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

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Presentation on theme: "Compton Kinematics studies and simulation results Paola Solevi 04/11/2009."— 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 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 * E 1 /E me ). Run 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 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 * E 1 /E me ). Run 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 * E 1 /E me ). Run Selection for different energy ranges.

9 Energy distribution Investigation of the reconstructed z coordinated for different energy ranges. Run z coordinate for 1 LYSO fired, in different energy ranges, using WLS in cluster selected by N cluster =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. Increasing energy

10 Efficiency study Investigation of the efficiency of the cluster selection criteria. Run Energy [keV] # events# clusters#cluster after selection 1 # cluster after selection 2 Ratio I/II

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

12 Run Cluster selection: amplitude [I] 30 adc cnts 40 adc cnts 50 adc cnts 60 adc cnts

13 Run Cluster selection: amplitude [II] 30 adc cnts 40 adc cnts 50 adc cnts 60 adc cnts Ratio bin to bin of cluster selected with and without a threshold applied.

14 Run Dependence on the WLS thr of the size of cluster in different energy ranges. Cluster selection: # wls 30 adc cnts 40 adc cnts 50 adc cnts 60 adc cnts

15 Run Dependence on the WLS thr of the number of cluster in different energy ranges. Cluster selection: # cluster 30 adc cnts 40 adc cnts 50 adc cnts 60 adc cnts

16 Run Study of cluster multiplicity 30 adc 40 adc 50 adc 60 adc 0 cluster 1 cluster 2 cluster

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 keV is a bit under-estimated.

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

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


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