Summary of Meeting Discussions:
All. Nominate secretary: Dustin McNulty
All. Approval of last week's minutes:
Eric presented some additional plots demonstrating the strange "beat" structure in raw TDCs; this is from item 1 of previous weeks minutes. It was suggested that this could be artifact of hardware or binning mistake. It turns out there was a small problem with binning but fixing this did not remove the beat structure which by the way has a periodicity of 2ns. The variable which exhibits this 2ns structure is the TDC time difference between adjacent hits in the tagger--Eugene quickly pointed out that this is not a problem but simply the RF structure of the accelerator.
All. New Business: Itemized below
1: Dustin announced his participation in a Chiral Dynamics Workshop in Osaka, Japan early next month. He will be giving a 25min practice talk Thursday March 24 at 2:30pm in trailer city conference room 84. Everyone is invited; the title of his talk is "pi0 lifetime measurement".
2: Aram deferred his topic to next weeks meeting to minimize repetition.
3: A discussion started about how to implement Aram's flux numbers and associated good event regions into the analysis. Dustin reiterated his intension on putting flux numbs and good event regions in book_keeping DB. Eugene commented that you should not query the DB every event during the analysis because it is too slow; he suggested the use of ascii files was much faster. Perhaps the DB could be queried once at the beginning of each run to load the good event regions for that particular run into memory.
4: Another discussion about Aram's work was raised by Dustin. He suggested that we put, into the DB, all pertinent data associated with each 10 second time interval used in Aram's flux calculation for each run. Furthermore, we should do this before good event regions are selected to take full advantage of the speed and power of the DB. An offline discussion of this topic took place after the meeting between Mark, Aram, and Dustin. During this meeting, it was agreed that Aram would provide this data for each time interval and that the pertinent data would include: begin event number, end event number, number of electrons found in each of the 10 T-counters, livetime, total flux, uncertainty in flux.
5: Final topic of the meeting concerned the lack of scaler events in our data. Dustin said he had email discussions with Dave Lawrence about this and the conclusion was that this data was lost. Here are the emails. Eugene suggested that we still should look at the hardware bank for the scaler events--they may actually be there.