The attached file gives some of the results from Karen's survey of
20/5/05.
These data are from surveying the wire chambers using the survey
targets (remember TGT's are 7.94 mm which is different from TB's
which are 12.7 mm long). This survey was done with the WC's in the
sub-detector frame but with the sub-detector frame rolled out so not
in their correct positions. To get the values in the file Karen
applied a transformation such that the transformed coordinates were
as close as possible to the ideal ones (from CAD) but not allowing
the transformation to pitch or roll the chambers. Thus the
transformation is a translation plus a yaw (rotation about Y axis).
Thus the data preserves the actual pitch and roll of the chambers
plus the relative location of each chamber to each other within a
sector.
Note Karen's coordinate system is different from the BLAST system so
the 3 coordinates in the file correspond to the Z, X, Y coordinates
in the BLAST system. Units are mm.
The importance of this data is that it gives the relative location
of each chamber with respect to the others in a sector. It does not
give the final position or orientation when the sub-detector is closed.
Cheers,
Douglas
26-415
M.I.T. Tel:
+1 (617) 258-7199
77 Massachusetts Avenue Fax: +1
(617) 258-5440
Cambridge, MA 02139, USA E-mail:
hasell@mit.edu
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:33 EST