(present: MF, TH, TI, RK, ML)

Richard was wondering whether it would be possible to move the meeting time from 9am to 11am, as it seems unlikely that Rob and Naoko will participate very often. Tamara pointed out that she has lab meetings at noon on Friday, but the general feeling was to keep our meeting short, so that should be ok. Michel said he will confirm with Rob and Naoko and if it is ok with them and the reading room is free at that time, the meeting can be moved.


Tamara now has a basic set of requirements for her analysis. She plotted sigmaE/E for all but the 3 lowest energies and finds that it looks good (around 5-15%) with the one exception of the point at 100 GeV, which is way out compared to the others. She explains that that run has a double energy peak, which then of course gives a poor sigma.
She minimized the resolution by adjusting a constant factor C in: E(emec) + C*E(hec) and used the nA to GeV conversions from the INTAS report.
Next, Tamara will investigate the problem point and study systematic effects.

Michel pointed out that we should all read the INTAS report carefully. Naoko is in contact with Tamara and Michel about HEC HV corrections and other correction efforts. Upcoming priorities should include the HV corrections (particularly in the second wheel), and timing corrections.

Tayfun reported on his EMEC position analysis. When he plots the energies of the first and second EMEC compartments against each other, he finds a pattern of bands and clusters apart from the strong cluster left by the electron beam. Some of the structure is very likely due to pions. What is puzzling is that there are some events that definitely have energy in the first layer, but show no signal in the second.
Michel pointed out that it is likely that there are still out-of-time problems. Another problem could be is that the number of cells used to look at the electron shower could be too small to identify a pion shower nicely. He also recalled that for some past electron runs pion contamination sometimes hit the calorimeter at a slightly differennt place then do the electrons. Also, if the bending magnet is used, electrons can occasionaly radiate hard photons.

Margret mentioned that she completed a new geometry file that takes care of the cold HEC dimensions in z, but still uses the warm radial dimensions. Chris Oram is planning to measure the thermal expansion coefficient of the kapton boards. When that is done, a next version of the geometry file will be produced that will have the added columns of rho and drho for each cell.