AgML vs AgSTAR Comparison

Abstract: We compare the AgML and AgSTAR descriptions of recent revisions of the STAR Y2005 through Y2011 geometry models. We are specifically interested in the suitability of the AgML model for tracking. We therefore plot the material contained in the TPC vs pseudorapidity for (a) all detectors, (b) the time projection chamber, and (c) the sensitive volumes of the time projection chamber. We also plot (d) the material found in front of the TPC active volumes.

Issues with PhmdGeo.xml

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

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%. -------------------------------- 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 Issues with TpceGeo3a.xml 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. Issues with PhmdGeo.xml Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file. These should be fixed, but need to verify.
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes

STAR Y2010c Geometry Tag Issues with TpceGeo3a.xml 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. Issues with PhmdGeo.xml Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file. These should be fixed, but need to verify.
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes

STAR Y2009c Geometry Tag Issues with TpceGeo3a.xml 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. Issues with PhmdGeo.xml Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file. These should be fixed, but need to verify.
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes

STAR Y2008e Geometry Tag Global Issues Upstream areas not included in AgML steering routine. Issues with TpceGeo3a.xml 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. Issues with PhmdGeo.xml Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file. These should be fixed, but need to verify.
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes

STAR Y2007h Geometry Tag Global Issues Upstream areas not included in AgML steering routine. Issues with TpceGeo3a.xml 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. Issues with PhmdGeo.xml 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.
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes

STAR Y2006g Geometry Tag Global Issues Upstream areas not included in AgML steering routine. Note: TpceGeo2.xml does not suffer from the overlap issue in TpceGeo3a.xml
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes

STAR Y2005i Geometry Tag Global Issues Upstream areas not included in AgML steering routine. Issues with TpceGeo3a.xml 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. Issues with PhmdGeo.xml Two cases where the AgSTAR parser truncates a line in the phmdgeo.g file. These should be fixed, but need to verify.
(a) Material in STAR Detector and daughters	(b) Material in TPC and daughters	(c) Material in TPC active volumes	(d) Material in front of TPC active volumes