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arXiv 2008.06454astro-ph.IM
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利用先前计算的微观模拟从广泛的空气簇射合成无线电信号

Synthesis of radio signals from extensive air showers using previously computed microscopic simulations

Matias Tueros, Anne Zilles

摘要:

通过射电信号探测广泛的空气簇射(EAS)正成为研究最高能量中微子和宇宙射线的最有前途的技术之一。为了设计、优化和表征无线电阵列及其相关的重构算法,需要进行成千上万次的蒙特卡罗模拟。目前可用的模拟代码可能需要几天时间来计算单个淋浴产生的信号,使得不可能以具有成本效益和环境意识的方式在合理的时间内产生所需的模拟。在这篇文章中,我们提出了一种方法来合成预期的信号(全时间跟踪,而不仅仅是峰值振幅)在任何一点周围的簇射核心,给定一组信号模拟在有限数量的天线战略定位在一个模式,利用无线电波前的签名功能。该方法可以在三个极化方向上模糊地应用于电场或天线对电场的响应。合成信号可用于评估触发条件,计算通量或重建簇射入射方向,允许产生一个单一的模拟库,该模拟库可用于和重新用于无线电阵列及其相关重建方法的表征和优化,其时间为所需CPU时间的千分之一。

英文摘要:

The detection of extensive air showers (EAS) through their radio signal is becoming one of the most promising techniques for the study of Neutrinos and Cosmic rays at the highest energies. For the design, optimization and characterization of radio arrays, and of their associated reconstruction algorithms, tens of thousands of Monte Carlo simulations are needed. Current available simulation codes can take several days to compute the signals produced by a single shower, making it impossible to produce the required simulations in a reasonable amount of time, in a cost-effective and environmental-conscious way. In this article we present a method to synthesize the expected signals (the full time trace, not just the peak amplitude) at any point around the shower core, given a set of signals simulated in a finite number of antennas strategically located in a pattern that exploits the signature features of the radio wavefront. The method can be applied indistinctly to the electric field or to the antenna response to the electric field, in the three polarization directions. The synthesized signal can be used to evaluate trigger conditions, compute the fluence or reconstruct the shower incoming direction, allowing for the production of one single library of simulations that can be used and re-used for the characterization and optimization of radio arrays and their associated reconstruction methods, for a thousandth part of the otherwise required CPU time.

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