RIBBON DATA:
An accurately controlled and measured Co-57 X-ray source was used to
measure positions of fibers within each ribbon of the D0 central fiber
tracker. This source was chosen since the 122 KeV X-rays could reach both
layers in the ribbon simultaneously. Also, the amount of light from these
X-rays was similar to what we expect a minimum ionizing particle to give.
To do a measurement, we placed the ribbons in the molds that were used to
fabricate them and mount them on the cylinders. We placed black paper over
the ribbon, drew vacuum on this setup, and then scanned the source in
small steps across the ribbon - about 10 points or so per fiber. The
scintillation light from the fibers was measured by a multiplexed set of
16 phototubes. Six or more scans were made along the length of the ribbon.
The counting rates in the fibers as a function of the position of the
source were fit to a Gaussian peak above a linear background. Using these
fit values for the Gaussian center, all of the positions of the fibers
were fit to a single pitch value for the whole ribbon. Deviations of each
fiber's position from this single pitch value were plotted as a function
of the fiber number. This is the first graph for each scan. The
integrated counts for each fiber were averaged for each phototube and the
deviation from this average was plotted vs fiber number. This is the
second graph. The third graph is simply the 1-dimensional projection of
the deviations from graph 1. The fourth graph is simply the absolute
count rate for each fiber as determined by the Gaussian fit. An
additional page for each scan contains four other graphs with information
about the fit parameters. We also produced a text summary for each ribbon
where average quantities and large deviations are recorded.
CONNECTOR
DATA: It was measured the X and Y coordenates of some grooves with the microscope and plotted the deviations from the theorical value.
MOLD SET UP
DATA: Here goes the description from Leo
CYLINDER DATA:
Here goes the descriptio from Dookee
MOUNTING
MACHINE ALIGNMENT DATA: Here goes the
description from Leo
MM RIBBON
DATA: Here goes the description from Ariel
MM
MEASUREMENTS: Here goes the description from
Gaston
NESTING DATA:
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