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Studies of radiation effects on graphite collimator materials

Studies of radiation effects on graphite collimator materials A.I.Ryazanov * , A.N.Bruchanov*, O.K.Chugunov*, S.T.Latushkin*, K.E.Prichodko*, V.N. Unezhev* , R.Assmann**, O.Aberle**, A.Bertarelli ** *Russian Research Centre “Kurchatov Institute”, 123182, Moscow, Kurchatov Sq.1, Russia

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Studies of radiation effects on graphite collimator materials

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  1. Studies of radiation effects on graphite collimator materials A.I.Ryazanov*, A.N.Bruchanov*, O.K.Chugunov*,S.T.Latushkin*,K.E.Prichodko*, V.N. Unezhev*, R.Assmann**, O.Aberle**, A.Bertarelli** *Russian Research Centre “Kurchatov Institute”, 123182, Moscow, Kurchatov Sq.1, Russia **CERN CH-1211 GENEVA 23, Switzerland • “ • ＊ 4 September 2007, CERN, Geneva

  2. Task: Irradiation Damage Assessment of LHC Graphite Collimator Materials • Main aim of studies – to measure the effect of irradiation on physical-mechanical material properties: thermal conductivity, thermal expansion, mechanical properties, electrical resistivity, microstructure change Objective: • Determine the effect ofPKA carbon atoms energy spectrum near 7 TeV proton beam on physical -mechanical properties of graphite collimator materials for LHC – irradiation of graphite by carbon ions with the different energiesand doses 4 September 2007, CERN, Geneva

  3. Neutron energy spectrum per one 7 TeV proton in graphite on the several penetration depths of proton. E’n • En • • • EPKA=EC 4 September 2007, CERN, Geneva

  4. Graphite Sheave for Atomic Station Before irradiation After neutron irradiation 4 September 2007, CERN, Geneva

  5. Investigated Graphite Collimator Materials for LHC • C-C Composite Graphite REC • C-C Composite Graphite Material AC • High Density Graphite Material R4SSO 4 September 2007, CERN, Geneva

  6. Measured values • d -density • λ- thermal conductivity coefficient (at T < 700°С) • ρ-electrical resistivity(at T < 700°С) • α-thermal expansion coefficient(at T < 700°С) • σ-compression ultimate tensile stress • Ed -dynamic elastic module • Es -static elastic module • a, c - lattice constants (X-ray method) 4 September 2007, CERN, Geneva

  7. Результаты измерений исходных физико-механических свойств графитовых образцов. Measurements of Initial Properties of C-C Materials 4 September 2007, CERN, Geneva

  8. Temperature dependence of thermal conductivity coefficient (1 – REC, 2 – AC150, 3 – R4SSO). 4 September 2007, CERN, Geneva

  9. Temperature dependence of electrical resistivity (1 – REC, 2 – AC150, 3 – R4SSO). 4 September 2007, CERN, Geneva

  10. Temperature dependence of thermal expansion coefficient ofREC. 4 September 2007, CERN, Geneva

  11. Temperature dependence of thermal expansion coefficient ofAC 150. 4 September 2007, CERN, Geneva

  12. Temperature dependence of thermal expansion coefficient ofR4SSO. 4 September 2007, CERN, Geneva

  13. Temperature dependence of thermal expansion coefficients (1 – REC, 2 – AC150, 3 – R4SSO). 4 September 2007, CERN, Geneva

  14. Investigation of Radiation Induced Deformation graphite 4 September 2007, CERN, Geneva

  15. Experimental Measurement of Radiation Induced Deformation V  V (av)  Z  d av – Averaged dpa profile,  Z - Height of step between irradiated and no irradiated area, d - Penetration depth of irradiated sample. 4 September 2007, CERN, Geneva

  16. Dose dependence of radiation swelling in SiC 4 September 2007, CERN, Geneva

  17. Accelerators of Charge Particles of Russian Research Center “Kurchatov Institute” • Cyclotron of RRC KI: protons with energy< 35 MeV, currentJ < 30 mkA helium ionsHe4 with energy< 60 MeV,currentJ < 20 mkA ionsO16with energy< 120 MeV , currentJ < 5 mkA ionsC12 with energy< 80 MeV,currentJ < 5 mkA • Van de Graaf Accelerator: protonswith energy< 3 MeV, currentJ < 25 mkA 4 September 2007, CERN, Geneva

  18. Cyclotron of RRC “Kurchatov Institute” 4 September 2007, CERN, Geneva

  19. Generation Rate of Point Defects under Irradiation of Graphite by 5 MeV Carbon Ions at Irradiation Dose 5.10E17cm2 4 September 2007, CERN, Geneva

  20. Sample 3 Sample 1 Sample 2 Irradiated Area Scheme of Irradiation of Graphite Samples 4 September 2007, CERN, Geneva

  21. Picture of Irradiated and Unirradiated Sample Area,Measurement of Radiation Swelling

  22. Measurements of Radiation Induced Deformation in GraphiteComposite Material REC Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 3x10 E17 p/см 2 4 September 2007, CERN, Geneva

  23. Measurements of Radiation Induced Deformation in GraphiteComposite Material AC Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 1x10 E17 p/см 2 4 September 2007, CERN, Geneva

  24. Measurements of Radiation Induced Deformation in GraphiteComposite Material R4SSO Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 3x10 E17 p/см 2 4 September 2007, CERN, Geneva

  25. Measurements of Radiation Induced Deformation in Pyro -GraphiteMaterial Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 1x10 E17 p/см 2 4 September 2007, CERN, Geneva

  26. Analysis of Radiation Induced Erosion in GraphiteComposite Material REC Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 1x10 E17 p/см 2 4 September 2007, CERN, Geneva

  27. Analysis of Radiation Induced Erosion in GraphiteComposite Material R4SSO Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 1x10 E17 p/см 2 4 September 2007, CERN, Geneva

  28. Analysis of Radiation Induced Erosion in GraphiteComposite Material R4SSO Irradiated by Carbon Ions with the Energy 5 MeV at Irradiation Dose: 1x10 E17 p/см 2 4 September 2007, CERN, Geneva

  29. Dose Dependence of Radiation Swelling of Graphite Collimator Materials of LHC Dose, (C ions per cm2, 10E17) 4 September 2007, CERN, Geneva

  30. Dose Dependence of Radiation Swelling of Pyro-graphite Material Dose, (C ions per cm2, 10E17) Dose, (C ions per cm2, 10E17) 4 September 2007, CERN, Geneva

  31. Collision Events in Graphite under 35 MeV Proton Irradiation 4 September 2007, CERN, Geneva

  32. Future tests for of physical – mechanical properties changes on proton irradiated Graphite Collimator Materials for LHC The following measurements shall be performed in all three directions of the irradiated C-C graphite materials (where applicable): • Thermal conductivity (to ± 5W/m/K). • Electrical resistivity (to ± 1mΩm). • Thermal expansion coefficient (to ± 10-6 / ºC). • Mechanical strength (elastic modulus, deformation to rupture, ultimate tensile and compression stress, yield stress). • Microstructure change with scale (visual analysis). • Radiation erosion. • Density and specific heat. • Dimensions. Make analysis with TEM, STEM, radiography and mechanical and electrical test equipment on irradiated and non-irradiated samples. • Make theoretical analysis (dpa levels per sample and help in predictions for the LHC irradiation conditions). 4 September 2007, CERN, Geneva

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