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the new RICH beam pipe

the new RICH beam pipe. Fulvio Tessarotto. - pipe production, gluing and tests - measurement and removal of the old pipe - fixation system - installation of the new pipe - characteristics of the new pipe. Slide from the last TB:. Issue status

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the new RICH beam pipe

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  1. the new RICH beam pipe Fulvio Tessarotto - pipe production, gluing and tests - measurement and removal of the old pipe - fixation system - installation of the new pipe - characteristics of the new pipe Fulvio TESSAROTTO

  2. Slide from the last TB: 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

  3. tubes, microflanges, gluing tests weight = 15 g Fulvio TESSAROTTO

  4. Simulations for the new pipe max = 0.1 Mpa, yield strength = 85 MPa Fulvio TESSAROTTO

  5. half-pipe He leak tests Measured leak, including connections: 0.5 ml/h Fulvio TESSAROTTO

  6. “Safety is the first of our priorities” - RICH is a “confined space”: access is allowed to authorized persons only - Authorization requires a confined space formation course and a medical certification - New procedure: CERN asks for medical certification to be provided by the Institutes. • Inside the RICH we needed a scaffolding: the old scaffolding is not complying to the rules. • The new scaffolding can only be mounted by authorized people. • The authorisation requires …. 1) a general CERN confined space course was organized and people sent to attend it 2) a medical check and certification protocol was defined, agreed upon and applied in Trieste 3) the activity inside the RICH was defined in detail and an access protocol was produced 4) the supervisor was changed 5) special exception to allow access for radioprotection experts, scaffolding responsible, etc. 6) a scaffolding was borrowed / built and certified by the responsible in Clean Area 7) authorization to mount the scaffolding by ourselves was obtained 8) authorization to use the scaffolding (after check) with a use protocol was provided 9) … 10) … All involved persons have been extremely collaborative! Fulvio TESSAROTTO

  7. RICH opening, old pipe removal 1) Radiation level: < 0.2 μSv/h 2) Surveying of the old pipe 3) Large scaffolding installation 4) Small scaffolding installation 5) Removal of the old pipe 4) Mirrors surveying Fulvio TESSAROTTO

  8. After the removal of the old pipe - We confirmed it is not possible to access the area downstream of the mirrors - We decided to change the fixation system and the gas pipes to reduce the material 1) We prepared two beam pipes of 1.6 m and tested them: measured leak rate: 0.5 ml/h 2) We decided to produce a unique pipe by gluing two halves on 1.6 m 3) The vertical middle gluing needed a special microflange and a system for vertical operation 4) We continued to put pressure on Lamina, despite the denials, to try producing a 3.2 m tube 5) One 3.5 m long tube arrived in Trieste just in time. 6) The microflanges and the system for gluing were ready: the long pipe was glued and 7) Tested together with the “Tygon” pipes and plastic strips for gas connection: 0.6 ml/h 8) Both long pipes (single piece and two-halves shipped to CERN) 9) We checked that two suspensions are enough (pipe rigidity better than expected)  Two fixation points are enough Fulvio TESSAROTTO

  9. gluing end-caps on the single pipe Fulvio TESSAROTTO

  10. Careful packaging Fulvio TESSAROTTO

  11. And transport Fulvio TESSAROTTO

  12. Preparation for the new pipe 10) Putting in place the top fixation systems was challenging but successful 11) Dummy flanges positioned using a laser system 12) Pipe introduced in the RICH and put in place 13) Surveying to check the position found several millimeter offsets 14) Position partially corrected and fixation system tensioned at 2 kg Fulvio TESSAROTTO

  13. Pre-alignment of pipe holders Fulvio TESSAROTTO

  14. the new pipe inside the RICH Fulvio TESSAROTTO

  15. The polycarbonate suspension ring Fulvio TESSAROTTO

  16. Fulvio TESSAROTTO

  17. New fixation system and gas pipes Fulvio TESSAROTTO

  18. Pipe specifications Inner diameter: 100.0 mm (+0.0-0.1) Thickness: 140 μm Length: 3140 mm Material: Mylar (PET) + 1 μm Al Single pipe, front and rear window: same material: 140 μm Mylar + 1 μm Al Microflanges: “F” shape Al, 0.5 mm thick Upstream microflange acts as holder, Downstream holder at 80 cm from edge, Policarbonate 8mm x 8mm + 2 nylon screws Fixation via stainless steel microwire ropes: 4 ropes (90 degrees) per holder, 1 x 7 wires 90 μm diam. (limit = 9 kg) + 10 μm nylon coating, tensioning: 2 kg, thermal expansion +- 2 mm, equiv. 1 kg Adjustement and tensioning microsystems placed out of the acceptance Fulvio TESSAROTTO

  19. Upstream fixation and gas connections Total amount of material in the acceptance: Fe (8 m microwire ropes): 5 g Al ( 2 m pipe + microfl.): 60 g Mylar: 180 g Polycarbonate (fixation): 20 g Epoxy: 6 g Cu: 0.5 g Tygon: 5 g Nylon: 4 g Old gas pipes: 6x4 mm stainless steel tubes, new pipes: 6x5 mm Al pipes (10 times less X0) Fulvio TESSAROTTO

  20. Measurement and adjustment Fulvio TESSAROTTO

  21. position regulation and surveying Fulvio TESSAROTTO

  22. 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 (old value = 1.4 X0) 9 % X0 The contribution from end caps, fixation rings, gas connections has been minimized Fulvio TESSAROTTO

  23. time schedule RICH opening February 21 Scaffolding mounted February 24 Old pipe measurement March 6 Removal of the old pipe March 7 Mirror measurement March 16 Installation of the new pipe April 5 He leak test April 17 Scaffolding dismounting April 18 RICH closing April 19 or April 25 Fulvio TESSAROTTO

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