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首页> 外文会议>Conference on damage to VUV, EUV, and X-ray optics VI >Study of Performance Loss of Lyman Alpha Filters due to Chemical Contamination
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Study of Performance Loss of Lyman Alpha Filters due to Chemical Contamination

机译：莱曼α滤波器性能损失的研究由于化学污染

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Observations in the UV and EUV allow many diagnostics of the outer layers of the stars and the Sun so that more and more space telescopes are developed to operate in this fundamental spectral range. However, absorption by residual contaminants coming from polymers outgassing causes critical effects such as loss of signal, spectral shifts, stray light... Thus, a cleanliness and contamination control plan has to be defined to mitigate the risk of damage of sensitive surfaces. In order to specify acceptable cleanliness levels, it is paramount to improve our knowledge and understanding of contamination effects, especially in the UV/EUV range. Therefore, an experimental study has been carried out in collaboration between CNES and IAS, in the frame of the development of the Extreme UV Imager suite for the ESA Solar Orbiter mission; this instrument consists of two High Resolution Imagers and one Full Sun Imager designed for narrow pass-band EUV imaging of the solar corona, and thus very sensitive to contamination. Here, we describe recent results of performance loss measured on representative optical samples. Six narrow pass-band filters, with a multilayer coating designed to select the solar Lyman Alpha emission ray, were contaminated with different amounts of typical chemical species. The transmittance spectra were measured between 100 and 200 nm under high vacuum on the SOLEIL synchrotron beam line. They were compared before and after contamination, and also after a long exposure of the contaminated area to EUV-visible radiations.
机译：UV和EUV中的观察允许恒星和太阳的外层的许多诊断，以便开发出越来越多的太空望远镜在该基本光谱范围内运行。然而，来自聚合物除气的残留污染物的吸收导致诸如信号损失，光谱偏移，杂散光的临界影响，因此必须定义清洁和污染控制计划以减轻敏感表面损坏的风险。为了指定可接受的清洁度水平，最重要的是提高我们对污染效应的知识和理解，特别是在UV / EUV范围内。因此，在CNES和IAS之间进行了一个实验研究，在ESA太阳能轨道特派团的极端UV成像套件的开发框架中进行了合作;该仪器由两个高分辨率成像仪和一个设计用于太阳电晕的窄通带EUV成像，因此对污染非常敏感。在这里，我们描述了在代表性光学样本上测量的最近性能损失的结果。六个窄通带滤光器，具有旨在选择太阳能Lymanα发射射线的多层涂层，被不同量的典型化学物质进行污染。在SOLEIL同步梁线上的高真空下在100至200nm之间测量透射率光谱。它们在污染之前和之后进行比较，并且在长时间暴露于污染区域到EUV可见辐射。

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