GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 1 Trending CAL performance and mapping crystals Gamma-ray Large Area.

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Presentation transcript:

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 1 Trending CAL performance and mapping crystals Gamma-ray Large Area Space Telescope Trending CAL performance parameters as a function of LAT assembly phase: –from Comprehensive Performance Tests –from calibration files (calibGenCal) Mapping CAL crystals and energy response Conclusions

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 2 Trending CAL performance parameters from CPT’s 1/10 What do we trend ? –Compute pedestals: we trend position and width –Check optical response (with muons): a test for changes in the PDA (photo-diode assembly) optical bond quality is made from the ratio of LE or HE diode signals we trend LE+/LE-, LE+/HE+ and LE-/HE- –Calibrate electronic gains (with CI): we trend the lowest and highest relative gains (w.r.t. nominal gains) these gains are chosen because any drift from the nominal value would be most greatly amplified –Determine front-end integral non-linearity and noise (with CI): we trend non-linearity (RMS deviation from linear fit in %) Which phases ? –8 first modules: 8T, 16T, 16T_fGASU, 16T_7Feb06 –8 last modules: 16T, 16T_fGASU, 16T_7Feb06 Except FM117 (data removed by FM116 data…)

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 3 Trending CAL performance parameters from CPT’s 2/10 T00-FM104T01-FM103

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 4 Trending CAL performance parameters from CPT’s 3/10 T03-FM118T04-FM105

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 5 Trending CAL performance parameters from CPT’s 4/10 T05-FM102T06-FM115

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 6 Trending CAL performance parameters from CPT’s 5/10 T07-FM116T08-FM107

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 7 Trending CAL performance parameters from CPT’s 6/10 T09-FM106T10-FM111

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 8 Trending CAL performance parameters from CPT’s 7/10 T11-FM112T12-FM110

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 9 Trending CAL performance parameters from CPT’s 8/10 T13-FM108T14-FM113

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 10 Trending CAL performance parameters from CPT’s 9/10 T15-FM114

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 11 Trending CAL performance parameters from CPT’s 10/10 T05-FM102 Largest variations seen for LE+/LE- (Cf IA workshop 5) columnrows 4 phases LE+/HE- LE+/LE- LE-/HE-

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 12 Trending CAL performance parameters from calibration files 1/5 What do we trend ? –Characterize asymmetry functions for small (S) and large (L) diodes: we trend Right-Left amplitude –Energy calibration: we trend the small and large diode MeV per DAC constant Which phases ? 8T, 16T –Only for the 8 first modules so far…

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 13 Trending CAL performance parameters from calibration files 2/5 T00-FM104T01-FM103

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 14 Trending CAL performance parameters from calibration files 3/5 T04-FM105T05-FM102

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 15 Trending CAL performance parameters from calibration files 4/5 T08-FM107T09-FM106

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 16 Trending CAL performance parameters from calibration files 5/5 T12-FM110T13-FM108

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 17 Mapping CAL crystals using TKR extrapolated tracks 1/5 Data set (Merit and Svac tuples, calib v1r0): – 2T : B2 + B10 + B13 = 20h, EM v3r3p0 – 6T : B2 + B10 + B13 = 20h, EM v3r3p0 – 8T : B2 + B10 + B13 = 20h, EM v3r3p1 –16T : B2 + B13 + B30 = 21h, EM v3r4p6 Select events (% is given for 2 towers) –TkrNumTracks==1 (~80%) –>6 hits above 2 MeV in at least one tower (~25%) Use TKR extrapolated tracks (Tkr1XYZDir) to define hits in crystals: –Top and bottom faces must be crossed (no edges, no glancing hits) –Compute vertical equivalent deposited energy through path-length correction

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 18 Mapping CAL crystals using TKR extrapolated tracks 2/5 Map of number of hits per binMap of mean energy per bin Divide each crystal in 9 (3mm) * 54 (6mm) bins

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 19 Mapping CAL crystals using TKR extrapolated tracks 3/ MeV 20 MeV Maps of number of hits per binMaps of mean energy per bin ?

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 20 Mapping CAL crystals using TKR extrapolated tracks 4/5 Map of number of hits per binMap of mean energy per bin

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 21 Mapping CAL crystals using TKR extrapolated tracks 5/5 Map of number of hits per binMap of mean energy per bin

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 22 Crystal longitudinal energy response profiles (T4L4 logs) 8 towers16 towers 12 MeV 14 MeV The shape of T4L4C9 energy response profile has changed between 8T and 16T phases, but no variation observed for LE+/LE- ratio and L-R asymmetry amplitude

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 23 Crystal longitudinal energy response profiles (T5L1 logs) 8 towers16 towers 12 MeV 14 MeV The shape of T5L1C9 energy response profile has changed between 8T and 16T phases, but no variation observed for LE+/LE- ratio and L-R asymmetry amplitude

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 24 Quantifying inhomogeneity amplitude 1/2 Fit longitudinal energy response profile with a constant:  2 –Actually fit residuals (not the same stat in all slices)

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 25 Quantifying inhomogeneity amplitude 2/2 Fit distribution of residuals with a gaussian function: expect  ~0 and  ~1 –Here residuals are computed over the 9*54 bins (no slices) Calibration pb ?

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 26 Quantifying inhomogeneity amplitude: results 22   T4L4C9 and T5L1C9

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 27 Annex: distributions of MPV’s 1/2 For each log, fit a simple Landau function –MPV’s slightly different from David’s ones since function shape is a bit different For each module, plot distribution of MPVs = ± 0.02 MeV

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 28 Annex: distributions of MPV’s 2/2 T4L4C9 and bad fit T5L1C9

GLAST LAT Project Instrument Analysis Workshop 6 – 06/02/27 F. Piron & E. Nuss (LPTA) 29 Trending and crystal mapping show that performances are stable –Performance trending: definition of some parameters has been improved (e.g. asymmetry amplitude) some variations observed in LE+/LE- ratio –Crystal mapping: shows flat or very flat energy maps 2 anomalies found (among 1536 logs…), being investigated To do: –Add FM117 to CPT trending –Add 8 last towers to calibGenCal trending –Write a note ! Conclusions