[Olympus] Weekly Meeting Minutes

[Brian S. Henderson]

Hello all,

I have included the minutes from the OLYMPUS weekly meeting below. They =

are also available on the wiki =

(https://olympus-docu.hiskp.uni-bonn.de/dokuwiki/doku.php?id=3Dcompiled_min=
utes_of_the_weekly_meetings).

Brian


      December 9, 2013

  *
    D. Hasell opened the meeting by announcing that the OLYMPUS NIM
    paper has been posted to the arXiv (http://arxiv.org/abs/1312.1730)
    and as a DESY pre-print. Also, the paper has been submitted to NIM
    and we are waiting to hear on referees, etc. In the submitted
    version, "The OLYMPUS Collaboration" was added beneath the title,
    but it is unclear if this will be allowed in the official published
    version.
  *
    D. Hasell then opened the floor for general comments and questions.
      o
        S. Belostotski offered his congratulations on submitting the paper.
      o
        Question from J. Bernauer: What is the status of the beam
        position monitor (BPM) survey?
          +
            Response from U. Schneekloth:
              #
                Measurements were done several weeks ago and some of
                those results were shown in November. One BPM was found
                to have good one-to-one correlation while the other
                showed a linear correlation with the wrong slope.
              #
                Tests were done to show this slope was not due to the
                electronics.
              #
                Further tests showed that the wrong slope shown by the
                second BPM was mostly likely due to a problem with the
                test stand. A combination of attenuation and single
                reflection in the test wire caused the second BPM to see
                a weaker pulse that it should have. This hypothesis was
                tested by adding attenuators to the signal line, which
                produced a similar effect.
              #
                Further progress on the BPMs is currently limited by
                manpower issues, the engineer/technicians working on the
                test stand have been reassigned to other projects
              #
                A retired expert is now lending a hand with the
                measurement, and has made some suggestions for improving
                the test stand.
              #
                These improvements will require some machining of new
                new parts and some changes of the signal line couplings,
                which will likely take several weeks.
              #
                U. Schneekloth has looked at the BPM data from the
                experimental runs, and in general sees good correlation
                between the different monitors and the expected behavior
                during beam scans. Some of these results may be
                presented in the next few weeks.
          +
            Question from J. Bernauer: Will we need another survey of
            the test stand setup?
              #
                Response from U. Schneekloth: Yes, Martin has been
                contacted, but nothing has been scheduled so far.
          +
            Question from U. Schneekloth: Has the data from the first
            survey of the BPM test stand setup been looked at?
              #
                Response from J. Bernauer: The data has been quickly
                looked at and appears to be complete, but no detailed
                analysis has been done with it.
          +
            Question from J. Bernauer: So it is likely that we will have
            something on the BPMs in January?
              #
                Response from U. Schneekloth: Yes.
          +
            Comment from D. Hasell: Since next Monday is likely to be
            the last collaboration meeting of the calendar year, it
            would be nice to have some of the existing BPM results
            posted in the next week for people to use.
  *
    Prepared talk: Radiative Generator Asymmetries
    <https://olympus-docu.hiskp.uni-bonn.de/dokuwiki/lib/exe/fetch.php?medi=
a=3Dmeetings:20131209:20131209_schmidt.pdf>
    - A. Schmidt
      o
        A. Schmidt presented an addendum to his talk from December 2 to
        examine the asymmetry in the radiative corrections for e+ and e-
        produced by the MIT radiative generator compared to the results
        of Maximon and Tjon. He reviewed the procedure for the
        comparison, and then showed that the results from the MIT
        generator are in good agreement with Maximon and Tjon in the
        recent of validity (small ?E). He also concluded that the
        magnitude of the e+/e- correction asymmetry is not strong
        dependent on the position of the ?E cut, which is good for our
        analysis.
      o
        Questions/Comments:
          +
            D. Hasell: How many events are in the histograms shown?
              #
                A. Schmidt: 100,000 per species, per fixed angle.
          +
            J. Bernauer: How many events per bin does that correspond to?
              #
                A. Schmidt: The largest bins contained on the order of
                thousands of events.
  *
    D. Hasell called for any other comments/questions, and there were
    none. He concluded the meeting by noting that next week's meeting
    will be the last of the calendar year before the holidays.

Minutes compiled by: --- /Brian S. Henderson <mailto:bhender1 at mit.edu> =

2013/12/09 16:59/ Tsch=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FC=FCss=
ssssssssssssssss!!!


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