1. WEAVE Spectrograph

2. Optical Design Optical Hardware Opto-Mechanics Detectors Control
Management
Johan Pragt, NOVA, the Netherlands , ALH meeting

3. 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, –545, –685

4. 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

5. 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

6. 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

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

8. 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

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

10. 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

11. 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)

12. 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

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

14. WEAVE Spectrograph
Johan Pragt, NOVA, the Netherlands , ALH meeting