European Southern Observatory New Technology Telescope

General :
Observations :
Operations :

Grism Setup

Grisms are mounted on a wheel offering 9 positions, one being always free.
Positions 1 to 5 are used for low dispersion spectroscopy (RILD).
Positions 6 and 7 are used for cross-dispersion in Echelle mode.
Focus wedge is mounted permanently in position 8 and should never be removed.
To install a grism :

• Press EMMI emergency stop button at the center of EMMI cover.
• Remove the black side cover of EMMI red very carefullly to avoid
  to damage the grism motor.
• From the EMMI configuration panel, select grism pos and click "move to load".
• Remove the grim which occupies the position and install it in an other
  free position or into a grism box.
• Install the requested grism in position
• From EMMI configuration panel, select grism pos , select grism name
  and click enter grism.
• Click Backup under File submenu.
• When all requested grisms are installed , put back the side cover very carefully.
• Check that pinhole is mounted in Starplate wheel.
• Release the emergency stop button.
• Align grisms newly installed in positions 1 to 5 , running template RILD_spec_tec_GrisAlign for each of them.
  ( In cross dispersing positions 6 and 7 , alignment doesn't make sense).
  
• Check that EMMI configuration panel is modified accordingly.
• Click Backup under File submenu.
• Run RILD_img_tec_FocWdgAlign.
  
  

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