= 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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== 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.