analysis of a g a t a coincidence line scan data
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Analysis of A G A T A coincidence line-scan data. M.Dimmock [email protected] Overview. Radial coincidence data. Effective segmentation issues. Filtering process - sidescan. Comparison of experimental and theoretical pulse-shapes. Analysis summary. Future scans.

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Presentation Transcript
slide2

Overview

  • Radial coincidence data
  • Effective segmentation issues
  • Filtering process - sidescan
  • Comparison of experimental and theoretical pulse-shapes
  • Analysis summary
  • Future scans
slide3

Experimental data

NaI energy (keV)

Ge core energy (keV)

  • 3 radial line-scans, 2mm spacing, 12 hours / position

30o

15o

0o

  • Gate on 374keV Ge and 288keV NaI energy
  • Gate on segment energy
  • Filter bad events
slide4

Signal noise

  • CWC converter box fault - FIXED for Cologne triple cluster experiment
  • Reduction in noise aides IC and real pulse parameterisation

1 event = 7.84keV (0.78mV)

<100 events> = 3.15keV (0.32mV)

  • pk2pk noise

1 event = 2.77keV (0.27mV)

<100 events> = 1.11keV (0.11mV)

  • RMS noise
slide6

Problem ! ! !

E6

E5

E4

E3

E2

E1

  • Gating on Ge and NaI energies, when each NaI covers multiple depths, does not work for complex segmentation
slide7

Filtering multiple depths

  • Gate on appropriate rise time distributions to split the pulses
  • Add back pulses with small chi-squared – future work !!!
  • Exp seg cross-over:
  • 0o = ~18mm
  • 15o = ~18mm
  • 30o = ~18mm
  • ~100 events in each super-pulse
  • MGS seg cross-over:
  • 0o = 16mm
  • 15o = 18mm
  • 30o = 18mm
slide8

Cs – 137 Side scan

  • Uniform 662keV energy response
  • Segment E3 double peaking
  • Warping of E-filed lines toward central anode

Core response

Core response, ring gated

100

90

80

70

60

50

40

30

20

10

0

0

10

20

slide9

Side scan Projection

  • 15.5mm collimation depth: E1 6-16mm, E2 18-34mm
  • Reduced effective E2 segment volume

~17mm

Segment energy gated response

E1

E2

E3

E4

E5

E6

slide10

6.0 mm

45.5 mm

28.5 mm

15.5 mm

Segment pulses

Centre contact pulses

slide11

Segment pulses

6.0 mm

45.5 mm

28.5 mm

15.5 mm

Centre contact pulses

slide12

15.5 mm

6.0 mm

slide13

Centre contact pulses

Segment pulses

45.5 mm

28.5 mm

slide17

Analysis Summary

  • Singles and coincidence data agrees well – offset expected due to multiple scattering
  • Improvements required for super-pulses with < 100 events – Generation of singles super-pulses to understand singles data close to the core
  • Superpulses are a promising method for initial parameterisation – This analysis is not possible in real-time PSA – NOISE reduction is crucial
slide18

MGS segment pulse shapes will agree well when the lattice orientation is corrected

  • Results are promising for the generation of a basis data set.
  • Move to 1mm diameter injection collimator – will help resolve ambiguities at segmentation boundaries
slide19

Future Measurements

  • Plan for 2006:
    • Coincidence scan each of the 3 symmetric detectors.
    • Compare results between Liverpool, Orsay and GSI scanning system results
  • Scan the first asymmetric detector.
  • All data to be distributed via Orsay.
changes to liverpool scanning system for 2006
Changes to Liverpool Scanning system for 2006:
  • Utilise 12cm long 1mm injection collimator.
  • First 3 z-depths 1.3mm/back 2.6mm
  • Unique scintillator ring for each depth
  • Change 11.1 MBq (70PP cps) @2mm 9cm [50/2]
    •  70.2MBq 137Cs (40PP cps) [20/1] or
    •  920MBq 137Cs (420PP cps) [200/10]
  • Will allow half of the detector to be scanned in coincidence.
  • Will perform 241Am side scan to determine segmentation boundaries.
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