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HiRadMat Window Design report v1.0

HiRadMat Window Design report v1.0. Specifications. Interface between machine vacuum and Atmospheric pressure 10 -9 mbar / P atm 10 -9 mbar… But might be from 10 -6 mbar to 10 -8 mbar… Giovanna ? Answer : 10 -8 mbar Patm … ? Protective atmosphere ?

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HiRadMat Window Design report v1.0

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  1. HiRadMat WindowDesign report v1.0 Michael MONTEIL- 2 March 2010

  2. Specifications • Interface between machine vacuum and Atmospheric pressure 10-9 mbar / Patm • 10-9 mbar… But might be from 10-6 mbar to 10-8 mbar… Giovanna ? Answer : 10-8 mbar • Patm… ? Protective atmosphere? • Resist to a proton beam size on the window : 1s = 0.5 mm “Beam Size at the TT66 Vacuum Window”, C. Hessler, 26.02.2010 Michael MONTEIL- 2 March 2010

  3. Focal Point – Layout Requirements “Beam Size at the TT66 Vacuum Window”, C. Hessler, 26.02.2010 Michael MONTEIL- 2 March 2010

  4. FLUKA analysis • No material can fit for 1s = 0.1mm • For 1s= 0.5mm, Beryllium and Carbon resist to the beam J.Blanco Sancho J.Blanco Sancho Michael MONTEIL- 2 March 2010

  5. Which material…Be or maybe…C-C ? • Be • Metal -> Tight • Simple window assembly • Thin thickness • Toxicity • Price • C-C • Safe material • High mechanical properties • Matrix not tight (5x10-2cm2/s) • Need to solve this problem • Need protective atmosphere Michael MONTEIL- 2 March 2010

  6. First choice : C-C • Meeting 10 Feb. 2010 : “[…] there was the idea to install a short (~10 cm) differential pumping section (~1x10-3 mbar) with carbon windows at both sides instead of the Be window.” Michael MONTEIL- 2 March 2010

  7. Window geometry • Carbon/Carbon composite: 1501 G from SGL • Cylindrical window • Diameter f 148 mm (To be verified) • Thickness: 1 cm (for pumping speed calculation) • Aperture (flange internal diameter): f 130 mm Michael MONTEIL- 2 March 2010

  8. Solutions #1 for C-C tightness problem:Differential vacuum • 1 Window C-C • Pumping speed needed: 8.4x109 l/s … • 2 Windows C-C with differential pumping • Pumping speed needed: 8.4x103 l/s … • 3 Windows C-C with differential pumping • Pumping speed needed: 8.4x101 l/s OK Michael MONTEIL- 2 March 2010

  9. Solutions #2 for C-C tightness problem: Add a Graphite foil • More tight than C-C (5x10-2cm2/s) • Low CTE (1x10-6 /K) • Low Elasticity modulus → Need to be flatter on theC-C plate on the atmospheric-pressure side. • Thickness: 1mm Michael MONTEIL- 2 March 2010

  10. Solutions #2 for C-C tightness problem: Add a Graphite foil • 1 Window C-C + Graphite • Pumping speed needed: 8.4x107l/s … • 1 Window C-C + Graphite & 1 window Graphite • Pumping speed needed: 8.4x101 l/s OK Michael MONTEIL- 2 March 2010

  11. Solution #3 : Tight steel“ring” with a C-C plate • 1 Window Steel / C-C • Pumping speed needed: 8.4x106 l/s • 2 Window Steel / C-C • Pumping speed needed: 8.4 l/s Michael MONTEIL- 2 March 2010

  12. Sum up solution #1, #2 & #3 • 3 Windows C-C with differential pumping • Pumping speed needed: 8.4x101 l/s OK • 1 Window C-C + Graphite & 1 window Graphite • Pumping speed needed: 8.4x101 l/s OK • 2 Window Steel / C-C • Pumping speed needed: 8.4 l/s Michael MONTEIL- 2 March 2010

  13. Solution #1, #2 & #3 ; upgrade idea… • Previous calculations made with a 10-9 mbar vacuum. • Decreasing pressure in Vacuum side with serial pumps Michael MONTEIL- 2 March 2010

  14. Solution #4 : Beryllium • Metal -> Tight !! No differential pumping • Simple window assembly • Thin thickness • Toxicity • Price Michael MONTEIL- 2 March 2010

  15. ANSYS Studystresses and deflection - C-C under DP = 1.4atm • Linear circular fixed support • 2 planes of symmetry • Geometry • Diameter f 148 mm (To be verified) • Thickness: 5 mm • Aperture: f 130 mm Michael MONTEIL- 2 March 2010

  16. ANSYS Studystresses and deflection - C-C under DP = 1.4atm • Orthotropic properties : 18 plies [0°/90°…] • Smooth and continuous temperature distribution • Through-thickness energy deposition • Coefficient of Thermal Expansion varying with temperature and directions Michael MONTEIL- 2 March 2010

  17. Pressure load - Deflection Michael MONTEIL- 2 March 2010

  18. Pressure load – Von Mises Michael MONTEIL- 2 March 2010

  19. Pressure load – Tsaï-Wu Michael MONTEIL- 2 March 2010

  20. Thermal load ANSYS input =FLUKA output • C-C | 1s = 0.25 mm | 1.7e11 p+ • Axisymmetrical radial temperature field Radial T (°C) T (°C) R (cm) Z (cm) Depth Michael MONTEIL- 2 March 2010

  21. Pressure + Thermal load – Deflection Michael MONTEIL- 2 March 2010

  22. Pressure + Thermal load – Von Mises Michael MONTEIL- 2 March 2010

  23. Pressure + Thermal load – Tsaï-Wu Michael MONTEIL- 2 March 2010

  24. To do : • Estimate thermal stresses in the graphite foil • Anyway lower than the stresses in the C-C because • rGraphite is lower than rC-C • ThicknessGraphite is lower than ThicknessC-C • Investigate Beryllium Window solution • Stresses under pressure and thermal loads Michael MONTEIL- 2 March 2010

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