June 11, 2003Tracker Geometry ReviewJ. Bogart 1 Tracker Geometry XML description fundamentals Description of tracker Restrictions and problems the XML.

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Presentation transcript:

June 11, 2003Tracker Geometry ReviewJ. Bogart 1 Tracker Geometry XML description fundamentals Description of tracker Restrictions and problems the XML description

June 11, 2003Tracker Geometry ReviewJ. Bogart 2 Geometry Document Structure Primary constants –material names –integer constants (counts) –floating point constants (dimensions, offsets) Derived constants (mostly offsets) Build and nest volumes Identifier constraints – not of interest here

June 11, 2003Tracker Geometry ReviewJ. Bogart 3 Constants To see constants and their values, go to and click on one of the links for combined all-subsytem constants, which will bring you to a page like this one.this one The list is divided into categories by type (materials, integers, floating point) subsystem (TKR, CAL, ACD, NAD – Not A Detector, and global) and Primary versus Derived.

June 11, 2003Tracker Geometry ReviewJ. Bogart 4 Building the geometry Define primitive (uniform material, simple shape) volumes Assemble into stacks along an axis or Position individually in a composition volume. Compositions always have an explicit envelope volume; stacks never do. May have arbitrary levels of nesting. Dimensions and offsets appearing in the source volume descriptions are always referred to by name as previously- defined primary or derived constants. Literal numeric constants are never used.

June 11, 2003Tracker Geometry ReviewJ. Bogart 5 Typical volumes <box name="TKRCloseoutRegLong" XREF="TKRCloseoutLen" YREF="TKRCloseoutWidth" ZREF="TKRCloseoutThick" materialREF="TKRCloseoutMat“ /> Primitive volume (box). Has a name, material and dimensions. May also be marked as sensitive.

June 11, 2003Tracker Geometry ReviewJ. Bogart 6 Typical volumes Stack along z-axis. Since components are immediately adjacent and are all centered in transverse dimensions, no explicit offsets are required.

June 11, 2003Tracker Geometry ReviewJ. Bogart 7 Typical volumes.... (more closeout pieces go here) Composition of core+closeout+MCM boards. Core is centered, needs no offsets.

June 11, 2003Tracker Geometry ReviewJ. Bogart 8 Tracker volumes All geometry description source files can be found in the package xmlGeoDbs. Several physical files can be assembled into a single XML document (which is what the application sees) by using external entities. The top file usually used for LAT geometry is xmlGeoDbs/xml/flight/flightSegVols.xml Tracker volumes are defined in the file xmlGeoDbs/xml/flight/flightTKROneTkr.xml

June 11, 2003Tracker Geometry ReviewJ. Bogart 9 Tracker volumes (2) Each tray consists of (approximately) box-shaped volumes of glue, closeout material, tungsten converter, silicon, etc. A new box must be defined whenever a volume is made of a different material from a similarly-shaped box. whenever any dimension differs from a previously-defined box. (sometimes) when a rotated version of a pre-existing box is needed...so it should come as no surprise that the tracker requires lots of boxes.

June 11, 2003Tracker Geometry ReviewJ. Bogart 10 Limitations The description includes some simplifications: –perfect boxes (or cylinders) for all volumes –some thin layers combined into invented average material Currently no good way to position a stack at the edge of its containing volume. –need to know extent of stack along stacking axis; sometimes we don’t

June 11, 2003Tracker Geometry ReviewJ. Bogart 11 Recent problems Towers were too high. This was just inattention on my part, easily fixed once discovered. As of 11/02 I had “fixed” problem of ACD side supports colliding with grid by raising ACD, making it too high relative to tracker. In May instituted a much more acceptable fix: moved side supports outwards slightly, put ACD back down. CAL and TKR were centered in stay-clear boxes rather than positioned towards plane z = 0. TKR still has wrong z-offset.