[g13] g13a calibration timelines are posted

[Yordanka Ilieva]

Dear Colleagues,

The g13a calibration timelines for the A10 cooked files can be found at:

http://www.jlab.org/Hall-B/secure/g13/TOF_CALIB/g13a/global_monitoring/pass2_v1_April2011/index.htm 

http://www.jlab.org/Hall-B/secure/g13/ST_CALIB/g13a/global_monitoring/pass2_v1_April2011/index.htm 

http://www.jlab.org/Hall-B/secure/g13/TAG_CALIB/g13a/global_monitoring/pass2_v1_April2011/index.htm 



Nick has looked at the tagger timelines and confirmed that the 
calibration is all right. Overall the calibrations for ST and TOF are in 
a very good shape. Based on my observations we can think of improving 
the following:
- ST: it is only two runs, 53453 and 53454, that give more than 300 ps 
timing difference for positive pions persistently for all the paddles. I 
am not sure if this is a feature of the A10 file only, or the entire run 
is shifted (both runs are deuteron production in the run database).
- the TOF looks very good overall. Some paddles show shifts above 300 ps 
for single runs. Particularly:
-- runs 53164, 53330 and 53331 are off for several paddles in sector1
-- runs 53566 - 53569 seem to be off for several paddles in various sectors
-- paddle 31 in sector 1 is off (the proton mass as well) for runs 53264 
- 53309. The shifts are some times as large as 5 ns, and based on the 
proton mass, this will result in inefficiencies of that paddle when 
standard cuts are applied, or the paddle will have to be knocked out of 
the analysis.
-- paddle 5 in sector 2 is off for runs 53469 - 53472
-- paddles 18 and 19 in sector 5 is off for runs 53383 - 53390
I asked Chuck and Danny to look into the above. We will have to discuss 
tomorrow the effort needed to fix these vs the effect on the analysis if 
left not fixed.

All the best, Yordanka