The CMS object-oriented simulation

IEEE Nuclear Science Symposium Conference Record, 2005 Pub Date : 2005-10-01 DOI:10.1109/NSSMIC.2005.1596421

S. Abdoulline, N. Amapane, F. Ambroglini, P. Arce, S. Ashby, S. Banerjee, U. Berthon, T. Boccali, M. Case, C. Charlot, H. Cheung, T. Cox, N. Darmenov, A. De Roeck, X. Ding, S. Dutta, D. Elvira, F. Ferro, A. Giammanco, P. Govoni, O. Gutsche, X. Huang, V. Innocente, C. Jones, A. Kharchilava, P. Katsas, J. Kowalkowski, K. Lassila-Perini, S. Magni, P. Meridiani, F. Moortgat, A. Nikitenko, I. Osborne, M. Paterno, M. Pioppi, S. Piperov, N. Ratnokiva, A. Rizzi, E. Sexton-Kennedy, E. Shabalina, L. Silvestris, M. Spiropulu, M. Stavrianakou, W. Tanenbaum, J. Weng, T. Wildish, R. Wilkinson, S. Wynhoff, A. Yagil, J. Yarba, M. Zanetti, A. Zhokin

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引用次数: 1

Abstract

The CMS object oriented Geant4-based program is used to simulate the complete central CMS detector (over 1 million geometrical volumes) and the forward systems such as the Totem telescopes, Castor calorimeter, zero degree calorimeter, Roman pots, and the luminosity monitor. The simulation utilizes the full set of electromagnetic and hadronic physics processes provided by Geant4 and detailed particle tracking in the 4 tesla magnetic field. Electromagnetic shower parameterization can be used instead of full tracking of high-energy electrons and positrons, allowing significant gains in speed without detrimental precision losses. The simulation physics has been validated by comparisons with test beam data and previous simulation results. The system has been in production for almost two years and has delivered over 100 million events for various LHC physics channels. Productions are run on the US and EU grids at a rate of 3-5 million events per month. At the same time, the simulation has evolved to fulfill emerging requirements for new physics simulations, including very large heavy ion events and a variety of SUSY scenarios. The software has also undergone major technical upgrades. The framework and core services have been ported to the new CMS offline software architecture and event data model. In parallel, the program is subjected to ever more stringent quality assurance procedures, including a recently commissioned automated physics validation suite

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CMS面向对象仿真

利用面向对象的基于geant4的CMS程序，模拟了CMS中央探测器(超过100万几何体积)和Totem望远镜、Castor量热计、零度量热计、Roman盆、光度监测器等前向系统。仿真利用了Geant4提供的全套电磁和强子物理过程，并在4特斯拉磁场中进行了详细的粒子跟踪。电磁阵雨参数化可以用来代替对高能电子和正电子的全面跟踪，从而在不损害精度的情况下显著提高速度。通过与试验光束数据和以往模拟结果的对比，验证了模拟物理特性。该系统已投入生产近两年，并已为各种大型强子对撞机物理频道提供了超过1亿个事件。在美国和欧盟的电网上以每月300万至500万次的速度运行。同时，模拟已经发展到满足新物理模拟的新需求，包括非常大的重离子事件和各种超对称性场景。该软件也经历了重大的技术升级。框架和核心服务已经移植到新的CMS离线软件架构和事件数据模型上。与此同时，该项目还受到更严格的质量保证程序的约束，包括最近委托的自动化物理验证套件

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IEEE Nuclear Science Symposium Conference Record, 2005

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