Transcript ppt
TRD occupancy monitor status report from 29.01.2013 N.Nikonov Problem’s signatures • 3 types of signatures: – Gap in tracked hits distribution along the bad straw (Shape in bad straw is different from shape of others ) – Number of tracked hits in bad straw is less than average of hits number in module (Shape in bad straw is the same) Problem’s signatures • 3 types of signatures: – Number of missed hits in bad straw is much bigger than in others for a given module 3 Outline • • For now it’s known 9 bad staws: 324, 1438, 1439, 2145, 2575, 3296, 3297, 4800, 4831 The task is: develop online procedure to identify new BAD straws – First 2 signatures can be found use K-S tests of longitudinal straw hits distribution, compare to the • Longitudinal straw hits distribution for the rest of this module • Longitudinal straw hits distribution of the same straw in the beginning of the flight – The third signature requires alignment correction (disp ~ 1mm). The last data point for various allingments: – TrdKCalib 14 Dec 2012 – TrdSCalib 17 May 2012 No alignment available for ONLINE checks – TrdQt 9 Sep 2012 – TrdMTrack 9 Sep 2012 Rate [events/(straw * hour)] Event selection rate* for 1-min ROOT-files Straw ID * Evaluated use time of data acquisition (not live time). The goal is to estimate real time required to accumulate reasonable statistics per tube TRD Layer Event selection rate* for 1-min ROOT-files Spatial distribution && bad straws Straw position X/Y * Evaluated use time of data acquisition (not live time). The goal is to estimate real time required to accumulate reasonable statistics per tube Kolmogorov-Smirnov tests results TRD Layer Straw vs. 15 straws average hits profile comparison Only shape Straw position X/Y Kolmogorov-Smirnov tests results Straws number Straw vs. 15 straws average hits profile comparison Only shape K-S probability Kolmogorov-Smirnov tests results TRD Layer Straw vs. 15 straws average hits profile comparison Shape + normalization Straw position X/Y Kolmogorov-Smirnov tests results Straws number Straw vs. 15 straws average hits profile comparison Shape + normalization K-S probability