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Afternoon Activities

• Contact your SA (from Residencia, use radio or intercom to ask for Duty Officer) [CCD should be on and cooled, TILT and ROTATION checked.]

• COMPUTERS. Start up Perkin-Elmer ICS3220 if necessary (will give "" prompt). (See notes on wall by system console, in the tape-drives room)

• LOGIN. Check that the system is clear of other users, ask if in doubt. SI XYZ,n,n (write initials on board and dates resident) ADAM
• opportunity to change grating, collimator, etc.
• enter next archive image no. (for Grinnell TV images)
• enter chip installed (e.g. GEC3)
• dump to disk
• take default bias setting for now, or use value on board
• check MIMIC display; is everything okay?
• EXGRAT (to improve encoder accuracy for grating angle)
• if PREFLASH is needed (check with your SA) type:

  PROC CORRE T    
          SETFLASH 40        (if that is the advised value)
          RUN T "NAME"    
          END PROC

  and

  PROC MIRA T    
          SETFLASH 40
          GLANCE T
          END PROC

  use these procedures instead of RUN or GLANCE. ENABLE the flash at the CCD camera head.

• type in the following 2 procedures:

  PROC ARCON      
          IOPROCEED 1
          COMPMIRROR IN   
          1LAMP ON           this will be normally the CuAr lamp        
          IOPROCEED 0		
          END PROC

  and

  PROC ARCOFF
          IOPROCEED 1
          COMPMIRROR OUT
          1LAMP OFF
          IOPROCEED 0		
          END PROC

  (if you want CuNe instead, normally you have to type 2LAMP) Use PUT (and GET) to save (and retrieve) your procedures, otherwise they are lost each time you exit ADAM.

• FOCUS. If you are going to use more than one collimator or grating, check that the focus has not changed with each configuration. NOPACKETS (saves time during set-up, but remember to turn back on to observe using NOPACKETS=0) GLANCE 0 and use PHOT in STATS mode to determine bias level, b. Then BIAS b GSMOVE OPEN (opens grating shutter) IDS OPEN (opens spectrograph shutter) GRAT_ZERO 89.75 (check board for current value, check it using known arc lines.) CENWAVE (where is in ). You will need 2 strong, unconfused arc lines near the ends of the chip for focussing. Use the arc plots to help you choose. With CuAr, 7500 is a good region. SLIT 300 (150) for 235 (500) cameras. ASCF 2 inserts GG495 for red observing (to cut out 2nd order blue). ASND 0 ND 0 (arc filters not usually needed with CCD). GLA 5 (use a double length period for the Hartmann exposures) and then examine spectrum with PHOT to make sure the lines are not saturated. Lexidata buttons are :

  

  The BLUE button is used to mark the cursor position.

  SETUP (makes ROT, TILT and FOCUS available for use; note that a FOCUS adjustment has to be made after checking ROT and TILT) ROT Should already have been set (see 4.3.4) FOCUS performs Hartman tests for 5 collimator positions (or just 1 if a step of 0 is used). Note that shifts are given in 1/10 pixels. Takes about 15 mins. An alternative procedure if you have problems with FOCUS is TILT also performs a Hartman test (but for the current collimator position only). For the 2 chosen lines it gives, in addition to the mean shift, the L-R (along slit) and T-B (along spectrum) shifts. These should already have been minimised when the CCD was first set up by the SA. Hence minimise the mean shift by trying several collimator settings, using COLL n (where n should be in the range 170 - 240.)

  READY (to return to observing mode).

• FLAT FIELD This is potentially dangerous if the IPCS is also up. Check the Mimic display and keep an eye on the HP display. Use the TUNG lamp at CENWAVE 7500 and some ND (1-2) with a wide (200) slit to minimise dust streaks. However, you should also do a flat field at your observing setting to calibrate any such streaks. (Note that issuing TUNG will automatically set ND to its maximum value; you have to adjust them.)

  Do flat field in second order ( i.e. CENWAVE 14000) if low dispersion grating is used.