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