GLAST LAT Project LAT Instrument Analysis Meeting – June 30, 2006 Hiro Tajima, TKR Efficiency Trending, NRL 1 GLAST Large Area Telescope: TKR.

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Presentation transcript:

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 (2–4%) 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