文献类型： 会议论文

第一作者： Fran?ois Riguet

作者： Fran?ois Riguet ¹ ;

作者机构： 1.Sagem REOSC, Avenue de la Tour Maury, 91280 Saint-Pierre-du-Perray, France

关键词： JWST;NIRSpec;TMA;as-built model

会议名称： SPIE Conference on Optical Systems Design

主办单位：

页码： 85501A-1-85501A-13

摘要： The near-infrared spectrograph (NIRSpec) is a complex instrument that will be launched on board the James Webb Space Telescope (JWST). It is composed of three three-mirror anastigmats (TMAs) made of silicon carbide (SiC). Sagem REOSC has been in charge of the mirror polishing, coating, alignment and testing, as well as cryogenic testing. The performance level and the alignment constraints, along with the polishing and alignment processes, have led to the set up of a model to accurately predict the final performances of each TMA, and minimize the risk of vignetting. The model has then been fitted to the measured parameters obtained after alignment (wavefront error, magnification or focal length...) to get an accurate modelization of the actual performances, and allow their evaluation on the full field of view. The model has been finally delivered with each TMA, as a basis for the instrument performance simulator. We will show a good correlation between the predicted performance (before alignment, obtained from individual mirror data) and the final performance (after alignment), as well as a very good fit between the as-built models and the actual TMAs.

分类号： N-532