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AGATA Characterisation Group Report. First symmetric prototype detector scanned in singles & coincidence. Report produced and data circulated Available from Liverpool (MTsort EG format) Orsay (Root tree) MGS E-field report produced Comparison of experimental/theoretical data.

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agata characterisation group report
AGATA Characterisation Group Report
  • First symmetric prototype detector scanned in singles & coincidence.
  • Report produced and data circulated
    • Available from Liverpool (MTsort EG format)
    • Orsay (Root tree)
  • MGS E-field report produced
    • Comparison of experimental/theoretical data.
  • Reports produced on radial/azimuthal response.
  • All information is available from:
  • http://ns.ph.liv.ac.uk/AGATA
experimental set up at liverpool

NaI Energy

Region of Interest

288 keV

374 keV

Ge Energy

Experimental Set Up at Liverpool

NaI AND Ge detector in coincidence to ascertain 3-D position information

Ensures that only -rays scattering through an angle of 900 are recorded

=> accurate 3D position

11.1MBq137Cs (662keV) source scanned across front face of detector through 2mm injection collimator (70PP cps)

slide3

T90 Polar Plots

Outer Contact

Central Contact

Core and segment energy gate 640->677keV

Counts threshold >300 in the segment

Core energy gate 640->677keV

Counts threshold >1600 in the ring

slide4

T30 Polar Plots

Outer Contact

Central Contact

Core and segment energy gate 640->677keV

Counts threshold >300 in the segment

Core energy gate 640->677keV

Counts threshold >1600 in the ring

slide5

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
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
slide8

Segment pulses

Centre contact pulses

6.0 mm

45.5 mm

28.5 mm

15.5 mm

electric field simulations mgs

I

Geometry

II

Potential

Elec field

III

Drift velocities

IV

Weighting fields

AGATA symmetric crystal simulation

Electric Field Simulations : MGS
  • Electric field simulations have been performed and details comparisons have been made with experimental pulse shape data.
slide10

Segment pulses

Centre contact pulses

6.0 mm

45.5 mm

28.5 mm

15.5 mm

mgs updates since february 1
MGS updates since february (1)
  • MGS is still improving
    • Hole mobility model by B. Bruyneel (IKP Cologne)
    • Optional neutron damage simulation
    • New implementation of Ramo theorem (in progress)
  • Pulse computation
    • Batch mode more stable
    • Speed optimisation (in batch mode and GUI mode)
mgs updates since february 2
MGS updates since february (2)
  • About MGS supported platforms
    • Executable and source for Windows
    • Source for Linux: you can compile it on the Linux distribution of your choice
  • New web site :
    • MGS source and news: http://mgs2005.in2p3.fr/Mgs.php
    • Workshop MGS2005 site: http://mgs2005.in2p3.fr/
  • Send your remarks, report the bugs to:
slide13

MGS Simulation Results

Z=14mm

Z=8->21mm

slide14

45.5 mm

28.5 mm

slide15

Transient Magnitudes

FEE in Segment 5

Z = 6mm

FEE in Segment 11

Z = 15.5mm

FEE in Segment 17

Z = 28.5mm

slide16

Outer Contact Risetimes – 2nd depth

Beam Spot Diameter:

3.3mm

Z = 15.5mm

T90

agata characterisation group future work
AGATA Characterisation group Future Work
  • 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.
gsi scanning concept
GSI scanning Concept

Side detector

  • Reduce a time to scan by taking data for all required positions at same time
  • Define directions of g-ray by measuring one of 511 keV g-rays from a 22Na source
  • Define interaction position in Ge by measuring a scattering g-ray on the side detector and energy deposit in Ge.

511g

Ge

Collimator

(slits)

511g

Collimator

(holes)

22Na

g source

Scinti. Fiber

agata characterisation group team meeting
AGATA Characterisation group Team Meeting
  • Team meeting today at 5.00pm:
  • Laura Nelson “AGATA coincidence data analysis”
  • Matt Dimmock “Radial responses and effective segmentation”
  • Bart Burnell “12 Fold Miniball detector”
  • Karl Hauschild “Status of the Orsay scanning system”
  • Juergen Gerl “Status of the GSI scanning system”
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