GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 1 GLAST Large Area Telescope: TKR Efficiency Trending during EMI/EMC NRL Hiro Tajima (SLAC) Mutsumi Sugizaki (SLAC) TKR Gamma-ray Large Area Space Telescope GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 2 Analyzed runs Efficiency is trended for runs during EMI/EMC NRL. Run# range analyzed: Basic analysis is integrated with SVAC analysis and automatic. Only runs with duration > 1000 seconds are trended. Minimum necessary for efficiency calculation. Not intended to catch inefficiency due to EMI/EMC. Exercise efficiency trending. Summary of newly observed anomalies. Bay 3 Y6, Bay 5 X14, Bay 5 Y12, Bay 6 Y3, Bay 7 Y16, Bay 8 X11, Bay 8 X7 No new disconnected strips. Consistently lower efficiencies (24%) for all EMI runs. No plausible reason for inefficiencies. Bay 10, Y6: Noise flare Bay 15, X11: First evidence of the inefficiency on adjacent ladder by noise flare due to high rate of noise flare. Known anomalies. Bay 13, X13: Due to extremely hot strips. GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 3 Bay 3 (FM15) Y6 Almost all EMI/EMC runs affected. Known hot/dead strips 757, 758, 1338, 1339 Many more inefficient region for no reason. Further investigation. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 4 Bay 5 (FM1) X14 Known disconnected strips. Mysterious inefficiency this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 5 Bay 5 (FM1) Y12 Known disconnected strips this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 6 Bay 6 (FM12) Y3 No known bad strip. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 7 Bay 7 (FM13) Y16 No known bad strip. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 8 Bay 8 (FM5) X11 No known bad strip. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 9 Bay 8 (FM5) X7 No known bad strip. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 10 Bay 10 (FM7) Y6 Entire ladder shows ~10% inefficiency due to noise flare. No effect on adjacent ladder on the same GTRC. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 11 Bay 13 (FM4) X13 Inefficiency due to known new hot strips, 1141 and New mask xml files released to I&T about a month ago, but they have not been incorporated yet. Masking hot strips will not help if preamplifiers are saturated. this run reference GLAST LAT Project LAT Instrument Analysis Meeting June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 12 Bay 15 (FM11) X11 Known to flare. First evidence that noise flare affect efficiencies on adjacent ladder. this run reference