[G14_run] Quick study of initial results from g14b

[Reinhard Schumacher]

Hello Natalie,
	Nice plots.  Can you plan to talk us through this set of plots at the 
Thursday meeting?

Reinhard
___________________________________________________________________
Reinhard Schumacher         Department of Physics, 5000 Forbes Ave.
Carnegie Mellon University, Pittsburgh, PA 15213, U.S.A.
phone: 412-268-5177         web: www-meg.phys.cmu.edu/~schumach
___________________________________________________________________


Natalie Walford wrote:
> Hi,
> With Franz, I have made a small study to compare a g14a run with two g14b
> runs since there was a problem with timing. I noticed the problem with the
> timing when trying to cook some runs (from first week of data taking) and
> not enough events were getting thru. With the study, it appears that most
> of the problems have been solved. We updated the tagger and TOF 
> calibration constants (only doing a 'quick and dirty' calibration) and
> then Sergey linked the updated g14 calibration index to the trigger for
> better results. We will also do a quick update to the start counter
> calibrations as well which you will be able to see if the following
> webpage, still needs a little help. Also, please take notice of the vertex
> distribution at the end, interesting and different plot than we have seen
> from the fast reconstruction done in the counting house. Please note that
> these are very preliminary and initial results and I have only used a few
> random sectors or regions for certain histograms. Over 200 histograms are
> produced and don't think everyone wants to see every single one. So, with
> Franz, we believe an improvement has been made with the timing and things
> are looking good and hope everyone can see it.
> 
> http://wwwold.jlab.org/Hall-B/secure/g14/TOF_CALIB/test/g14_test.html
> 
> Thanks,
> Natalie
> 
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