Antonio Cesar de Oliveira, James E. Gunn, Ligia Souza de Oliveira, Marcio Vital de Arruda, Lucas Souza Marrara, Leandro Henrique dos Santos, Décio Ferreira, Jes… 展开作者
Antonio Cesar de Oliveira, James E. Gunn, Ligia Souza de Oliveira, Marcio Vital de Arruda, Lucas Souza Marrara, Leandro Henrique dos Santos, Décio Ferreira, Jesulino Bispo dos Santos, Josimar Aparecido Rosa, Flavio Felipe Ribeiro, Rodrigo de Paiva Vilaça, Orlando Verducci Junior, Laerte Sodré Junior, Claudia Mendes de Oliveira
The Fiber Optical Cable and Connector System, FOCCoS, subsystem of the Prime Focus Spectrograph, PFS, for Subaru telescope, is responsible to feed four spectrographs with a set of optical fibers cables. The light injection for each spectrograph is assured by a convex curved slit with a linear array of 616 optical fibers. In this paper we present a design of a slit that ensures the right direction of the fibers by using masks of micro holes. This kind of mask is made by a technique called electroforming, which is able to produce a nickel plate with holes in a linear sequence. The precision error is around 1micron in the diameter and 1 micron in the positions of the holes. This nickel plate may be produced with a thickness between 50 and 200 microns, so it may be very flexible. This flexibility allows the mask to be bent into the shape necessary for a curved slit. The concept requires two masks, which we call Front Mask, and Rear Mask, separated by a gap that defines the thickness of the slit. The pitch and the diameter of the holes define the linear geometry of the slit; the curvature of each mask defines the angular geometry of the slit. Obviously, this assembly must be mounted inside a structure rigid and strong enough to be supported inside the spectrograph. This structure must have a CTE optimized to avoid displacement of the fibers or increased FRD of the fibers when the device is submitted to temperatures around 3 degrees Celsius, the temperature of operation of the spectrograph. We have produced two models. Both are mounted inside a very compact Invar case, and both have their front surfaces covered by a dark composite, to reduce stray light. Furthermore, we have conducted experiments with two different internal structures to minimize effects caused by temperature gradients.
Multi-fibers connectors systems for FOCCoS-PFS-Subaru
光纤电缆和连接器系统（FOCCoS）通过光纤电缆在2400个定位器和一组光谱仪之间提供光学连接，作为斯巴鲁望远镜PFS仪器的一部分。光纤电缆将沿路线分为3部分，电缆A、电缆B和电缆C，通过一组多光纤连接器连接。USCONEC公司生产研究中的多光纤连接器。USCONEC 32 F型号可以连接32根光纤，采用4 x 8矩阵排列。套圈由耐用的复合材料聚苯硫醚（PPS）基热塑性塑料制成。连接通过一个推/拉闩锁固定到位，连接器也可以通过从连接器前部突出的一对金属导销来区分。每个连接器将使用两根光纤监测连接程序。它被发现很容易抛光，而且它足够小，可以成组安装。像PFS这样的高度多路复用的仪器需要一个光纤连接器系统，可以提供出色的光学性能和可靠性。PFS需要两种不同类型的结构来组织连接器。塔连接器系统包括80个多光纤连接器，是一组连接器，用于连接电缆B（望远镜结构）和电缆C（定位器板）。Gang连接器系统是一组8个Gang连接器，每个连接器有12个多光纤连接器，用于连接电缆B（望远镜结构）和电缆A（光谱仪）。这些连接器系统和所选光纤的台架测试应测量光的吞吐量以及多次连接和断开后的稳定性。在本文中，我们描述了测试和程序来评估吞吐量和FRD增量。套圈的寿命也在评估中。
Focal Plane Alignment and Detector Characterization for the Subaru Prime Focus Spectrograph
我们描述的基础设施正在开发的斯巴鲁测量图像和红移（SuMIRe）的主要焦点光谱仪（PFS）的检测器对齐和表征。PFS将采用四台三通道光谱仪，工作波长范围为3800 $Å$至12600 $Å$。每个光谱仪将由两个可见光通道和一个近红外（NIR）通道组成，其中每个通道将使用单独的施密特相机将捕获的光谱成像到各自的探测器上。在可见光通道中，Hamamatsu 2k x 4k CCD将成对安装，以创建单个4k x 4k探测器，而NIR通道将使用单个Teledyne 4k x 4k H4RG HgCdTe设备。
Studying focal ratio degradation of optical fibers for Subaru Prime Focus Spectrograph
聚焦比退化（FRD）是由纤维光学引起的光角分布的变化。FRD对于光纤馈电的光谱天文系统很重要，因为它会导致信号丢失、光谱分辨率下降或光谱仪设计复杂性增加。Nacional de Astrofísica（LNA）开发了一种系统，可以准确和精确地测量FRD，使用绝对方法，也可以测量光纤吞吐量。本文介绍了计量系统，并显示了Polymicro纤维FBP129168190，FBP127165190和藤仓纤维128170190的测量。虽然这两种光纤的FRD很低，并且彼此相似，但了解这些光纤的确切特性非常重要，因为它们都将用于建造FOCCoS（光纤电缆和连接器系统），用于安装在斯巴鲁望远镜上的PFS（主焦点光谱仪）。
Prime Focus Spectrograph on the Subaru Telescope: Overview of Science Operations
National Astronomical Observatory of Japan（日本国立天文台）；Graduate Institute for Advanced Studies, SOKENDAI（综合研究大学院大学）；Subaru Telescope, National Astronomical Observatory of Japan（昴星团望远镜，日本国立天文台）
Focal ratio degradation for fiber positioner operation in astronomical spectrographs
焦比退化（FRD）是光纤输入端和输出端之间光焦比的增加，它对天文摄谱仪的吞吐量和点扩散函数有重要影响。然而，虽然FRD是许多光纤特性的函数，例如应力、微弯曲和表面缺陷，但入射光与光纤表面之间的角度不对准也会影响光分布并使测量复杂化。一个紧凑的实验装置和一个模型分离FRD从角度失调被施加到光纤受到不同的应力或角度失调，以确定这些影响的大小。然后确定光纤定位器中光纤的FRD，该光纤定位器将用于Subaru Prime Focus摄谱仪（PFS）。我们对PFS定位器进行的分析表明，角偏差的影响占主导地位，应力不会导致FRD显著增加。
