XRT Performance Update Edward DeLuca

Solar B X-Ray Telescope Science Goals 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Science Goals 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Science Goals 11/20/2018 Solar B X-Ray Telescope

Requirements Flowdown 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Mirror Properties Optimized Polynomial Design Constraints: Focal Length, Pixel Size, FOV, Resolution Goal: 2” resolution for the full sun FOV Low Scattering Surface roughness < 5A RMS Temperature sensitivity < 1MK (cool coronal plasma 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Mirror Status Mirror polishing is proceeding at Goodrich. We expect the mirror to meet or exceed all requirements. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Entrance Filter Requirements White Light Transmission < 10 -6 Heat Rejection 5 year on orbit survival X-Ray transmission > 0.7 from 1-60A Properties 1600 A Al 2500 A Polyimide 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Focal Plane Filters Requirements White Light Transmission < 10 -6 5 year on orbit survival Temperature Diagnostics from 1 to > 20 MK Morphology for T < 1MK Properties Science filters are on polyimide or free standing Simple proven design Testing/Verification Environmental Transmission 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Filter Status Environmental tests have been performed and flight filters have been chosen. The flight focal plane filters have been received from LUXEL. Initial light leak tests have been done on all the flight fp filters. The flight fp filters are at the XACT Facility in Palermo Italy for calibration tests. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Ordered Filter Set 11/20/2018 Solar B X-Ray Telescope

Optical Paths Overview 2700 mm X-RAY White Light Things to Note: Only one optical path is used at a time. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Mirror Calibration SAO - Centroid Detector Assembly (CDA) Focus Determination Visible light optical axis relative to X-Ray XRCF Encircled Energy On-Axis Encircled Energy Off-Axis Effective Area PSF and Effective Area Off-Axis 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Mirror Calibration XRCF Available Lines C-K 0.277 keV 44.7A O-K 0.525 keV 23.6A Cu-L 0.933 keV 13.3A Al-K 1.49 keV 8.3A Ag-L 2.98 keV 4.2A Ti-K 4.51 keV 2.7A Cr-K 5.41 keV 2.3A Fe 6.4 keV 1.9A Not all lines will be used for all measurements. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Mirror Requirements Focal Length 2708 +/- 5mm Bandwidth 0.2 to 6.0 keV Image Performance 68% encircled energy within 27 microns @ 0.523 keV at focal plane FOV 35 arcmin Effective Area >3.0 cm2 @ 0.56 keV & 1 keV Wings of On-Axis PSF - @6 keV signal at 1 arcmin < 3x10-5 peak flux. 11/20/2018 Solar B X-Ray Telescope

Visible Light Optic Requirements Focal Length 2708 +/- 2mm Central Wavelength 4305 +/- 20 A Bandpass <120A FWHM Resolution <2” half power dia. FOV >30 arcmin Co-Alignment <0.5 arcmin Confocality w/ GI optic +/- 150 microns 11/20/2018 Solar B X-Ray Telescope

Filter Calibration Plan Shadowgraphs Filters are scanned with a mosaic of exposures at a single energy to measure thickness and uniformity References Barbera, M. et al 1996 DOC # OAPA-R5-1996, Sept. 23 1996. Collura, A. et al. 1996 SPIE 2808, 134. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Shadowgraphs 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Thin Be Shadowgraph 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Medium Be Shadowgraph 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Thick Be Shadowgraph 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Energy Scans Energy scans will measure the transmission vs. energy. These measurements are taken at one or two points on the filter. If time permits opacity at 304A will be measured (1e-6 lower limit). 11/20/2018 Solar B X-Ray Telescope

Energy Scans AXAF Example Collura, A. et al 1996 SPIE 2808, 134. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Conclusions XRT will provide high resolution broadband imaging of the corona for the Solar B mission. The goal of understanding the relationship between photospheric driving and coronal dynamics requires a telescope that can image the response at a wide range of temperatures. The high throughput of XRT will allow us to follow the coronal evolution with great accuracy. 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope Filter Transmission 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope 11/20/2018 Solar B X-Ray Telescope

Solar B X-Ray Telescope XRT Exposure Times 11/20/2018 Solar B X-Ray Telescope