Week Four
Learning the “real” software, continued
Alex George
Monday, June 16, 2008—
After our unexpectedly long
weekend, Dr. Horton-Smith showed us how to install Geant
4, even writing a macro that we could copy to get the software to work. We spent the rest of the day trying to
duplicate his instructions on our computers, and working across the additional
snags that we hit on our own machines.
We finally seemed to have it all working properly, however.
Tuesday, June 17, 2008—
We ran “lytest,”
a macro that was written exclusively for testing to make sure that the
installation seemed to be working properly.
Dr. Horton-Smith then showed us the documentation online so that we
could continue to learn Geant 4, and asked us to
modify lytest to simulate a very similar, but
different, effect, and to use root to make a histogram of that data. It took us the rest of the day to get this
working properly, but we had finally done our first actual simulation! We then experimented with outputting root
histograms in various colors.
Wednesday, June 18, 2008—
We continued to fiddle with our
programs while awaiting instruction.
Late in the afternoon, we were given choices of things that we could
simulate in the next few weeks, things much more complicated than what we had
already done. I chose to model
spill-in/spill-out effects – the chance that a particle generated on the inside
would be captured outside the detector, or alternatively the chance that a
particle generated outside the detector would be captured on the inside. By understanding this effect, it would be
possible to know if this effect were significant enough to warrant not using
parts of the detector, or whether this could just be subtracted off as
background noise.
Ethics class today!
Thursday, June 19, 2008 –
Thursday was spent reading and
trying to learn more about the spill-in/spill-out effect. Unfortunately, not much literature is
available on this subject, so many searches were in
vain.
Friday, June 20, 2008 —
Friday morning was a continuation
of “background reading” or lack thereof.
After lunch, Dr. Horton-Smith worked with us to help us write our macros
for the simulation itself, since he and Dr. Bolton would be away all of next
week.