GlueX Software meeting minutes

[David Lawrence <davidl@jlab.org>]

Hi Folks,

    The minutes from today's software meeting can be found on the wiki at:

http://www.jlab.org/Hall-D/software/wiki/index.php?title=August_21%2C2007_Software&action=edit

and are copied below.

Regards,
-David



==Minutes==

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

Phone: Andrei S., Mihajlo K., Alexander O.

===Announcments===

# The wiki authentication was changed to allow world access to read the 
site. New accounts must be created by either Mark or David. Accounts are 
needed only to modify the wiki.

# Elton suggested we look at the event size as an action item. It was 
agreed that this should be discussed at the next DAQ/online meeting.

== Event generators from Rad-φ==
''Richard was unable to make the meeting today so this was postponed 
until a lter meeting''

== Using pythia and HDGeant ==
Beni showed several plots from some simulation he did using events 
generated by pythia. He generated 150k events with the pythiagen program 
and ran them through ''hdgeant''. He modified hdgeant to dump the death 
points and particle types of all primary tracks into an ASCII file. This 
was then used to produce serveral scatter plots indicating the locations 
in the detector where the particles "died". Plots were shown for 
different particle types and with varying energy cuts. Also shown were 
multiplicity plots of particles of various flavor (proton pion, gamma).

Beni commented that the plots he produced were all done from a single 
vertex point within the target and that implementing an extended target 
vertex distribution should be done to a give a more realistic view.

Elke pointed out that some more tuning of the pythia parameters would 
give a more accurate representation of the hadronic background at Hall-D 
energies. She will work on this later in the fall.

David showed a few plots of the momentum/angle distributions for 
&pi;<sup>+</sup>, &pi;<sup>-</sup>, protons, and &gamma;s as generated 
by pythia. He generated 1 million events, but did not run them through 
''hdgeant'', only plotted at the thrown distributions.

==Action Items==

# Add extended target vertex distribution to pythiagen
# <s>Remove read-only password for Wiki</s>
# Complete "Version 4" Simulation geometry document. (David, Simon)
# Put updated collaboration list in DocDB and commit list to repository 
(Zisis)
# Develop system for incorporating alternative b-fields in simulation  
(Richard and David)
# <s>Look at recent FDC geometry changes</s> (Richard)
# <s>Create an easy way to produce radiation length plots and document 
it</s> (David)
# Review the digitization scheme(s) we have now and figure out how to 
make them more coherent (??)
# <s>Remove "default" from calibration file directory path</s>(David)
# Tie HDGeant and DANA constants to single source (David)
# Output configuration parameters database from DANA

-- 

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  David Lawrence Ph.D.
  Staff Scientist                 Office: (757)269-5567   [[[  [   [ [       
  Jefferson Lab                   Pager:  (757)584-5567   [  [ [ [ [ [   
  http://www.jlab.org/~davidl     davidl@jlab.org         [[[  [[ [[ [[[
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