ULTIMATE-Subaru: conceptual design of WFI, a near-infrared wide field imager
ULTIMATE-Subaru: conceptual design of WFI, a near-infrared wide field imager
复制标题
ULTIMATE-Subaru：近红外广域成像仪 WFI 的概念设计
DOI：
10.1117/12.2560324
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Pazder John
中科院分区：
文献类型：
--
作者：
Motohara Kentaro;Minowa Yusuke;Tanaka Ichi;Hattori Takashi;Koyama Yusei;Konishi Masahiro;Yanagisawa Kenshi;Iwata Ikuru;Wang Shiang-Yu;Chou Richard C. Y.;Kimura Masahiko;Pazder John
Results of a conceptual design study of ULTAIMTE-Wide Field Imager (WFI) is presented. ULTIMATE-WFI is a near-infrared wide-field imager for the ground-layer adaptive optics system of the Subaru telescope (ULTIMATESubaru) which realizes a 0. 002 seeing size over 200diameter at the Cassegrain focus utilizing a deformable 2ndry mirror. WFI has a 15. 07×15. 07 FoV with a wavelength coverage of 0.9–2.5µm. The FoV is covered by four identical optics, each having a square field lens with 226mm on a side. Its effective FoV is 7. 02 on a side, and is covered by a HAWAII-4RG array detector with a pixel scale of 0. 0011/pix. Effective FoV will be 14. 04×14. 04 or 2070 in total. Spot sizes at a detector plane are less than 0. 001 over the wavelength coverage. Due to the large FoV, vignetting by the telescope structure occurs and an additional cold stop is necessary to block their thermal emission, which causes ~80% vignetting at the edge of the FoV. All the optics are contained in a cylindrical structure to be installed on the Cassegrain focus of the telescope, and kept under cryogenic temperature except for the field lenses. Gravitational deformation will be smaller than 1mm, and may have negligible impact on the final image quality.
