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Hyper Suprime-Cam: Camera dewar design

机译：Hyper Suprime-Cam：杜瓦设计相机

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This paper describes the detailed design of the CCD dewar and the camera system which is a part of the wide-field imager Hyper Suprime-Cam (HSC) on the 8.2?m Subaru Telescope. On the 1.°5 diameter focal plane (497?mm in physical size), 116 four-side buttable 2?k?×?4?k fully depleted CCDs are tiled with 0.3?mm gaps between adjacent chips, which are cooled down to ?100°C by two pulse tube coolers with a capability to exhaust 100?W heat at ?100°C. The design of the dewar is basically a natural extension of Suprime-Cam, incorporating some improvements such as (1) a detailed CCD positioning strategy to avoid any collision between CCDs while maximizing the filling factor of the focal plane, (2) a spherical washers mechanism adopted for the interface points to avoid any deformation caused by the tilt of the interface surface to be transferred to the focal plane, (3) the employment of a truncated-cone-shaped window, made of synthetic silica, to save the back focal space, and (4) a passive heat transfer mechanism to exhaust efficiently the heat generated from the CCD readout electronics which are accommodated inside the dewar. Extensive simulations using a finite-element analysis (FEA) method are carried out to verify that the design of the dewar is sufficient to satisfy the assigned errors. We also perform verification tests using the actually assembled CCD dewar to supplement the FEA and demonstrate that the design is adequate to ensure an excellent image quality which is key to the HSC. The details of the camera system, including the control computer system, are described as well as the assembling process of the dewar and the process of installation on the telescope.
机译：本文介绍了CCD杜瓦瓶和照相机系统的详细设计，该系统是8.2μm斯巴鲁望远镜上广角成像仪Hyper Suprime-Cam（HSC）的一部分。在直径为1.°5的焦平面（物理尺寸为497？mm）上，对116块四面可倾斜2？k？×？4？k CCD进行平铺，相邻芯片之间的间隙为0.3？mm，然后冷却通过两个脉冲管冷却器将温度降至100°C，能够在100°C时排出100W的热量。杜瓦瓶的设计基本上是Suprime-Cam的自然扩展，并进行了一些改进，例如（1）详细的CCD定位策略，以避免CCD之间的任何碰撞，同时最大化焦平面的填充系数，（2）球形垫圈界面点采用了一种机制，以避免由于界面表面的倾斜而引起的任何变形，从而将其转移到焦平面上;（3）使用由合成石英制成的圆锥形圆锥形窗口，以节省后焦距空间;（4）无源传热机制，可有效地排出杜瓦瓶内部容纳的CCD读出电子设备产生的热量。使用有限元分析（FEA）方法进行了广泛的仿真，以验证杜瓦瓶的设计足以满足指定的误差。我们还使用实际组装的CCD杜瓦瓶进行了验证测试，以补充FEA，并证明该设计足以确保出色的图像质量，这是HSC的关键。描述了包括控制计算机系统在内的照相机系统的详细信息，以及杜瓦瓶的组装过程和在望远镜上的安装过程。

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