1 Fulvio TESSAROTTO the new RICH beam pipe the new RICH beam pipe - pipe production, gluing and tests - measurement and removal of the old pipe - fixation system - installation of the new pipe - characteristics of the new pipe COMPASS TB meeting, CERN, 12/04/2012 Fulvio Tessarotto

2 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 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

3 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 tubes, microflanges, gluing tests weight = 15 g

4 Fulvio TESSAROTTO Simulations for the new pipe max = 0.1 Mpa, yield strength = 85 MPa COMPASS TB meeting, CERN, 12/04/2012

5 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 half-pipe He leak tests Measured leak, including connections: 0.5 ml/h

6 Fulvio TESSAROTTO “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! Firenze, 22/03/2012

7 Fulvio TESSAROTTO 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 COMPASS TB meeting, CERN, 12/04/2012

8 Fulvio TESSAROTTO 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 COMPASS TB meeting, CERN, 12/04/2012

9 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 gluing end-caps on the single pipe

10 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 Careful packaging

11 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 And transport

12 Fulvio TESSAROTTO 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 COMPASS TB meeting, CERN, 12/04/2012

13 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 Pre-alignment of pipe holders

14 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 the new pipe inside the RICH

15 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 The polycarbonate suspension ring

16 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012

17 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 New fixation system and gas pipes

18 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 Pipe specifications Inner diameter: mm ( ) 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

19 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 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 X 0 )

20 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 Measurement and adjustment

21 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 position regulation and surveying

22 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 12/04/2012 Material budget actual pipe material budget: (0.15 mm / 17.6 mm)8.523 ‰ X 0 goal for the material budget of the new pipe:10% actual =0.852 ‰ X 0 5 layers of 27 μm thick Mylar : (0.135 mm / 287 mm) ‰ X 0 5 layers of 200 nm thick Al coating: (1.0 μm / 89 mm)0.011 ‰ X 0 4 layers of 6 μm thick Mylar glue: (24 μm / 280 mm) ‰ X total material budget for orthogonal crossing:0.567 ‰ X 0 total material budget for parallel crossing (r < 42 mm):2.26 ‰ X 0 parallel crossing (42 mm < r < 49 mm):1.9 % X 0 6 mrad particle crossing the pipe (old value = 1.4 X 0 )9 % X 0 The contribution from end caps, fixation rings, gas connections has been minimized

23 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 time schedule RICH opening February 21 Scaffolding mountedFebruary 24 Old pipe measurement March 6 Removal of the old pipeMarch 7 Mirror measurementMarch 16 Installation of the new pipe April 5 He leak testApril 17 Scaffolding dismountingApril 18 RICH closingApril 19 or April 25