Wafer-Scale Imager for Prime (WaSP) Technical Specifications

Status: Observatory Instrument


    Contents

  1. Updates
  2. Documentation
  3. Telescope
  4. Detectors
  5. Filters
  6. Software

1. Updates

WaSP focal plane layout. (Palomar/Caltech)

Initial facility deployment February 2018.

2. Documentation

Coming soon.

3. Telescope

  • 200-inch prime focus, f/3.3.
  • Field of view: 18.4′ x 18.5′.

4. Detectors

  1. "Science Detector": 6144 (H) × 6160 (V) E2V 231C.
    • Pixel Size: 15 µm square
    • Imaging Area: 92.2 x 92.4 mm
    • Plate Scale: 0.18"/pixel
    • Field: 18.4′ × 18.5′
    • Read noise: 5 e.
    • Full Well: 350Ke
    • Dark current: 3.0 e/pixel/hr
    • Frame rate (shortest exposure time for full array): 3.23 seconds.
  2. Guide and Focus CCDs: 2064x2064 STA3600A delta-doped
    • Pixel Size: 15 µm square
    • Imaging Area: 31.0 × 31.0 mm
    • Plate Scale: 0.18"/pixel
    • Field: 6.192′ × 3.096′ (frame-transfer read)
    • Read noise: 2 e.
    • Full Well: 200 Ke
    • Dark current: 2.0 e/pixel/hr
  3. Readout Time:
    • Full-Frame Science Array: 12s
    • Full-Frame Guide Array: 7.5s
    • Full-Frame Focus Array: 15s

5. Filters (Standard Setup)

Currently WaSP shares filters, and the filter and shutter assembly with LFC. Filter wheel has slots for 4 filters.

Filter Central λ
(Å)
Width
(Å)
Thickness
(mm)
Focus offset
(mm from r')
Domeflats [a] Dark sky [a]
(raw chip 0)
Transmission
r' 6255 1470 3.05 5 1400 data, plot
i' 7680 1540 3.05 3 650 data, plot
z' ~9000 ~1800 (w/qe) 3.05 5 750 data, plot
g' 4660 1400 8.02 +1.5 40   data, plot
u' 3540 590 8.38 +1.6 120 (highlamp)   data, plot
Rs 6930 1220 10.26 +2.0 8   data, plot
Is 8190 1670 10.26 +2.0 5   data, plot
B-bess 4400 1000 7.0 +1.3 2 (highlamp)   data, plot
V-bess 5500 900 7.0 +1.3 40   data, plot
R-bess 6300 1200 7.0 +1.3 10   data, plot
I-bess 9000 3000 7.0 +1.3   data, plot
Broad-RI 7670 2940 6.0       data, plot
6570 100 11.68 +2.8 120   plot
S-II 6730 90 11.68 +2.8 120   plot
6610/100 6610 100 7.06 +1.3 120   plot
6650/100 6650 100 7.06 +1.3 120   plot
6700/100 6700 100 6.93 +1.3 120   plot
5200/70 5200 70 4.90 ?     not yet on record
5085/70 5085 70 5.13 ?     not yet on record
[a] Seconds to 10,000 DN (unbinned)

6. Starting the WaSP software

  1. Open the following vnc desktop on the observer computer (vncviewer 198.202.125.140:16 or wasp.palomar.caltech.edu:16).
  2. Right mouse click on the desktop and select open terminal.
  3. Start the WASP instrument control software by typing “wasp”.
  4. Open the “WASP Filter-wheel and Shutter Control”.
  5. “Home” the shutter first.
  6. “Home” the filter-wheel.
  7. Select filter you wish to focus in.
  8. Open the “Electronics Monitoring” tab and engage “Activate Shutter” and “Activate Filter-wheel”.
  9. Select “LFC Shutter” radiobutton.
  10. Return to the main panel and engage the “Display in DS9” button.

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WaSP Specs / v 0.0.1dev
Last updated: 03 April 2018 AFB/JWM/CMH