Attendance
V.Razmyslovich,O.Prokofiev, A.Bujak, B.Jensen, Y.Pishialinikov, G.Smith, R.Evans, N.Terentiev, S. Medved, G.Apollinari, T.Ferguson.

Agenda
Adam                          Status Report on P2' Cosmic Data Analysis.
 

Status Report on Cosmic Data Analysis.
Adam gave a quick report on the tension measurements on the 4th P3 panel and an extensive report on the work done by himself, Sergei and N.Terentiev on the analysis of the data taken in Lab 7 at the Cosmic Test stand.

• the wire tension on the 4th P3 panels are within specs (210 < Tension < 240 grams). A "bad"  (low tension) was found to be caught in the button at the center of the panel, and therefore unable to vibrate to allow a tension measurement.
• For the cosmic data out of P2', Adam presented a lot of information. He started with an online event display, clearly showing the 6 muon hits in the different planes. (The strips are read-out with the old gasplex electronics, while the muon position along the anode wires is determined by the trigger scintillators segmentation).  In a typical run of 12 h, we can collect 500K events. Adam expects that 5M events are needed for a check of the gas gain variation. 24 counters are placed above and below the chamber and define vertical slots of approximately 30 cm in length.
• Adam and Sergei spent a considerable amount of time calibration the gasplex electronics. Adam presented plots showing good linearity between the input calibration  and the output signals, while other channels (typically associated to a bad chip) presented much worse linearity. Adam identified 3 bad chips.
• The calibration data allowed Adam to study also the cross-talk, which is 23% in strip N+1 (closest neighbor), 5% in N+2,  ~0% in N+3 and slightly negative in strip N+4.  Sergei also pulsed the strips with high amplitude (~10 volts) to observe the cross-talk to strips far away from the pulsed strip (this test was performed to check the possibility for the test strip in the final chamber to pulse also the cathode electronics). A signal of the order of ~1/2 mips was observed on all the strips, suggesting that this possibility should be further studied.
• Adam confirmed that after this preliminary calibration he would concentrate on the measurement of the gas gain, to allow the finalization of the chamber design and check the performance of the new chamber buttons.