[Halld-offline] Minutes, GlueX Offline Software Meeting, Dec. 1, '10

[Mark M. Ito]

Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_December_1%2C_2010#Minutes 
and as text below:

GlueX Offline Meeting, December 1, 2010
Minutes

Present:
* IU: Ryan Mitchell, Kei Moriya, Brad Schaefer, Matt Shepherd
* JLab: Hovanes Egiyan, Mark Ito (chair), David Lawrence, Lubomir
Pentchev, Elliott Wolin, Beni Zihlmann


Announcements

Mark reminded us about the latest release of sim-recon,
sim-recon-2010-11-29. See [34]his email for details.

Software responsibilities for TOF and Start Counter

We went over the [36]nominal assignments of responsibilities for
reconstruction of the TOF and start counter. The amended list will be:
* TOF: Paul Eugenio and Beni Zihlmann
* Start Counter: Werner Boeglin, Simon Taylor, Sascha Somov

Mark will ask the principals to summarize status at a future meeting.

FLUKA simulation of neutron flux

Sascha reviewed recent work on simulating radiation damage, especially,
but not limited to, that from neutrons in Hall D. The original
motivation was to study damage rates to SiPM's that will be used to
read-out the BCAL. As such, damage on silicon was studied. Also Sascha
and his collaborators Alberto Fasso and George Kharashvili were
interested in comparing the results of GEANT3 and FLUKA. Sasha led us
through the plots on [38]his wiki page. The agreement between the two
systems was better than a factor of two, which is considered pretty
darn good.

The version of FLUKA that has had the most recent development is a
stand-alone package with its own geometry system. Most of the work was
in capturing essential features of the GlueX detector geometry in
FLUKA.

A glance at the plots shows that the fluence in the area just upstream
of the start counters is within a factor of a few of that in the region
of the BCAL SiPM's indicating that SiPM's are not excluded from
consideration for the readout of that detector.

There might also be application of this set-up for estimating dose to
the FCAL insert. The damage to lead glass is of a different nature than
that to silicon and that would have to be taken into account.

Action Item Review

* David has eliminated a bunch of warnings that were coming from the
tracking code.


Review of recent repository activity

* David has been working on the simulation apparatus for the Compton
calorimeter being proposed for the η Primakoff experiment.
* Simon eliminated some warnings with judicious placement of {}'s in
the mcsmear package.


GEANT4

David raised the question of converting the Monte Carlo from GEANT3 to
GEANT4.
* Mark reported that Richard Jones is working on an implementation.
It gets its geometry from an HDDS file. The new geometry system
does not generate code that then gets compiled. Rather a
geometry-agnostic binary reads the HDDS directly and creates the
geometry on the fly.
* David thought that we need it sooner rather than later, and that
later might turn out to be never.
* Mark thought that we are not dead in the water using GEANT3 and we
do have a nominal effort in progress. That might be the appropriate
effort level.
* Elliott thought that we need to hire someone to do the job. We have
been saying that a new collaborator might take this on, but we have
been saying this for a long time.
* Mark shelved the discussion as it seemed that no end was in sight.
We will have to return to this question.


New Action Items

1. Get a report on start counter reconstruction.
2. Get a report on time-of-flight reconstruction.
__________________________________________________________________

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References

34. 
https://mailman.jlab.org/pipermail/halld-offline/2010-November/000438.html
36. http://www.jlab.org/Hall-D/offline/Software_tasks.php
38. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Comparison_of_radiation_damage_between_FLUKA_and_Geant