Telescope Baseline Configuration Imaging Capability Micropore Optic Telescope
Telescope Baseline Configuration: • Imaging Capability (Micropore Optic) • Telescope Field of View ~ 30° x 30° • Angular Resolution ~ 1. 5 arcminutes • Detector Pixel Size < 200 μm • Detector Energy Range ~ 0. 2 to 2. 0 ke. V • Detector Resolution ~ 50 e. V FWHM @ 600 e. V • Detector Geometric Area ~ 13 cm x 13 cm • Total Instrument Mass ~ 20 – 40 kg • Instrument Power ~ 20 W operational, 2 W standby LXO/Mag. EX Meeting Greenbelt, 24/10/07
Micropore Optics, Leicester Heritage: Optics manufactured to our specification by Photonis (France) Mercury Imaging X-ray Spectrometer (MIXS) (Bepi. Colombo, ESA) PI George Fraser (SRC, Leicester) Status: funded, launch 2013 Wide-Field Auroral Imager (WFAI) (Kua. Fu, Chinese) PI Mark Lester (RSPP, Leicester) Status: proposed, launch ~ 2012 Lobster-Eye Wide-Field Telescope (LWFT) (Spectrum-RG, Russian) PI George Fraser (SRC, Leicester) Status: proposed, launch ? ? LXO/Mag. EX Meeting Greenbelt, 24/10/07
MIXS-T relatively narrow fov ~ few (TBD) degrees LXO/Mag. EX Meeting Greenbelt, 24/10/07
LWFT Prototype Support Structure (left) LXO/Mag. EX Meeting Greenbelt, 24/10/07
LWFT Optic Characteristics • Focal length = 37. 5 cm • Radius of curvature = 75 cm • Channel cross-section = 20 µm • Channel array pitch = 24 µm • Channel length (MCP thickness) = 1 mm • MCP size (one plate) = 4 cm x 4 cm • Channel coating ~ 200 Å Ni • Support Structure Material = Beryllium Alloy • Optic Mass ~ < 1 kg LXO/Mag. EX Meeting Greenbelt, 24/10/07
Detector Plane Detector plane geometric area is half the optic geometric area LXO/Mag. EX Meeting Greenbelt, 24/10/07
Optic and Detector Geometrical Area for FOV & Focal Length Optic RC 50. 0 FL 25. 0 20° 30° 40° 17. 5 26. 2 34. 9 75. 0 37. 5 26. 2 39. 3 52. 4 100. 0 50. 0 34. 9 52. 4 69. 8 Optic (cm) Area 50. 0 25. 0 8. 7 13. 1 17. 5 75. 0 37. 5 13. 1 19. 6 26. 2 100. 0 50. 0 17. 5 26. 2 34. 9 LXO/Mag. EX Meeting Greenbelt, 24/10/07 ~ 170 cm 2 Detector ~ 380 cm 2 (cm)
EPIC-MOS detector plane: 7 x 2. 5 cm CCDs; Total Geometric Area ~ 44 cm 2 Devices, FI MOS CCDs, manufactured by E 2 V (was EEV) LXO/Mag. EX Meeting Greenbelt, 24/10/07
Large Area focal plane detectors now common in Optical applications Gaia (ESA) Cost ~ 50 -100 K Euro/Unit focal plane array (E 2 V devices) LXO/Mag. EX Meeting Greenbelt, 24/10/07
Large Area Detector (LAD) Program for X-ray Applications Research joint funded by UK industry (E 2 V) and PPARC Application in this case was X-ray macromolecular crystallography 5. 5 cm x 4. 1 cm active area, 3. 2 M pixel, 27 µm, 2 MHz pixel readout, Device is 3 -sides buttable LXO/Mag. EX Meeting Greenbelt, 24/10/07
Hamamatsu CCD…. BI device, 6. 69 cm x 3. 15 cm, 4 -sides buttable Designed for proposed Hyper. Suprime Camera on Subaru Focal plane array has 176 CCDs Readout is 130 k pixel s-1 readout, so to read out full frame of 2 k x 4 k pixels would take ~ 64 s ! On-board binning to 150 µm pixels (~ 2 arc minute on sky) allows Minimum readout time of 0. 64 s (not counting overhead, ~ factor of 2) Max source count rate ~ 0. 8 cts / kilosecond /pixel LXO/Mag. EX Meeting Greenbelt, 24/10/07
CCD arrangement on Focal Plane ? PSF Optimum Centre FOV PSF Optimum Outer FOV PSF Optimum Across FOV LXO/Mag. EX Meeting Greenbelt, 24/10/07
Bottom-line Detector Issues…to be solved Technical Issue: Power How many CCDs can we operate within the power budget? Project Issue (assuming technical solution): Development Cost Can we use “off-the-shelf CCDs? ” LXO/Mag. EX Meeting Greenbelt, 24/10/07
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