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Compton Kinematics studies and simulation results

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Presentation on theme: "Compton Kinematics studies and simulation results"— Presentation transcript:

1 Compton Kinematics studies and simulation results
Paola Solevi 04/11/2009

2 Energy distribution - Run 1665, HL on trigger turned off.
- Calibration with 1680 (ET) and 1681 (IT). 1 LYSO only selected. Small tagger guarantees low energy hit are focused at the centre of the module.

3 General cluster overview with no selection
pp+63 keV

4 Cluster selection: amplitude [I]
By requiring only 1 cluster on the same layer of the fired LYSO (1 LYSO selected). Run 01665 Selection for different energy ranges.

5 Cluster selection: amplitude [II]
By selecting all clusters whose amplitude is larger than a certain threshold (thres = 150 adc cnts * E1/Eme). Run 01665 Selection for different energy ranges.

6 Cluster selection: # wls [I]
By requiring only 1 cluster on the same layer of the fired LYSO (1 LYSO selected). Run 01665 Selection for different energy ranges.

7 Cluster selection: # wls [II]
By selecting all clusters whose amplitude is larger than a certain threshold (thres = 150 adc cnts * E1/Eme). Run 01665 Selection for different energy ranges.

8 Cluster selection: # cluster [I]
By selecting all clusters whose amplitude is larger than a certain threshold (thres = 150 adc cnts * E1/Eme). Run 01665 Selection for different energy ranges.

9 Energy distribution Investigation of the reconstructed z coordinated for different energy ranges. Increasing energy Run 01665 z coordinate for 1 LYSO fired, in different energy ranges, using WLS in cluster selected by Ncluster =1. The shown distribution are obtained by selecting events on layer 6. The larger is the energy, more WLS are fired and the reconstructed z gets continuous.

10 Efficiency study Investigation of the efficiency of the cluster selection criteria. Energy [keV] # events # clusters #cluster after selection 1 # cluster after selection 2 Ratio I/II 50-100 8843 1608 1590 1592 99.8 12195 6434 6274 5993 104.7 13911 11426 10846 9825 110.4 11221 10658 9679 9097 106.4 8544 8603 7392 7444 99.3 8606 8974 7218 7778 92.8 5281 5582 4069 4645 87.6 16924 20704 12802 16323 78.4 51285 65541 36870 49811 74.0 1657 2128 1008 1471 68.5 Run 01665

11 Studying WLS cluster for different WLS thresholds
Different thresholds have been applied at WLS level: (20), 30, 40, 50 and 60 adc counts. Run 01665 Dependence on the WLS thr of the number of events with no WLS fired.

12 Cluster selection: amplitude [I]
30 adc cnts adc cnts adc cnts adc cnts 50-100 Run 01665

13 Cluster selection: amplitude [II]
30 adc cnts adc cnts adc cnts adc cnts 50-100 Run 01665 Ratio bin to bin of cluster selected with and without a threshold applied.

14 Cluster selection: # wls
30 adc cnts adc cnts adc cnts adc cnts 50-100 Run 01665 Dependence on the WLS thr of the size of cluster in different energy ranges.

15 Cluster selection: # cluster
30 adc cnts adc cnts adc cnts adc cnts 50-100 Run 01665 Dependence on the WLS thr of the number of cluster in different energy ranges.

16 Study of cluster multiplicity
30 adc 40 adc 50 adc 60 adc Run 01665

17 “Cleaned up” simulation: LYSO (Lu = 72%) [1]
I cleaned the source code from all changes done and the agreement with data is eventually good! Now changes have to be re-implemented by comparing data and simulation step after step. Small shift due to the calibration. 63 keV is a bit under-estimated.

18 “Cleaned up” simulation: LYSO (Lu = 72%) [2]

19 Understanding the intrinsic radioactivity spectrum
Kα Υ1 Υ2-Kα Υ3-Kα Υ2 Υ3 Energy in LYSO with energy blurring: only 300, 200 and 63 keV peaks are visible.

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