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Time resolution for laser runs

Time resolution for laser runs. Y. Horii 25th Feb. 2012. After applying Arita-san’s sample-by-sample calibration. Threshold of photon selection at -250. No SumAbsWindow cut since checked channel seems not have bad window.

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Time resolution for laser runs

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  1. Time resolution for laser runs • Y. Horii • 25th Feb. 2012 After applying Arita-san’s sample-by-sample calibration. Threshold of photon selection at -250. No SumAbsWindow cut since checked channel seems not have bad window. Also, no Charge8 < -100 cut is applied (small amount of cross talks due to harder threshold, check done by seeing waveforms by EYES...).

  2. Resolution better for some specific FTSW (or threshold sample) region. • All laser runs in Exp. 8 and 9. • See only odd samples of first odd window (second window of four windows taken). • h1: corrected time for 3 < threshold sample < 59(threshold sample defined in each window, range in 0-63). • h2: corrected time for threshold sample = 17. • h3: corrected time for threshold sample = 7. • h4: corrected time vs FTSW.(h2 and h3 similar to distributions for FTSW slices). Resolution= (233 ± 5) psec Resolution= (177 ± 15) psec Resolution= (195 ± 18) psec

  3. Resolution better for ONE run. • Large laser run of Exp. 8, run 37. • See only odd samples of first odd window (second window of four windows taken). • h1: corrected time for 42 < FTSW < 48. • h2: corrected time for 42 < FTSW < 45. • h3: corrected time for 45 ≤ FTSW < 48. • h4: corrected time vs FTSW. Resolution= (185 ± 11) psec Resolution= (161 ± 17) psec Resolution= (186 ± 14) psec Check for one threshold sample cannot be done due to small statistics.

  4. Resolution better for ONE run (check for another run). • Large laser run of Exp. 9, run 36. • See only odd samples of first odd window (second window of four windows taken). • h1: corrected time for 42 < FTSW < 48. • h2: corrected time for 42 < FTSW < 45. • h3: corrected time for 45 ≤ FTSW < 48. • h4: corrected time vs FTSW. Resolution= (165 ± 13) psec Resolution= (212 ± 31) psec Resolution= (132 ± 12) psec Check for one threshold sample cannot be done due to small statistics.

  5. Significant resolution change depending on event number in one laser run NOT obtained so far (total time of DAQ of run ~ minutes). • Large laser run of Exp. 9, run 36. • See only odd samples of first odd window (second window of four windows taken). • h1: corrected time for 42 < FTSW < 48 (all events). • h2: corrected time for 42 < FTSW < 48 and 2000 < EventNumber < 10000. • h3: corrected time for 45 ≤ FTSW < 48 and 4000 < EventNumber < 8000. • h4: corrected time vs event number. Resolution= (165 ± 13) psec Resolution= (167 ± 16) psec Resolution= (191 ± 29) psec

  6. Calibrated time resolution • Exp. 8 (normal incident), 4000 < event ID < 8000. • Channel 9 of PMT 16. • Only odd samples analyzed. Preliminary Number of events Resolution = (123 ± 14) psec. Need further investigation. Need extension to all good channels. Corrected time [nsec]

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