WEAVE Spectrograph.

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Presentation transcript:

WEAVE Spectrograph

Optical Design Optical Hardware Opto-Mechanics Detectors Control Management Johan Pragt, NOVA, the Netherlands 2016-12-19, ALH meeting

Characteristics 4 Entrance Slits 960 MOS fibres (plate A) 940 MOS fibres (plate B) 740 mini IFU’s (plate B) 589 Large IFU MOS Fiber size 1.3″ Number of small IFUs, size 20 x 11″x12″ (1.3″ spaxels) LIFU size 1.3′x1.5′ (2.6″ spaxels) Low-resolution mode 5750 (3000–7500) Low-resolution mode wavelength coverage (nm) 366–959 High-resolution mode 21000 (13000–25000) High-resolution mode wavelength coverage (nm) 404–465, 473–545, 595–685

Layout, topview BLUE RED Coll.Mirror Slit Dichroic Camera High Res. Corr. lenses Corr. lenses Shutter Camera Camera Shutter Low Res. Low Res. Detector, Cryostat Detector, Cryostat VPH Gratings VPH Gratings Control

3D design Control Control Coll.Mirror Slit mech. Dichroic Control Camera Detector Corr. lenses Corr. lenses Camera VPH Gratings VPH Gratings Detector Control Transport and mounting frame

Nasmyth Platform GHRIL laboratory at WHT Temperature controlled room Modified internal door Modified to clean area Nasmyth Port SpectroControl Fibre routing Spectrograph in Dust cover LN2 filling

Slit Exchange Mechanism 4 slits Pneumatic actuators Iso static mounting Back illumination

Collimator Unit Hart of the instrument Collimator mirror 670 mm dia Dichroic 385 x 305 mm Dichroic Active Slit Collimator mirror Dichroic Back illumination positions (4) Corrector Lenses Red Corrector Lenses Blue VPHG align red VPHG align blue

Corrector Lens align test (aluminium) Dichroic plate, flat within 0.3 micron (300 nm, 1 wave)

VPH Grating 2x Low Resolution Gratings (1x Blue, 1x Red), 235 x 235 mm 3x High Resolution Gratings (2x Blue, 1x Red), 230 x 380 mm

Camera 8 lenses 3 lens barrels Smallest lens 195 mm (L8) Largest lens 320 mm (L3 and L4) 3 lens barrels Floating pads rotate Camera, lift 10 micron Focus adjust by electrical servo motors (2) LN2 in/out (blue tubing)

Detector 2 detector system (blue and red) each 2x chips of 6kx6k pixels (size chip 90x90 mm) LN2 bath cryostat Detector Control unit with glycol cooling

Control Unit Early available Extensive testing Remote controlled in test phase PLC Control Software Control

WEAVE Spectrograph Johan Pragt, NOVA, the Netherlands 2016-12-19, ALH meeting