1. All-metal joints studies related to the mechanical and irradiation Przemyslaw Lutkiewicz Supervisors: Christian Rathjen, CERN Cedric Garion, CERN Blazej Skoczen, CUT

2. “All metal joints studies related to the mechanical and irradiation load” Przemyslaw Lutkiewicz AT/VAC

3. ConFlat joint Przemyslaw Lutkiewicz AT/VAC CLIC joint particle beam flow material under mechanical load and radiation Mechanical load

4. ConFlat join setup ConFlat joint concept Przemyslaw Lutkiewicz AT/VAC

6. Przemyslaw Lutkiewicz AT/VAC ; Przemyslaw.Lutkiewicz@cern.ch Fig. 9. Anisotropic model: a; Distribution of micro-damage (D11, D22, and D33) compared to evolution of plastic strain intensity (EPSE), b; Evolution of micro-damage components as a function of depth Fig. 4. Damage parameter D and elastic unloading modulus E as a function of strain at 4.2 K

7. Sealing force evolution Przemyslaw Lutkiewicz AT/VAC FE calculations experiments

8. Sealing force evolution Przemyslaw Lutkiewicz AT/VAC

9. Locating pins Experiment setup

10. Leak rate evolutionTightness during compression Przemyslaw Lutkiewicz AT/VAC

12. Przemyslaw Lutkiewicz AT/VAC ; Przemyslaw.Lutkiewicz@cern.ch

13. CLIC gasket vs 2 CHF coin Joint concept Drawbacks (things to be improved): Large and non constant displacements into gasket aperture (0.25 mm = ¼ of the gasket thickness) Different contact pressure distribution for upper and lower surface of the gasket Trapped volume and grove weakness 0.25 Lateral profile of the maximum inner displacements Contact pressure between upper gasket surface and flange Contact pressure between lower gasket surface and flange No sealing Sealing No sealing Sealing Contact pressure between upper gasket surface and flange No sealing Sealing Trapped volume Contact pressure near grove No sealingSealingNo sealing Sealing

14. Symmetry Existing design concept Przemyslaw Lutkiewicz AT/VAC gasket flange gasket flange New CLIC design concept

15.  Homogeneous contact pressure – the joint is symmetric type (sexless) Przemyslaw Lutkiewicz AT/VAC ; Przemyslaw.Lutkiewicz@cern.ch  Cheaper production – simple and easy to machine gasket shape and one type of flange  Easier assembly – symmetric, self-placed gasket with additional pins centering joint system  Superior RF properties – smooth flange-gasket-flange transition SYMMETRY NO SYMMETRY New proposalOld design 2) 3) 1) 2) 1)Female flange 2) Gasket with moderate shape 3) Male flange 1)One type of flange 2) Gasket with simple shape self-placed gasket self-placed gasket + Pins centering joint system 0.25 mm 0.15 mm Flange Gasket > 0.1 mm Flange Gasket

16. Przemyslaw Lutkiewicz AT/VAC Theoretical leak rate Total leak rate Collar interaction Thickness [mm] Imprint depth [mm] Alpha [deg] Beta [deg] Initial position [mm] Initial values Yes2.00.3 305-0.35 Final valuesNo2.50.3355-0.1 Alpha (Q 1 ) Beta (Q 2 ) Gasket thickness Initial position

17. Przemyslaw Lutkiewicz AT/VAC Q1Q1 Q2Q2 collar interaction no collar interaction

18. Przemyslaw Lutkiewicz AT/VAC Displacement into the aperture

19. Przemyslaw Lutkiewicz AT/VAC Pressure distribution through the gasket circumferance

20. Przemyslaw Lutkiewicz AT/VAC ; Przemyslaw.Lutkiewicz@cern.ch The leak tightness level Joint at the experiment

21. Przemyslaw Lutkiewicz AT/VAC

22. Non Ionizing Energy Loss profile Przemyslaw Lutkiewicz AT/VAC

23. 1 MeV neutron equivalent flow.

24. Tensile tests results for different irradiation dose [dpa] Przemyslaw Lutkiewicz AT/VAC

25. Orowan mechanism Przemyslaw Lutkiewicz AT/VAC Irradiation defects Hardening as a [dpa] dose function

26. Offset in the material properties at true stress- true strain space Przemyslaw Lutkiewicz AT/VAC

27. Representative Volume Element AsAs Mechanical load ADAD Elastic modules changes for OFS copper Przemyslaw Lutkiewicz AT/VAC

28. particle beam flow material under mechanical load and radiation Mechanical load Przemyslaw Lutkiewicz AT/VAC Irradiation influence on the material structure

29. SRIM calculation (Monte-Carlo method) micro-voids cluster formation Micro-voids cluster Przemyslaw Lutkiewicz AT/VAC

30. Mechanical damage for irradiated CF gasket Post-irradiation damage for irradiated CF gasket

31. Przemyslaw Lutkiewicz AT/VAC Post-irradiation damage evolution for different [dpa] values

32. Przemyslaw Lutkiewicz AT/VAC Results differences for different approaches

33. Przemyslaw Lutkiewicz AT/VAC

34. With width like old design With width like 1/3 of old design Przemyslaw Lutkiewicz AT/VAC