Decription of the Plots

Below you will find four columns of plots, for the highest revision of each geometry from y2005 to the present.  The columns from left-to-right show comparisons of the material budget for STAR and its daughter volumes, the material budgets for the TPC and it's immediate daughter volumes, the material budgets for the active volumes in the TPC, and the material in front of the active volume of the TPC.  In the context of tracking, the right-most column is the most important.

Each column contains three plots.  The top plot shows the material budget in the AgML model.  The middle plot, the material budget in the AgSTAR model.  The bottom plot shows the difference divided by the AgSTAR model.  The y-axis on the difference plot extends between -2.5% and +2.5%.

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Attached you will find much more comprehensive set of plots, contained in a TAR file.  PDF's for every subsystem in each of the following geometry tags are provided.  They show the material budget comparing AgML to AgSTAR for every volume in the subsystem.  They also show a difference plot, equal to the difference divided by the average.  There is a color-coding scheme.  The volume will be coded green if the largest difference is below 1%, red if it exceeds 1% over an extended range.  Yellow indicates a missing (mis-named) volume in one or the other geometry, and orange indicates a 1% difference over a small area (likely the result of roundoff error in alignments of the geometries).

STAR Y2011 Geometry Tag

• TPA1 (tpc inner padrow) differences caused by overlap between TPA1 and a thin layer of G10 in the TPC. 
• The padrow overlap is in the "prompt hits" region.  We do not (yet) use prompt hits in tracking.

• Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file.  These should be fixed, but need to verify.

STAR Y2010c Geometry Tag

• TPA1 (tpc inner padrow) differences caused by overlap between TPA1 and a thin layer of G10 in the TPC. 
• The padrow overlap is in the "prompt hits" region.  We do not (yet) use prompt hits in tracking.

• Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file.  These should be fixed, but need to verify.

STAR Y2009c Geometry Tag

• TPA1 (tpc inner padrow) differences caused by overlap between TPA1 and a thin layer of G10 in the TPC. 
• The padrow overlap is in the "prompt hits" region.  We do not (yet) use prompt hits in tracking.

• Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file.  These should be fixed, but need to verify.

STAR Y2008e Geometry Tag

• Upstream areas not included in AgML steering routine.

• TPA1 (tpc inner padrow) differences caused by overlap between TPA1 and a thin layer of G10 in the TPC. 
• The padrow overlap is in the "prompt hits" region.  We do not (yet) use prompt hits in tracking.

• Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file.  These should be fixed, but need to verify.

STAR Y2007h Geometry Tag

• Upstream areas not included in AgML steering routine.

• TPA1 (tpc inner padrow) differences caused by overlap between TPA1 and a thin layer of G10 in the TPC. 
• The padrow overlap is in the "prompt hits" region.  We do not (yet) use prompt hits in tracking.

• Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file.  These should be fixed, but need to verify.

Issues with SVT.

STAR Y2006g Geometry Tag

• Upstream areas not included in AgML steering routine.

Note: TpceGeo2.xml does not suffer from the overlap issue in TpceGeo3a.xml

STAR Y2005i Geometry Tag

• Upstream areas not included in AgML steering routine.

• TPA1 (tpc inner padrow) differences caused by overlap between TPA1 and a thin layer of G10 in the TPC. 
• The padrow overlap is in the "prompt hits" region.  We do not (yet) use prompt hits in tracking.

• Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file.  These should be fixed, but need to verify.