Journal article
Adjustable X-ray optics: thin-film actuator measurement and figure correction performance
Journal of astronomical telescopes, instruments, and systems, Vol.10(3), 039003
08/02/2024
DOI: 10.1117/1.JATIS.10.3.039003
Abstract
Several proposed future X-ray missions will require thin (≤0.5mm thick) mirrors with precise surface figures to maintain high angular resolution (≤0.5arcsec). To study methods of meeting these requirements, adjustable X-ray optics have been fabricated with thin-film piezoelectric actuators to perform figure correction. The fabrication and actuator performance for an adjustable X-ray mirror that forms a conical approximation to a Wolter-I telescope are reported. The individual responses of actuator cells were measured and shown to induce a figure change of 870 nm peak-to-valley on average. These measured responses were compared with predicted responses generated using a finite-element analysis algorithm. On average, the measured and predicted cell responses agreed to within 60 nm root mean square. A set of representative mirror distortions and the measured cell responses were used to simulate figure corrections and calculate the half-power diameter (HPD, single reflection at 1 keV) achieved. These simulations showed an improvement in 4.5 to 9 arcsec mirrors to 0.5 to 1.5 arcsec HPD. The disagreements between the predicted and measured cells’ performance in actuation and figure correction were attributed to a high spatial frequency metrology error and differences in mirror bonding considerations between the finite-element analysis model and the as-built mirror mount.
Details
- Title: Subtitle
- Adjustable X-ray optics: thin-film actuator measurement and figure correction performance
- Creators
- Kenneth Buffo - University of IowaCasey DeRoo - University of IowaPaul Reid - Center for Astrophysics Harvard & SmithsonianVladimir Kradinov - Center for Astrophysics Harvard & SmithsonianVanessa Marquez - Center for Astrophysics Harvard & SmithsonianSusan Trolier-McKinstry - Pennsylvania State UniversityNathan Bishop - Pennsylvania State UniversityThomas N. Jackson - Pennsylvania State UniversityQuyen Tran - Pennsylvania State UniversityHanyuan Liang - Pennsylvania State UniversityMohit Tendulkar - Pennsylvania State University
- Resource Type
- Journal article
- Publication Details
- Journal of astronomical telescopes, instruments, and systems, Vol.10(3), 039003
- Publisher
- SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
- DOI
- 10.1117/1.JATIS.10.3.039003
- ISSN
- 2329-4124
- eISSN
- 2329-4221
- Grant note
- NASA FINESST: 80NSSC23K1483
This work was supported by NASA awards NNX17AF66G, 80NSSC19K0234, and 80NSSC19K0371. K.B. acknowledges the support of NASA FINESST (Grant No. 80NSSC23K1483), funding from the Iowa Space Grant Consortium Graduate Student Fellowship, and internal funding from the University of Iowa. K.B. acknowledges that some of the results presented in this paper were previously published in an SPIE Proceedings paper.37
- Language
- English
- Date published
- 08/02/2024
- Academic Unit
- Physics and Astronomy; University College Courses
- Record Identifier
- 9984696659202771
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