Dl ifu prieto taylor
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DL – IFU (Prieto/Taylor). Slicer: 25mas sampling … 0.9mm slices ~f/250 (assuming no anamorphism) Detector = 2k array of 18um pixels Slit subtends 1-pixel (spectral dithering as for TiPi) Camera f-ratio = f/5 (double TMA a la JWST system) Full window requires ~800 pixels

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DL – IFU (Prieto/Taylor)

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Dl ifu prieto taylor

DL – IFU(Prieto/Taylor)

  • Slicer:

    • 25mas sampling … 0.9mm slices

      • ~f/250 (assuming no anamorphism)

  • Detector = 2k array of 18um pixels

    • Slit subtends 1-pixel (spectral dithering as for TiPi)

      • Camera f-ratio = f/5 (double TMA a la JWST system)

      • Full window requires ~800 pixels

        • 4 slits per spectrograph/detector

        • Slit height = ~1000 pixels or 30-by-30 slicer with FoV ~0.752 arcsec.

        • 4 slits gives FoV ~1.52 arcsec.

  • Is this a sufficient field ? Or do we need 2 or 4 units ?

    • NB: SRD asks for ~42 arcsec

    • If only we could use a 42k, 9m pixel, array at f/2.5 !

  • Assume fore-optics can switch in factor of 5 magnification to give:

    • 25mas ; 20mas; 15mas; 10mas; 5mas

    • 5mas option would feed spectrograph at f/12.5

    • What beam-size would be required ? 50mm OK ?


Optical components

Optical Components

  • Cool box:

    • 45 deg. fold to vertical

    • Pupil imager onto ~25mm DM

      • Field lens or Field mirror ? (not exactly at focus)

    • DM as steering mirror

      • feeding mirror at field stop (as in TiPi)

      • but also an imaging system (as in TiPi) to give ~10 arcsec D-L field

      • DM can switch from IFU to direct imaging field by small tip/tilt

        • Object can be viewed directly and then selected into IFU field

        • Surrounding objects can be imaged directly while doing IFU spectroscopy


Optical components1

Optical Components

  • Cryo box:

    • Magnification optics and scale changer optics

      • Non-anamorphic (25mas ; 12.5mas ; 5mas)

      • Cold stop (rotating ?)

    • 2 contiguous 60-slice slicer units

      • square FoV

      • 2 slits into 1 spectrograph

    • Double TMA spectrograph (a la JWST/NIRSPEC)

      • Collimator somewhere between f/10 and f/20 (tbd)

      • Camera f/5

      • Beam size ~50mm (plus pupil diffraction)


Scope of work

Scope of Work

  • Optical concept at same level as TiPi

    • Field lens/mirror

    • DM – steering & image/IFU selector

    • Imaging system (FoV ~10” D-L)

    • Fore-optics / scale changer

    • Slicer unit

    • Spectrograph

      • Approx. wave-front error budget ?

  • Challenges:

    • Larger FoV ~3 arcsec2 ?

    • Faster cameras ~f/2.5 ?


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