
Previous page	Up to the index

CONCLUSIONS

In the table below are summarized the various tolerances. I reiterate that these apply if you want to preserve the option of efficiently extracting the vertex using no alignment calibrations.

efficiency loss	Si panel z-placement tolerance	Si panel angular placement tolerance	max bow-out at midpoint	max humidity excursion
-5%	0.08 mm	0.21 degrees	0.1 mm	9%
-10%	0.16 mm	0.42 degrees	0.2 mm	18%

As for the global positioning, the vertex finding algorithm has been upgraded so that is tolerant of lateral displacements of the MVD, relative to the mean beam position, of at least 3 mm. In addition, the algorithm is insensitive to small (at least 0.3 °) rotations of the MVD relative to the beam axis.This essentially removes global MVD mounting requirements.

last update 21 July 97 - Hubert van Hecke