1. EUCLID NEAR IR SPECTROGRAPH FOCAL PLANE
ENIS FOCAL PLANE
EUCLID NEAR IR SPECTROGRAPH FOCAL PLANE
People:
F. Bortoletto (OAPD)
V. DeCaprio (OAMI)
E. Giro (OAPD)
L. Corcione (OATO)
C. Bonoli (OAPD)
S. Ligori (OATO)
M. D’Alessandro (OAPD)
G. Morgante (IASFBO)
Munich 16/10/09
ENIS Focal Plane

2. ENIS FOCAL PLANE
EUCLID MISSION
Cosmology Medium-class mission in the ESA’s ‘Cosmic Vision’ program
High-precision survey mission: centered on Weak Lensing and BAO
L2 Orbit
4-5 year mission
Passively cooled
Telescope: 1.2 m Korsh
• Instruments:
Visible imaging channel: 0.5 deg2, 0.10 ’’/pixel, 0.23’’ PSF FWHM, broad band R+I+Z ( µ), CCD detectors, galaxy shapes
NIR photometry channel: 0.5 deg2, 0.3 ’’/pixel, 3bands Y,J,H ( µ), HgCdTe detectors, photometric Z
NIR Spectroscopic channel: 0.5 deg2, R= , baseline: slitless ( µ), option: multi-object ( µ) Digital-Micro-Devices (DMD) based, redshifts
Munich 16/10/09
ENIS Focal Plane

3. ENIS FOCAL PLANE
EUCLID MISSION
Euclid will survey the entire extra galactic sky ( deg2) to simultaneously measure its two principal dark energy probes:
Weak lensing:
Diffraction limited galaxy shape measurements in one broad visible band (R+I+Z) up to 24.5 ABmag
Photometric Z measurements in 3 NIR bands (Y,J,H) up to 24 ABmag (H)
Baryonic Acoustic Oscillations:
Spectroscopic Z survey for 33% of all galaxies brighter than 22 ABmag (H)
Munich 16/10/09
ENIS Focal Plane

4. ENIS: Slitless Spectrograph Option
ENIS FOCAL PLANE
ENIS: Slitless Spectrograph Option
Input Tel. Beam
To FP
Telescope beam is collected at an intermediate instrument position, hits the pick-off mirror (in grey), passes through a couple of corrector lenses (blue), then is directed to the collimating parabola by a flat folder. The same folder, after collimation, projects the beam to the removable disperser. Light is then refocused onto the NIR focal plane array by a four lenses f# 6.8 camera.
Munich 16/10/09
ENIS Focal Plane

5. ENIS: DMD Spectrograph Option
ENIS FOCAL PLANE
ENIS: DMD Spectrograph Option
Digital Micromirror Device at the
f# 3 intermediate focal plane
Input Tel. Beam
Munich 16/10/09
ENIS Focal Plane

6. ENIS: Slitless and DMD Focal Planes
ENIS FOCAL PLANE
ENIS: Slitless and DMD Focal Planes
‘DMD’ mode field is split at the pick-off optics
in four independent channels
‘slitless’ mode FPA
Munich 16/10/09
ENIS Focal Plane

7. ENIS FOCAL PLANE Focal planes will be constructed
making use of the forthcoming
generation of 2048x2048 H2RG
detectors with MBE processed MeCdTe
sensitive layer (2.5 µ cut-off) and SiC
mechanical substrate.
Readout electronics is based on the
forthcoming 32 ch. SIDECAR ASIC
mounted in CGA technology.
Munich 16/10/09
ENIS Focal Plane

8. ENIS SLITLESS FOCAL PLANE
ENIS FOCAL PLANE
ENIS SLITLESS FOCAL PLANE
‘slitless’ mode FP mechanics:
H2RG mosaic is mounted and aligned
on a SiC thermally controlled frame
228x148x61 mm
TOT. MASS + 20% Cont. : Gr
Readout ASICs
can higher temperature
Munich 16/10/09
ENIS Focal Plane

9. ENIS DMD FOCAL PLANE ‘DMD’ mode FP mechanics: 1 from 4
ENIS FOCAL PLANE
ENIS DMD FOCAL PLANE
‘DMD’ mode FP mechanics:
1 from 4
same concept as for ‘slitless’ mode.
140x95x70 mm
Readout ASICs directly mounted
in the housing back-cover to save space
TOT. MASS + 20% Cont. : 3800 Gr
Munich 16/10/09
ENIS Focal Plane

10. ENIS FOCAL PLANE Extrapolated solar activity for
the Euclid launch date.
Preliminary Montecarlo simulations have been done considering the average fluence in L2 for Mev Protons.
Present mechanical design is compatible
with shielding requirements.
Munich 16/10/09
ENIS Focal Plane

11. ENIS FOCAL PLANE THERMAL
Temperature requirements derived from background radiometry:
‘slitless’
backgrounds
System:
Nominal Temperature :
Long Term Stability :
H2RG Detector
80 Kº
< 10 m Kº (500 Sec)
H2RG Housing
75 Kº
< 2 Kº (annual)
SIDECARs
75 or 150 Kº
< 2 Kº “
SPW Adapters
150 Kº
Spectrograph
Optical Bench
Telescope M1
< 200 Kº
TBD
‘DMD’
backgrounds
Munich 16/10/09
ENIS Focal Plane

12. ENIS FOCAL PLANE THERMAL
150 K
80 K
77 K
75 K
80 K
Munich 16/10/09
ENIS Focal Plane

13. ENIS FOCAL PLANE READOUT
Achievement of RON requirements and
CRs deglitching possibility require a readout
strategy based on multiple-readouts:
Groups:
NDROs:
RON e- RMS :
Buffer
Gbytes: 15 2
6.2
Sampling in continuous non-destructive readout (NDRO) mode illustrated for a single H2RG cell and results for a 15 e- single
CDS device.
Groups:
NDROs:
RON e- RMS :
Buffer
Gbytes: 20 2
5.5
2.7
Munich 16/10/09
ENIS Focal Plane

14. ENIS FOCAL PLANE READOUT
Expected CR rates are 5÷30 events/Sec/Cm2 I.E. 4÷25% of FP pixels
@ 500 Sec exposure and with 5 pixels/CR
Simulation with 5÷30 events/Sec/Cm2
About 15÷20 UTR Groups needed to correct
Munich 16/10/09
ENIS Focal Plane

15. ENIS FOCAL PLANE CONTROL
MODE : A B C
1x FP = 67.1 Mbytes
CR removed on the live data stream:
CR removed after UTRs stored on dual buffered memory:
CR detected after UTRs stored on dual buffered memory. Affected pixels UTRs + good pixels downloaded:
TOTAL frames needed: 10
(FP fit parameters)
15*2+2
(FP images)
TOTAL Work/Buffer Memory Needed:
671 Mbytes
2.1x2 Gbytes
(dual buffered)
Processing Speed:
25.4 Mflop/Sec
14.5/16.6 Mflop/Sec
14 Mflop/Sec
TOTAL Bytes to download:
67.1 Mbytes
114 5% CR % CR
TOTAL per Day Telemetry :
93 Gbaud
158 5% CR
418 25% CR
Munich 16/10/09
ENIS Focal Plane

16. ENIS FOCAL PLANE CONTROL
Space Wire (SPW) communication architecture makes the FP electronics
exactly compatible between the two configurations: slitless and DMD:
150 ºK ºK ºK ºK ºK
ENIS FP REQUIRED POWER + 20% CONTINGENCY: 5100 mW
Munich 16/10/09
ENIS Focal Plane

17. ENIS FOCAL PLANE CONTROL
Two redundant processing systems:
DAPU, data processing (averaging, deglitching)
ICU, Controls & Data Handling (compression)
Munich 16/10/09
ENIS Focal Plane

18. ENIS FOCAL PLANE CONCLUSIONS
ENIS yellowbook already presented
IDD document presented (end of September)
EUCLID ESA scientific presentation in november
Preselection results beginning next year
Munich 16/10/09
ENIS Focal Plane