The Geant4 Virtual Monte Carlo Hrivnacova, I
Journal of physics. Conference series,
01/2012, Letnik:
396, Številka:
2
Journal Article
Recenzirano
Odprti dostop
The Virtual Monte Carlo (VMC) 1 provides the abstract interface to the Monte Carlo transport codes: GEANT 3.21 2, Geant4 3, and FLUKA 4. The user VMC based application, independent from the specific ...Monte Carlo codes, can be then run with all supported simulation programs. VMC has been developed by the ALICE Offline Project and it has drawn attention in other experimental frameworks. Since its first release in 2002, the implementation of the VMC for Geant4 (Geant4 VMC) has been continuously maintained and developed, driven by the evolution of Geant4 on one side and the requirements from users on the other side. In this paper we report on new features in this tool, we present its development multi-threading version based on the Geant4 MT prototype 5 as well as the time comparisons of equivalent native Geant4 and VMC test applications.
The current status of the Geant4 toolkit and the recent developments for the geometry, electromagnetic and hadronic physics for medium and high energy are presented. The focus of many recent ...improvements of the toolkit are key applications including the simulation of large Hadron collider (LHC) experiments at CERN. These developments and physics model extensions provide new capabilities and improvements for other applications of the toolkit for radiation studies in high energy physics (HEP), space and medical research.
We review the context, the motivations and the expected performances of a comprehensive and ambitious fixed-target programme using the multi-TeV proton and ion LHC beams. We also provide a detailed ...account of the different possible technical implementations ranging from an internal wire target to a full dedicated beam line extracted with a bent crystal. The possibilities offered by the use of the ALICE and LHCb detectors in the fixed-target mode are also reviewed.
The ALICE Geant4 Simulation Hřivnáčová, I; Datskova, O; Gheata, A ...
Journal of physics. Conference series,
01/2011, Letnik:
331, Številka:
3
Journal Article
Recenzirano
Odprti dostop
ALICE adopted a strategy to develop a virtual interface to the detector simulation codes, the Virtual Monte Carlo 1, with which the transport of particles can be performed with three different ...detector simulation codes: GEANT 3.21 2, Geant4 3, and FLUKA 4. The Root geometrical modeller, TGeo 5, was adopted by ALICE as the unique geometry description in the simulation and reconstruction framework. This implied the integration of the TGeo geometrical modeller with all the transport codes used. GEANT3 was the most frequently used detector transport codes in past years, however, the recent LHC data production has created a greater interest in other transport codes. In this paper we will present our experience with Geant4. We will give an overview and the present status of the tools used in the Geant4 simulation: the implementation of the Virtual Monte Carlo interface, Geant4 VMC 6, and the implementation of Geant4 geometry navigation using directly the TGeo geometry, G4Root 7. We will also present the deployment of these tools on the Grid, the results obtained, as well as their comparison with GEANT3 and with real data.
Thanks to its multi-TeV LHC proton and lead beams, the LHC complex allows one to perform the most energetic fixed-target experiments ever and to study with high precision pp, pd and pA collisions at ...sNN=115GeV and Pbp and PbA collisions at sNN=72GeV. We present a selection of feasibility studies for the production of quarkonia, open heavy-flavor mesons as well as light-flavor hadrons in pA and PbA collisions using the LHCb and ALICE detectors in a fixed-target mode.
Analysis Tools in Geant4 10.2 and 10.3 Hřivnáčová, I; Barrand, G
Journal of physics. Conference series,
10/2017, Letnik:
898, Številka:
4
Journal Article
Recenzirano
Odprti dostop
A new analysis category based on g4tools was added in Geant4 release 9.5 (2011). The aim was to provide users with a lightweight analysis tool available as part of the Geant4 installation without the ...need to link to an external analysis package. It has progressively been included in all Geant4 examples. Frequent questions in the Geant4 users forum show its increasing popularity in the Geant4 users community. In this presentation, we will give a brief overview of g4tools and the analysis category. We report on new developments since our CHEP 2013 contribution as well as mention upcoming new features.
Geant4 VMC 3.0 H ivná ová, I; Gheata, A
Journal of physics. Conference series,
01/2015, Letnik:
664, Številka:
7
Journal Article
Recenzirano
Odprti dostop
Virtual Monte Carlo (VMC) 1 provides an abstract interface into Monte Carlo transport codes. A user VMC based application, independent from the specific Monte Carlo codes, can be then run with any of ...the supported simulation programs. Developed by the ALICE Offline Project and further included in ROOT 2, the interface and implementations have reached stability during the last decade and have become a foundation for other detector simulation frameworks, the FAIR facility experiments framework being among the first and largest. Geant4 VMC 3, which provides the implementation of the VMC interface for Geant4 4, is in continuous maintenance and development, driven by the evolution of Geant4 on one side and requirements from users on the other side. Besides the implementation of the VMC interface, Geant4 VMC also provides a set of examples that demonstrate the use of VMC to new users and also serve for testing purposes. Since major release 2.0, it includes the G4Root navigator package, which implements an interface that allows one to run a Geant4 simulation using a ROOT geometry. The release of Geant4 version 10.00 with the integration of multithreading processing has triggered the development of the next major version of Geant4 VMC (version 3.0), which was released in November 2014. A beta version, available for user testing since March, has helped its consolidation and improvement. We will review the new capabilities introduced in this major version, in particular the integration of multithreading into the VMC design, its impact on the Geant4 VMC and G4Root packages, and the introduction of a new package, MTRoot, providing utility functions for ROOT parallel output in independent files with necessary additions for thread-safety. Migration of user applications to multithreading that preserves the ease of use of VMC will be also discussed. We will also report on the introduction of a new CMake 5 based build system, the migration to ROOT major release 6 and the improvement of the testing suites.
We report on the studies of Transverse-Momentum-Dependent distributions (TMDs) at a future fixed-target experiment –AFTER@LHC– using the
p
+
or Pb ion LHC beams, which would be the most energetic ...fixed-target experiment ever performed. AFTER@LHC opens new domains of particle and nuclear physics by complementing collider-mode experiments, in particular those of RHIC and the EIC projects. Both with an extracted beam by a bent crystal or with an internal gas target, the luminosity achieved by AFTER@LHC surpasses that of RHIC by up to 3 orders of magnitude. With an unpolarised target, it allows for measurements of TMDs such as the Boer-Mulders quark distributions and the distribution of unpolarised and linearly polarised gluons in unpolarised protons. Using polarised targets, one can access the quark and gluon Sivers TMDs through single transverse-spin asymmetries in Drell-Yan and quarkonium production. In terms of kinematics, the fixed-target mode combined with a detector covering
η
lab
∈
1
,
5
allows one to measure these asymmetries at large
x
↑
in the polarised nucleon.
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