GlueX Offline Meeting, November 2, 2010
Minutes

   JLab: Hovanes Egiyan, Mark Ito (chair), Dmitry Romanov, Simon Taylor,
   Elliott Wolin, Beni Zihlmann

Review of minutes from the last meeting

   We went over the [30]minutes from the October 19 meeting. There was not
   a lot of discussion. We did note that Beni and Dmitry should try and
   get together and see if we can import our current geometry into EVE
   using the HDDS-to-ROOT converter written by Ed Brash.

New Meeting Time

   We decided on a new time for this meeting, Wednesdays at 1:30 pm. It
   will continue to be every other week. This puts us back in the
   online/offline alternating meeting scheme for Wednesday afternoons.

CCDB Progress

   Dmitry brought us up-to-date on the status of the Calibration and
   Conditions Database. See [33]his slides for details. He talked about:
     * Modifications to the database table structure
     * A "console tool" that gives users an interactive shell like
       interface to the database.
     * The issues related to access privileges to the database.
     * A proposal for creating database activity logs as part of the
       database itself.

   We discussed the access privilege scheme for some time. There is a
   question on how fine-grained we need to be. Having a relatively
   complicated scheme not only makes the coding more difficult, but
   maintenance of a proper set of privileges can become a real chore.
   Having too simple a scheme might make it too easy to make mistakes or
   invite hackers. This needs to be discussed further.

Correlating Hits with Tracks

   Beni presented recent changes that are a precursor to being able to
   correlate reconstructed charged tracks with Monte-Carlo-generated
   particles by looking at the particle origin of the hits associated with
   the track. See [35]his slides for details. He discussed
     * Modifications to gustep to classify some "secondary" particles as
       "primary".
     * Modification of the digitizations routines in HDGeant to add
       particle parent information to the event on a hit-by-hit basis.
     * Where this information is located in the HDDM data model.
     * Modifications to the DANA container classes to accomodate to make
       this new data available to users.
     * Modifications to the HDDM-to-DANA conversion routine to transmit
       the data from HDDM to the container classes.
     * Examples of the new code in action.

   We noted that this process of adding information to the events is a bit
   involved. We did not get into the discussion of the separation of truth
   and hits and whether or not this principle is present in the GlueX
   Constitution.

Action Item Review

   We reviewed the list. The following items have been resolved recently:
     * (staylor) 2010-11-02 Do studies of a more uniform magnetic field.
     * (zihlmann) 2010-11-02 give a presentation on correlation between
       CDC/FDC hits and generated particles

   See the Offline Project on the [37]MantisBT pages for details.

New Action Items

    1. Try importing GlueX geometry into EVE. -> Dmitry, Beni

   Retrieved from
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References

  30. http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_October_19%2C_2010#Minutes
  33. https://halldweb1.jlab.org/talks/2010-11/db_tools_11-02-2010.pptx
  35. https://halldweb1.jlab.org/talks/2010-11/gluex_MC.pdf
  37. https://halldnew.jlab.org/mantisbt