Fast Simulation for ATLAS: Atlfast-II and ISF
Fast Simulation for ATLAS: Atlfast-II and ISF
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ATLAS 快速仿真：Atlfast-II 和 ISF
DOI：
10.1088/1742-6596/396/2/022031
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
W. Lukas
中科院分区：
文献类型：
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作者：
W. Lukas
物理事件的蒙特卡罗模拟，包括探测器响应的详细模拟，对于高能物理实验的每次分析都是必不可少的。由于这些模拟数据集必须既大又精确，因此它们的生成是一项CPU密集型任务。大型强子对撞机（LHC）记录的亮度增加，因此要分析的数据量，导致系统和背景研究的模拟MC统计的需求稳步上升。这些巨大的MC要求更精细的物理分析只能通过实施快速模拟策略，使更快地生产大MC样品，以满足。ATLAS已经开发了完整和快速的探测器模拟技术，以在合作的计算限制内实现这一目标。我们提出了一种新的模拟方法，它在量热计中使用FastCaloSim软件包，通过纵向和横向能量分布的参数化将模拟时间减少了一个数量级，并使用快速跟踪模拟引擎Fatras将模拟时间进一步减少一个数量级。最后，我们提出了新的集成仿真框架（ISF），这是基于要求，允许运行所有的模拟类型在同一个工作中，甚至在同一个子探测器，不同的粒子。ISF被设计为可扩展到新的模拟类型以及未来并行计算技术的应用。用户可以根据分析的具体物理要求轻松配置它，以找到精度和执行时间之间的最佳平衡。
Monte Carlo simulations of physics events, including detailed simulation of the detector response, are indispensable for every analysis of high-energy physics experiments. As these simulated data sets must be both large and precise, their production is a CPU-intensive task. Increasing the recorded luminosity at the Large Hadron Collider (LHC), and hence the amount of data to be analyzed, leads to a steadily rising demand for simulated MC statistics for systematics and background studies. These huge MC requirements for more refined physics analyses can only be met through the implementation of fast simulation strategies which enable faster production of large MC samples. ATLAS has developed full and fast detector simulation techniques to achieve this goal within the computing limits of the collaboration. We present Atlfast-II which uses the FastCaloSim package in the calorimeter and reduces the simulation time by one order of magnitude by means of parameterizations of the longitudinal and lateral energy profile, and Atlfast-IIF with the fast track simulation engine Fatras, which achieves a further simulation time reduction of one order of magnitude in the Inner Detector and Muon System. Finally we present the new Integrated Simulation Framework (ISF) which is based on the requirement to allow to run all simulation types in the same job, even within the same sub-detector, for different particles. The ISF is designed to be extensible to new simulation types as well as the application of parallel computing techniques in the future. It can be easily configured by the user to find an optimal balance between precision and execution time, according to the specific physics requirements for their analysis.