Specification and performance summary of OOPS

Characteristics of OOPS

Toshiyuki Sasaki
Developer of OOPS, Subaru/NAOJ
( 1994-10-20 )

• Wavelength coverage:
  
  4000 - 7000 A: defined by a half-wave plate retardance.
  
  cf. lens optics has fairly good image over 4000-8000 A.

• Optics:
  • Collimator lens used:
    AI Nikor 135mm/F2.8S
  • Camera lens:
    AI Nikor 50mm/F1.2S
  • Reducing optics of 1/2.7 achieved.

• Polarization Analyser:
  Rochon Prism + half-wave plate(achromatic)
  
  Rochon Prism:
  Separate angle:7 deg
  Size: 25x25x27.63 cm
  half-wave plate(achromatic):
  Size: φ15mm

• FOV: 6.0' x 4.6'
  FOV on Focal plane: 21mm x 16.2mm
  FOV on CCD : 7.8mm x 6.0mm
  
  corresponding to 634 pixel x 487 pixel

• Detector:TI CCD TC-215

  pixels:	1024 x 1024 ( 12.6 x 12.6 mm )
  pixel size:	12.3μmx12.3μm
  scale on CCD:	0.6"/pixel, 46.4"/mm
  linearity:	0.9876 ± 0.0023
  Conversion factor:	0.810 ± 0.054 e/ADU
  Read-out Noise:	9.9 ± 0.27 e
  Dark current:	4.4 ADU/pixel/hour @ -120 C
  Radiation/Cosmic events:	171.2 events/hour/frame
  CCD controller used:	Messia-II

• Dewar: made by Infrared Laboratories Inc.
  
  CCD housing separeted from Deawr.
  LN2 consuming time: 14 hours @-120C
  

• Aperture wheel: Size of 50mmx50mm and thickness of 6mm x 6 plates
  
  • Aperture mask used: 21mm x 16.2mm
    
  • Slit available:
    width 0.1mm length 16.2mm
    width 0.3mm length 16.2mm
    width 1.0mm length 16.2mm
    

• Filter wheel#1: Size of 50mmx50mm and thickness of 6mm x 6 plates
  
  : exchangeable by Observer

• Grism wheel( Filter wheel #2):
  
  Size of 50mmx50mm and thickness of 13mm x 6 plates
  
  : Permitted people can change Grsims.

• Shutter: below Filter wheel #1 in paralell beam section.
  
  Shutter speed: 0.1sec 〜several days

• Acquisition/Guiding system:
  
  • detector: IICCD（Hamamatsu Photonics Inc.)
  • offset guiding:
    • FOV:1' 43" (RA) x 2' 17"(Dec)
      
    • Limiting magnitude: 16 mag
      
    • guiding area with IICCD：25.4'(RA) x 20.1'(Dec)
      95.5mm x 67.8mm
      
      where unvignetting region is restricted in
      outer 29.4mm(8.7') along Dec
      
    • II gain of IICCD can be controlled with control WS.
      
    • Automatic(hardware) shutdown of II is available for IICCD when too bright light goes into II CCD.
      

• Dome Flat:
  
  Harogen lamp is fed to telescope tube top with fibre bandles to illuminate projector screen on dome insides.

• Spectral Comparison source :
  
  Hollow Cathode tube is now available(1996). Fibre-bundle-fed comparison source is supplied when the telescope mirror cover closed, as the fibre is attached cassegrain cover portion.

• Control:
  
  • WS： Sun SPARC compatible WS: Solbourne S4000
    
    Memory 40MB, 25.5MIPS
    19" color CRT display
    HD 200MB + 1.3GB + 1.0GB
    DAT 2.0GB @ 180 min DAT
    
  • Controlable unit of OOPS from WS
    
    guiding unit
    aperture unit
    Filter wheel #1
    Grism wheel( Filter wheel #2 )
    Ratation of half wave plate
    Shutter
    gain of II on IICCD
    shuuter for IICCD
    High voltage supply for IICCD
    switching of Polarization mode and Direct mode
    

    CCD camera( Messia II )
    

  • Semi-automatic observation available with scheduler process.

  • Data headers are collected from OOPS and telescope with help of logger process
    
  • Observation data is stored temporalily in Hard disk and after observation run , stored in DAT.

• Related diagrams
  • Diagrams of Optics
  • Configuration of network around OOPS and 91cm Telescope
  • Retardance curve of half-wave plate
  • Sensitivity Curve of CCD TI-215