Grid Fabrication and Characterization Brian Dennis, GSFC Gordon Hurford, UCB.

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Presentation transcript:

Grid Fabrication and Characterization Brian Dennis, GSFC Gordon Hurford, UCB

Mounts for Grids 1 - 4

Grid #4 Kinematic Mounts

Coarse Grids #5 - 9

Stacking Coarser Grids

Optical Characterization Facility

Grid #2 Pitch 59 m m Slit width 41 m m Thickness 2.04 mm Material Tungsten

OGCF Results

X-Ray Grid Characterization Facility SourceEnergy (keV) Strength on 5/19/1998 (mCi) Cd Co Cs Radioactive Sources Used

Grid #4 X-ray Angular Response

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

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

Slit/Pitch Ratio & Modulation Efficiency

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 1.What is the FWHM resolution of RMC1 (assume 1 st harmonic only) ? 2.How much relative twist is required to totally destroy the modulation? 3.What would be the qualitative and quantitative effect of a relative twist of ½ of this amount ?

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 and compare to your estimate. Alternatively, use his_vis_fwdfit on the visibilities. Exercise 2