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MAPD/MPPC Characterization & Axial PET

MAPD/MPPC Characterization & Axial PET. Dominik.Fehlker@ift.uib.no. 3.2.2009. 1. 1. Axial PET. Long, axial mounted crystals. Radial PET Axial PET. 3.2.2009. Dominik.Fehlker@ift.uib.no. 2. 1. Axial PET. 3.2.2009. Dominik.Fehlker@ift.uib.no. 3. 1. Axial PET.

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MAPD/MPPC Characterization & Axial PET

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  1. MAPD/MPPC Characterization & Axial PET Dominik.Fehlker@ift.uib.no 3.2.2009 1

  2. 1. Axial PET Long, axial mounted crystals Radial PET Axial PET 3.2.2009 Dominik.Fehlker@ift.uib.no 2

  3. 1. Axial PET 3.2.2009 Dominik.Fehlker@ift.uib.no 3

  4. 1. Axial PET Z-coordinate from Wavelength shifting fiber (WLS) strips Scintillation light not reflected in the crystal absorbed by WLS strip -> re-emitted as fluorescence light LYSO crystal and WLS strip readout by Hamamatsu MPPCs 3.2.2009 • http://wwweth.cern.ch/ecal-pictures/PET/PET%20GENERAL/index.htm Dominik.Fehlker@ift.uib.no 4

  5. 1. Axial PET Current status at Cern: Small setup Measurement of coated crystals … 3.2.2009 Dominik.Fehlker@ift.uib.no 5

  6. 1. Axial PET Advantages: Better spatial resolution Identification of Compton effects No parallax error Very good timing resolution 3.2.2009 Dominik.Fehlker@ift.uib.no 6

  7. 2. MAPD Characterisation Cell Same measurements as Hege Absolute gain Dark rate (Photon detection efficiency) Measurements done from dedicated program 3.2.2009 Dominik.Fehlker@ift.uib.no 7

  8. 2. MAPD Characterisation Cell Delay Amplifier Linux PC with measurement software Pulser generator to LED CAEN controller with ADC/QDC 3.2.2009 Dominik.Fehlker@ift.uib.no NIM discriminator 8

  9. 2. MAPD Characterisation Cell Amplifier Heating Elements and Temperature sensor Optical filters inside Cooling pipes LED 3.2.2009 Dominik.Fehlker@ift.uib.no 9

  10. 2. MAPD Characterisation Cell To be done: Temperature control about to be finished Measurement software to be installed 3.2.2009 Dominik.Fehlker@ift.uib.no 10

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