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EddiCam: The Eddington Photometric Camera

EddiCam: The Eddington Photometric Camera. Preliminary Design Layout. Eddicam. Eddicam. CCD baseline characteristics Format: 740 x 2900 pixels Pixel size: 27 x 27 µm 2 Chip size: 20 x 80 mm 2 Full well capacity: 1.6 Me - Minimum line readout time: 13 µs

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EddiCam: The Eddington Photometric Camera

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  1. EddiCam: The Eddington Photometric Camera Preliminary Design Layout . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  2. Eddicam . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  3. Eddicam • CCD baseline characteristics • Format: 740 x 2900 pixels • Pixel size: 27 x 27 µm2 • Chip size: 20 x 80 mm2 • Full well capacity: 1.6 Me- • Minimum line readout time: 13 µs • Frame transfer time: 20 ms • Readout noise: 10 - 15 e- at 0.5 MHz • Operational temperature: -80 / -100 C . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  4. Eddicam Frame transfer covers Filters Planet finding CCD layout Asteroseismology layout . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  5. Eddicam • CCD array preliminary design • 16 + 4 CCDs covering the full FOV • CCDs working in frame transfer mode for asteroseismology (short integrations on bright stars) • CCDs working in full frame mode for planet finding(long integrations on weaker stars) . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  6. Eddicam • CCD mosaic proposed by Marconi: • 20 CCDs on individual INVAR packages • Each CCD individually mounted on a large INVAR baseplate • All CCDs within ±10 µm from the baseplate: no individual focussing required • Flatness variation < 3 µm from +20 to -100 C • Butting gap around 500 µm . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  7. Eddicam Prototype of CCD array proposed by Marconi . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  8. Eddicam Detail of individual CCD chip package . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  9. Eddicam • EddiCam Camera Unit Preliminary Layout • CCD Support Assembly • CCD Mask Assembly • Calibration Assembly • FEE Box • Support Structure . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  10. Eddicam Eddicam Preliminary Layout . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  11. Eddicam Calibration Assy CCD Mask Assy CCD Support Assy Support Structure Assy FEE Box Eddicam Explode View . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  12. Eddicam • CCD Support Assembly Primary Missions: • Provide an accurate and stable support to the CCD Mosaic • Provide an effective thermal path between CCD´s and the heat sink I/F • Provide a cold trap for decontamination purpose Top Face View Bottom Face View . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  13. Eddicam Cold Trap Invar Plate CCD Mosaic Flexible Thermal Links Cold Ring CCD Support Assy Explode view . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  14. Eddicam • CCD Support Assembly Hot Points: • Required flatness of the mosaic plane • Required alignment between CCD´s • Maximum butting gap (design based on three side buttable CCD) • Thermal stability control ( 0.1K/h): • -Completely passive (by mean of thermal equilibrium and thermal inertia) • -Thermally controlled by mean of sensors/heaters • Flexible thermal links: • Copper/Aluminium straps • Carbon Fibre straps(?) • Micro heat pipes • Thermal Switches for the baking mode(?): • CCD Mosaic cooling path disconnection could be required . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  15. Eddicam • CCD Mask Assy Missions: • Change between planet finding and asteroseismology operational modes • CCD Mask Assy Hot Points: • Single or Multiple actuation: • driver for actuator concept • Mask-CCD´s gap: • potential straylight source • baking mode • If lubrication required: • cleanliness control problem . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  16. Eddicam CCD Mask Assy Mechanical Concepts: Slidding Concept Cam/Rotating Concept . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  17. Eddicam • Calibration Assy Missions: • Provide dust protection during the AIV and Launch Phases • Provide a flat field light on the CCD plane for calibration • Calibration Assy Hot Points: • Single or Multiple actuation: • Driver for actuator concept • If lubrication required: • Cleanliness control • Straylight • If spectral information required: • Devices included in this assy • High Impact on preliminary configuration concept . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  18. Eddicam • FEE Box: • Provide mechanical support to each preamps boards • Provide a dedicate thermal control system for heat dissipation • Provide protection against radiation • FEE Box Hot Points: • Mass and Envelope • Accessibility and integration with CCD´s • Thermal conductivity between electrical connections • Thermal isolation from CCD´s Support • and cooling design . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

  19. Eddicam • Support Structure Assy Missions: • Provide a stiff and stable connection to the telescope • Provide support to the different elements of the camera unit • Provide support to the electrical and thermal devices from the telescope • Provide allocation to the refocusing system(?) • Support Structure Assy Hot Points: • High stable structure • Heat pipes and harness path from telescope to the unit • Focusing system: high impact on preliminary design . Vienna, September 17th, 2001 T.Muñoz/C.Laviada (INTA)

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