July 31, 2007 Software

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  1. Review minutes from July 17, 2007 Software meeting
  2. FDC Beam hole size (David)
  3. Package Management (David)
  4. Action Items


Cebaf Center F324-325

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Attendees: David L. (chair), Simon T., Mark I., Elliott W., Mike W.

Phone: Benni, Mihajlo


FDC Beam hole size

David presented some plots from a special simulation done to help determine the distance from the beamline of hits at the FDC planes as a function of momentum and θ angle for π+s. The plots are meant to help understand what areas of phase space are being eliminated given the size of the dead area in the FDC surrounding the beam hole. The plots indicated that in order to have acceptance down to θ=1o and p=1 GeV/c, a smaller dead region than previously considered would be needed in the first and second packages. Also shown were some plots Alex made of the momentum angle relation of pions for specific event topologies. These indicated virtually no population of the phase space in the region of θ=1o and p=1 GeV/c.

Other relevant information that was not currently available was background rates for smaller a FDC beam hole size (down to 2.3 mm for the first package) and overall population of the area of phase space around θ=1o and p=1 GeV/c in general (e.g. as reported by PYTHIA).

Package Management

David briefly showed a wiki page he had made capturing the information needed to build RPMs and DEBs and set them up in a yum or APT repository on the web. Some of the benefits of package management were discussed. More study is neeeded however to clearly define the role such that the amount of work required to maintain such a system does not outweigh what is saved through its use.

Action Items

  1. Put updated collaboration list in DocDB and commit list to repository (Zisis)
  2. Develop system for incorporating alternative b-fields in simulation (Richard and David)
  3. Look at recent FDC geometry changes (Richard)
  4. Create an easy way to produce radiation length plots and document it (David)
  5. Review the digitization scheme(s) we have now and figure out how to make them more coherent (??)
  6. Remove "default" from calibration file directory path(David)
  7. Tie HDGeant and DANA constants to single source (David)
  8. Output configuration parameters database from DANA