Vladimir N. Ivanchenko

Geant4 developments and applications

Geant4 is a software toolkit for the simulation of the passage of particles through matter. It is used by a large number of experiments and projects in a variety of application domains, including high energy physics, astrophysics and space science, medical physics and radiation protection. Its functionality and modeling capabilities continue to be extended, while its performance is enhanced. An overview of recent developments in diverse areas of the toolkit is presented. These include performance optimization for complex setups; improvements for the propagation in fields; new options for event biasing; and additions and improvements in geometry, physics processes and interactive capabilities

Comparison of Geant4 electromagnetic physics models against the NIST reference data

The Geant4 Simulation Toolkit provides an ample set of physics models describing electromagnetic interactions of particles with matter. This paper presents the results of a series of comparisons for the evaluation of Geant4 electromagnetic processes with respect to United States National Institute of Standards and Technologies (NIST) reference data. A statistical analysis was performed to estimate quantitatively the compatibility of Geant4 electromagnetic models with NIST data; the statistical analysis also highlighted the respective strengths of the different Geant4 models.

GRAS: a general-purpose 3-D Modular Simulation tool for space environment effects analysis

Geant4 Radiation Analysis for Space (GRAS) is a modular, extendable tool for space environment effects simulation. Analyses include cumulative ionizing and NIEL doses, effects to humans, charging, fluence and transient effects in three-dimensional geometry models.

Geant4 models for simulation of multiple scattering

Recent progress in development of single and multiple scattering models within the Geant4 toolkit is presented. Different options available to users are discussed. The comparisons with the data are shown. The trade of precision versus CPU performance is discussed with the focus on LHC detectors simulation.

Geant4 toolkit for simulation of HEP experiments

The status of Geant4 toolkit for Monte Carlo simulation of particle transport and interaction with matter is presented.

Geant4 hadronic physics for space radiation environment.

Abstract Purpose: To test and to develop Geant4 (Geometry And Tracking version 4) Monte Carlo hadronic models with focus on applications in a space radiation environment. Materials and methods: The Monte Carlo simulations have been performed using the Geant4 toolkit. Binary (BIC), its extension for incident light ions (BIC-ion) and Bertini (BERT) cascades were used as main Monte Carlo generators. For comparisons purposes, some other models were tested too. The hadronic testing suite has been used as a primary tool for model development and validation against experimental data. Results: The Geant4 pre-compound (PRECO) and de-excitation (DEE) models were revised and improved. Proton, neutron, pion, and ion nuclear interactions were simulated with the recent version of Geant4 9.4 and were compared with experimental data from thin and thick target experiments. Conclusions: The Geant4 toolkit offers a large set of models allowing effective simulation of interactions of particles with matter. We have tested different Monte Carlo generators with our hadronic testing suite and accordingly we can propose an optimal configuration of Geant4 models for the simulation of the space radiation environment.

Geant4 simulation of production and interaction of muons

A set of models for Monte Carlo simulation of production and interaction of high energy muons is developed in the framework of the Geant4 toolkit. It describes the following physics processes: ionization of high energy muons with radiative corrections, bremsstrahlung, electron-positron pair production, muon induced nuclear reactions, gamma annihilation into muon pair, positron annihilation into muon pair, and into pion pair. These processes are essential for the LHC experiments, for the understanding of the background in underground detectors, for the simulation of effects related with high-energy muons in cosmic ray experiments and for the estimation of backgrounds in future colliders. The applicability area of the models extends to 1 PeV. The major use-cases are discussed.

Geant4 and Fano cavity test: where are we?

The electron transport algorithm implemented in Geant4 has been recently revised. The modifications concern several physics aspects of the simulation model: the step limitation, the energy loss along a step and the multiple scattering. The Fano cavity setup was used to test these developments. The upgrades increase significantly the accuracy of the electron transport simulation. The ratio of simulated to theoretical dose deposition in the cavity is stable to ~1% while varying several parameters and within ~1.5% of the expected value for water and graphite. Work is underway to identify and resolve the remaining shift.

Measurement of the production cross-sections of pi(+/-) in p-C and pi(+/-)-C interactions at 12 GeV/c

The results of the measurements of the double-differential production cross-sections of pions, dσ/dpdΩ, in p-C and π-C interactions using the forward spectrometer of the HARP experiment are presented. The incident particles are 12 GeV/c protons and charged pions directed onto a carbon target with a thickness of 5% of a nuclear interaction length. For p-C interactions the analysis is performed using 100 035 reconstructed secondary tracks, while the corresponding numbers of tracks for π-C and π-C analyses are 106 534 and 10 122 respectively. Cross-section results are presented in the kinematic range 0.5 GeV/c ≤ pπ < 8 GeV/c and 30 mrad ≤ θπ < 240 mrad in the laboratory frame. The measured cross-sections have a direct impact on the precise calculation of atmospheric neutrino fluxes and on the improved reliability of extensive air shower simulations by reducing the uncertainties of hadronic interaction models in the low energy range. HARP collaboration M.G. Catanesi, E. Radicioni Università degli Studi e Sezione INFN, Bari, Italy R. Edgecock, M. Ellis, S. Robbins, F.J.P. Soler Rutherford Appleton Laboratory, Chilton, Didcot, UK C. Gößling Institut für Physik, Universität Dortmund, Germany S. Bunyatov, A. Krasnoperov, B. Popov, V. Tereshchenko Joint Institute for Nuclear Research, JINR Dubna, Russia E. Di Capua, G. Vidal–Sitjes Università degli Studi e Sezione INFN, Ferrara, Italy A. Artamonov, S. Giani, S. Gilardoni, P. Gorbunov, A. Grant, A. Grossheim, P. Gruber, V. Ivanchenko, A. Kayis-Topaksu, J. Panman, I. Papadopoulos, E. Tcherniaev, I. Tsukerman, R. Veenhof, C. Wiebusch, P. Zucchelli CERN, Geneva, Switzerland A. Blondel, S. Borghi, M. Campanelli, M.C. Morone, G. Prior, R. Schroeter Section de Physique, Université de Genève, Switzerland R. Engel, C. Meurer Forschungszentrum Karlsruhe, Institut für Kernphysik, Karlsruhe, Germany I. Kato University of Kyoto, Japan U. Gastaldi Laboratori Nazionali di Legnaro dell’ INFN, Legnaro, Italy G. B. Mills Los Alamos National Laboratory, Los Alamos, USA J.S. Graulich, G. Grégoire Institut de Physique Nucléaire, UCL, Louvain-la-Neuve, Belgium M. Bonesini, F. Ferri Università degli Studi e Sezione INFN, Milano, Italy M. Kirsanov Institute for Nuclear Research, Moscow, Russia A. Bagulya, V. Grichine, N. Polukhina P. N. Lebedev Institute of Physics (FIAN), Russian Academy of Sciences, Moscow, Russia V. Palladino Università “Federico II” e Sezione INFN, Napoli, Italy L. Coney, D. Schmitz Columbia University, New York, USA G. Barr, A. De Santo, C. Pattison, K. Zuber Nuclear and Astrophysics Laboratory, University of Oxford, UK F. Bobisut, D. Gibin, A. Guglielmi, M. Mezzetto Università degli Studi e Sezione INFN, Padova, Italy J. Dumarchez, F. Vannucci LPNHE, Universités de Paris VI et VII, Paris, France U. Dore Università “La Sapienza” e Sezione INFN Roma I, Roma, Italy D. Orestano, F. Pastore, A. Tonazzo, L. Tortora Università degli Studi e Sezione INFN Roma III, Roma, Italy C. Booth, L. Howlett Dept. of Physics, University of Sheffield, UK M. Bogomilov, M. Chizhov, D. Kolev, R. Tsenov Faculty of Physics, St. Kliment Ohridski University, Sofia, Bulgaria S. Piperov, P. Temnikov Institute for Nuclear Research and Nuclear Energy, Academy of Sciences, Sofia, Bulgaria M. Apollonio, P. Chimenti, G. Giannini, G. Santin Università degli Studi e Sezione INFN, Trieste, Italy J. Burguet–Castell, A. Cervera–Villanueva, J.J. Gómez–Cadenas, J. Mart́ın–Albo, P. Novella, M. Sorel Instituto de F́ısica Corpuscular, IFIC, CSIC and Universidad de Valencia, Spain Now at FNAL, Batavia, Illinois, USA. Jointly appointed by Nuclear and Astrophysics Laboratory, University of Oxford, UK. Now at Codian Ltd., Langley, Slough, UK. Now at University of Glasgow, UK. Also supported by LPNHE, Universités de Paris VI et VII, Paris, France. Now at Imperial College, University of London, UK. ITEP, Moscow, Russian Federation. Permanently at Instituto de F́ısica de Cantabria, Univ. de Cantabria, Santander, Spain. Now at SpinX Technologies, Geneva, Switzerland. Now at TRIUMF, Vancouver, Canada. Now at University of St. Gallen, Switzerland. On leave of absence from Ecoanalitica, Moscow State University, Moscow, Russia. Now at Çukurova University, Adana, Turkey. Now at III Phys. Inst. B, RWTH Aachen, Aachen, Germany. On leave of absence from INFN, Sezione di Ferrara, Italy. Now at CERN, Geneva, Switzerland. Now at Univerity of Rome Tor Vergata, Italy. Now at Lawrence Berkeley National Laboratory, Berkeley, California, USA. K2K Collaboration. MiniBooNE Collaboration. Now at Section de Physique, Université de Genève, Switzerland, Switzerland. Now at Royal Holloway, University of London, UK. Now at University of Sussex, Brighton, UK. Now at ESA/ESTEC, Noordwijk, The Netherlands.

Precision validation of Geant4 electromagnetic physics

The Geant4 toolkit provides an ample set of physics models for electromagnetic interactions. Results from a series of detailed tests with respect to well established reference data sources and experiments are presented, focusing on the precision validation of cross sections and angular distributions of various alternative physics models available in Geant4. Such precision tests are especially relevant for critical applications of simulation models, such as tracking detectors, calorimetry, neutrino and other astroparticle experiments, medical physics.