标题： VSTPOL：使VST成为光学偏振的大范围巡天望远镜 显示英文标题

标题： VSTPOL: making the VST a large survey telescope for optical polarimetry

摘要： 自2011年运行开始以来，甚大望远镜巡天望远镜（VST）一直是光学波段中最高效的宽视场成像仪之一。然而，在接下来的几年里，弗雷德·劳伦斯·惠勒天文台时域巡天（LSST）将在这一领域带来变革。因此，现在是时候通过增加使VST在特定科学案例中独一无二的功能来专门化VST了。 VSTPOL是一项旨在为VST望远镜提供宽视场偏振能力的项目，使其成为首个用于线性光学偏振的大规模巡天望远镜。实际上，尽管有许多光学望远镜，但提供偏振仪器的望远镜却很少。相对较大的反射镜偏振望远镜数量不多，尽管它们在支持例如切伦科夫望远镜阵列（CTA）的许多科学案例时会特别需要，而CTA在南半球与VST共址。 VST望远镜配备了一台仪器，即OmegaCAM宽视场成像相机，在可见光波段工作，视场为1$^\circ\times1^\circ$。偏振模式将通过安装在场改正镜光学上的大型可旋转偏振器实现，该偏振器可以与非偏振改正镜光学交换。由于大气条件和仪器偏振的变化导致的极限偏振系统误差可以通过利用每个视场内的大量非偏振恒星来校正到$\sim10^{-3}$的水平。 从用户的角度来看，VSTPOL将是VST宽视场成像相机的一个附加模式。 显示英文摘要

摘要： Since the start of operations in 2011, the VLT Survey Telescope (VST) has been one of the most efficient wide-field imagers in the optical bands. However, in the next years the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will be a game-changer in this field. Hence, the timing is appropriate for specializing the VST with additions that can make it unique in well-defined scientific cases. VSTPOL is a project that aims to provide the addition of wide-field polarimetric capabilities to the VST telescope, making it the first large survey telescope for linear optical polarimetry. Actually, while there are quite a number of optical telescopes, the telescopes providing polarimetric instrumentation are just a few. The number of relatively large mirror polarimetric telescopes is small, although they would be specifically needed e.g. to support many science cases of the Cherenkov Telescope Array (CTA) that, in the southern hemisphere, is co-located with the VST. The VST telescope is equipped with a single instrument, the OmegaCAM wide-field imaging camera operating in the visible bands with a field of view of 1$^\circ\times1^\circ$. The polarimetric mode will be implemented through the insertion of a large rotatable polarizer installed on the field-corrector optics, which will be exchangeable with the non-polarimetric corrector optics. The limiting polarimetric systematic errors due to variable atmospheric conditions and instrumental polarization can be corrected down to a level of $\sim10^{-3}$ by leveraging the large amount of unpolarized stars within each field-of-view. By the user point of view, VSTPOL will be an additional mode for the VST wide-field imaging camera.