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ECAL Testbeam Meeting, Rome 28 March 2007 Toyoko Orimoto Adolf Bornheim, Chris Rogan, Yong Yang California Institute of Technology Lastest Results from.

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Presentation on theme: "ECAL Testbeam Meeting, Rome 28 March 2007 Toyoko Orimoto Adolf Bornheim, Chris Rogan, Yong Yang California Institute of Technology Lastest Results from."— Presentation transcript:

1 ECAL Testbeam Meeting, Rome 28 March 2007 Toyoko Orimoto Adolf Bornheim, Chris Rogan, Yong Yang California Institute of Technology Lastest Results from Laser Monitoring Irradiation Studies at H4 2006

2 28 March 2007 T. Orimoto - Irradiation Studies at H4 2 Outline  Overview of Irradiation Runs at H4  Transparency correction studies  Dividing single crystal into 5x5  Possibility of looking at irradiated neighbors  Summary

3 28 March 2007 T. Orimoto - Irradiation Studies at H4 3 Irradiation runs at H4 2006 PeriodCommentsXtalHours Energ y Rate (S6, S2) Sept  Normal SPS cycle length 168~1212012k, 6k Nov: 04.- 06.11.  Limited maximum rate available due to SPS problems and H2 priority, 40s SPS cycle.  Nicolo suggested running at 90 GeV which yields highest rates at H4.  Global timing offset by 1 clock cycle  only 2 samples after the maximum. Corrected for the laser after 35 hours of running. 148~159012k, 6k 552~129012k, 6k 672~69030k, 13k 128~109030k, 13k Nov: 12.11  High rates available, 40 s SPS cycle  Additional timing problems (SPS clock synchronization lost). 88~129060k,

4 28 March 2007 T. Orimoto - Irradiation Studies at H4 4 Irradiation SM22 XTAL168  Irradiation at the end of the (second) beam period for SM22.  Rate : ~12k on S6 ~6k on S2 @ 120 GeV  Significant drop in APD/PN for 168. Some drop in 167, all other neighbors no obvious change. Note : Correlated fluctuations in neighboring channels

5 28 March 2007 T. Orimoto - Irradiation Studies at H4 5 November Irradiation SM06 Xtal 148 Maximum dose rate limited because of SPS problems and priority to H2 for  0 running. Irradiation of xtal 148 with ~12k on S6, ~6k on S2 @ 90 GeV (rate maximum for H4)  Very small change on xtal 148 (~0.25%) under direct irradiation.  Neighboring xtals show up to ~1%. Note : Xtals 16* are also in the area of linearity scan. APD/APD_ref Linearity scan ?

6 28 March 2007 T. Orimoto - Irradiation Studies at H4 6 November Irradiation SM06 Xtal 552 Irradiation of xtal 552 with ~12k on S6, ~6k on S2 @ 90 GeV  Xtal 552 shows even less change (~0.6%), and all its neighbors even less.  Note : Choice of reference APD not optimal  More noise. APD/APD_ref

7 28 March 2007 T. Orimoto - Irradiation Studies at H4 7 November Irradiation SM06 Xtal 672 Irradiation of xtal 672 with ~30k on S6, ~13k on S2 @ 90 GeV (improved SPS performance)  Xtal 672 shows even less change (~0.1%), two neighbors show significantly more.  All other neighbors show no change  Note : Choice of reference APD optimal  Very little noise. APD/APD_ref

8 28 March 2007 T. Orimoto - Irradiation Studies at H4 8 November Irradiation SM06 Xtals 128 & 88 Irradiation of xtal 128 with ~30k on S6, ~13k on S2 @ 90 GeV Noticed ‘softness’ of xtal 128 in initial irradiation of xtal148  Irradiate it.  Noticed ‘softness’ of xtal 108  Next irradiation should be 88. APD/APD_ref

9 28 March 2007 T. Orimoto - Irradiation Studies at H4 9 Irradiation - Xtal 168 Hodoscope hits - entire irradiation period of ~12 hours  Beam events distributed throughout crystal  Sufficient statistics to explore variations in electron response within crystal C. Rogan

10 28 March 2007 T. Orimoto - Irradiation Studies at H4 10 Irradiation - Xtal 168 Hodoscope hits - entire irradiation period  Reconstruct electron data for 25 different bins  Generate R-plot for each bin C. Rogan

11 28 March 2007 T. Orimoto - Irradiation Studies at H4 11 Irradiation - Xtal 168 Example energy distribution for R-plot point (central bin)  Each point in R-plot is derived from an energy distribution corresponding to a continuous time interval  Peak is fit and value is extracted (and error)  Bins further from center suffer from less statistics in given time interval  More difficult to resolve electron response Bin centered at -8, -4 (mm)  ~.89%  ~ 1.1% C. Rogan

12 28 March 2007 T. Orimoto - Irradiation Studies at H4 12 Irradiation - Xtal 168  For each time interval an interpolated laser response is calculated R computed with normalized laser and electron responses C. Rogan

13 28 March 2007 T. Orimoto - Irradiation Studies at H4 13 Irradiation - Xtal 168 C. Rogan

14 28 March 2007 T. Orimoto - Irradiation Studies at H4 14 Irradiation - Xtal 168 (5x5) C. Rogan -0.30 ± 0.05 1.47 ± 0.02 1.53 ± 0.03 0.93 ± 0.03 1.26 ± 0.05 1.38 ± 0.02 1.64 ± 0.01 1.48 ± 0.01 1.490± 0.01 1.29 ± 0.02 1.53 ± 0.01 1.38 ± 0.01 1.37 ± 0.01 1.47 ± 0.01 1.18 ± 0.02 1.37 ± 0.01 1.40 ± 0.01 1.39 ± 0.01 1.46 ± 0.01 1.36 ± 0.02 1.44 ± 0.03 1.38 ± 0.02 1.41 ± 0.02 1.17 ± 0.02 1.17 ± 0.05 Mean = 1.373 RMS = 0.1468 Central bin fit for R

15 28 March 2007 T. Orimoto - Irradiation Studies at H4 15 Irradiation - Xtal 168 Alpha values used to correct electron response Uncorrected E9Corrected E9  ~ 1.2%  ~.53% No intercalibration constants used Surrounding crystals uncorrected C. Rogan

16 28 March 2007 T. Orimoto - Irradiation Studies at H4 16 Irradiation - Xtal 128 (5x5) C. Rogan 6.28 ± 0.23 4.71 ± 0.16 -1.21 ± 0.10 -0.35 ± 0.12 1.63 ± 0.17 1.91 ± 0.08 1.92 ± 0.06 1.73 ± 0.05 1.42 ± 0.05 4.42 ± 0.15 1.74 ± 0.05 1.91 ± 0.04 1.55 ± 0.03 1.43 ± 0.04 1.49 ± 0.01 1.71 ± 0.05 1.61 ± 0.03 1.59 ± 0.03 1.96 ± 0.04 0.38 ± 0.07 1.77 ± 0.07 1.73 ± 0.06 2.54 ± 0.06 2.01 ± 0.06 1.20 ± 0.11 Mean = 1.73 RMS = 0.28 Central bin fit for R

17 28 March 2007 T. Orimoto - Irradiation Studies at H4 17 Irradiation - Xtal 148 (5x5) C. Rogan 130.6 ± 33.1 42.4 ± 19.6 -7.4 ± 1.7 14.4 ± 6.0 26.1 ± 6.5 9.8 ± 1.3 1.9 ± 0.3 6.3 ± 0.8 39.8 ± 17.4 18.4 ± 7.0 4.1 ± 0.5 2.8 ± 0.3 4.2 ± 0.4 6.2 ± 0.7 13.0 ± 1.6 4.1 ± 0.5 3.2 ± 0.3 3.9 ± 0.4 14.7 ± 1.7 5.8 ± 0.8 6.5 ± 0.8 2.5 ± 0.4 4.7 ± 0.6 102.7 ± 26.6 Mean = 4.671 RMS = 1.933 Central bin fit for R

18 28 March 2007 T. Orimoto - Irradiation Studies at H4 18 Irradiation - Xtal 552 (5x5) C. Rogan Mean = 1.431 RMS = 0.437 Central bin fit for R 9.59 ± 0.41 1.09 ± 0.14 1.85 ± - 0.15 -1.22 ± 0.18 1.71 ± 0.24 2.36 ± 0.12 1.12 ± 0.06 1.02± 0.06 1.82 ± 0.08 4.55 ± 0.21 0.68 ± 0.08 1.76 ± 0.05 1.50 ± 0.04 1.41 ± 0.05 3.54 ± 0.15 1.39 ± 0.08 1.47 ± 0.04 1.48 ± 0.05 1.55 ± 0.06 3.29 ± 0.15 0.40 ± 0.14 1.20 ± 0.09 1.59 ± 0.09 1.80 ± 0.10 6.22 ± 0.29

19 28 March 2007 T. Orimoto - Irradiation Studies at H4 19 Irradiation - Xtal 672 (5x5) C. Rogan 28.4 ± 8.4 23.1 ± 6.2 6.8 ± 1.8 26.2 ± 8.8 24.6 ± 8.0 6.3 ± 1.3 4.3 ± 0.8 3.1 ± 0.8 5.0 ± 0.9 14.4 ± 3.4 - ± - 4.0 ± 0.7 2.9 ± 0.5 2.4 ± 0.5 24.5 ± 6.8 5.4 ± 1.2 2.2 ± 0.4 4.2 ± 0.7 4.3 ± 0.8 4.6 ± 1.2 -10.4 ± 2.8 4.6 ± 0.9 4.4 ± 1.0 11.8 ± 2.9 36.0 ± 8.9 Mean = 4.295 RMS = 1.274 Central bin fit for R

20 28 March 2007 T. Orimoto - Irradiation Studies at H4 20 Irradiation - neighboring crystals Studying possibility of extracting R-values from neighboring crystals using hits in those crystals… However, much lower statistics Example hodoscope profile for run (Xtal 128) Possible by examining shower response in neighbors from central xtal hits? C. Rogan

21 28 March 2007 T. Orimoto - Irradiation Studies at H4 21 Conclusion  6 crystals have been irradiated for extended periods at H4 TB in 2006, most with limited rate.  3 out of 6 crystals (168, 128, 552) showed clear transparency change. 2 showed little and one almost no change. (148, 672)  Several neighbor crystals showed clear transparency change. We are studying how to extract R values from that.  Transparency corrections and performance after transparency corrections are under study.  Begin estimating the systematic uncertainties of the transparency correction.  Some limited studies on other aspects of the crystals can be studies, eg. recovery times, radiation hardness, etc.  We strongly recommend more irradiation studies, perhaps during testbeam for endcaps

22 28 March 2007 T. Orimoto - Irradiation Studies at H4 22 Back up Slides

23 28 March 2007 T. Orimoto - Irradiation Studies at H4 23 Irradiation Runs at H4  September Irradiation :  Xtal 168 of SM22: ~12 hours, rates ~12k on S6, ~6k on S2 @ 120 GeV, normal SPS cycle length  November Irradiation : Many issues due to problems with timing 04.-06.11. : Limited maximum rate available due to SPS problems and H2 priority, 40s SPS cycle. Nicolo suggested running at 90 GeV which yields highest rates at H4. Global timing offset by 1 clock cycle  only 2 samples after the maximum. Corrected for the laser after 35 hours of running.  Xtal 148 on SM06 : ~15 hours, ~12k on S6, ~6k on S2  Xtal 552 on SM06 : ~12 hours, ~12k on S6, ~6k on S2, beam unstable  Xtal 672 on SM06 : ~6 hours, ~30k on S6, ~13k on S2  Xtal 128 on SM06 : ~10 hours, ~30k on S6, ~13k on S2 12.11. : High rates available, 40s SPS cycle, 90 GeV, additional timing problems in H4 (SPS clock synchronization lost).  Xtal 88 on SM06 : ~12 hours, ~60k on S6 Next slides : Lots of Scatter plots !

24 28 March 2007 T. Orimoto - Irradiation Studies at H4 24 APD/APD_ref vs APD/PN Effect is small on the first period of the November data, larger later after clock synchronisation loss. During long term follow up there might also be other incidents (eg. cooling interlock at ~3925 hours). APD/APD_ref APD/PN APD/APD_ref APD/PN

25 28 March 2007 T. Orimoto - Irradiation Studies at H4 25 November Irradiation  More soft neighbors in the area of xtals 148, 128 and 88.  Note : Odd behavior of xtal 87 before irradiation. APD/APD_ref Xtal 87

26 28 March 2007 T. Orimoto - Irradiation Studies at H4 26 Transparency Change Correction – Xtal 168 Correction R computed using 1x1 electron response

27 28 March 2007 T. Orimoto - Irradiation Studies at H4 27 Resolution after correction: SM22 168 SMCrystalRRes beforeRes after 221681.41 ± 0.010.93% 0.53%

28 28 March 2007 T. Orimoto - Irradiation Studies at H4 28 Transparency Change Correction – Xtal 552

29 28 March 2007 T. Orimoto - Irradiation Studies at H4 29 Resolution after correction: SM06 552 SMCrystalRRes beforeRes after 065521.54 ± 0.050.82% 0.77%

30 28 March 2007 T. Orimoto - Irradiation Studies at H4 30 Transparency Change Correction – Xtal 672

31 28 March 2007 T. Orimoto - Irradiation Studies at H4 31 Resolution after correction: SM06 672 SMCrystalRRes beforeRes after 066720.99 ± 0.080.69% 0.67%

32 28 March 2007 T. Orimoto - Irradiation Studies at H4 32 Transparency Change Correction – Xtal 128

33 28 March 2007 T. Orimoto - Irradiation Studies at H4 33 Resolution after correction: SM06 128 SMCrystalRRes beforeRes after 061281.82 ± 0.040.83% 0.68%

34 28 March 2007 T. Orimoto - Irradiation Studies at H4 34 R values from 5x5 of 168 and 128 168 Mean = 1.373 RMS = 0.1468 128 Mean = 1.73 RMS = 0.2806

35 28 March 2007 T. Orimoto - Irradiation Studies at H4 35 Irradiation - Xtal 168 (center) Relative electron response Relative Laser Response C. Rogan

36 28 March 2007 T. Orimoto - Irradiation Studies at H4 36 Irradiation - Xtal 168 (5x5) C. Rogan -0.30 ± 0.05 1.47 ± 0.02 1.53 ± 0.03 0.93 ± 0.03 1.26 ± 0.05 1.38 ± 0.02 1.64 ± 0.01 1.48 ± 0.01 1.490± 0.01 1.29 ± 0.02 1.53 ± 0.01 1.38 ± 0.01 1.37 ± 0.01 1.47 ± 0.01 1.18 ± 0.02 1.37 ± 0.01 1.40 ± 0.01 1.39 ± 0.01 1.46 ± 0.01 1.36 ± 0.02 1.44 ± 0.03 1.38 ± 0.02 1.41 ± 0.02 1.17 ± 0.02 1.17 ± 0.05 Mean = 1.373 RMS = 0.1468

37 28 March 2007 T. Orimoto - Irradiation Studies at H4 37 Irradiation - Xtal 128 Alpha values used to correct electron response Corrected E9  ~.67% No intercalibration constants used Surrounding crystals uncorrected Uncorrected E9  ~.82% C. Rogan

38 28 March 2007 T. Orimoto - Irradiation Studies at H4 38 Irradiation - Xtal 128 (5x5) C. Rogan 6.28 ± 0.23 4.71 ± 0.16 -1.21 ± 0.10 -0.35 ± 0.12 1.63 ± 0.17 1.91 ± 0.08 1.92 ± 0.06 1.73 ± 0.05 1.42 ± 0.05 4.42 ± 0.15 1.74 ± 0.05 1.91 ± 0.04 1.55 ± 0.03 1.43 ± 0.04 1.49 ± 0.01 1.71 ± 0.05 1.61 ± 0.03 1.59 ± 0.03 1.96 ± 0.04 0.38 ± 0.07 1.77 ± 0.07 1.73 ± 0.06 2.54 ± 0.06 2.01 ± 0.06 1.20 ± 0.11 Mean = 1.73 RMS = 0.28

39 28 March 2007 T. Orimoto - Irradiation Studies at H4 39 Irradiation - Xtal 128 (center) Relative Laser Response C. Rogan Relative electron response

40 28 March 2007 T. Orimoto - Irradiation Studies at H4 40 signal from Laser signal from Beam (e - ) a a slope :  = 1.55 Dispersion of  for 28 BTCP crystals  Coefficient for crystals have relatively small dispersion.  mean  5% on a ~5% correction due to the effect of irradiation  mean  5% on a ~5% correction due to the effect of irradiation  At startup use same parameters for all crystals from one producer. An in-situ determination of  is under consideration. 2002 2003 2004 (fall) (spring)  # Crystals Laser Light Loss – Electron Signal Loss

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