System Tests Report Summary
Differences for the comparison with the previous release, GR v15r36 are expected from removing the ACD geometry change that was added in GRv15r35.
Changes
- xmlGeoDbs - update to use trapezoidal ACD tiles (GR v15r35) rolled back
ACD Geometry Changes
The flagged plots showing variations are
- ACD POCA distributions for the AllGamma, VeritcalGamma100GeV, and VerticalGamma300GeV tests
- ACD MIP and PHA distributions for the BackGndMixDC2 test
- McPositionHits for the BackGndMixDC2, VerticalGamma100GeV and VerticalGamma300GeV tests
Although these are not flagged, the ACDGAPDIST and ACDPOCA plots show minor differences for the background test.
All of these are quantities that are sensitive to changes in the ACD geometry.
This change affects side tiles and so the vertical tests are not very sensitive to it.
Also, the trapezoids (r36) are bigger than the squares (r37). You can see that in general and as expected there are more entries (hits) in the ACD plots for r36.
Eric C. took a look at the recon files for these releases. The plot below shows the difference in the edge of tile 110 for v15r37 (black) vs v15r36 (red).
The effect on the ribbons was not obvious, but Joanne adds:
Just one small footnote - the ribbon geometry is slightly different since the ribbons follow the tiles; see schematics at http://www.slac.stanford.edu/exp/glast/ground/LATSoft/geometry/pictures/ACD/newSides/XRibbonAnnot.png
(older geometry)
and http://www.slac.stanford.edu/exp/glast/ground/LATSoft/geometry/pictures/ACD/newerSides/v1r45p2-Xmeas-print.png
