Improving X-Ray Optics via Differential Deposition

Differential deposition, a post-fabrication figure correction technique, has the potential to significantly improve the imaging quality of grazing-incidence X-ray optics. DC magnetron sputtering is used to selectively coat the mirror in order to minimize the figure deviations. Custom vacuum chambers have been developed at NASA MSFC that will enable the implementation of the deposition on X-ray optics. A factor of two improvement has been achieved in the angular resolution of the full-shell X-ray optics with first stage correction of differential deposition. Current efforts are focused on achieving higher improvements through efficient implementation of differential deposition

The Development of a Deflectometer for Accurate Surface Figure Metrology

Marshall Space Flight Center is developing the method of direct fabrication for high resolution full-shell x-ray optics. In this technique the x-ray optics axial profiles are figured and polished using a computer-controlled ZeekoIRP600X polishing machine. Based on the Chandra optics fabrication history about one third of the manufacturing time is spent on moving a mirror between fabrication and metrology sites, reinstallation and alignment with either the metrology or fabrication instruments. Also, the accuracy of the alignment significantly affects the ultimate accuracy of the resulting mirrors. In order to achieve higher convergence rate it is highly desirable to have a metrology technique capable of in situ surface figure measurements of the optics under fabrication, so the overall fabrication costs would be greatly reduced while removing the surface errors due to the re-alignment necessary after each metrology cycle during the fabrication. The goal of this feasibility study is to demonstrate if the Phase Measuring Deflectometry can be applied for in situ metrology of full shell x-ray optics. Examples of the full-shell mirror substrates suitable for the direct fabricatio

Differential Deposition for Surface Figure Corrections in Grazing Incidence X-Ray Optics

Differential deposition corrects the low- and mid- spatial-frequency deviations in the axial figure of Wolter-type grazing incidence X-ray optics. Figure deviations is one of the major contributors to the achievable angular resolution. Minimizing figure errors can significantly improve the imaging quality of X-ray optics. Material of varying thickness is selectively deposited, using DC magnetron sputtering, along the length of optic to minimize figure deviations. Custom vacuum chambers are built that can incorporate full-shell and segmented Xray optics. Metrology data of preliminary corrections on a single meridian of full-shell x-ray optics show an improvement of mid-spatial frequencies from 6.7 to 1.8 arc secs HPD. Efforts are in progress to correct a full-shell and segmented optics and to verify angular-resolution improvement with X-ray testing

Differential Deposition: A Post-Fabrication Figure Correction for Grazing Incidence X-Ray Optics.

No abstract availabl

The Ursinus Weekly, March 4, 1957

Forum on student government scheduled for 8:00 tonight • March 15 date for annual show by students, faculty • Girls to discuss May Day on Wed. • Motion pictures viewed by Chemical Society • Chi Alpha schedules talk on integration • Curtain Club presents The Valiant, Feb. 26 • UC grad completes basic • Mary Jo Turtzo to represent UC in Glamour contest • Cub & Key Society requests outlines from junior men • 1957 Campus Chest fund drive • Annual drive begins today, closes on Friday, March 15 • YM-YW to sponsor music seminar; Begins Wednesday • YM-YW sponsor events for frosh • Local Rotarians set up scholarship to Ursinus • Frosh to present dance, The Golden nugget, Sat. • US foreign policy to be IRC program tonight • Editorial: Life for our organizations; It goes without saying • Letters to the editor • Obituary for a timid intellectual • Play review: The Valiant • He who hesitates • Ursinus five loses to Drexel, PMC; End with second worst slate, 0-16 • Belles top E. Stroudsburg; Win over William & Mary on weekend trip south • Padula emerges 4-year M. Atlantic champ; Wins second outstanding athlete award • Matmen gain first place tie with win over Drexel, 19-13 • Inside report on winless Bruinshttps://digitalcommons.ursinus.edu/weekly/1423/thumbnail.jp

The Grizzly, March 25, 1983

New Editors Elected: Romer, Hong, Pasekoff Named • Superstars Tournament Needs Participants • DuPont Gives Third Consecutive Chemistry Grant • The A\u27s Come to UC • Third Annual Special Olympics This Weekend • Summer in Japan • Folk Singers at Bomberger • Letters to the Editor: An Epilogue to Zeta Chi • USGA Holds Election • USGA Notes • Voight at Bat • 13 Spend Break in Quebec • To Hell With the USFL • College Bowl Goes to Maryland • 1983 Room Selection Procedure • Bear\u27s Den Replaces Cafe International • Cycling Marathon: Ride for Your Life • Men\u27s Lacrosse Slow Getting Started • Men\u27s and Women\u27s Track Win Openershttps://digitalcommons.ursinus.edu/grizzlynews/1097/thumbnail.jp

Improving X-ray Optics Through Differential Deposition

The differential deposition technique can in theory correct shell figures to approximate arcsecond value. We have received APRA funding and are building two custom system to demonstrate the technique on full shell and segmented optics. We hope to be able to demonstrate < 5 arcsec performance in < 2 years. To go beyond this, (arcsecond level) is very difficult to judge as we have not yet discovered the problems. May necessitate in-situ metrology, stress reduction investigations, correcting for gravity effects, correcting for temperature effects. Some of this will become obvious in early parts of the investigation

Progress in Differential Deposition for Improving the Figures of Full-Shell Astronomical Grazing Incidence X-Ray Optics

No abstract availabl