Eddi Cam The Eddington Photometric Camera Preliminary design

Eddi. Cam: The Eddington Photometric Camera Preliminary design 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 1

Eddicam • Eddi. Cam design drivers – Integration times: 0. 5 to 30 s – Number of stars to be monitored simultaneously: up to few times 105 – White light (TBC!!) – Duty cycle: > 90% – High photometric accuracy. Noise induced by random perturbations (readout noise, jitter, thermoelastic stability, CCD thermal stability, . . ): < photon noise. 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 2

Eddicam • Preliminary baseline design – Ø 3° field of view (1. 5° x 3° effective FOV in asteroseismology mode) – 20 CCD mosaic – broad band (4000 -9000 Å) coverage (white light) 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 3

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 4

Eddicam Eddi. Cam location 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 5

Eddicam • Eddi. Cam components – Focal Plane Assembly: • • • 1 st Eddington Workshop CCDs array FEE Frame store buffer covers Calibration LEDs Shutter/cover Thermal control subsystem . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 6

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 – Frame transfer time: 20 ms – Readout noise: 10 - 15 e- at 0. 5 MHz – Operational temperature: -80 / -100 C 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 7

Eddicam CCD read out noise as a function of readout frequency 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 8

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) 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 9

Eddicam Filters Planet finding CCD layout 1 st Eddington Workshop . Frame transfer covers Asteroseismology layout Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 10

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 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 11

Eddicam Prototype of CCD array proposed by Marconi 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 12

Eddicam Detail of individual CCD chip package 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 13

Eddicam Detail of XMM-EPIC 7 CCD mosaic 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 14

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 15

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 16

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 17

Eddicam Wheel with 3 positions: • closed • open • dispersive element Proably feasible, but expensive. . . 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 18

Eddicam – CCD Control Unit • Integration time control • Full frame/transfer frame operation • CCDs windowing • CCDs binning • Selection of readout ports and speeds • Generation of CCDs clocks, bias and power supply – Read Out Electronics • CCD readout • Digitization • Data transmission to Data Processing Unit Simultaneously for 20 CCDs with 40 Mpixels 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 19

Eddicam – Data Processing Electronics • Telecommand management of Eddi. Cam • Scientific onboard data processing (heavy!!) • Generation of TM and communications with OBDH – Power conditioning electronics • Conditioned power supply to CCU, FEE and ROE (very stable and low noise!) • Power supply for shutter, LEDs and covers 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 20

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 21

Eddicam • Preliminar budgets 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 22

Eddicam • The Eddi. Cam Definition Working Group Centro de Astrobiología — Instituto Nacional de Técnica Aeroespacial Centre Spatial de Liège + Universite de Liège Deutsches Zentrum für Luft und Raumfahrt (DLR-Berlin) Institute of Space Sensor Technology and Planetary Exploration Instituto de Astrofísica de Andalucía + Instituto de Astrofísica de Canarias Leicester University + Mullard Space Sciences Laboratory (London) Observatoire de Paris + DAPNIA / CEA (Saclay) Universität Wien 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 23

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 24

Eddicam • Eddi. Cam Definition Phase milestones – Mid July 2001: Official answer from ESA to the Lo. I. – September 2001: Telescope studies kick-off ==> interaction between Telescope and Eddi. Cam – Summer - fall 2002: end of telescope, CCDs and mission studies. – End of 2002: Eddi. Cam preliminary design and system specifications – Spring 2003: preliminary requirements review (PRR) ==> start of Phase B 1 st Eddington Workshop . launch in 2007/08!! Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 25

Eddicam 1 st Eddington Workshop . Córdoba, June 14 th, 2001 J. Miguel Mas-Hesse 26