2 The CDF Experiment at Fermilab Contents - Harvard University ...

Section 2: Central Outer Tracker 9
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SL1 (Corrected)
SL3 (Corrected)
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Figure 2: Dierence between the desired eld sheet length and the measured lengths (corrected
for temperature and humidity variations) for the four stereo super-layers, in inches.
the expected resonant frequency, recording the amplitude at each point. The maximum
amplitude occurs at the resonant frequency. We nd the resonant frequency by tting
the amplitude vs. frequency distribution with a gaussian plus a at background, with the
mean being the resonant frequency. Figure 5 shows the output of the tension measurement
program for a single wire plane. The 25 plots arranged in a 55 array show the amplitude vs.
frequency distribution for all 25 wires of the wire plane. The measured resonant frequencies,
also converted to tensions using the linear density of the wire, are shown in the array atthe
left. Nominal tension on each wire is 150 g. Figure 6 shows the distribution of measured
tensions on all wires in each of the four innermost super-layers.
Since January, both students, Carter Hall and Robyn Madrak, and post-doc Kevin Burkett
have been running shifts, either to supervise chamber stringing, on the day and evening