====== FTS Holography ======

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RAC, 16-May-2001


1.  Log into alpha1.
    SET DEF [FTS.ALPHA]
    RUN FTSRUN
    FTSRUN>  wlf     ( you should see a clean white light fringe)

2.  On alpha1, open a new window
    UIP
    UIP>  POINT FTS_HOLO    (load the FTS pointing file)
    UIP>  PLANET MARS

3.  Back in FTSRUN
    FTSRUN>  HCM      ( holography, complete map)
       accept all the parameter defaults for stage travel, speed, filter, etc.
       do a 15x15 map
       name the data file  yymmddxx.dat  where yy is the year, mm the month
       dd the day and xx =01 for the first map, 02 for the second, etc.
          eg.  01051701.DAT

4.  When map is done, start a new one with a new file name.

5.  Reduce the map you just made.
    a.  log onto Poliahu
    b.  SET DEF [FTS.ALPHA]
    c.  RUN [SERABYN.FTS]FTSANA
         FTSANA> M
           enter the file name you just made, eg 01051701.DAT
            FTSANA does some processing and then asks
             if you want the processing to be automatic.  Yes you do.
    d.  After FTSANA is done a processed file is written to
         [SERABYN.HOLO] with a .SKY extension
    e.  To see the map in a new window on Poliahu:
        SET DEF [SERABYN.HOLO]
        RUN MAP
          MAP>  INP   (input file name)
                01051701.SKY
                select a frequency range.   The peak response
                of the instrument is around 450GHz if you are
                using the 560LP filter on the bolometer and the 20" cone in
                bolometer.   However, if the sky is bad, try around 350GHz
                and you might get better s/n.

          MAP> CEN      (fit out pointing offset)
          MAP> INP      (reload input file)
          MAP> SHI      (based on result from CEN)
          MAP> FIT      (fit out 2nd parameters)
                
          MAP> PLO      (plot out the phase and power on the sky)
          MAP> FOUR     (fourier transform to the aperture plane)
          MAP> FIT      (fit out gradients due to pointing; 
                                      and subreflector x, y,  focus)
          MAP> PLO      (plot out the phase and power in the aperture plane)
          
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