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Alexandre MARIET BE/BI/ML CERN

Recherche du matériau idéal pour les fils micrométriques des wire-scanners. Alexandre MARIET BE/BI/ML CERN. CNT wires. Conclusion. Introduction générale. Caractéristiques faisceaux. General introduction. Analysis method. Mechanical analysis. Anneaux d’intérêt pour l’étude.

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Alexandre MARIET BE/BI/ML CERN

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  1. Recherche du matériau idéal pour les fils micrométriques des wire-scanners Alexandre MARIET BE/BI/ML CERN A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  2. CNT wires • Conclusion Introduction générale Caractéristiques faisceaux • General introduction • Analysis method • Mechanical analysis Anneaux d’intérêt pour l’étude Source: *: E.B. Holzer, Functional specifications for beam transverse profile measurement as part of the LHC injectors upgrade and consolidation projects, March 2018 Source **: J.L. Sirvent Blasco, Beam Secondary Shower Acquisition Design for the CERN high Accuracy Wire Scanner, 2018 A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  3. Introduction générale • CNT wires • Conclusion Nouveau wire-scanner • General introduction • Analysis method • Mechanical analysis Configuration des wire-scanners Principe de fonctionnement du wire-scanner rotatif A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  4. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Problème Haute intensité LIU Diminution taille faisceau A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  5. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Problème Haute intensité LIU Résolution suffisante 3 points par sigma Diminution vitesse scan Diminution taille faisceau A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  6. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Problème Haute intensité LIU Résolution suffisante 3 points par sigma Diminution vitesse scan Diminution taille faisceau Surchauffe du fil Fil de carbon détérioré * Source *: M. Sapinski, B. Dehning, A. Guerrero, J. Koopman, E. Metral, Carbon A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  7. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Solutions Surchauffe du fil A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  8. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Solutions Surchauffe du fil Augmentation vitesse scan A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  9. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Solutions PSB : OK PS : OK Surchauffe du fil Augmentation vitesse scan Points per sigma Scan speed [m.s-1] A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  10. Analysis method • General introduction • Conclusion • CNT wires • Mechanical analysis Méthode d’analyse Solutions PSB : OK PS : OK Surchauffe du fil Augmentation vitesse scan Points per sigma SPS : PAS OK Scan speed [m.s-1] Vitesse max dans le SPS : 4.3 m.s-1 A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  11. Analysis method • General introduction • CNT wires • Conclusion • Mechanical analysis Méthode d’analyse Solutions Beryllium Carbon Titane Fer Cuivre Tungstène (Be) (C) (Ti) (Fe) (Cu) (W) PSB : OK PS : OK Surchauffe du fil Augmentation vitesse scan • Matériau idéal • Caractérisation nouveau matériau SPS : PAS OK Carbon NanoTube (CNT) • Calcul de la déformation maximale lors du scan pour chaque matériau • Caractérisation des propriétés des fils en CNT A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  12. General introduction • Analysis method • Conclusion • CNT wires • Mechanical analysis Analyse mécanique x L z y R L : Longueur du fil R : Distance entre le fil et l’axe de rotation (arbre) A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  13. General introduction • Analysis method • Conclusion • CNT wires • Mechanical analysis Analyse mécanique Précharge max autorisée et paramètre alpha pour le calcul de déformation Fonction instrument: paramètres scanner Fonction matériau: propriétés intrinsèques σult: Contrainte max avant rupture (UTS) A. MARIET - BE/BI/ML - CERN BI Day 2018 - Etat stationnaire

  14. General introduction • Analysis method • Conclusion • CNT wires • Mechanical analysis Analyse mécanique Déformation max PS conditions PS conditions @ 20 m.s-1 Fp = 0,8 Fp max Max deflection [μm] Max deflection [μm] Scan speed [m.s-1] Pre-tension load [N] A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  15. Analyse mécanique • Carbone: meilleur rapport densité / UTS • Solution pour le SPS, trouver un matériau qui: • Conserve les propriétés mécaniques • Diminue la densité A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  16. Analyse mécanique ρ = 10-100 kg.m-3 = 17 x moins dense que le carbone graphite Source **: HitachiZosencorpo A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  17. General introduction • Analysis method • Conclusion • Mechanical analysis • CNT wires CNT wires Introduction to CNT • Allotropes of carbon with a long and hollow nanostructure • Composed of a wallformed by a sheet of graphene • Length to diameter ratio up to 1 000 000 : 1 • Extraordinarythermalconductivity, mechanical and electricalproperties • Individual nanotubes naturally align themselves into "ropes" held together by Van der Waals forces CNT wire procurement CNT representation Source **: HitachiZosencorpo A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  18. General introduction • Analysis method • Conclusion • Mechanical analysis • CNT wires CNT wires Structure CNT 100 µm ~ 0,5 µm ~ 20 nm Wire (x 230) Strips (x 346 & x 10.5k) CNT (x 11.9k & x 127k) With the courtesy of M. MEYER A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  19. General introduction • Analysis method • Conclusion • Mechanical analysis • CNT wires CNT Wires Preparation Wire coppering control good CNT wire preparation grid Same process than for usual graphite wires A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  20. General introduction • Analysis method • Conclusion • Mechanical analysis • CNT wires CNT wires Tensile results OBTAINED UTSmax = 558 MPa Average = 501 MPa StD = 47 OBTAINED UTSmax = 528 MPa Average = 367 MPa StD = 107 OBTAINED UTSmax = 836 MPa Average = 771 MPa StD = 61 EXPECTED UTSmax = 530 MPa EXPECTED UTSmax = 780 MPa EXPECTED UTSmax = 870 MPa A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  21. CNT wires Tensile results Equivalent diameter (µm) Max load (g) Conclusion : To respect a maximum diameter of 35 µm we should minimize the size of the diameter (bigger UTS) and maximize the number of fibers A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  22. General introduction • Analysis method • Conclusion • Mechanical analysis • CNT wires CNT wires Contractor oven Graphite casing Preliminary thermal tests CERN oven Stainless steel and tungsten support • Test conditions • Vacuum level : < 5.10-3 mb • Temperature increase : 300°C/h during4h • Plateau : 1200°C during 1h • Cooling : Free A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  23. CNT wires Preliminary thermal tests CERN • Thin layer (350 nm) composed of tungsten and strontium recovering the entire wire. Cracks probably due to the manipulation. Contractor • Surface not as smooth as before the treatment • Increase of 27% of the diameter • Tendency to curl up on itself With the courtesy of M. MEYER A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  24. General introduction • Analysis method • Conclusion • Mechanical analysis • CNT wires CNT wires First results Vertical scan profile – Graphite carbon Horizontal scan profile – CNT wire Signal amplitude Signal amplitude Wire position Wire position A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  25. General introduction • Analysis method • CNT wires • Mechanical analysis • Conclusion Conclusion • Regardless of the configuration, carbon is the best material • Decrease of the UTS with the increase of the diameter for CNT wires • Very long thermal cycle seems to alter the surface state (compare to reality) • CNT wires could be used for other wire instruments like SEM grids • Interest of other sections like for the electrostatic septa. Projects under consideration • Development of a test bench for CNT wire thermal properties characterization at extreme temperature • Development of a braiding machine for microscopic scale wires • Collaboration with Oxford university to manufacture custom wires A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  26. Thank you for your attention A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  27. A. MARIET - BE/BI/ML - CERN BI Day 2018 -

  28. Annexes Motion equation Scan parameters Resolution Solution for stationary state equation A. MARIET - BE/BI/ML - CERN BI Day 2018 -

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