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New CCE and E-TCT measurements in Ljubljana

New CCE and E-TCT measurements in Ljubljana . Setups: CCE: Alibava readout system, Kazu.ini settings Keithley 2410 HV unit 90 Sr source only detector cooled with Peltier element, not the readout chip More details in: https://indico.cern.ch/event/292247/

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New CCE and E-TCT measurements in Ljubljana

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  1. New CCE and E-TCT measurements in Ljubljana • Setups: • CCE: • Alibava readout system, Kazu.ini settings • Keithley 2410 HV unit • 90Sr source • only detector cooled with Peltier element, not the readout chip • More details in: https://indico.cern.ch/event/292247/ • E-TCT measurement system: • G. Kramberger, et al.,IEEE Trans. Nucl. Sci. NS-57 (2010) 2294. • G. Kramberger et al., PoS - Proceedings of Science (Vertex 2013) 022 • New measurements: • CCE and E-TCT measurements with A12 mini detectors irradiated with • 23 MeV protons in Karlsruhe to 5e14 and 1e15 neq/cm2 • E-TCT measurement with A12 irradiated with neutrons to 1e15 and 2e15 Igor Mandić, Jožef Stefan Institute, 24 June 2014

  2. Neutron irradiation,Edge-TCT, A07 – A12 comparisson Velocity profile • induced current at t ~ 0 proportional to carrier velocity at laser beam location • if E not too large, I proportional to E( Ew~ constant (see:G. Kramberger, et al.,IEEE Trans. Nucl. Sci. NS-57 (2010) 2294.) • plots normalized to same integral from 0-300 µm (because ∫ Edx = Bias) 5e14 • in A07 significant field at the back side of the detector (near y = 300 um) •  difference could be explained by different initial doping concentrations Plot shown at AUW in Freiburg: https://indico.cern.ch/event/312262/contribution/8/material/slides/1.pdf Igor Mandić, Jožef Stefan Institute, 24 June 2014

  3. Neutron irradiation, Edge-TCT, A07 – A12 comparission Measurements after higher neutron fluences: 2e15, annealed 1e15, annealed • no significant difference between A12 and A07 at these fluences •  difference in initial resistivity not seen any more at high fluence Igor Mandić, Jožef Stefan Institute, 24 June 2014

  4. Hamburg model, annealing 80 minutes at 60C, parameters: taken from V. Cindro et al. NIM 599 (2009) 60-65. • Neff,0 smaller in A07 •  differencebetween A07 ane A12 getssmallerwithincreasingfluence Igor Mandić, Jožef Stefan Institute, 24 June 2014

  5. A12 detectorsirradiatedwith 23 MeV protons in Karlsruhe • at intermediate voltages and after annealing larger charge than after neutrons • after annealing agreement with Birmingham protons at Φ =1e15 Igor Mandić, Jožef Stefan Institute, 24 June 2014

  6. Annealing, 23 MeV protons • with detectors irradiated with 23 MeV protons charge • was measured after 10, 20, 40 and 80 min at 60 C • 1e15 at 500 V bias •  almost 50 % increase of MPV Protonsvs. neutrons • more annealing at low voltages after • 23 MeV protons than after neutrons Igor Mandić, Jožef Stefan Institute, 24 June 2014

  7. Chargevs. fluence at 500 V and 900 V forprotonsandneutrons. A12 detectorsmeasured in Ljubljana Annealed 80 minutes larger charge after protons than after neutrons at 500 V Igor Mandić, Jožef Stefan Institute, 24 June 2014

  8. Edge-TCT withdetectorsirradiated in Karlsruhe • larger active volume after irradiation with 23 MeV protons than after neutrons at 500 V •  consistent with larger charge measured with Alibava Igor Mandić, Jožef Stefan Institute, 24 June 2014

  9. Conclusions • Edge-TCT measurements with A12 and A07 detectors after 1e15 and 2e15 neutrons •  no difference between A12 and A07 observed in velocity profiles • the difference seen at lower fluences due to different initial doping concentration • A12 detectors irradiated with 23 MeV neutrons in Karlsruhe to 5e14 and 1e15 •  significant beneficial annealing observed at ~ 500 V bias (up to 50% at 1e15) •  after annealing good agreement with Birmingham protons •  larger CCE after 23 MeV protons then after neutrons at ~ 500 V bias •  difference between protons and neutrons seen also with Edge-TCT • Future work: • A12 detectors were irradiated with pions at PSI • compare CCE with neutrons and 23 MeV protons Igor Mandić, Jožef Stefan Institute, 24 June 2014

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