New prime focus rotator system for the WHT
New prime focus rotator system for the WHT
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适用于 WHT 的新型主焦点旋转系统
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Carlos Martín
中科院分区：
文献类型：
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作者：
A. San Vicente;G. Murga;I. Uriarte;David Fernández;R. Urrutia;Amaya Mugica;Ramón Campo;J. Ariño;L. de Bilbao;A. Kosmalska;G. Dalton;K. Middleton;S. Trager;J. A. L. Aguerri;J. M. Delgado Hernández;J. A. Burgal;J. Herreros;P. Bonifacio;A. Vallenari;E. Carrasco;D. Abrams;K. Dee;Emilie Lhoméh;F. Gribbin;J. Skvarc;Carlos Martín
WEAVE是一个新的宽视场多目标光谱（MOS）设施，建议用于4.2米威廉赫歇尔望远镜的主焦点。该设施包括一个新的2度视场主焦点校正器（PFC），具有1000多路复用光纤定位器，少量可单独部署的积分场单元和一个大型的单积分场单元（IFU）。IFU和MOS光纤可用于向双光束摄谱仪馈电，该摄谱仪将在单次曝光中以~5000的光谱分辨率提供大部分可见光谱的完全覆盖，或在两个臂中以~20000的分辨率提供适度的波长覆盖。为了补偿视场旋转，主焦点旋转器（PFR）被组装在WEAVE光纤定位器（将光纤定位在焦平面中的系统）和威廉赫歇尔望远镜（WHT）上的中央罐（包含主焦点校正器光学器件）之间。Prime Focus旋转器必须为光纤定位器提供旋转自由度，并具有高弯曲刚度（导致接口法兰之间的偏转小于0.008°），从而为系统增加尽可能小的质量（小于700 kg）。这很容易被确定为要考虑的主要设计驱动因素。Prime Focus Rotator定位光纤定位器的精度为5 arcsec，跟踪并引导所有光纤和其他电源和控制线通过电缆缠绕，可用空间有限。IDOM的建议，以符合这些耦合的要求，包括一个优化的结构系统与轻微预载交叉滚子轴承提供最高的刚度重量比。旋转由伺服驱动器提供动力的直接驱动电机驱动。对于电缆缠绕，提出了一种基于IDOM先前为GTC折叠卡塞格伦套件开发的概念的紧凑设计。
WEAVE is a new wide-field multi-object spectroscopy (MOS) facility proposed for the prime focus of the 4.2m William Herschel Telescope. The facility comprises a new 2-degree field-of-view Prime Focus Corrector (PFC) with a 1000-multiplex fibre positioner, a small number of individually deployable integral field units, and a large single integral field unit (IFU). The IFUs and the MOS fibres can be used to feed a dual-beam spectrograph that will provide full coverage of the majority of the visible spectrum in a single exposure at a spectral resolution of ~5000 or modest wavelength coverage in both arms at a resolution ~20000. In order to compensate the field rotation, the Prime Focus Rotator (PFR) is assembled in between the WEAVE Fiber Positioner (system that positions the fibers in the focal plane) and with the Central Can (contains the Prime Focus corrector optics) on the William Herschel Telescope (WHT). The Prime Focus Rotator must provide a rotation degree of freedom for the Fibre Positioner with a high bending stiffness (causing a deflection smaller than 0.008° between interface flanges) adding the minimum mass possible to the system (less than 700kg). This is easily identified as the main design driver to be considered. The Prime Focus Rotator positions the Fibre Positioner to an accuracy of 5 arcsec when tracking and guides all the fibres and other power and control lines through a cable wrap, for which the available space is limited. IDOM proposal to comply with these coupled requirements consists of an optimized structural system with a slightly preloaded cross roller bearing providing the highest possible stiffness to weight ratio. The rotation is driven by means of a direct drive motor powered by a servo drive. For the Cable Wrap, a compact design based on a concept previously developed by IDOM for the Folded Cassegrain Sets the GTC was proposed.