Transcript ppt
LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project GLAST Large Area Telescope: Gamma-ray Large Area Space Telescope TKR Efficiency Trending during EMI/EMC test @ NRL Hiro Tajima (SLAC) Mutsumi Sugizaki (SLAC) TKR [email protected] 650-926-3035 Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 1 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Analyzed runs • • • • Efficiency is trended for runs during EMI/EMC tests @ NRL. – Run# range analyzed: 77005895-770064200. – 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. Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 2 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project 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 Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 3 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 5 (FM1) X14 • Known disconnected strips. – 64 80 87 106 198 333 335 1443 • Mysterious inefficiency — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 4 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 5 (FM1) Y12 • Known disconnected strips – 540 702 703 772 774 775 777 800 818 887 894 — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 5 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 6 (FM12) Y3 • No known bad strip. — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 6 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 7 (FM13) Y16 • No known bad strip. — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 7 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 8 (FM5) X11 • No known bad strip. — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 8 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 8 (FM5) X7 • No known bad strip. — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 9 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project 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 Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 10 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 13 (FM4) X13 • Inefficiency due to known “new” hot strips, 1141 and 1143. • 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 Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 11 LAT Instrument Analysis Meeting – June 30, 2006 GLAST LAT Project Bay 15 (FM11) X11 • Known to flare. – First evidence that noise flare affect efficiencies on adjacent ladder. — this run — reference Hiro Tajima, TKR Efficiency Trending, EMI/EMC @ NRL 12