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CTA天文台拉曼激光雷达的发展现状和动机

Status and motivation of Raman LIDARs development for the CTA Observatory

M. Doro, M. Gaug, J. Pallotta, G. Vasileiadis, O. Blanch, F. Chouza, R. D'Elia, A. Etchegoyen, Ll. Font, D. Garrido, F. Gonzales, A. López-Oramas, M. Martínez, … 展开作者

M. Doro, M. Gaug, J. Pallotta, G. Vasileiadis, O. Blanch, F. Chouza, R. D'Elia, A. Etchegoyen, Ll. Font, D. Garrido, F. Gonzales, A. López-Oramas, M. Martínez, L. Otero, E. Quel, P. Ristori

摘要:

切伦科夫望远镜阵列(CTA)是下一代成像大气切伦科夫望远镜。它将在甚高能伽马射线天文学中达到前所未有的灵敏度和能量分辨率。为了达到这些目标,应将由变化的大气条件引起的系统不确定性减至最低。不同的工具可能有助于解释这些不确定性。CTA联盟中的几个小组目前正在建造安装在CTA站点的拉曼激光雷达。拉曼激光雷达是由射入大气的强大激光器,收集分子和气溶胶反向散射光的收集器,光电传感器,光谱选择感兴趣波长的光学模块和读出系统组成的设备。拉曼激光雷达可以将伽马射线能量重建的系统不确定性降低到5%的水平。所有拉曼激光雷达的主题,这项工作,有设计特点,使他们不同于典型的拉曼激光雷达在大气科学中使用,其特点是大收集镜($\sim2~$ m $^2$)。它们具有多个弹性和拉曼读出通道(至少4个)和定制的光学设计。本文介绍了拉曼激光雷达产生的动机、设计方法和发展现状。

英文摘要:

The Cherenkov Telescope Array (CTA) is the next generation of Imaging Atmospheric Cherenkov Telescopes. It would reach unprecedented sensitivity and energy resolution in very-high-energy gamma-ray astronomy. In order to reach these goals, the systematic uncertainties derived from the varying atmospheric conditions shall be reduced to the minimum. Different instruments may help to account for these uncertainties. Several groups in the CTA consortium are currently building Raman LIDARs to be installed at the CTA sites. Raman LIDARs are devices composed of a powerful laser that shoots into the atmosphere, a collector that gathers the backscattered light from molecules and aerosols, a photosensor, an optical module that spectrally select wavelengths of interest, and a read-out system. Raman LIDARs can reduce the systematic uncertainties in the reconstruction of the gamma-ray energies down to 5 % level. All Raman LIDARs subject of this work, have design features that make them different than typical Raman LIDARs used in atmospheric science, and are characterized by large collecting mirrors ($\sim2~$m$^2$). They have multiple elastic and Raman read-out channels (at least 4) and custom-made optics design. In this paper, the motivation for Raman LIDARs, the design and the status of advance of these technologies are described.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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