1 Fulvio TESSAROTTO 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
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 - PowerPoint PPT Presentation
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1Fulvio TESSAROTTO
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
half-pipe He leak testsMeasured leak, including connections: 0.5 ml/h
6Fulvio 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
7Fulvio TESSAROTTO
RICH opening, old pipe removal1) Radiation level: < 0.2 μSv/h2) Surveying of the old pipe3) Large scaffolding installation4) Small scaffolding installation5) Removal of the old pipe4) Mirrors surveying
COMPASS TB meeting, CERN, 12/04/2012
8Fulvio 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
Preparation for the new pipe10) Putting in place the top fixation systems was challenging but successful11) Dummy flanges positioned using a laser system12) Pipe introduced in the RICH and put in place13) Surveying to check the position found several millimeter offsets14) Position partially corrected and fixation system tensioned at 2 kg
-----------------------------------------------------------------------------------------------------------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
RICH opening February 21Scaffolding mounted February 24Old pipe measurement March 6Removal of the old pipe March 7Mirror measurement March 16Installation of the new pipe April 5He leak test April 17Scaffolding dismounting April 18RICH closing April 19 or April 25