NDLI: An investigation of differential deposition for figure corrections in full-shell grazing-incidents x-ray optics

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An investigation of differential deposition for figure corrections in full-shell grazing-incidents x-ray optics

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gubarev, Mikhail V. Kilaru, Kirenmayee Ramsey, Brian D.
Copyright Year	2009
Description	We are investigating differential deposition as a way of correcting small figure errors inside full-shell grazing-incidence x-ray optics. The optics in our study are fabricated using the electroformed-nickel-replication technique, and the figure errors arise from fabrication errors in the mandrel, from which the shells are replicated, as well as errors induced during the electroforming process. Combined, these give sub-micron-scale figure deviations which limit the angular resolution of the optics to approx. 10 arcsec. Sub-micron figure errors can be corrected by selectively depositing (physical vapor deposition) material inside the shell. The requirements for this filler material are that it must not degrade the ultra-smooth surface finish necessary for efficient x-ray reflection (approx. 5 A rms), and must not be highly stressed. In addition, a technique must be found to produce well controlled and defined beams within highly constrained geometries, as some of our mirror shells are less than 3 cm in diameter.
File Size	3592250
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090038653
Archival Resource Key	ark:/13960/t53f9r39s
Language	English
Publisher Date	2009-09-22
Access Restriction	Open
Subject Keyword	Optics Fabrication Errors Vapor Deposition X Rays Angular Resolution Electroforming Grazing Incidence Nickel Surface Finishing X Ray Optics Deposition Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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