Status of the Orsay scanning System AGATA week- Lyon 2010 Concept - - PowerPoint PPT Presentation

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status of the orsay scanning system
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Status of the Orsay scanning System AGATA week- Lyon 2010 Concept - - PowerPoint PPT Presentation

Aug 10, 2023 309 likes •479 views

Status of the Orsay scanning System AGATA week- Lyon 2010 Concept of the scanning set-up at Orsay Agata detector : movment Xy movment F e Tohr : z movment Coincidences : 6 NaI detectors 2r Positionning rods Focal point Digital

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SLIDE 1

Status of the Orsay scanning System

AGATA week- Lyon 2010

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SLIDE 2

Concept of the scanning set-up at Orsay

Digital electronics

Focal point 2r F e d d’ Positionning rods Tungten sheet Brace

  • 40 triangular–shaped 200 µ

µm thick W-plates

  • Plate separation : 200 µm
  • 200 µm diameter holes on a hexagonal lattice

Agata detector : θ movment Xy movment Tohr : z movment Coincidences : 6 NaI detectors Intense Source : 477 MBq Volume /scan point : 2 x 2 x 2- 3 mm3 : 3D Scan of the whole detector From simulations, the number of single interaction Compton scatter events at a given position : 400/h @front face, 100/h @front third and 10/h @the back of the detector

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SLIDE 3

Agata Diff TIGRESS PC DAQ 7 LVDs SMA-SMA Ethernet TIGRESS

  • 50 channels availale

(5 TIG10) + 1 collector card (TIG C)

 Flash ADC 14bits 100MHz

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SLIDE 4

Single data has been collected using a 1.6 mm collimator moving in a 2 and 1 mm steps with a 30 seconds time collection Data format :

NARVAL : One file/position > scan_x_y_z_θ.event

coincidence scannning for the same positions as Liverpool (line1)

October 2008: Scanning started ended : December 2008

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SLIDE 5

Single scan of S003

  • Source Cs137 477MBq  2kHz rate
  • 1mm step, 30s/position, 150 points/signal  1.5 µs/signal
  • Photopic intensity distrubution (662 keV)
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SLIDE 6

A4-F4 A5-F5 A6-F6 A3-F3 A2-F2 A1-F1

A1- F1 A2- F2 A3- F3

F4 B4 C4 D4 E4 A4

F4/D4 = 0.86 C4/D4 = 0.88

Photopic intensity / segment

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SLIDE 7

T30-center-contact-all rings

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SLIDE 8

T30-outer-contact

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SLIDE 9

T90-outer-all-rings

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SLIDE 10

T90-center-all-rings

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SLIDE 11

Image Charge Asymmetry

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SLIDE 12
  • 6 modules TOHR: 2 groups:

3NaI sont positionnés @ 79.8° 3NaI sont positionnés @ 100.2°

coïncidence scan results

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SLIDE 13

Agata (keV)

coïncidence matrices AGATA vs TOHR

@ 100°

TOHR

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SLIDE 14

Coïncidence signals

Front face (position: 1, 30, 7.3) mm 1.5 h Back face (position: 1, 30, 75.5) mm 6 h

AGATA- TOHR@ 80° AGATA- TOHR@ 100° AGATA- TOHR@ 100° AGATA- TOHR@ 80°

230 traces/h 7 traces/h

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SLIDE 15

Commissioning ok

  • S003 received Oct 2008  DAQ: TIGRESS + Narval
  • Results:
  • Single scan (2 times: 2mm & 1mm steps)

1 week is required for a full single scan

  • Scan in coïncidence: Line 1 ok