The fifth Sloan Digital Sky Survey Local Volume Mapper (LVM) is a wide-field integral field unit survey that uses an array of four 160 mm fixed telescopes with siderostats to minimize the number of moving parts. An individual telescope observes the science or calibration field independently and is synchronized with the science exposure. We developed the LVM Acquisition and Guiding Package (LVMAGP)-optimized telescope control software program for LVM observations, which can simultaneously control four focusers, three K-mirrors, one fiber selector, four mounts (siderostats), and seven guide cameras. This software is built on a hierarchical architecture and the SDSS framework and provides three key sequences: autofocus, field acquisition, and autoguide. We designed and fabricated a proto-model siderostat to test the telescope pointing model and LVMAGP software. The mirrors of the proto-model were designed as an isogrid open-back type, which reduced the weight by 46% and enabled reaching thermal equilibrium quickly. In addition, deflection due to bolting torque, self-gravity, and thermal deformation was simulated, and the maximum scatter of the pointing model induced by the tilt of optomechanics was predicted to be 4′.4, which can be compensated for by the field acquisition sequence. We performed a real sky test of LVMAGP with the proto-model siderostat and obtained field acquisition and autoguide accuracies of 0″.38 and 1″.5, respectively. It met all requirements except for the autoguide specification, which will be resolved by more precise alignment among the hardware components at Las Campanas Observatory.

中文翻译：

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用于 SDSS-V 本地体积映射器的望远镜控制软件和原型侧控器


第五个斯隆数字巡天局部体积测绘仪 (LVM) 是一种宽视场整体现场单位巡天，使用四个 160 毫米固定望远镜阵列和侧沉箱，以最大程度地减少移动部件的数量。单个望远镜独立观察科学或校准场，并与科学曝光同步。我们开发了用于 LVM 观测的 LVM 采集和引导包 (LVMAGP) 优化望远镜控制软件程序，该程序可以同时控制 4 个聚焦器、3 个 K 镜、1 个光纤选择器、4 个安装座（侧控器）和 7 个引导相机。该软件建立在分层架构和 SDSS 框架之上，提供三个关键序列：自动对焦、现场采集和自动引导。我们设计并制造了一个原型模型来测试望远镜指向模型和 LVMAGP 软件。原型模型的镜子被设计为等网格开放式，重量减轻了46%，并且能够快速达到热平衡。此外，还模拟了由于螺栓扭矩、自重力和热变形引起的偏转，预测光力学倾斜引起的指向模型的最大散射为4′.4，可以通过场补偿采集序列。我们使用原型模型siderostat对LVMAGP进行了真实的天空测试，并获得了分别为0英寸.38和1英寸.5的现场采集和自动引导精度。它满足除自动引导规范之外的所有要求，这将通过拉斯坎帕纳斯天文台的硬件组件之间更精确的对齐来解决。