Margret looked at the eta/phi range covered in the 2002 testbeam set-up. She found that The PS is systematically shifted in phi by +1.2. The HEC modules also have a phi offset: -0.1 for HEC1,2 and -0.2 for HEC3. These shifts already exist at the hit-level when looking at the events with LArG4Analysis Furthermore, there are some spurious cells in HEC2,3 about 180 deg opposite to the testbeam setup. Clearly, these cells shouldn't be located where LArG4Analysis finds them. Once the events have been processed through the reconstruction chain, these cells appear to `move' from HEC2,3 to HEC3,4. Rob suggested to compare the online and offline identifiers for these cells. Margret also gave a list of things she thought might be good for the DC3 monitoring and asked people to come up with other suggestions if they have any. Please let her know if you have any ideas!
Michel gave a detailed presentation on how he generated his new (and final) noise-files for the 2002 EmecHec testbeam. In order to produce the noise-files, he first had to re-produce all the Athena Ntuple, because the Ntuples previously produced by Naoko did not use the latest available calibration. Using Athena 9.0.4, Michel then carefully selected cells that had no signal contamination. He showed the fraction difference in noise obtained using different timing (TDC and global cubic time[GCT]) and found there is essentially no difference. He also computed the fractional noise-difference between different runs (again no difference) and finally he compared his noise files with the ones produced by Sven and pointed out the different approaches taken to obtain the noise, in particular the approximation made by Sven to assume that the noise/pedrms ration is a constant. One of the problems Michel ran into was that there used to be some cells that have noise=zero exactly; this is no longer the case with these new noise files. A little discussion then arose of how to go about to find noisy cells. Rob said that OPAL had a HotCellTool the found noisy cells and then masked them. It will be important to identify these cells once Atlas starts running. Richard thinks that the time with only one beam in the machine will be good for tracking these cells down.
Warren
presented an update on his work on the energy reconstruction.
He has looked at a few more runs from Run1 and indicated the impact points
of these runs on the diagram of the setup with `X2'.
He is now running with Athena 10.0.3 and the standard calibration by Pavol,
but will soon also look at using the OFC's.
One other item on his to-do list is to see whether the CTC contributes any signals.
He found out that it has the same per cell capacitance as the FCAL and the same
electronics as the FCAL.