, Shue, Hehner, J., Heine, N., Herghelegiu, A., Herrmann, N., Heß, B., Heuser, J. M., Himmi, A., Höhne, C., Holzmann, R., Hu, Dongdong, Huang, Guangming, Huang, Xinjie, Hutter, D., Ierusalimov, A., Ilgenfritz, E. -M., Irfan, M., Ivanischev, D., Ivanov, M., Ivanov, P., Ivanov, Valery, Ivanov, Victor, Ivanov, Vladimir, Ivashkin, A., Jaaskelainen, K., Jahan, H., Jain, V., Jakovlev, V., Janson, T., Jiang, Di, Jipa, A., Kadenko, I., Kähler, P., Kämpfer, B., Kalinin, V., Kallunkathariyil, J., Kampert, K. -H., Kaptur, E., Karabowicz, R., Karavichev, O., Karavicheva, T., Karmanov, D., Karnaukhov, V., Karpechev, E., Kasiński, K., Kasprowicz, G., Kaur, M., Kazantsev, A., Kebschull, U., Kekelidze, G., Khan, M. M., Khan, S. A., Khanzadeev, A., Khasanov, F., Khvorostukhin, A., Kirakosyan, V., Kirejczyk, M., Kiryakov, A., Kiš, M., Kisel, I., Kisel, P., Kiselev, S., Kiss, T., Klaus, P., Kłeczek, R., Klein-Bösing, Ch., Kleipa, V., Klochkov, V., Kmon, P., Koch, K., Kochenda, L., Koczoń, P., Koenig, W., Kohn, M., Kolb, B. W., Kolosova, A., Komkov, B., Korolev, M., Korolko, I., Kotte, R., Kovalchuk, A., Kowalski, S., Koziel, M., Kozlov, G., Kozlov, V., Kramarenko, V., Kravtsov, P., Krebs, E., Kreidl, C., Kres, I., Kresan, D., Kretschmar, G., Krieger, M., Kryanev, A. V., Kryshen, E., Kuc, M., Kucewicz, W., Kucher, V., Kudin, L., Kugler, A., Kumar, Ajit, Kumar, Ashwini, Kumar, L., Kunkel, J., Kurepin, A., Kurepin, N., Kurilkin, A., Kurilkin, P., Kushpil, V., Kuznetsov, S., Kyva, V., Ladygin, V., Lara, C., Larionov, P., García, A. Laso, Lavrik, E., Lazanu, I., Lebedev, A., Lebedev, S., Lebedeva, E., Lehnert, J., Lehrbach, J., Leifels, Y., Lemke, F., Li, Cheng, Li, Qiyan, Li, Xin, Li, Yuanjing, Lindenstruth, V., Linnik, B., Liu, Feng, Lobanov, I., Lobanova, E., Löchner, S., Loizeau, P. -A., Lone, S. A., Martínez, J. A. Lucio, Luo, Xiaofeng, Lymanets, A., Lyu, Pengfei, Maevskaya, A., Mahajan, S., Mahapatra, D. P., Mahmoud, T., Maj, P., Majka, Z., Malakhov, A., Malankin, E., Malkevich, D., Malyatina, O., Malygina, H., Mandal, M. M., Mandal, S., Manko, V., Manz, S., Garcia, A. M. Marin, Markert, J., Masciocchi, S., Matulewicz, T., Meder, L., Merkin, M., Mialkovski, V., Michel, J., Miftakhov, N., Mik, L., Mikhailov, K., Mikhaylov, V., Milanović, B., Militsija, V., Miskowiec, D., Momot, I., Morhardt, T., Morozov, S., Müller, W. F. J., Müntz, C., Mukherjee, S., Castillo, C. E. Muńoz, Murin, Yu., Najman, R., Nandi, C., Nandy, E., Naumann, L., Nayak, T., Nedosekin, A., Negi, V. S., Niebur, W., Nikulin, V., Normanov, D., Oancea, A., Oh, Kunsu, Onishchuk, Yu., Ososkov, G., Otfinowski, P., Ovcharenko, E., Pal, S., Panasenko, I., Panda, N. R., Parzhitskiy, S., Patel, V., Pauly, C., Penschuck, M., Peshekhonov, D., Peshekhonov, V., Petráček, V., Petri, M., Petriş, M., Petrovici, A., Petrovici, M., Petrovskiy, A., Petukhov, O., Pfeifer, D., Piasecki, K., Pieper, J., Pietraszko, J., Płaneta, R., Plotnikov, V., Plujko, V., Pluta, J., Pop, A., Pospisil, V., Poźniak, K., Prakash, A., Prasad, S. K., Prokudin, M., Pshenichnov, I., Pugach, M., Pugatch, V., Querchfeld, S., Rabtsun, S., Radulescu, L., Raha, S., Rami, F., Raniwala, R., Raniwala, S., Raportirenko, A., Rautenberg, J., Rauza, J., Ray, R., Razin, S., Reichelt, P., Reinecke, S., Reinefeld, A., Reshetin, A., Ristea, C., Ristea, O., Rodriguez, A. Rodriguez, Roether, F., Romaniuk, R., Rost, A., Rostchin, E., Rostovtseva, I., Roy, Amitava, Roy, Ankhi, Rożynek, J., Ryabov, Yu., Sadovsky, A., Sahoo, R., Sahu, P. K., Sahu, S. K., Saini, J., Samanta, S., Sambyal, S. S., Samsonov, V., Rosado, J. Sánchez, Sander, O., Sarangi, S., Satława, T., Sau, S., Saveliev, V., Schatral, S., Schiaua, C., Schintke, F., Schmidt, C. J., Schmidt, H. R., Schmidt, K., Scholten, J., Schweda, K., Seck, F., Seddiki, S., Selyuzhenkov, I., Semennikov, A., Senger, A., Senger, P., Shabanov, A., Shabunov, A., Shao, Ming, Sheremetiev, A. D., Shi, Shusu, Shumeiko, N., Shumikhin, V., Sibiryak, I., Sikora, B., Simakov, A., Simon, C., Simons, C., Singaraju, R. N., Singh, A. K., Singh, B. K., Singh, C. P., Singhal, V., Singla, M., Sitzmann, P., Siwek-Wilczyńska, K., Škoda, L., Skwira-Chalot, I., Som, I., Song, Guofeng, Song, Jihye, Sosin, Z., Soyk, D., Staszel, P., Strikhanov, M., Strohauer, S., Stroth, J., Sturm, C., Sultanov, R., Sun, Yongjie, Svirida, D., Svoboda, O., Szabó, A., Szczygieł, R., Talukdar, R., Tang, Zebo, Tanha, M., Tarasiuk, J., Tarassenkova, O., Târzilă, M. -G., Teklishyn, M., Tischler, T., Tlustý, P., Tölyhi, T., Toia, A., Topil'skaya, N., Träger, M., Tripathy, S., Tsakov, I., Tsyupa, Yu., Turowiecki, A., Tuturas, N. G., Uhlig, F., Usenko, E., Valin, I., Varga, D., Vassiliev, I., Vasylyev, O., Verbitskaya, E., Verhoeven, W., Veshikov, A., Visinka, R., Viyogi, Y. P., Volkov, S., Volochniuk, A., Vorobiev, A., Voronin, Aleksey, Voronin, Alexander, Vovchenko, V., Vznuzdaev, M., Wang, Dong, Wang, Xi-Wei, Wang, Yaping, Wang, Yi, Weber, M., Wendisch, C., Wessels, J. P., Wiebusch, M., Wiechula, J., Wielanek, D., Wieloch, A., Wilms, A., Winckler, N., Winter, M., Wiśniewski, K., Wolf, Gy., Won, Sanguk, Wu, Ke-Jun, Wüstenfeld, J., Xiang, Changzhou, Xu, Nu, Yang, Junfeng, Yang, Rongxing, Yin, Zhongbao, Yoo, In-Kwon, Yuldashev, B., Yushmanov, I., Zabołotny, W., Zaitsev, Yu., Zamiatin, N. I., Zanevsky, Yu., Zhalov, M., Zhang, Yifei, Zhang, Yu, Zhao, Lei, Zheng, Jiajun, Zheng, Sheng, Zhou, Daicui, Zhou, Jing, Zhu, Xianglei, Zinchenko, A., Zipper, W., Żoładź, M., Zrelov, P., Zryuev, V., Zumbruch, P., and Zyzak, M.

Subjects
Nuclear Experiment
Abstract

Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (mu_B > 500 MeV), effects of chiral symmetry, and the equation-of-state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2022, in the context of the worldwide efforts to explore high-density QCD matter., Comment: 15 pages, 11 figures. Published in European Physical Journal A

Published
2016
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6. Challenges in QCD matter physics --The scientific programme of the Compressed Baryonic Matter experiment at FAIR

Author

Ablyazimov, T, Abuhoza, A, Adak, RP, Adamczyk, M, Agarwal, K, Aggarwal, MM, Ahammed, Z, Ahmad, F, Ahmad, N, Ahmad, S, Akindinov, A, Akishin, P, Akishina, E, Akishina, T, Akishina, V, Akram, A, Al-Turany, M, Alekseev, I, Alexandrov, E, Alexandrov, I, Amar-Youcef, S, Anđelić, M, Andreeva, O, Andrei, C, Andronic, A, Anisimov, Yu, Appelshäuser, H, Argintaru, D, Atkin, E, Avdeev, S, Averbeck, R, Azmi, MD, Baban, V, Bach, M, Badura, E, Bähr, S, Balog, T, Balzer, M, Bao, E, Baranova, N, Barczyk, T, Bartoş, D, Bashir, S, Baszczyk, M, Batenkov, O, Baublis, V, Baznat, M, Becker, J, Becker, K-H, Belogurov, S, Belyakov, D, Bendarouach, J, Berceanu, I, Bercuci, A, Berdnikov, A, Berdnikov, Y, Berendes, R, Berezin, G, Bergmann, C, Bertini, D, Bertini, O, Beşliu, C, Bezshyyko, O, Bhaduri, PP, Bhasin, A, Bhati, AK, Bhattacharjee, B, Bhattacharyya, A, Bhattacharyya, TK, Biswas, S, Blank, T, Blau, D, Blinov, V, Blume, C, Bocharov, Yu, Book, J, Breitner, T, Brüning, U, Brzychczyk, J, Bubak, A, Büsching, H, Bus, T, Butuzov, V, Bychkov, A, Byszuk, A, Cai, Xu, Cãlin, M, Cao, Ping, Caragheorgheopol, G, Carević, I, Cătănescu, V, Chakrabarti, A, Chattopadhyay, S, Chaus, A, Chen, Hongfang, Chen, LuYao, Cheng, Jianping, Chepurnov, V, Cherif, H, and Chernogorov, A

Subjects
nucl-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sNN= 2.7--4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (μB> 500 MeV), effects of chiral symmetry, and the equation of state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2024, in the context of the worldwide efforts to explore high-density QCD matter.

Published
2017

7. Experimental study of ionization yield of liquid xenon for electron recoils in the energy range 2.8 - 80 keV

Author

Akimov, D. Yu., Afanasyev, V. V., Alexandrov, I. S., Belov, V. A., Bolozdynya, A. I., Burenkov, A. A., Efremenko, Yu. V., Egorov, D. A., Etenko, A. V., Gulin, M. A., Ivakhin, S. V., Kaplin, V. A., Karelin, A. K., Khromov, A. V., Kirsanov, M. A., Klimanov, S. G., Kobyakin, A. S., Konovalov, A. M., Kovalenko, A. G., Kuchenkov, A. V., Kumpan, A. V., Melikyan, Yu. A., Nikolaev, R. I., Rudik, D. G., Sosnovtsev, V. V., and Stekhanov, V. N.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

We present the results of the first experimental study of ionization yield of electron recoils with energies below 100 keV produced in liquid xenon by the isotopes: 37Ar, 83mKr, 241Am, 129Xe, 131Xe. It is confirmed by a direct measurement with 37Ar isotope (2.82 keV) that the ionization yield is growing up with the energy decrease in the energy range below ~ 10 keV accordingly to the NEST predictions. Decay time of scintillation at 2.82 keV is measured to be 25 +/- 3 ns at the electric field of 3.75 kV/cm., Comment: 16 pages, 8 figures

Published
2014
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8. Two-phase xenon emission detector with electron multiplier and optical readout by multipixel avalanche Geiger photodiodes

Author

Akimov, D. Yu., Akindinov, A. V., Alexandrov, I. S., Belov, V. A., Bolozdynya, A. I., Burenkov, A. A., Buzulutskov, A. F., Danilov, M. V., Efremenko, Yu. V., Kirsanov, M. A., Kovalenko, A. G., and Stekhanov, V. N.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

A successful operation of a new optical readout system (THGEM + WLS + MGPDs (multichannel array of multipixel avalanche Geiger photodiodes) in a two-phase liquid xenon detector was demonstrated.

Published
2013
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9. Perspectives to measure neutrino-nuclear neutral current coherent scattering with two-phase emission detector

Author

RED Collaboration, Akimov, D. Yu., Alexandrov, I. S., Aleshin, V. I., Belov, V. A., Bolozdynya, A. I., Burenkov, A. A., Chepurnov, A. S., Danilov, M. V., Derbin, A. V., Dmitrenko, V. V., Dolgolenko, A. G., Egorov, D. A., Efremenko, Yu. V., Etenko, A. V., Gromov, M. B., Gulin, M. A., Ivakhin, S. V., Kantserov, V. A., Kaplin, V. A., Karelin, A. K., Khromov, A. V., Kirsanov, M. A., Klimanov, S. G., Kobyakin, A. S., Konovalov, A. M., Kovalenko, A. G., Kopeikin, V. I., Krakhmalova, T. D., Kuchenkov, A. V., Kumpan, A. V., Litvinovich, E. A., Lukyanchenko, G. A, Machulin, I. N., Martemyanov, V. P., Nurakhov, N. N., Rudik, D. G., Saldikov, I. S., Skorokhatov, M. D., Sosnovtsev, V. V., Stekhanov, V. N., Strikhanov, M. N., Sukhotin, S. V., Tarasenkov, V. G., Tikhomirov, G. V., and Zeldovich, O. Ya.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-phase emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: Kalinin Nuclear Power Plant in the Russian Federation and Spallation Neutron Source at the Oak Ridge National Laboratory in the USA. Both sites have advantages as well as limitations. However the experiment looks feasible at either location. Preliminary design of the detector and supporting R&D program are discussed., Comment: 16 pages, 10 figures, RED collaboration

Published
2012
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10. On the low-temperature performances of THGEM and THGEM/G-APD multipliers in gaseous and two-phase Xe

Author

Bondar, A., Buzulutskov, A., Grebenuk, A., Shemyakina, E., Sokolov, A., Akimov, D., Alexandrov, I., and Breskin, A.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The performances of THGEM multipliers in two-phase Xe avalanche mode are presented for the first time. Additional results on THGEM operation in gaseous Xe at cryogenic temperatures are provided. Stable operation of a double-THGEM multiplier was demonstrated in two-phase Xe with gains reaching 600. These are compared to existing data, summarized here for two-phase Ar, Kr and Xe avalanche detectors incorporating GEM and THGEM multipliers. The optical readout of THGEMs with Geiger-mode Avalanche Photodiodes (G-APDs) has been investigated in gaseous Xe at cryogenic temperature; avalanche scintillations were recorded in the Near Infrared (NIR) at wavelengths of up to 950 nm. At avalanche charge gain of 350, the double-THGEM/G-APD multiplier yielded 0.07 photoelectrons per initial ionization electron, corresponding to an avalanche scintillation yield of 0.7 NIR photons per avalanche electron over 4pi. The results are compared with those of two-phase Ar avalanche detectors. The advantages, limitations and possible applications are discussed., Comment: 22 pages, 14 figures. Revised Figs. 10,11 and Table 1. To be published in JINST

Published
2011
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11. Direct observation of avalanche scintillations in a THGEM-based two-phase Ar avalanche detector using Geiger-mode APD

Author

Bondar, A., Buzulutskov, A., Grebenuk, A., Sokolov, A., Akimov, D., Alexandrov, I., and Breskin, A.

Subjects
Physics - Instrumentation and Detectors
Abstract

A novel concept of optical signal recording in two-phase avalanche detectors, with Geiger-mode Avalanche Photodiodes (G-APD) is described. Avalanche-scintillation photons were measured in a thick Gas Electron Multiplier (THGEM) in view of potential applications in rare-event experiments. The effective detection of avalanche scintillations in THGEM holes has been demonstrated in two-phase Ar with a bare G-APD without wavelength shifter, i.e. insensitive to VUV emission of Ar. At gas-avalanche gain of 400 and under \pm 70^\circ viewing-angle, the G-APD yielded 640 photoelectrons (pe) per 60 keV X-ray converted in liquid Ar; this corresponds to 0.7 pe per initial (prior to multiplication) electron. The avalanche-scintillation light yield measured by the G-APD was about 0.7 pe per avalanche electron, extrapolated to 4pi acceptance. The avalanche scintillations observed occurred presumably in the near infrared (NIR) where G-APDs may have high sensitivity. The measured scintillation yield is similar to that observed by others in the VUV. Other related topics discussed in this work are the G-APD's single-pixel and quenching resistor characteristics at cryogenic temperatures., Comment: 21 pages, 18 figures. Submitted to JINST

Published
2010
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12. Geiger Mode APD performance in a cryogenic two-phase Ar avalanche detector based on THGEMs

Author

Bondar, A., Buzulutskov, A., Grebenuk, A., Sokolov, A., Akimov, D., Alexandrov, I., and Breskin, A.

Subjects
Physics - Instrumentation and Detectors
Abstract

Characteristic properties of a Geiger Mode APD (G-APD) in a THGEM-based cryogenic two-phase Ar avalanche detector were studied in view of potential applications in rare-event experiments. G-APD signal amplitude and noise characteristics at cryogenic temperatures turned out to be superior to those at room temperature. The effective detection of avalanche scintillations from THGEM-multiplier holes in two-phase Ar has been demonstrated using a G-APD without wavelength shifter. At an avalanche gain of 60, the avalanche scintillation yield measured by the G-APD was as high as 0.9 photoelectrons per avalanche electron, extrapolated to 4pi acceptance., Comment: 4 pages, 8 figures. Presented at Vienna Conference on Instrumentation (Feb 15-20, 2010, Vienna, Austria). Submitted to the Proceedings

Published
2010
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13. A Study of the Superplastic Deformation Behavior of Low-Cost Ti-2Fe-0.1B Alloys.

Author

Mi, Yaoyao, Lu, Yu, Wang, Delong, Zhao, Yihui, Dong, Yuecheng, Chang, Hui, and Alexandrov, I. V.

Subjects
STRAIN rate, DEFORMATIONS (Mechanics), ALLOYS, TITANIUM alloys, CRYSTAL lattices, RECRYSTALLIZATION (Metallurgy)
Abstract

Titanium alloys have high specific strength and corrosion resistance, which have promising applications in industry. However, the machinability of titanium alloys is limited due to their crystal lattice and physical properties. Thus, in recent years, the superplastic forming of titanium alloys has been intensively developing, in particular, forming at low temperatures and/or high strain rates. In this work, a tensile test of low-cost Ti-2Fe-0.1B alloys was carried out at a temperature of 550~750 °C and a strain rate of 1 × 10−3 s−1~1 × 10−2 s−1. The results showed that the alloy exhibited good superplasticity even at a high strain rate (1 × 10−2 s−1) and a low deformation temperature of 550 °C; the elongation of the alloy in this state reached 137.5%. The high strain rate sensitivity coefficient m (0.3) and the maximum elongation (452%) were obtained at a strain rate of 1 × 10−3 s−1 and a temperature of 750 °C. Characteristics of the microstructure showed that during superplastic deformation, the recrystallization and grain boundary sliding of the alloy phases were accelerated, which could be ascribed to the effect of the element Fe. At the same time, the TiB phase located around the primary elongated α grains could also induce dynamic recrystallization and dynamic globularization during deformation. [ABSTRACT FROM AUTHOR]

Published
2024
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15. An on-line Integrated Bookkeeping: electronic run log book and Meta-Data Repository for ATLAS

Author

Barczyc, M., Burckhart-Chromek, D., Caprini, M., Conceicao, J. Da Silva, Dobson, M., Flammer, J., Jones, R., Kazarov, A., Kolos, S., Liko, D., Mapelli, L., Soloviev, I., NIKHEF, R. Hart, Amorim, A., Klose, D., Lima, J., Lucio, L., Pedro, L., Wolters, H., NIPNE, E. Badescu, Alexandrov, I., Kotov, V., JINR, M. Mineev, and PNPI, Yu. Ryabov

Subjects
Computer Science - Databases, H.2.4, H.2.8
Abstract

In the context of the ATLAS experiment there is growing evidence of the importance of different kinds of Meta-data including all the important details of the detector and data acquisition that are vital for the analysis of the acquired data. The Online BookKeeper (OBK) is a component of ATLAS online software that stores all information collected while running the experiment, including the Meta-data associated with the event acquisition, triggering and storage. The facilities for acquisition of control data within the on-line software framework, together with a full functional Web interface, make the OBK a powerful tool containing all information needed for event analysis, including an electronic log book. In this paper we explain how OBK plays a role as one of the main collectors and managers of Meta-data produced on-line, and we'll also focus on the Web facilities already available. The usage of the web interface as an electronic run logbook is also explained, together with the future extensions. We describe the technology used in OBK development and how we arrived at the present level explaining the previous experience with various DBMS technologies. The extensive performance evaluations that have been performed and the usage in the production environment of the ATLAS test beams are also analysed.

Published
2003

16. Verification and Diagnostics Framework in ATLAS Trigger/DAQ

Author

Alexandrov, I., Amorim, A., Badescu, E., Barczyk, M., Burckhart-Chromek, D., Caprini, M., Conceicao, J. Da Silva, Dobson, M., Flammer, J., Hart, R., Jones, R., Kazarov, A., Kolos, S., Kotov, V., Klose, D., Liko, D., Lima, J., Lucio, L., Mapelli, L., Mineev, M., Pedro, L., Ryabov, Yu., Soloviev, I., and Wolters, H.

Subjects
High Energy Physics - Experiment
Abstract

Trigger and data acquisition (TDAQ) systems for modern HEP experiments are composed of thousands of hardware and software components depending on each other in a very complex manner. Typically, such systems are operated by non-expert shift operators, which are not aware of system functionality details. It is therefore necessary to help the operator to control the system and to minimize system down-time by providing knowledge-based facilities for automatic testing and verification of system components and also for error diagnostics and recovery. For this purpose, a verification and diagnostic framework was developed in the scope of ATLAS TDAQ. The verification functionality of the framework allows developers to configure simple low-level tests for any component in a TDAQ configuration. The test can be configured as one or more processes running on different hosts. The framework organizes tests in sequences, using knowledge about components hierarchy and dependencies, and allowing the operator to verify the functionality of any subset of the system. The diagnostics functionality includes the possibility to analyze the test results and diagnose detected errors, e.g. by starting additional tests and understanding reasons of failures. A conclusion about system functionality, error diagnosis and recovery advice are presented to the operator in a GUI. The current implementation uses the CLIPS expert system shell for knowledge representation and reasoning., Comment: Paper for the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003 (presented as poster). Format: PDF, using MSWord template, 5 pages, 6 figures. PSN TUGP005

Published
2003

17. Online Monitoring software framework in the ATLAS experiment

Author

Kolos, S., Alexandrov, I., Amorim, A., Barczyk, M., Badescu, E., Burckhart-Chromek, D., Caprini, M., Conceicao, J. Da Silva, Dobson, M., Flammer, J., Hart, R., Jones, R., Kazarov, A., Klose, D., Kotov, V., Liko, D., Lima, J., Lucio, L., Mapelli, L., Mineev, M., Pedro, L., Ryabov, Yu., Soloviev, I., and Wolters, H.

Subjects
High Energy Physics - Experiment
Abstract

A fast, efficient and comprehensive monitoring system is a vital part of any HEP experiment. This paper describes the software framework that will be used during ATLAS data taking to monitor the state of the data acquisition and the quality of physics data in the experiment. The framework has been implemented by the Online Software group of the ATLAS Trigger&Data Acquisition (TDAQ) project and has already been used for several years in the ATLAS test beams at CERN. The inter-process communication in the framework is implemented via CORBA, which provides portability between different operating systems and programming languages. This paper will describe the design and the most important aspects of the online monitoring framework implementation. It will also show some test results, which indicate the performance and scalability of the current implementation., Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, PDF. PSN THGT003

Published
2003

21. ATLAS DataFlow: The Read-Out Subsystem, Results from Trigger and Data-Acquisition System Testbed Studies and from Modeling

Author

Vermeulen, J, Abolins, M, Alexandrov, I, Amorim, A, Dos Anjos, A, Badescu, E, Barros, N, Beck, HP, Blair, R, Burckhart-Chromek, D, Caprini, M, Ciobotaru, M, Corso-Radu, A, Cranfield, R, Crone, G, Dawson, J, Dobinson, R, Dobson, M, Drake, G, Ermoline, Y, Ferrari, R, Ferrer, ML, Francis, D, Gadomski, S, Gameiro, S, Gorini, B, Green, B, Gruwé, M, Haas, S, Haberichter, W, Haeberli, C, Hasegawa, Y, Hauser, R, Hinkelbein, C, Hughes-Jones, R, Joos, M, Kazarov, A, Kieft, G, Klose, D, Kolos, S, Korcyl, K, Kordas, K, Kotov, V, Kugel, A, Lankford, A, Miotto, G Lehmann, Levine, MJ, Mapelli, L, Martin, B, Mclaren, R, Meirosu, C, Mineev, M, Misiejuk, A, Mornacchi, G, Müller, M, Murillo, R, Nagasaka, Y, Petersen, J, Pope, B, Prigent, D, Ryabov, Y, Schlereth, J, Sloper, JE, Soloviev, I, Spiwoks, R, Stancu, S, Strong, J, Tremblet, L, Ünel, G, Vandelli, W, Werner, P, Wickens, F, Wiesmann, M, Wu, M, and Yasu, Y

Subjects
ATLAS, data acquisition, LHC, real-time systems, triggering, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Biomedical Engineering, Nuclear & Particles Physics
Abstract

In the ATLAS experiment at the LHC, the output of read-out hardware specific to each subdetector will be transmitted to buffers, located on custom made PCI cards ("ROBINs"). The data consist of fragments of events accepted by the first-level trigger at a maximum rate of 100 kHz. Groups of four ROBINs will be hosted in about 150 Read-Out Subsystem (ROS) PCs. Event data are forwarded on request via Gigabit Ethernet links and switches to the second-level trigger or to the Event builder. In this paper a discussion of the functionality and real-time properties of the ROS is combined with a presentation of measurement and modelling results for a testbed with a size of about 20% of the final DAQ system. Experimental results on strategies for optimizing the system performance, such as utilization of different network architectures and network transfer protocols, are presented for the testbed, together with extrapolations to the full system. © 2006 IEEE.

Published
2006

22. ATLAS DataFlow: The Read-Out Subsystem, Results from Trigger and Data-Acquisition System Testbed Studies and from Modeling

Author

Vermeulen, J, Abolins, M, Alexandrov, I, Amorim, A, Dos Anjos, A, Badescu, E, Barros, N, Beck, HP, Blair, R, Burckhart-Chromek, D, Caprini, M, Ciobotaru, M, Corso-Radu, A, Cranfield, R, Crone, G, Dawson, J, Dobinson, R, Dobson, M, Drake, G, Ermoline, Y, Fcrrari, R, Ferrer, ML, Francis, D, Gadomski, S, Gameiro, S, Gorini, B, Green, B, Gruwé, M, Haas, S, Haberichter, W, Haeberli, C, Hasegawa, Y, Hauser, R, Hinkelbein, C, Hughes-Jones, R, Joos, M, Kazarov, A, Kieft, G, Klose, D, Kolos, S, Korcyl, K, Kordas, K, Kotov, V, Kuge, A, Lankford, A, Lehmann, G, LeVine, MJ, Mapelli, L, Martin, B, McLaren, R, Meirosu, C, Mineev, M, Misiejuk, A, Mornacchi, G, Müller, M, Murillo, R, Nagasaka, Y, Petersen, J, Pone, B, Prigent, D, Ryabov, Y, Schlereth, J, Sloper, JE, Soloviev, I, Spiwoks, R, Stancu, S, Strong, J, Tremblet, L, Ünel, G, Vandelli, W, Werner, P, Wiekens, F, Wiesmann, M, Wu, M, and Yasu, Y

Abstract

In the ATLAS experiment at the LHC, the output of readout hardware specific to each subdetector will be transmitted to buffers, located on custom made PCI cards ("ROBINs"). The data consist of fragments of events accepted by the first-level trigger at a maximum rate of 100 kHz. Groups of four ROBINs will be hosted in about 150 Read-Out Subsystem (ROS) PCs. Event data are forwarded on request via Gigabit Ethernet links and switches to the second-level trigger or to the Event builder. In this paper a discussion of the functionality and real-time properties of the ROS is combined with a presentation of measurement and modelling results for a testbed with a size of about 20% of the final DAQ system. Experimental results on strategies for optimizing the system performance, such as utilization of different network architectures and network transfer protocols, are presented for the testbed, together with extrapolations to the full system. ©2005 IEEE.

Published
2005

26. Low-Cycle Fatigue Behavior and Fracture Characteristics of Low-Cost Ti-2Fe-0.1B Alloy.

Author

Wang, Chu, Sun, Yangyang, Mi, Yaoyao, Dong, Yuecheng, Chang, Hui, and Alexandrov, I. V.

Subjects
STRAINS & stresses (Mechanics), STRESS fractures (Orthopedics), FATIGUE life, ALLOYS, MICROALLOYING, TITANIUM alloys, ALLOY fatigue
Abstract

In recent decades, the effect of Fe element addition on titanium alloy has been investigated extensively due to the development of low-cost titanium alloys, as well as B microalloying, which could decrease the grain size of titanium alloys during the casting process. As a key structural material, the study of the fatigue behavior of titanium alloys is crucial and always attractive for scientists. Hence, in this paper, the low cycle fatigue (LCF) behavior and fracture characteristics of a low-cost Ti-2Fe-0.1B alloy with a lamellar structure were investigated systematically, five different strain amplitudes (Δεt/2) in the range from 0.6% to 1.4% were selected to control the LCF process. It was found that the Ti-2Fe-0.1B alloy exhibits continuous cyclic softening behavior in the cycle as a whole at Δεt/2 ≤ 1.2%, while at Δεt/2 = 1.4%, it exhibits slight cyclic hardening at the initial stage of the cycle, then shows cyclic softening. Compared with pure titanium and other typical titanium alloys, the Ti-2Fe-0.1B alloy indicated maximum fatigue life under the same strain amplitude, it can be attributed to the fine grain size result from the effect of Fe element and trace B, which could hinder the dislocation movement and crack propagation. [ABSTRACT FROM AUTHOR]

Published
2023
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32. Influence of SFE on Mechanical Properties of Brass, Subjected to SPD

Author

Zaynullina, L. I., Alexandrov, I. V., and Александров, И. В.

Subjects
ECAP, ДВОЙНИКИ ДЕФОРМАЦИИ, STRENGTH, ЭНЕРГИЯ ДЕФЕКТА УПАКОВКИ, DEFORMATION TWINS, ПРОЧНОСТЬ, STACKING FAULT ENERGY, РКУП
Abstract

In this paper presents the results of investigation the strength properties of the model single-phase Cu–30 wt. % Zn alloy, which has a low stacking fault energy (SFE) of 14 mJ⋅m–2. After ECAP and subsequent rolling nanoscale twins were formed in the microstructure. Rolling the alloy leads to strength increasing due to decrease structural elements size. В настоящей работе представлены результаты исследования прочностных свойств модельного однофазного сплава Cu–30 масс. % Zn, обладающего низким значением энергии дефекта упаковки (ЭДУ) 14 мДж⋅м–2. После проведения равноканального углового прессования (РКУП) с последующей прокаткой в микроструктуре были сформированы наноразмерные двойники. Прокатка сплава приводит к увеличению прочности за счет измельчения размера структурных элементов. Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 19–33–90109.

Published
2020

48. Microstructure and Mechanical Properties of Joint Welds Formed by Linear Friction Welding in Al-Cu-Mg Alloy

Author

Kiselyeva, S. K., Vasily Astanin, Gareeva, L., Bychkov, V. M., Medvedev, A. Y., Musin, F. F., and Alexandrov, I. V.

Subjects
linear friction welding, lcsh:TA1-2040, microstructure, lcsh:Technology (General), lcsh:T1-995, aluminum alloy, lcsh:Engineering (General). Civil engineering (General)
Abstract

The microstructure and mechanical properties of joint welds formed by linear friction welding (LFW) in in Al-Cu-Mg alloy was investigated. Joint welds of two samples of rectangular shape do not possess any macroscopic defects and are characterized by high strength. The substantial transformation of the microstructure occurs in the weld zone as a result of plastic deformation and deformation heating during LFW

Published
2014

49. Effect of temperature on the evolution of structure, crystallographic texture and the anisotropy of strength properties in the Ti grade 4 alloy during continuous ECAP

Author

Sitdikov V., Alexandrov I., Ganiev M., Fakhretdinova E., and Raab G.

Abstract

© 2015 Advanced Centr Co. Ltd. This paper presents the results of experimental studies on the evolution of structure, crystallographic texture and the anisotropy of strength properties in the volume of Ti Grade 4 billets subjected to continuous equal-channel angular pressing (ECAP). Continuous ECAP is performed at temperatures of 200° 400° and 450° with 1 to 8 passes, using route BC. The methods of X-ray diffraction analysis are employed to investigate the effect of processing regimes and strain degree during continuous ECAP on the structure of the material under study. As a result of computer modelling of the crystallograpic texture evolution, the regularities in the formation of preferred orientations and the anisotropy of strength properties are established, and the activity of various slip systems and twinning systems in titanium billets, depending on the number of ECAP passes, is evaluted. Estimation of the anisotropy of strength properties, based on building of yield contours, shows that an increase in the number of passes of continuous ECAP promotes the formation of a more isotropic structure. The obtained results allow to explain and predict the deformation behavior of nanostructured Ti Grade 4 with consideration of its microstructure and crystallographic texture parameters.

Published
2015

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