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Archived Messages for CLAS_DRIFT_CHAMBERS@cebaf.gov: dc wire position (sag)

dc wire position (sag)

Liming Qin (liming@physics.odu.edu)
Tue, 14 Apr 1998 16:04:17 -0400

Hi, everyone.
It seems the correction to R2 wire positions helped. And another known
effect is the wire sag because of gravity.

Sebastian estimated the maximum sag (at the middle of a wire) is 0.16mm
in the direction perpendicular to the wire. This is for the longest R2
wires and sector 1,2,5 and 6 only. There are same effects for R1 (smaller)
and R3 (bigger). This may help to resolve part of the sector dependent
problem and of large scattering angles.

Regards,
liming