1 Fulvio TESSAROTTO Update on the thin RICH beam pipe project - prototypes validation and pipe production - microflanges and fixation system - the intervention inside the RICH - proposed schedule - mirror alignment measurement COMPASS TB meeting, CERN, 02/02/2012 Fulvio Tessarotto

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

3 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Aluminized Mylar tube winding

4 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Aluminized Mylar tube prototype

5 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Aluminized Mylar tube prototype

6 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 evolution from thick flanges

7 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 to microflanges (first types)

8 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 microflange: validated type

9 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Aluminized mylar tube prototype CAD Drawing machined piece

10 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 stress and deformation studies with 50 N: maximal deformation = 38 μm

11 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 stress and deformation studies with 50 N: maximal stress = 16 N/mm 2 (Al yeild strength = 185 N/mm 2 ) by D. Scibetta

12 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Validation of microflange glueing Complete prototype glued Al pipe

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

14 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 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).

15 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 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 (actual value = 1.4 X 0 )9 % X 0 The contribution from end caps, fixation rings, gas connections will be minimized

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

17 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 New pipe

18 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 New pipes inside the RICH

19 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 New pipes inside the RICH

20 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Difficult pipe fixation

21 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Stainless steel wire ropes

22 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Microwire ropes solution under investigation

23 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 02/02/2012 Proposed time schedule RICH opening February 17 Scaffolding mountedFebruary 24 Old pipe measurement March 2 Removal of the old pipeMarch 8 Mirror measurementMarch 16 Installation of the thin pipes March 29 Scaffolding dismountedApril 13 RICH closingApril 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, …

24 Jura bottom

25 Saleve bottom Saleve bottom

26 Saleve top Saleve top

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 Towards absolute measurement… Where to put additional optical targets?