[d2n-analysis-talk] LHRS VDC Tracking Efficiency Analysis

[David Flay]

Hi all,

I've finished some calculations and have written a technical note for the
VDC Tracking Efficiency.  You can find the note on the Wiki here, under
the VDC section:

https://hallaweb.jlab.org/wiki/index.php/Analysis_resources_for_d2n#Detector_Calibs

Overall, I've found that the (one)-track efficiency of the VDCs to be ~99%
for all kinematic settings.  two-track events tended to dominate the
inefficiency, on the order of ~0.70%.

The note contains full details of the calculation and how I carried out
the study.

I was going to do this study run-to-run; however, I would not have been
able to get a reasonable statistical error.  Therefore, I decided to stick
with the major kinematic settings as the grouping criteria for the data
sets.

I'll have the details of my note in our next talk, but I thought you may
be interested to read the note as well.  Suggestions for improvement are
welcome, of course!

Thanks,

Dave

P.S. -- I've also put a link on the Wiki to a very nice JLab technical
note concerning the construction of the VDCs, discussing also the
electronics and some tests they looked at.  A good read, and gives very
nice descriptions as to why certain quantities (like the t_0 histogram)
look the way they do.  You'll find this under the 'Other Resources'
subsection of the VDC section that I referred to earlier.

-------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
            flay at temple.edu

website: http://www.jlab.org/~flay
              http://quarks.temple.edu
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