Minutes y06m11d27
Present: David, Kotoyo, Sean (UW-Madison)
Dusan (Maryland) Carsten(Penn State)
Ignacio (Berkeley)
Aya, Keiichi, Mina, Shigeru (Chiba)
1. Status report of the Team Madison
The double peak structure of the angular resolution functions
has gone - by updating I3Calculator. Do not know why, but it works.
David is rewriting gulliver - Now it loops over all DOMs , not just
hit DOMs, but DOMs with no launches.
Keiichi made several modifications in the DRESS. For example it is able
to output total charge/Npes taking into account the narrower recording
window of fADC/ATWDs.
2. Status report of the Team Berkeley - Standard Candle
Shigeru reported that the initial observation of the photonics-based
simulation including the FY2005 Golden DOMs. The NPEs in the simulation
data appears higher than the real data indicated. Ignacio said
the Michaelangelo's study has suggested that the simulation data might be
brighter by a factor of 4/3.
Shigeru also showed his concern about the ATWD-based Npe distribution
in the simulation data.
Its FWHM looks way wider than the expected statistical deviation.
Ignacio suggested that it may be because the ATWD capture window is too narrow.
We need to investigate it further.
3. The EHE meta project.
The ice3sim V01-09-05 has been out. David has already included it
into the meta project. Because the meta project has several reco/analysis
modules that is not needed for MC data production, and because
the simulation-related projects are identical to those in this ice3sim release,
we use V01-009-05 itself for the up-coming massive MC data production.
4. Simulation
The reported strange behavior we have seen since V01-09-03 that
some events with low energies but huge NPEs was resolved by Aya.
It was a bug in the weighting-module. Now the data looks in good shape.
The plots are available here. The Npe-Energy relation taking the PMT saturation
into account has now ended up with very similar results by the DC1.
Keiichi reported that the IC-23 array simulation cannot configure
the strings properly. It comes with IC-9+AMANDA configuraiton
without any intensiton. The data base appears a problem.
The data taken from the I3DB should be able to be overridden.
Keiichi contacts Alex and Paolo to find a solution.
The EHE MC data production is scheduled to be carried out
at the Southern-U clusters as we did in the DC1 era.
5. The IC-9 data analysis
Aya showed several plots. The operation time and the event rate looks OK.
The duty cycle of the DAQ is about 70%. Number of events with Npe greater
than 10^4 is ~ 500. They are our data to study the background.
The Npe distribution follows the smooth power law with three indexes.
It gets steeper in the region of Npe > 10^4. It may be due to the short capture window
of ATWD/fADCs. Wait for simulation/atmospheric muon modeling for further study.
6 The empirical muon modeling
Shigeru explained its concept. The resultant spectrum is a bit harder
than our previous model obtained by fitting the Corsika data with no bundles.
In the zenith angle distribution more events are found in the vertically
downgoing geometry, which is consistent with the real data. The parameter
such as the effective threshold energy of muons in a bundle will be
determined by the real data.
7. The future analysis - IC-23 data
We keep separate the IC-9 data from the whole data so that we gain
the event statistics in the 9-string analysis until we publish it -
presumably around May 2007.
We need to organize the IC-23 analysis team. Because our confidence
on the present IC-9 analysis would also rely on the 23-string data,
this team is better to run its analysis in relatively independent
manner. The reco team (Keiichi, David, Sean) plus Dusan/Carsten
are the prime candidates in this team. Shigeru encouraged them
to review the present analysis chain before they start.
8. Next phone or video conference
January 15 (Monday) 6 pm CST - 16 (Tuesday) 9 am Japan