HETG Plate Focus Simulation, June 1998

• Capella HETG-First-light Observation
  
  

  One of the key first-light activities with HETG is a "plate focus" set of exposures to verify/determine the HETGS focus properties and optimal focus location. Capella provides strong, narrow lines at high dispersion for both the HEG and MEG.

  
  
• MEG and HEG Capella Spectra
  
  

  The widths of the bright lines of O VIII, Fe XVII, Ne X, and Mg XII are measured for each exposure.

  
  
• Plot of FWHM vs Defocus
  
  

  The exposures can be used to construct a FWHM^2 verus defocus distance plot for the zero-order, MEG line, HEG line. Note that the HEG and MEG shells are predicted to have slightly different defocus curves due to the as-built HRMA properties.

  
  
  
  
• More details are available at http://space.mit.edu.ezproxyberklee.flo.org/HETG/flight/oac.html
  
  
  
  

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