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New materials for LHCb support systems L. Leduc, J. Chauré , G. Corti, M. Gallilee, R. Veness

New materials for LHCb support systems L. Leduc, J. Chauré , G. Corti, M. Gallilee, R. Veness. OUTLINE. Current layout Material selection criteria – Optimization for transparency New support system proposal Testing Safety. CURRENT LAYOUT. LhCb current layout :

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New materials for LHCb support systems L. Leduc, J. Chauré , G. Corti, M. Gallilee, R. Veness

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  1. New materials for LHCb support systems L. Leduc, J. Chauré, G. Corti, M. Gallilee, R. Veness

  2. OUTLINE Currentlayout Materialselectioncriteria – Optimization for transparency New support system proposal Testing Safety

  3. CURRENT LAYOUT • LhCbcurrentlayout: • 8 stainlesssteelrods • 8 stainlesssteelcables • 2 aluminium collars • 2 vespel rings The support system is a source of background signal Need to optimize -> the materialsinvolved -> the geometry

  4. NEW MATERIALS Criteria for selection: 1. Provide acceptable mechanicalproperties; 2. Reduce the traversedamount of matter 3. Improved radiation length The radiation lengthλof a material is the mean length (in cm) of matter over which a high energy electron has its energy reduced by the factor 1/e. λdepends on both Z and A Usuallyexpressed in g/cm2 or cm

  5. WIRE SYSTEM Constraints on the design: axial force F when the chamberisevacuated stiffness : the axial displacementshouldbelimited -> axial stiffnessshouldbehighenough Current solution: 8mm diameterstainlesssteelrods 3mm stainlesssteelwires F

  6. WIRE SYSTEM – SOLUTION N°1 Flexible cablesreplaced by Vectran/Technoraropes Technorarepeating unit [C14O2N2H10]m-[C20O3N2H14]n Vectranrepeating unit [C7O20H4]m-[C11O2H6]n • Rigidrodsreplaced by carbonfiberreinforcedepoxy tubes • M46J High Modulusfibers (Toray) • Lay up: [+-8°/90°/+-8°/+-8°/90°/+-8°] • Gluing to aluminium terminationwitharaldite • Produced by Mateduc Composites • Gluing to termination in CERN polymerlab: S. Clément • Testing in CERN mechanicallab : A. Gerardin Splicedeye and vespel ring termination

  7. WIRE SYSTEM-SOLUTION N°2 (BACKUP) Selectedmaterial: Aluminium design λ=70mm Rigidwiregeometry : Tube ID:15 mm, OD:20 mm Flexible wire solution: Tube ID:3 mm, OD:8 mm The solution willbescrewed to termination

  8. TRANSPARENCY Indicator for transparency: For the rope/rod 5 mm diameter y 0 x R lx Caracteristiclength Indicator of transparency I=d/λ

  9. TRANSPARENCY • Indicator for transparency: • For a tube ID= 14 mm; OD=18 mm y lx 0 x R Caracteristiclength Indicator of transparency I=d/λ

  10. COMPARISON OF SOLUTIONS • Performance of both solutions → Much lighter solutions while keeping acceptable mechanical properties

  11. INTERFACE RING Current solution: Material : graphite reinforcedVespel (polyimide ) Aluminum ring for bake out New solution Material: Celazole [C20H12N4] Couldbeusedduringbakeout Comparison of materialproperties

  12. INTERFACE RING Volume optimization Reducedthickness of the ring Reducednumber of fasteners Materialoptimization Currentlystainlesssteelfasteners New solution ->Titaniumfasteners Celazoleis more transparent thanVespel

  13. TESTS Radiation testingorganized by G. Spiezia (RP): LHCbcalculated dose over 20 running years: 2MGy Materials: Celazole & Vectran, technoraropes 9 dose steps: 0-> 10 Mgyat dose rate of 70 kGy/h one additionalstepat 1 kGy/h to 500kGy -> to assess dose rate effects Required information: strength and stiffness Fraunhoffer Institute in Germany -> October Creep tests: Syntheticropes CFRP tubes (glue) Before and afterbakeout (50°C) Possibility of acceleratingcreep rate by increasingtemperature -> life time MECASEM SA in France Assembly tests Aluminum prototype for collar/attachment and interface ring Mock up of the chamber Wire system with a scale 1:3

  14. SAFETY ASPECTS Ongoing discussion with J. Gulley, P. Silva and D.D Phan fromsafety riskassessment of using → Berylliumcollar/attachment system → Synthetic simple braidropes Use of Beryllium write a procedure of the assembly riskassessment (drop or scratch of the item, …) procedure in case of hazards ex: scratch of a piece → stop the handling → dismanteling → use of a glove box Use of syntheticropes Safety team want to bepresent for the tests Procedure and riskassessment in case of fire

  15. CONCLUSIONS The proposed system islighterthan the current one: from 90% (wire) to 65% (fasteners) Safetyisbeingcarefullyincluded in the design Back up solutions are proposed, that are lighterthan the current system ACKNOWLEDGEMENTS M. Guinchard, H. Rambeau, H. Kos, P. Coly, P. Lepeule, C. Loureaux, G. Foffano, S. Clément, G. Kirby, J. Gulley, P. Silva, D.D Phan, G. Spiezia.

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