The DEIMOS Slitmask Calibration Widget provides a simple means
to acquire calibration data (arcs and internal quartz flats)
for a series of slitmasks, allowing you to get dinner, sleep,
etc., while it carries out your calibrations. Follow these
instructions to use it:
- Launch the tool from the DEIMOS background menu by
selecting DEIMOS Utilities > Slitmask
- Configure the spectrograph for taking calibrations:
- Close the hatch.
- Extinguish lamps.
- Set grating and central wavelength as desired.
- Under ARCS, set the number of
arc exposures to acquire, the exposure time, and the desired
lamps to use.
- Under FLATS, set the number of
internal quartz flats to acquire and the desired exposure
- Under SLITMASKS, click on the
names of all masks to be calibrated with this configuration.
- Under OPTIONS, select Wait for FCS updates between exposures to
have the script pause in between each slitmask to allow FCS to
update 2 times and presumably recenter. If this is selected,
FCSTRACK must be running or the script will hang.
- Under OPTIONS, select Do end-of-night shutdown when done to
have the script shutdown the instrument software after the
calibration exposures are completed. This allows you to go to
sleep at the end of the night while the script completes your
- Click GO to start acquiring
data with the calib script.
Calibrating with Blue Lamps
When you acquire arcs with one of the “blue” arc lamps
(Cd, Zn, or Hg) enabled, the script will wait 3 minutes per
mask for the lamps to reach peak flux unless you follow these
When this is done, the arc lamps remain “on” during the
arc sequence and the script only waits for the 3 min warmup on the
first mask. Although it's a minor hassle to have to run separate
exposure sequences for arcs and flats, doing so saves a lot of time.
- set the number of flats to zero (i.e., do the flats and
- disable the Wait for FCS updates
between exposures option on the GUI