On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J....
-
date post
15-Jan-2016 -
Category
Documents
-
view
231 -
download
0
Transcript of On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J....
![Page 1: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/1.jpg)
On-Orbit Adjustment Calculation for the Generation-X X-ray mirror
Figure
D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P. B. Reid, S. J. Wolk, (Harvard-Smithsonian Center for Astrophysics), S. L.
O’Dell, J. K. Kolodziejczak (NASA/MSFC), W. W. Zhang (NASA/GSFC), for the Gen-X Team
SPIE Conference 7011Space Telescopes and Instrumentation II: Ultraviolet to
Gamma Ray 200824 June 2008
![Page 2: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/2.jpg)
Generation-X Science Objectives
• Detection of first black holes at z~10-20
• Evolution of Black Holes, Galaxies, Elements, from formation to the present
• Behavior of matter in extreme environments of Density, Gravity, Magnetic fields, Kinetic Energy.
![Page 3: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/3.jpg)
Key Mission Requirements:
• Large Area, ~50 m2 at 1 keV• Fine angular resolution, 0."1
![Page 4: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/4.jpg)
High Resolution Imaging enables Gen-X science objectives
![Page 5: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/5.jpg)
Wolter I Grazing Incidence X-ray reflection
![Page 6: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/6.jpg)
A Gen-X Mirror Configuration
• 204 shells, 0.2mm thick • 16m outer diameter, (partially filled)• 8.3m completely filled, 3.5m inner
diameter• 60m focal length• 1m Shell length (each, P or H), 50mm gap• 5' radius FOV• 10mm shell clearance
![Page 7: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/7.jpg)
Gen-X enabled by Ares V
![Page 8: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/8.jpg)
Adjust figure via strain parallel to reflecting surface.
![Page 9: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/9.jpg)
Ring Images (Chandra at MSFC cal facility)
![Page 10: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/10.jpg)
Profile across ring diagnosis axial quality
![Page 11: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/11.jpg)
Raytrace Study Objectives:
1. Detector requirements1. Placement
2. Resolution
2. Can we detect deviations from ideal figure?
3. Are the measurements practical?
![Page 12: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/12.jpg)
Raytrace Study
• Shells 1, 2, 203, 204• Uniform incident rays, perfect reflection• Perfect Wolter I Geometry• Perfect kinematic mounting, alignment• Trace single axial strip• Perturb surface figure by low order
Legendre Polynomials• Introduce "toy" actuators
![Page 13: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/13.jpg)
Measure ~50,000 axial positions (1cm2), ~1000 at once. 500s exposure to Sco X-1 at 2 104 s-1 gives 104 counts per azimuth per ring. Iterate 10
times at 50% duty cycle, factor 10 margin, 120day initial adjustment
Resolve 100 bins with detector resolution 10µ. Require 8.17m
forward of focus.
![Page 14: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/14.jpg)
Spacing of the figure detector to resolve 40 shells into 100 bins
![Page 15: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/15.jpg)
Ring profile for Pn distortions proportional to 0.0001/n mm.Image size in focal plane is 0."21 rms and 0."11 half-power
Ring Profile can Diagnose Figure Errors!
![Page 16: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/16.jpg)
Tilt of P to H by 1µ displaces ring by ~200 µ
![Page 17: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/17.jpg)
Poorer quality figure spreads the ring further
19" rms10" rms
4.8" rms 2.2" rms
![Page 18: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/18.jpg)
Requirements on Figuring Detector
• X-ray range ~0.2 – 4 keV• Count 2x104 s-1 per field• Resolve events to 10µm• 100mm x 100mm field• Position ~1 to 10 m forward of focus
– accuracy ~1cm axial, 1mm radial• Radial positioning knowledge better than
10 µ
![Page 19: On-Orbit Adjustment Calculation for the Generation-X X-ray mirror Figure D. A. Schwartz, R. J. Brissenden, M. Elvis, G. Fabbiano, D. Jerius, M. Juda, P.](https://reader035.fdocuments.us/reader035/viewer/2022062322/56649d5d5503460f94a3c2c5/html5/thumbnails/19.jpg)
Conclusions (so far)
• Ring Profile, Position and Spread are extremely sensitive to figure quality
• On-orbit Measurements are practical• Concept would "forward-fit" a distorted raytrace
model shell to the ring profile measurement• Actuator design is critical for
– Sufficient correction amplitude– Avoiding transfer of low spatial frequency
figure errors to higher frequencies