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TITLE. INVESTIGATION OF DIAMOND SAMPLES UNDER HIGH DOSES OF ELECTROMAGNETIC IRRADIATION (at S-DALINAC) Wolfgang Lange, DESY Zeuthen. 1. 3rd NoRDHia Workshop @. OUTLINE OF THIS TALK. Motivation Test Beam @ S-DALINAC Measurements Layout and method Simulations, geometry Samples Analysis

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  1. TITLE INVESTIGATION OF DIAMOND SAMPLES UNDER HIGH DOSES OF ELECTROMAGNETIC IRRADIATION (at S-DALINAC) Wolfgang Lange, DESY Zeuthen 1 3rd NoRDHia Workshop @

  2. OUTLINE OF THIS TALK • Motivation • Test Beam @ S-DALINAC • Measurements • Layout and method • Simulations, geometry • Samples • Analysis • Results (preliminary) • Conclusions 2 3rd NoRDHia Workshop @ Wolfgang Lange

  3. MOTIVATION FOR RADHARD SENSORS BeamCal 30 layers of W / CVD diamond (?) 5 < ANGLE < 28 mrad Energy deposition from beamstrahlung pairs in BeamCal: Dose of up to 10 MGy/a 3 3rd NoRDHia Workshop @ Wolfgang Lange

  4. MOTIVATION - ENERGIES AND DOSES Simulated situation in BeamCal: Energy spectrum of particles depositing energy in the sensors • Spectrum given for 2X0 : • similar for all planes • peaks @ 10 MeV • --> use 10 MeV electrons (secondaries…) • --> doses of > 1 MGy 4 3rd NoRDHia Workshop @ Wolfgang Lange

  5. TEST BEAM @ S-DALINAC Superconducting DArmstadt LINear ACcelerator Institut für Kernphysik, TU Darmstadt Using the injector line of the S-DALINAC: 10 ± 0.015 MeV and possible beam currents from 1nA to 50µA 5 3rd NoRDHia Workshop @ Wolfgang Lange

  6. LAYOUT AND METHOD (1) Irradiation … spectroscopic measurement … ->use of 2 setups: a) beam area b) “CCD measurement” 6 3rd NoRDHia Workshop @ Wolfgang Lange

  7. Sensor box (IDia, TDia, HV) LAYOUT AND METHOD (2) Beam area: Beam exit window Collimator (IColl) Faraday cup (IFC , TFC) 7 3rd NoRDHia Workshop @ Wolfgang Lange

  8. LAYOUT AND METHOD (3) CCD measurement: Source (Sr 90) collimator Sensor box preamp Trigger box 8 3rd NoRDHia Workshop @ Wolfgang Lange

  9. Given: SIMULATION AND GEOMETRY (1) 9 3rd NoRDHia Workshop @ Wolfgang Lange

  10. SIMULATION AND GEOMETRY (2) • Optimizing of • Distances • dimensions Beam exit -> collimator -> sensor -> faraday cup 10 3rd NoRDHia Workshop @ Wolfgang Lange

  11. Beam exit foil collimator SIMULATION AND GEOMETRY (3) sensor Distance = 290 mm faraday cup 11 3rd NoRDHia Workshop @ Wolfgang Lange Beam exit -> collimator -> sensor -> faraday cup

  12. Optimized: • - Distance • collimator, ratio R Beam exit foil SIMULATION AND GEOMETRY (4) faraday cup collimator sensor Statistics (extract R = (NFC/NSensor ) = 0.98) Energy deposition Spatial distribution 12 3rd NoRDHia Workshop @ Wolfgang Lange

  13. Investigate: • 2 samples from E6 (pCVD) • 1 MGy • 5 MGy • 2 samples from IAF Freiburg • 1 MGy (pCVD) • 5 MGy • 2 Si samples (Micron Ltd. UK) • both drew high currents after ~50 kGy. SENSOR SAMPLES E6_4p after ~5 MGy 13 3rd NoRDHia Workshop @ Wolfgang Lange

  14. Tuned the beam to currents in the Faraday cup of: • 10, 20, 50 and 100 nA • This corresponds to dose rates of: • 59, 118, 295 and 590 kGy/h • Dose controlled by beam current • Error assumed ~ 10% MEASUREMENTS IN TESTBEAM (1) 14 3rd NoRDHia Workshop @ Wolfgang Lange

  15. MEASUREMENTS IN TESTBEAM (2) 140 µm @ 400V 110 µm @ 400V Before Irradiation (pumping?) after irradiation 15 3rd NoRDHia Workshop @ Wolfgang Lange

  16. MEASUREMENTS IN TESTBEAM (3) 95 µm @ 400V 130 µm @ 400V Before Irradiation after irradiation 16 3rd NoRDHia Workshop @ Wolfgang Lange

  17. MEASUREMENTS IN TESTBEAM (4) 110 µm @ 400V 18 µm @ 400V Before Irradiation after irradiation 17 3rd NoRDHia Workshop @ Wolfgang Lange

  18. MEASUREMENTS IN TESTBEAM (5) 88 µm @ 400V 23 µm @ 400V after irradiation Before Irradiation 18 3rd NoRDHia Workshop @ Wolfgang Lange

  19. MEASUREMENTS IN TESTBEAM (6) Thickness = 280 µm Initial CCD = 280 µm (100% collection efficiency) 19 3rd NoRDHia Workshop @ Wolfgang Lange

  20. S-DALINAC is well suitable facility up to 10 MeV: • wide range of intensities possible (1 nA to 50 µA) • good experimental support, helpful crew • More measurements planned • Completely different behaviour of different samples: • nearly stable vs. dose, recovers behaviour (E6_B2) • degrading vs. (much higher: ~ 4*) dose, recovers with lower CCD (E6_4p) • improves CCD vs. dose, stays with larger CCD (DESY-8, FAP-5, both Fraunhofer) • Further investigations needed • Standard silicon stable only until ~ 50 kGy, damage after irradiation permanent CONCLUSIONS 20 3rd NoRDHia Workshop @ Wolfgang Lange

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