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Fabrication and Characterization of Grids for Optical X-Ray Facility

Learn about grid fabrication and characterization of tungsten grids for use in optical and X-ray transmission studies. Explore kinematic mounts and stacking procedures for grid assemblies, including details on slit pitch, width, thickness, and material. Discover the results of X-ray grid characterization with radioactive sources. Exercise your knowledge with resolution calculations and twist effects on grid modulation. Bonus challenges include source location determination and image back-projection analysis.

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Fabrication and Characterization of Grids for Optical X-Ray Facility

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  1. Grid FabricationandCharacterization Brian Dennis, GSFC Gordon Hurford, UCB

  2. Mounts for Grids 1 - 4

  3. Grid #4 Kinematic Mounts

  4. Coarse Grids #5 - 9

  5. Stacking Coarser Grids

  6. Optical CharacterizationFacility

  7. Grid #2Pitch 59 mmSlit width 41 mmThickness 2.04 mmMaterial Tungsten

  8. OGCFResults

  9. X-RayGridCharacterizationFacility Radioactive Sources Used

  10. Grid #4 X-ray Angular Response

  11. Grid #4 transmission as a function of angle to normal & energy. • + Cd109 • Co57 • X Cs137

  12. Definition of model fit parameters used to characterize the angular dependence of the grid transmission.

  13. Slit/Pitch Ratio & Modulation Efficiency

  14. Exercise 1 • Consider RHESSI grid 1: • 34 micron pitch • 25 micron apertures • 1 mm thick • separated by 1.55m • Grids 9 cm in diameter • Detector 6 cm in diameter • What is the FWHM resolution of RMC1 (assume 1st harmonic only) ? • How much relative twist is required to totally destroy the modulation? • What would be the qualitative and quantitative effect of a relative twist of ½ of this amount ?

  15. Exercise 2 Spin axis at [246,-73 ] Grid 8 slits were pointed at solar north at 18:58:08.5 UT and rotating at 15 rpm (clockwise looking at rear of collimator) What is the source location? Bonus questions: What is effect of a 1 arcminute error in the pointing? a 1 arcminute error in the aspect solution? a 1 acminute error in the roll aspect? Do a back projection image grid 8, 28-aug-2002 185750-185850 and compare to your estimate. Alternatively, use his_vis_fwdfit on the visibilities.

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