VIRUS Defocus Spectral Flat (DSF) Procedure

Note that this procedure can take 15-45 minutes per unit, depending on the warmup times and commands used. If you are attempting to acquire DSF data for multiple units, be warned that it may take some time.

Procedures for setting up the UNITS:

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New script (testing mode for now)

Run ~sir/dev/astro/operations/virus_tests.sh <vac|dsf> [-skipip]

"skipip" only if you do not need that script deal with IP and VG.
Script first warm up lamps and entering test mode to determine correct exposure time. It will ask for max flux level after each test exposure and will display corrected exposure time. Available commands are:

next go to next IFU cals finish testing and run/print cals block quit exit the script

Procedures for taking the data

Note we are trying to use the same numbering for engineering tests so for the test exposures please use the 6000s and the final DSF exposures please use 7000-7099. Test exposures can be taken in the 6xxx range.

Here is a brief summary of what we do to take the data:

• ipvg off -V # Turn off the IP and VG

• Optional: manually turn on the LDLS, if you want to skip warmup times for each exposure.

• cal virus -l ldls_long -L 1 -o 6000 -bexp 1.3 # take a single exposure with twice the exposure time to test exposure length
  • optional: if you have already warmed up the LDLS, just use: cal virus -l ldls_long -L 1 -o 6000 -bexp 1.3 -skip_warmup

• cd /hetdata/data/YYYYMMDD/virus0006000/exp01/virus/ # where YYYYMMDD is the current UT date (note takes 1-2 minutes for all files to arrive)

• virusview ### # look at the unit you need (S###) - it should be about 45k counts.

• cal virus -l ldls_long -L 1 -o 6001 -bexp X.X # where X.X is the new exposure time based on the previous exposures
  • optional: again, you can use the no-warmup option for more efficient results: cal virus -l ldls_long -L 1 -o 6001 -bexp X.X -skip_warmup

• cd ../../../virus0006001/exp01/virus/ # change directory to where the new data is (note takes 1-2 minutes for all files to arrive)

• virusview ### # look to be sure that the relevant unit (S###) has the correct level at ~45k.

• cal virus -l ldls_long -L 30 -o 7000 -bexp Y.Y # where Y.Y is the final exposure time based on the previous exposure
  • optional: no-warmup version: cal virus -l ldls_long -L 30 -o 7000 -bexp Y.Y -skip_warmup

• repeat this process for as many units are required

• ipvg on -V and turn off LDLS it is still on.