- Previous message: Trine S. Tveter: "RE: Drift Velocty Variations of TPM"
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Hi,
I've tried to calculate the drift velocities using the Fibers for TPM2.
Drift Velocities in TPM2 can be calculated by
DV = Distance between two Fibers in TPM2 /
Calculated Distance from tracks between two Fibers *
Drift Velocity Used for the Analysis.
= 5/(~4.7) * 1.6
(See the attached Figure 1 for the distribution from a single run.)
It seems that the velocities calculated using Fibers are higher
(1.6-1.75) than the value we are currently using (1.6) for TPM2.
The good news is Ramiro's monitored values track the variations
very well (with a scale factor). (See Figure 2)
The drift velocities in the plots were from the averaged
contributions from the all rows used in the tracking since the
Fiber positions were calculated from projected tracks.
For the most of "good" runs we have (after run# 52XX, including
all high-pt runs), the readout for the last two rows (19th, 20th)
of TPM2 were moved to the 17th and 18th rows since we knew
the variations of the rows were the most for the rows at the near
gas in/outlets. Due to the same reason, the 1st row of TPM2 was
not included in the tracking also, even thought the row was read out.
JH
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