[G14_run] Quick study of initial results from g14b

[Dr. A.M. Sandorfi]

Hi Natalie,

Very interesting initial look. Obviously the timing needs a little work. One
of the most interesting first things to look at is the vertex Z
reconstruction. This first pass required the EC which limited the view to
forward angles. We would like to viewed the target region near 90 degrees to
maximize the resolution. A comparison of the test target and the present
("silver") target would be important to look at. For that you will need to
look at the mid angle TOF without the EC. Can you try another pass through
the data with those conditions?

Andy



On 12/5/11 11:16 PM, "Natalie Walford" <natalie at jlab.org> 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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