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User name nmuangma
Log entry time 19:39:35 on March 26, 2011
Entry number 353314
This entry is a followup to: 353251
keyword=bigibite calibration continue...Another set of rootfiles are created after the change in t0 per individual card.
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There are at least three crucial factors in tracking reconstruction:
1. t0 for set the initial time to calculate drift time.
2. Drift time to drift distance conversion function.
3. Wire position calibration.
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The t0 is rechecked after the change of t0 time for each individual card. With the variation of +/-2 ns.
More precision will have to be made offline for each individual wire which requires a lot more statistic.
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The residuals of tracking for each plane are shown below.
Ideally, the residuals should be gausian about zero and independent of drift distance if the drift distance from constructed track is closed to the the drift distance from Time-to-distance conversion function.
The tracking reconstruction of chamber 1 shows sign of problem especially in u1 and u1p. Slightly structure for v1,v1p,x1, and x1p.
The chamber 2 has better distritution but some planes still favor the drift distance about +/-0.004.
A copy of this log entry has been emailed to: vasulk@jlab.org , doug@jlab.com, n.muangma@gmail.com,eip,orchen,sgilad@mit.edu,vasulk,rshneor,jwatson@kent.edu
Figure 1
