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MMT Spectrograph Hardware Settings

Please Note:

This archive contains the latest hardware settings for the MMT Spectrograph. Most of these refer to adjustments that are made only by qualified MMTO Personnel; i.e. changes that the observer is not authorized to make. If you think any adjustment is required, contact Dennis Smith.

Blue Channel Settings

  • Current Dewar Shim: 0.025 inches
  • Tirp Height: 0.600
  • Collimator Coarse Focus (normal): 1.100
  • Collimator Coarse Focus (warm weather): 0.800
  • Grating Angle for Echellette Approximately on Blaze: 3.745
  • Grating Change Parameters, Normal Gratings: 
    
    Turret  Grating    Turret for       Turret for
    Number   Tilt     Cover Removal   Grating Removal
   ===================================================
      I       2.0         3.80             4.34
     II       2.0         2.32             1.85
    III       2.0         2.60             3.09
  • Grating Change Parameters, Echellette Grating: 
    
    Turret  Grating    Turret for       Turret for
    Number   Tilt     Cover Removal   Grating Removal
   ===================================================
      I       1.75        3.90             4.22
     II       2.0         2.08             1.85
    III       2.0         2.60             3.01

Red Channel Settings

  • Current Dewar Shim: none
  • Grating Angle for Echellette on Blaze: 4.675
  • Cross-Disperser Micrometer Setting for Orders 6-13: 430
  • Cross-Disperser Micrometer Setting for Orders 7-13: 480

Last Updated on November 19, 1994

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Comments / questions to Barbara Russ. Design by Reid Young.