Latest Instrumental Developments

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Latest InstrumentalDevelopments
THEMIS

• Presentation
• to the
•  THEMIS User Meeting 
• THEMIS S.L.
• C. Le Men Meudon, 15th november
  2006

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THEMIS LatestInstrumental Developments

• TIP TILT

• NEW MTR Cameras

• Further Developments

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TIP TILTOptics Mechanics

• 4 arcmin Field
• Totaly Achromatic
• Scientific Beam gt 98 450-1100 nm
  ?85 400-450 nm
• WFS Beam 15 400-450 nm
• Tip-Tilt Platform Closed Loop in lt 1ms
  _at_ 0.01arcsec Resonance gt
  2000 Hz

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TIP TILTControl Synoptic
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TIP TILTControl (UCTT)
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TIP TILTThe New Fast Camera

• QE _at_430 nm 18 gt 4 times more ADU
• CMOS 1280x1000 ! gt Selectable ROI
• Frame Rate _at_72x72 gt 0,5ms (2000 fps)
• Frame Rate _at_64x64 gt 0,36ms (2800 fps)
• Fireware (IEEE1394) gt No Ram writting time

• 0,145 arcsec/pixel _at_ 430 nm 72x72 Acquired
  Matrix (0.5ms Readout)
• 64x64 sub-Reference Matrix (9,2 x 9,2 arcsec)
  within 15arcsec F1-Slit
• 48x48 sub-Measurement Matrix (7 x 7 arcsec)
• 0.7 ms Exposure Time

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TIP TILTImage Quick View (UVUM)
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TIP TILTControl Loop (AETT)
FOpen 416 Hz
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TIP TILTPerformances
FOpenLoop 416Hz
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TIP TILTCharacterization...
Power Spectra of Image Motion gt Attenuation

• ? 600nm
• Wind V 15 m/s
• D 90 cm
• Ro 10 cm gt
• Res. 1,5 arcsec
• Ft 4 Hz ( 0.24V/D )

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TIP TILTCharacterizationSeeing
Characterization CMOS 0,035arcsec/pixel 128x32
(543 FPS)
NO MECHANICAL RESONANCY !
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TIP TILT CharacterizationStabilization on SPOT
Characterization CMOS 0,035arcsec/pixel 0,5ms
exposure time 200x200 pixels (400 FPS) gt Spectra
Up to 200 Hz
Residual Motion 0,020 arcsec _at_ 2,5ms Cadency
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TIP TILT CharacterizationSpectrum on SPOT
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TIP TILT Characterization Attenuation on SPOT
F-3dB 65 Hz
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TIP TILT CharacterizationStabilization on
GRANULATION
Residual Motion 0,036 arcsec _at_ 2,5ms Cadency
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TIP TILT CharacterizationSpectrum on GRANULATION
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TIP TILT Characterization Attenuation on
GRANULATION
F-3dB 65 Hz
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TIP TILTConclusion
The TIP TILT Works FINE ! BUT
On Granulation there is a LONG TERM STABILITY
PB gt This HAS to BE IMPROVED if we WANT every
SCANS to be GOOD CORRELATED

• Increasing the FIELD Scan from 7
  arcsec IN 9 arcsec TO 7 arcsec IN 10.5
  arcsec
• Applying Best Fitting Method on the Correlation
  Function
• Improve the Image Quality (AO)

Possible IMPROVEMENTS
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TIP TILTConclusion Image Quality ?
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TIP TILTConclusion Image Quality ?

• ! Need Adaptive Optics !

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New MTR CamerasThe Choice
ANDOR iXon DU-897 EMCCD !

• 512x512 pixels (16?m square)
• 35ms Readout (28.5 FPS in RAM !)
• Read Noise lt 25 e-
• Well Depth 200000 e-
• True 14 bit (16384 adu)
• On Chip Amplification 1 to 1000
• Cooling Up to -80ºC ( dark lt 0.005e-/px/s)
• Back Illuminated CCD ( QE _at_500nmgt90 )
• Exposure from lt1ms to few minutes

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New MTR CamerasWHY ?
DUTY CYCLE ! (4 cameras example)
0.90 FPS
Duty Cycle 27
1.54 FPS
Duty Cycle 46
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New MTR CamerasWHY ?
QUANTUM EFFICIENCY !
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New MTR CamerasWHY ?
SPATIAL RESOLUTION !
GRID MODE

• 2 barrels (66 arcsec) _at_ 0.14 arcsec/px
• 3 barrels (100 arcsec) _at_ 0.20 arcsec/px
• 4 barrels (132 arcsec) _at_ 0.28 arcsec/px
• ...
• 7 barrels (240 arcsec) _at_ 0.47 arcsec/px

SLIT MODE

• 2 x 1 mode (60 arcsec) _at_ 0.25 arcsec/px
• 2 x 2 mode (120 arcsec) _at_ 0.49 arcsec/px

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New MTR CamerasAcquisition Synoptic
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New MTR CamerasOpto-Mechanical Synoptic
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New MTR CamerasOpto-Mechanics Designs
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New MTR CamerasConclusionThe Project STATUS

• Info-Industrial Design
• Opto-Mechanicals Design
• Mechanics Fabrication
• Optics Fabrication
• 3 Cameras Works in //
• 3 Cameras LEFT
• Telescope Integration
• Characterization

• Done (November 06)

• Done (November 06)

• TB Done (February 07)

• TB Done (January 07)

• TB Done (December 06)

• TB Done (December 06)

• TB Done (January 07)

• TB Done (Feb/March 07)

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Further Developments

• Image Quality

• Adaptive Optic
• Post Reconstruction

• Polari -metry

• New Polarization Analyzer (LC),
• Polarimetric Imagery (IPMPolar)