GSIM Overview

The Chain of GSIM analysis starts with an 
event generator such as Celeg or an AO based 
generator. If you write our own generator it is 
best to write it as a standalone code instead of 
building it into the GSIM user code.
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The next program in the chain, GSIM-PRE, is
optional. This code filters out those particle tracks
that would normally only hit a Torus coil, beam 
pipe or other structure.
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Most of the cpu time will be spend in the main
GEANT simulation GSIM. This is the reason 
why it is advantageous to have pre and post
filters for GSIM, so that a minimum of
calculations (and re-calculations) is done
at this stage.
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GSIMKO (now called GPP) takes the pristene
data file from GSIM and removes the dead wires
and photo-tubes. It will also be able to merge in
a background events file and add noise to detector
elements. This would also be the stage where MAP
dependent calibrations can be added to the data.
The DC  (x->t ) conversion could also be done here.
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TSIM takes the now modified data set and
calculates which if any trigger bit would have
been set if this was a real event. TSIM should
be able to eliminate those events that would
not have caused a trigger.
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RECSIS would form the last step of the
analysis chain when you want to determine
an acceptance. The PART bank from
RECSIS can be fed back into the top of the
chain (GSIM-PRE or GSIM.) This allows
for consistency checks.