@article{MTMT:34822373, title = {Characterisation of plastic scintillator paddles and lightweight MWPCs for the MID subsystem of ALICE 3}, url = {https://m2.mtmt.hu/api/publication/34822373}, author = {Alfaro, R. and Hernández, M.A. and Bencédi, Gyula and Cabanillas Noris, J.C. and Díaz, Maldonado M.A. and Duarte, Galvan C. and Téllez, A.F. and Barnaföldi, Gergely Gábor and Gera, Ádám László and Grabsky, V. and Hamar, Gergő and Herrera, Corral G. and León, Monzón I. and Martínez, García J. and Martínez, Hernandez M.I. and Muñoz, Méndez J.E. and Nagy, R. and Narcio, Laveaga R.I. and Ortiz, A. and Rodríguez-Cahuantzi, M. and Rojas, Torres S. and Szollosova, T. and Patiño, Salazar M.E. and Pazarán, García J. and Regules, Medel H.D. and Tejeda, Muñoz G. and Vargas, Torres P. and Varga, Dezső and Vértesi, Róbert and Vasquez, Beltran Y.A. and Vázquez, Villamar C.R. and Yoval, Pozos I.}, doi = {10.1088/1748-0221/19/04/T04006}, journal-iso = {J INSTRUM}, journal = {JOURNAL OF INSTRUMENTATION}, volume = {19}, unique-id = {34822373}, issn = {1748-0221}, year = {2024}, eissn = {1748-0221}, orcid-numbers = {Varga, Dezső/0000-0002-2450-1331} } @article{MTMT:34317845, title = {3D Muographic Inversion in the Exploration of Cavities and Low-density Fractured Zones}, url = {https://m2.mtmt.hu/api/publication/34317845}, author = {Balázs, László and Nyitrai, Gábor and Surányi, Gergely and Hamar, Gergő and Barnaföldi, Gergely Gábor and Varga, Dezső}, doi = {10.1093/gji/ggad428}, journal-iso = {GEOPHYS J INT}, journal = {GEOPHYSICAL JOURNAL INTERNATIONAL}, volume = {236}, unique-id = {34317845}, issn = {0956-540X}, abstract = {Muography is an imaging tool based on the attenuation of cosmic muons for observing density anomalies associated with large objects, such as underground caves or fractured zones. Tomography based on muography measurements, that is, three dimensional reconstruction of density distribution from two dimensional muon flux maps, brings along special challenges. The detector field of view covering must be as balanced as possible, considering the muon flux drop at high zenith angles and the detector placement possibilities. The inversion from directional muon fluxes to a 3D density map is usually underdetermined (more voxels than measurements). Therefore, the solution of the inversion can be unstable due to partial coverage. The instability can be solved by geologically relevant Bayesian constraints. However, the Bayesian principle results in parameter bias and artifacts. In this work, linearized (density-length based) inversion is applied by formulating the constraints associated with inversion to ensure the stability of parameter fitting. After testing the procedure on synthetic examples, an actual high-quality muography measurement data set from 7 positions is used as input for the inversion. The resulting tomographic imaging provides details on the complicated internal structures of karstic fracture zone. The existence of low density zones in the imaged space was verified by samples from core drills, which consist of altered dolomite powder within the intact high density dolomite.}, year = {2024}, eissn = {1365-246X}, pages = {700-710}, orcid-numbers = {Balázs, László/0000-0003-1544-5734; Varga, Dezső/0000-0002-2450-1331} } @article{MTMT:34329427, title = {The high voltage system of the novel MPGD-based photon detectors of COMPASS RICH-1 and its development towards a scalable High Voltage Power Supply System for MPGDs}, url = {https://m2.mtmt.hu/api/publication/34329427}, author = {Bressan, A. and Carrato, S. and Chatterjee, C. and Cicuttin, A. and Crespo, M. L. and D'Ago, D. and Dalla Torre, S. and Dasgupta, S. and Ballina, E. M. G. and Florian, S. W. and Ordonez, L. Garcia and Gregori, M. and Hamar, Gergő and Kosoveu, A. and Levorato, S. and Mannatunga, K. and Martin, A. and Tessarotto, F. and Valinoti, B.}, doi = {10.1016/j.nima.2023.168558}, journal-iso = {NUCL INSTRUM METH A}, journal = {NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT}, volume = {1056}, unique-id = {34329427}, issn = {0168-9002}, keywords = {FPGA; RICH; high voltage; MM; THGEM}, year = {2023}, eissn = {1872-9576} } @article{MTMT:33571467, title = {Muon Imaging of Volcanic Conduit Explains Link Between Eruption Frequency and Ground Deformation}, url = {https://m2.mtmt.hu/api/publication/33571467}, author = {Oláh, László and Gallo, G and Hamar, Gergő and Kamoshida, O and Leone, G and Llewellin, EW and Lo Presti, D and Nyitrai, Gábor and Ohminato, T and Ohno, S and Tanaka, HKM and Varga, Dezső}, doi = {10.1029/2022GL101170}, journal-iso = {GEOPHYS RES LETT}, journal = {GEOPHYSICAL RESEARCH LETTERS}, volume = {50}, unique-id = {33571467}, issn = {0094-8276}, abstract = {Understanding the physical mechanism of ground deformation at a volcano supports the use of deformation data as a monitoring tool. An inverse correlation was observed between eruption frequency and ground deformation of Sakurajima volcano from November 2018 to April 2021. Over the same period, the mass density of magma in the conduit was monitored via muography. Mass density increased during inflation, when eruption frequency was low, and decreased during deflation, when eruption frequency was high. Periods of low eruption frequency are associated with the formation of a dense plug in the conduit, which we infer caused the inflation of the edifice by trapping pressurized magmatic gas. Conversely, periods of high eruption frequency are associated with the absence of the plug, which we infer allows gas to escape, leading to deflation. Muography thus reveals the in-conduit physical mechanism for the observed correlation, with implications for interpretation of deformation at other volcanoes.}, keywords = {radiography; FLUX; seismicity; dome}, year = {2023}, eissn = {1944-8007}, orcid-numbers = {Oláh, László/0000-0002-4300-8331; Varga, Dezső/0000-0002-2450-1331} } @article{MTMT:34127755, title = {Földtudományi kutatások és geotechnikai alkalmazások kozmikus müonok mérésével}, url = {https://m2.mtmt.hu/api/publication/34127755}, author = {Oláh, László and Balázs, László and Barnaföldi, Gergely Gábor and Galgóczi, Gábor and Gera, Ádám László and Hamar, Gergő and Nyitrai, Gábor and Surányi, Gergely and Tanaka, Hiroyuki K. M. and Varga, Dezső}, journal-iso = {MAGYAR GEOFIZIKA}, journal = {MAGYAR GEOFIZIKA}, volume = {62}, unique-id = {34127755}, issn = {0025-0120}, year = {2022}, eissn = {2677-1497}, pages = {225-241}, orcid-numbers = {Balázs, László/0000-0003-1544-5734; Varga, Dezső/0000-0002-2450-1331} } @inproceedings{MTMT:34127743, title = {Multi-Wire Detectors for Underground Muography}, url = {https://m2.mtmt.hu/api/publication/34127743}, author = {Hamar, Gergő and Surányi, Gergely and Varga, Dezső and Balogh, Szabolcs József and Nyitrai, Gábor and Molnár, Gábor and Gera, Ádám László and Galgóczi, Gábor and Barnaföldi, Gergely Gábor}, booktitle = {Proceedings of the 18th International Congress of Speleology}, unique-id = {34127743}, year = {2022}, pages = {123-126} } @inproceedings{MTMT:34127672, title = {Cavity Location by Muon Tomography}, url = {https://m2.mtmt.hu/api/publication/34127672}, author = {Hamar, Gergő and Surányi, Gergely and Varga, Dezső and Balogh, Szabolcs József and Nyitrai, Gábor and Molnár, Gábor and Gera, Ádám László and Galgóczi, Gábor and Barnaföldi, Gergely Gábor}, booktitle = {Proceedings of the 18th International Congress of Speleology}, unique-id = {34127672}, year = {2022}, pages = {119-122} } @{MTMT:33572081, title = {Exploration of Underground Cave Systems with Muography}, url = {https://m2.mtmt.hu/api/publication/33572081}, author = {Hamar, Gergő and Surányi, Gergely and Oláh, László and Varga, Dezső}, booktitle = {Muography:Exploring Earth's Subsurface with Elementary Particles}, doi = {10.1002/9781119722748.ch11}, unique-id = {33572081}, year = {2022}, pages = {153-163}, orcid-numbers = {Oláh, László/0000-0002-4300-8331; Varga, Dezső/0000-0002-2450-1331} } @article{MTMT:33571453, title = {Muography of the Active Sakurajima Volcano: Recent Results and Future Perspectives of Hazard Assessment}, url = {https://m2.mtmt.hu/api/publication/33571453}, author = {Oláh, László and Tanaka, HKM and Ohminato, T and Nyitrai, Gábor and Hamar, Gergő and Varga, Dezső}, doi = {10.31526/JAIS.2022.285}, journal-iso = {J ADV INSTR SCI}, journal = {JOURNAL OF ADVANCED INSTRUMENTATION IN SCIENCE}, volume = {2022}, unique-id = {33571453}, year = {2022}, eissn = {2753-3352}, orcid-numbers = {Oláh, László/0000-0002-4300-8331; Varga, Dezső/0000-0002-2450-1331} } @article{MTMT:33571116, title = {Construction and Readout Systems for Gaseous Muography Detectors}, url = {https://m2.mtmt.hu/api/publication/33571116}, author = {Varga, Dezső and Hamar, Gergő and Balogh, Szabolcs József and Gera, Ádám László and Nyitrai, Gábor and Surányi, Gergely}, doi = {10.31526/jais.2022.307}, journal-iso = {J ADV INSTR SCI}, journal = {JOURNAL OF ADVANCED INSTRUMENTATION IN SCIENCE}, volume = {2022}, unique-id = {33571116}, year = {2022}, eissn = {2753-3352}, orcid-numbers = {Varga, Dezső/0000-0002-2450-1331} }