SDO-EVE multiple EUV grating spectrograph (MEGS) optical design
SDO-EVE multiple EUV grating spectrograph (MEGS) optical design
复制标题
SDO-EVE 多重 EUV 光栅光谱仪 (MEGS) 光学设计
DOI：
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发表时间：
2004
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影响因子：
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通讯作者：
D. Weitz
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文献类型：
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作者：
D. Crotser;T. Woods;F. Eparvier;G. Ucker;R. Kohnert;G. Berthiaume;D. Weitz
美国国家航空航天局的太阳动力学观测站（SDO）计划于2008年发射，它包含了包括EUV变异性实验（EVE）在内的一套仪器。EVE仪器包包含光栅光谱仪，用于测量0.1至105 nm的太阳极紫外（EUV）辐照度。多EUV光栅光谱仪（MEGS）通道使用凹反射光栅将太阳光谱成像到在-100°C下工作的ccd上。MEGS每10秒提供5-105nm之间的0.1nm光谱分辨率，绝对精度优于SDO 5年任务的25%。mgs - a采用独特的掠射，离罗兰圆（RC）设计，以最大限度地减少探测器的入射角，同时满足高分辨率要求。mgs - b采用双通，交叉分散双罗兰圆设计。MEGS-P是一种Ly-α监测器，将在60-105 nm范围内提供代理模型校准。最后，太阳面向监测（SAM）通道将为EVE提供连续的指向信息以及太阳的低分辨率x射线图像。MEGS的飞行校准将由机载EUV分光光度计（ESP）在0.1-7nm和17-37nm范围内提供，以及每年的飞行下火箭实验。我们提出了用于开发MEGS光学设计的方法。
The NASA Solar Dynamics Observatory (SDO), scheduled for launch in 2008, incorporates a suite of instruments including the EUV Variability Experiment (EVE). The EVE instrument package contains grating spectrographs used to measure the solar extreme ultraviolet (EUV) irradiance from 0.1 to 105 nm. The Multiple EUV Grating Spectrograph (MEGS) channels use concave reflection gratings to image solar spectra onto CCDs that are operated at -100°C. MEGS provides 0.1nm spectral resolution between 5-105nm every 10 seconds with an absolute accuracy of better than 25% over the SDO 5-year mission. MEGS-A utilizes a unique grazing-incidence, off-Rowland circle (RC) design to minimize angle of incidence at the detector while meeting high resolution requirements. MEGS-B utilizes a double-pass, cross-dispersed double-Rowland circle design. MEGS-P, a Ly-α monitor, will provide a proxy model calibration in the 60-105 nm range. Finally, the Solar Aspect Monitor (SAM) channel will provide continual pointing information for EVE as well as low-resolution X-ray images of the sun. In-flight calibrations for MEGS will be provided by the on-board EUV Spectrophotometer (ESP) in the 0.1-7nm and 17-37nm ranges, as well as from annual under-flight rocket experiments. We present the methodology used to develop the MEGS optical design.