A sensitivity analysis of the updated optical design for EUVST on the Solar-C mission
A sensitivity analysis of the updated optical design for EUVST on the Solar-C mission
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Solar-C 任务中 EUVST 更新光学设计的灵敏度分析
DOI：
10.1117/12.2560573
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Auchere Frederic
中科院分区：
文献类型：
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作者：
Kawate Tomoko;Tsuzuki Toshihiro;Shimizu Toshifumi;Imada Shinsuke;Katsukawa Yukio;Hara Hirohisa;Suematsu Yoshinori;Ichimoto Kiyoshi;Hattori Tomoya;Narasaki Shota;Warren Harry P.;Teriaca Luca;Korendyke Clarence M.;Brown Charles;Auchere Frederic
Solar-C使命搭载的极紫外高通量光谱望远镜（EUVST）在真空紫外波段具有很宽的空间分辨率（0.4 "）。为了在JAXA Epsilon运载火箭给出的设计约束下实现高空间分辨率，我们进一步更新了光学设计，以确保在100 "×100“视场内实现0.4"空间分辨率所需的裕度。为了估计由于安装和制造误差引起的空间和光谱分辨率的误差预算，我们使用Zemax软件通过光线追踪对每个光学元件的位置和方向以及光栅参数进行了灵敏度分析。我们获得点扩散函数（PSF）的光线从9个领域和9个波长的每个探测器通过改变每个参数略有。在每个字段和波长的位置作为每个光学参数的扰动的函数的PSF的半高宽（FWHM）。假设每个光学元件的安装系统和每个光学参数的误差，我们通过考虑安装和制造误差来估计空间和光谱分辨率。灵敏度分析的结果表明，总的光学设计和装配误差的预算占我们的预算的15%和5.8%的空间分辨率在长波长和短波长波段，分别。另一方面，光栅的制造误差给空间和光谱分辨率的大的退化，和补偿器的调查，需要放宽光栅表面参数的制造公差。
The EUV high-throughput spectroscopic telescope (EUVST) onboard the Solar-C mission has the high spatial (0.4′′) resolution over a wide wavelength range in the vacuum ultraviolet. To achieve high spatial resolution under a design constraint given by the JAXA Epsilon launch vehicle, we further update the optical design to secure margins needed to realize 0.4′′ spatial resolution over a field of view of 100′′×100′′. To estimate the error budgets of spatial and spectral resolutions due to installation and fabrication errors, we perform a sensitivity analysis for the position and orientation of each optical element and for the grating parameters by ray tracing with the Zemax software. We obtain point spread functions (PSF) for rays from 9 fields and at 9 wavelengths on each detector by changing each parameter slightly. A full width at half maximum (FWHM) of the PSF is derived at each field and wavelength position as a function of the perturbation of each optical parameter. Assuming a mount system of each optical element and an error of each optical parameter, we estimate spatial and spectral resolutions by taking installation and fabrication errors into account. The results of the sensitivity analysis suggest that budgets of the total of optical design and the assembly errors account for 15% and 5.8% of our budgets of the spatial resolution in the long wavelength and short wavelength bands, respectively. On the other hand, the grating fabrication errors give a large degradation of spatial and spectral resolutions, and investigations of compensators are needed to relax the fabrication tolerance of the grating surface parameters.