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SVOM MXT Breadboard Testing Dick Willingale SVOM MXT Lobster Eye Telescope Breadboard Model Testing Preliminary Results Dick Willingale Adrian Martindale,

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Presentation on theme: "SVOM MXT Breadboard Testing Dick Willingale SVOM MXT Lobster Eye Telescope Breadboard Model Testing Preliminary Results Dick Willingale Adrian Martindale,"— Presentation transcript:

1 SVOM MXT Breadboard Testing Dick Willingale SVOM MXT Lobster Eye Telescope Breadboard Model Testing Preliminary Results Dick Willingale Adrian Martindale, Jim Pearson, Charly Feldman, Julian Osborne University of Leicester

2 SVOM MXT Breadboard Testing Dick Willingale SVOM MXT Breadboard F=1000 mm Aperture 210x210 mm 2 2 Total mass of integrated optic ~1 kg (~250 kg/m 2 )

3 SVOM MXT Breadboard Testing Dick Willingale Narrow Field Lobster Eye Optimization 3 Maximize area at 1 keV For wide field L/d≈50 constant For narrow field - maximum area on axis - L≈2.5dF/R F=1150 mm d=40 μm 21 square pore MCPs - each plate has aperture 38 x 38 mm 2 L 1.22 – 2.74 mm L/d

4 SVOM MXT Breadboard Testing Dick Willingale Breadboard Model X-ray Testing 4 Al support frame – spherical surface R=2000 mm Machining accuracy ±10 μm 2x 20 μm plates, 2x 40 μm plates, 1x Ir coated plate Testing 1 plate Leicester TTF Source at 27 m F=1000 mm

5 SVOM MXT Breadboard Testing Dick Willingale Measured Imaging 1.5 keV 5 Single plate – off-axis Set at nominal focal length allowing for finite source distance Focused spot FWHM=6.0 arc mins 2 adjacent reflections - focus 1 reflection - cross arm 0 reflection - straight through Note: MXT detector 19.3x19.3 mm

6 SVOM MXT Breadboard Testing Dick Willingale Measured Imaging 1.5 keV 6 Single plate – off-axis in vertical direction Set at nominal focal length allowing for finite source distance Length of cross-arm is the width of plate 38 mm, 2.18 degrees 2 adjacent reflections - focus 1 reflection - cross arm Edge of plate truncates cross arm

7 SVOM MXT Breadboard Testing Dick Willingale Results Single plate performance at nominal focus –FWHM 6.0 arc mins (c.f. 8.5x7.5 arc mins for MIXS-T) –Lobster eye performance better than Wolter I configuration but not as good as expected (4.5 arc mins) – possible explanation: The finite source distance of 27 m not corrected for Not at true focus Combination of slumping, shear and surface roughness worse than expected The measured efficiency ~70% of theoretical for the Ir coated plate –From the MIXS-T results (which used Ir coating) we expect 85% theoretical The results are highly dependent on correct modeling of the test set up – the analysis is on-going The available data are not consistent – maybe because of spectral contamination in the X-ray beam or maybe incorrect modeling – more analysis required We hope to take more data early April


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