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:

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.

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

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

• cal virus -c ldls_long -C 1 -o 6000 -bce 1.3 # take a single exposure with twice the exposure time to test exposure length

• cd /hetdata/data/YYYYMMDD/virus0006000/exp01/virus/ # where YYYYMMDD is the current UT date (note takes a few minutes to arrive fully)

• ds9v # look for all amps which were modified and the brightest one (based on the scale) should be about 45k.

• cal virus -c ldls_long -C 1 -o 6001 -bce X.X # where X.X is the new exposure time based on the previous exposures

• cd ../../../virus0006001/exp01/virus/ # change directory to where the new data is (note takes a few minutes to arrive fully)

• ds9v # look for all amps which were modified and the brightest one (based on the scale) should be about 45k.

• cal virus -c ldls_long -C 30 -o 7000 -bce Y.Y # where Y.Y is the final exposure time based on the previous exposure

• ipvg on -V

Proper syntax on Oct10,2019 is: cal virus -l ldls_long -L 1 -o 6001 -bexp 0.8