21 August 2009 Toroidal variable-line-space gratings: the good, the bad, and the ugly
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Toroidal variable-line-space (VLS) gratings are very important in the design of an efficient VUV solar telescope that will measure the CIV (155nm) and MgII (280nm) emissions lines in the Sun's transition region. In 1983 Kita and Harada described spherical VLS gratings but the technology to commercially fabricate these devices is a recent development, especially for toroidal surfaces. This paper will describe why this technology is important in the development of the Solar Ultraviolet Magnetograph Investigation (SUMI) sounding rocket program (the good), the delays due to the conversion between the TVLS grating design and the optical fabrication (the bad), and finally the optical testing, alignment and tolerancing of the gratings (the ugly).
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Edward West, Edward West, Ken Kobayashi, Ken Kobayashi, Jonathan Cirtain, Jonathan Cirtain, Allen Gary, Allen Gary, John Davis, John Davis, Joseph Reader, Joseph Reader, "Toroidal variable-line-space gratings: the good, the bad, and the ugly", Proc. SPIE 7433, Optical System Alignment, Tolerancing, and Verification III, 74330I (21 August 2009); doi: 10.1117/12.825709; https://doi.org/10.1117/12.825709

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