[P-CG20] 宇宙・惑星探査の将来計画および関連する機器開発の展望

[PCG20-10] Instrument overview and key technology developments for the LAPYUTA mission and beyond

*村上 豪¹、土屋 史紀²、山崎 敦¹、鍵谷 将人²、亀田 真吾³、吉岡 和夫⁴、木村 智樹⁵、桑原 正輝³ (1.宇宙航空研究開発機構宇宙科学研究所、2.東北大学大学院理学研究科惑星プラズマ・大気研究センター、3.立教大学、4.東京大学大学院新領域創成科学研究科、5.東京理科大学)

キーワード：紫外線、望遠鏡、分光、撮像

The Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly (LAPYUTA) mission aims to carry out spectroscopy with a large effective area (>300 cm2) and a high spatial resolution (0.1 arc-sec) and imaging in far ultraviolet spectral range (110-190 nm) from a space telescope. The main part of the science payload is a Cassegrain-type telescope with a 60 cm-diameter primary mirror. As a current design, three main UV instruments are installed on the focal plane of the telescope: a mid-dispersion spectrograph, a high-dispersion spectrograph, and a slit imager. The mid-dispersion spectrograph contains a movable slit with different slit width, a holographic toroidal grating with 2110 lines/mm, and an MCP detector coupled with CMOS imaging sensors. Spectral resolution of 0.02 nm and field-of-view of 100 arc-sec will be achieved. The high-dispersion spectrograph consists of a slit, a toroidal mirror, an echelle gating, a cross disperser, and a detector. Highest spectral resolution of 3 pm will be achieved at the target wavelength (130.5 nm). The UV slit imager consists of imaging optics, several bandpass filters with a rotation wheel, and a same type of UV detector as the one installed in the spectrometer. In order to achieve a high spatial resolution of 0.1 arc-sec, we will install a target monitoring camera at 0^th order position inside the spectrometer and slit imager for both attitude control and image accumulation process. We also plan to install a fine guidance sensor to monitor guidance stars. In addition, new key technologies such as funnel-type MCPs and CMOS-coupled readout system and highly reflective UV coating will be applied to satisfy requirements of LAPYUTA. These key technologies can be applied to the future international flagship missions such as Habitable World Observatory. Here we present the LAPYUTA concept design, the overview of the spacecraft and instruments, and the status of key technology developments.