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Update on the thin RICH beam pipe project

Update on the thin RICH beam pipe project. Fulvio Tessarotto. - prototypes validation and pipe production - microflanges and fixation system - the intervention inside the RICH - proposed schedule - mirror alignment measurement. Production of the thin tubes.

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Update on the thin RICH beam pipe project

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  1. Update on thethin RICH beam pipe project Fulvio Tessarotto - prototypes validation and pipe production - microflanges and fixation system - the intervention inside the RICH - proposed schedule - mirror alignment measurement Fulvio TESSAROTTO

  2. Production of the thin tubes • November 2011: production of “final size prototypes” from Lamina failed • they refused to deliver the tubes because of “bubble problems” • R&D at Lamina; modification in the production procedure introduced • shorter prototypes (L = 1m) produced and shipped to Trieste • December 2011: test of the shorter prototypes with thick flanges • validation of the aluminized Mylar tubes ( leak ~ 1 ml/h ) • decision on the final material and order to proceed to production • January 2012: further improvement in the production procedure • 5 pipes produced and shipped to Trieste Fulvio TESSAROTTO

  3. Aluminized Mylar tube winding Fulvio TESSAROTTO

  4. Aluminized Mylar tube prototype Fulvio TESSAROTTO

  5. Aluminized Mylar tube prototype Fulvio TESSAROTTO

  6. evolution from thick flanges Fulvio TESSAROTTO

  7. to microflanges (first types) Fulvio TESSAROTTO

  8. microflange: validated type Fulvio TESSAROTTO

  9. Aluminized mylar tube prototype machined piece CAD Drawing Fulvio TESSAROTTO

  10. stress and deformation studies with 50 N: maximal deformation = 38 μm Fulvio TESSAROTTO

  11. stress and deformation studies with 50 N: maximal stress = 16 N/mm2 (Al yeild strength = 185 N/mm2) byD. Scibetta Fulvio TESSAROTTO

  12. Validation of microflangeglueing Complete prototype glued Al pipe Fulvio TESSAROTTO

  13. He leak measurement on prototypes • Prototype with multilayer aluminized Mylar and microflange • Volume = 8 l, fluxed with He, overpressure = 40 mbar • Internal overpressure monitored for one week • Measurement inside a thermal isolation box • External pressure, temperature, humidity recorded • Corrections computed for temperature, pressure and volume changes •  measured leak: 0.3 ml/h • ALUMINIZED MYLAR AND GLUED MICROFLAGES ARE VALIDATED Fulvio TESSAROTTO

  14. The inox “Test chamber” • This stainless steel pipe with 240 mm inner radius and 2 m length hosts the He leak measurements based on differential pressure. • An MKS BARATRON Type 226 A provides 0.3 % resolution (50 mbar max) on the differential pressure (leak independent on T and p at first order). Fulvio TESSAROTTO

  15. Material budget actual pipe material budget: (0.15 mm / 17.6 mm) 8.523 ‰ X0 goal for the material budget of the new pipe: 10% actual = 0.852 ‰ X0 5 layers of 27 μm thick Mylar : (0.135 mm / 287 mm) 0.470 ‰ X0 5 layers of 200 nm thick Al coating: (1.0 μm / 89 mm) 0.011 ‰ X0 • 4 layers of 6 μm thick Mylar glue: (24 μm / 280 mm) 0.086 ‰ X0 ----------------------------------------------------------------------------------------------------------- total material budget for orthogonal crossing: 0.567 ‰ X0 • total material budget for parallel crossing (r < 42 mm): 2.26 ‰ X0 • parallel crossing (42 mm < r < 49 mm): 1.9 % X0 6 mrad particle crossing the pipe (actual value = 1.4 X0) 9 % X0 The contribution from end caps, fixation rings, gas connections will be minimized Fulvio TESSAROTTO

  16. Recent progress in understanding: Issue status Removal of presently used pipe Extremely difficult behind the mirrors Material for the thin pipe 5 layer aluminized Mylar, 0.6 ‰ X Geometry 2 pipes 100 mm diam., 1570 mm long Gas He, few l/h, 15 mbar overpressure • End caps alum. Mylar glued on Al microflanges Fixation system Thin stainless steel wire ropes Extremely difficult behind the mirror wall: still to be defined Fulvio TESSAROTTO

  17. New pipe Fulvio TESSAROTTO

  18. New pipes inside the RICH Fulvio TESSAROTTO

  19. New pipes inside the RICH Fulvio TESSAROTTO

  20. Difficult pipe fixation Fulvio TESSAROTTO

  21. Stainless steel wire ropes Fulvio TESSAROTTO

  22. Microwire ropes solution under investigation Fulvio TESSAROTTO

  23. Proposed time schedule RICH opening February 17 Scaffolding mounted February 24 Old pipe measurement March 2 Removal of the old pipe March 8 Mirror measurement March 16 Installation of the thin pipes March 29 Scaffolding dismounted April 13 RICH closing April 17 People directly involved: Didier Piedigrossi(LHCb) V. Anosov, D. Cotte, G. Mallot, J.C. Gayde (+ A.B.,D.M.,M.B.,G.C.,E.L.,P.A.), F. Tessarotto, S. Levorato, G. Menon, A. Kosoveu, L.Rinaldi, M. Gregori, A.Zanetti, C. Azzan, D. Iugovaz, F. Borotto, M. Marengo, L. Steiger, M. Sulc. M. Alexeev, … Fulvio TESSAROTTO

  24. Jura bottom

  25. Salevebottom

  26. Salevetop

  27. Jura top

  28. Photogrammetry targets (PTs) There are important for precious determination of all four camera projection - principal points for CLAM We have 5-6 PTs for quadrant but they are placed in on plane, so the positions are not independent At least two new PTs (for each four quadrants) must be placed inside the RICH vessel to increase accuracy of absolute measurement

  29. Sketch of Photogrammetry targets positions inside RICH – today’s situation

  30. Towardsabsolutemeasurement… Where to put additionalopticaltargets?

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