PMT%20time%20offset%20calibration%20(not%20completed) - PowerPoint PPT Presentation
Title:
PMT%20time%20offset%20calibration%20(not%20completed)
Description:
Database to store time offset of each PMTs were prepared. ... This is available with 'xec' affiliation. ... Time offset simulation was added to bartender. ... – PowerPoint PPT presentation
Number of Views:21
Avg rating:3.0/5.0
Title: PMT%20time%20offset%20calibration%20(not%20completed)
1
PMT time offset calibration(not completed)
- R.Sawada
- 27/Dec/2007
2
- Database to store time offset of each PMTs were
prepared. This is similar to gain and Q.E.
database. - A task to compute time offset by using LED runs
was prepared (XECPMTTimeOffsetCompute). This is
available with xec affiliation. - Time offset calibration during analysis was added
to XECPMTFill task. This is used when DRS time is
used for analysis. - Time offset simulation was added to bartender.
Time offset during simulation and analysis can be
different.
3
(No Transcript)
4
Procedure 1 (Estimation of time)
Estimate time
Correct run offset
At the end of these steps, following data is
obtained. A point corresponds to a PMT in a run.
Time offset nsec
Distance cm
5
Procedure 2 (Minimization)
Parameters Speed of light, time offset of each
PMTs.
Minimization is done by Minuit. Parameter for
Minuit is only the speed of light. Minimization
of time offset of PMTs is done in fitting
function.
At the end of these steps, following data is
obtained. A point corresponds to a PMT in a run.
Time offset nsec
Distance cm
6
Result ?
- It seems there is still a problem to align time
of different runs. The final result will be after
the problem is solved. - With current implementation, speed of light is
faster than c. This might be solved by improving
alignment of runs.
Time offsets are shifted so that mean of all PMTs
becomes zero.
Recommended
CrystalGraphics Presentations
