Hyper Suprime-Cam: Camera dewar design
Hyper Suprime-Cam: Camera dewar design
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DOI：
10.1093/pasj/psx069
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发表时间：
2018
影响因子：
2.3
通讯作者：
Y. Komiyama;Y. Obuchi;H. Nakaya;Y. Kamata;S. Kawanomoto;Y. Utsumi;S. Miyazaki;F. Uraguchi;H. Furusawa;T. Morokuma;T. Uchida;H. Miyatake;S. Mineo;Hiroki Fujimori;H. Aihara;H. Karoji;J. Gunn;Shiang‐Yu Wang
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文献类型：
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作者：
Y. Komiyama;Y. Obuchi;H. Nakaya;Y. Kamata;S. Kawanomoto;Y. Utsumi;S. Miyazaki;F. Uraguchi;H. Furusawa;T. Morokuma;T. Uchida;H. Miyatake;S. Mineo;Hiroki Fujimori;H. Aihara;H. Karoji;J. Gunn;Shiang‐Yu Wang
介绍了8.2 m斯巴鲁望远镜大视场成像仪超优定焦摄像头（HSC）的CCD杜瓦片和摄像系统的详细设计。1号。°5直径焦平面（物理尺寸为497 mm）， 116个四面可连接的2k × 4k完全耗尽的ccd在相邻芯片之间铺有0.3 mm的间隙，通过两个脉冲管冷却器冷却到−100°C，能够在−100°C下排出100 W的热量。杜瓦的设计基本上是一个Suprime-Cam的自然延伸,将一些改进,如(1)详细的CCD定位策略来避免碰撞CCD焦平面的填充系数最大化时,(2)一个球面垫圈机制采用的接口点避免变形引起的界面的倾斜表面转移到焦平面,(3)的就业truncated-cone-shaped窗口,由合成二氧化硅,(4)被动传热机构，以有效地排出安置在杜瓦瓶内部的CCD读出电子设备产生的热量。利用有限元分析（FEA）方法进行了大量的仿真，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杜瓦进行验证测试，以补充有限元分析，并证明该设计足以确保出色的图像质量，这是HSC的关键。详细介绍了摄像机系统的组成，包括控制计算机系统，以及杜瓦瓶的组装过程和安装在望远镜上的过程。
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.