1 Fulvio TESSAROTTO Update on the thin RICH beam pipe project - tests on prototypes - pipe production by Lamina - gluing exercises - time schedule - conclusions COMPASS TB meeting, CERN, 10/11/2011 Fulvio Tessarotto

2 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Activity on prototypes - We received from Lamina 4 “non aluminized” pipe pieces: - diam. = 100 mm, L = 1.3 m, tot. thickness ~ 180 μm - 4 layers of 36 μm thick Mylar wound and glued with S100 bonding agent - One was cut to measure the material properties and perform gluing tests - inner diam. = , good compatibility with Araldite 2011, … -The second one has been equipped with aluminum end-cups to perform: - pressure tests (cylinder only for overpressure > 6 mbar) - deformation tests - He leak tests - Progress was possible because we solved problems of: - location (we equipped a room dedicated to these tests in Trieste) - technical manpower (two technicians are now helping on this project) - budget (INFN accepted to support the new RICH pipe)

3 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 The prototypes without Al coating

4 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 The Al flanges for this test

5 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 The gluing for this test

6 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 The result

7 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 The first He leak test

8 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Temperature and pressure recording

9 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011

10 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Simple He leak measurement - Volume = 10 l, fluxed with He, overpressure = 10 mbar, input closed. - Internal overpressure monitored for several hours: - External pressure, tempereature, humidity recorded too. - The overpressure evolves with T and P - Once corrected for temperature and pressure the observed leak is ~ 0.3 mbar/h or less. This corresponds to ~ 3 ml/h leak PRELIMINARY CONCLUSION: MYLAR AND GLUE ARE VALIDATED A stainless steel pipe with 240 mm radius and 2 m length, with flanges and gas connections has been bought and will host the higher accuracy He leak measurements and the other tests.

11 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 03/02/2011 at 25 º C and for 1 bar pressure difference, a 25 μm thick Mylar foil with a surface of 645 cm 2 leaks “typically” 150 cc/day  1 m 2 will leak ~0.1 l/h From the datasheet of the DuPont Teijin Mylar polyester film (the measurements have been performed using a 25 μm thick Mylar foil) Our validation figure is 10 ml/h Which includes a safety factor of 4 with respect To the maximum allowed leak rate of 1l/day For the prototype which has a surface of 0.4 m 2 and no coating we would expect a leak of ~ 40 ml/h divided by a “thickness factor”

12 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 For water vapor, the increase from 25 μm to 144 μm of the mylar thickness corresponds to a decrease of a factor ~8 in the transmission rate If the factor is the same for He, we would expect ~ 5 ml/h leak. We see ~3 ml/h expected leak: tickness factor

13 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 End-caps and gluing studies

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

15 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 microflange

16 Fulvio TESSAROTTO production of the pipes by Lamina The base material, coated by Sheldahl, has been checked by Lamina: - measured thickness = 27 μm, - surface resistivity = 0.5 Ω / □ (The amount of material is sufficient for 10 pipes) 4 pipes are being produced this week: 100 mm diameter, 1800 mm long pipes - 4 layers of Mylar, 25 μm thick, with 200 nm Al coating - spiral winding and gluing via 5 μm thick cross-linking polyester - 2 pieces will have an extra layer of Mylar, 36 μm thick (no Al coating) (total thickness ~170 μm) - 2 pieces without the 36 μm extra layer (total thickness ~130 μm Mylar)

17 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 The base material is the same as:

18 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Technical data

19 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Engineering drawings from Draw CodeMINMAX I.D99,7100,30 W.T0,1000,130 O.L1800,01810,0 Confidential Property of: Lamina Dielectrics Ltd, Daux Rd, Billingshurst, RH14 9SJ Tel: +44(0) Fax: +44(0) CUSTOMER:INFN PROJECT: Drawn by:PMH Approved by:DG Material: Polyester non shrink film thickness mm coated with 2,000 Angstroms of Al All dimensions in mm: Tolerances Linear:Angular: X+/- 0.5mm+/ X.X+/- 0.1mm X.XX+/- 0.05mm Unless otherwise stated on drawing DEBURR AND REMOVE ALL SHARP EDGES UNLESS STATED OTHERWISE Notes: Bond agent S Layers of film wound at half pitch all Aluminium surfaces to point to the inner bore of the tube TITLE: 100 mm internal diameter detector Drawing No.: Issue:1Date:

20 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Pictures of the pipe:

21 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Pictures of the pipe:

22 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Pictures of the pipe:

23 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Summary of default choices: Issue default choice Removal of presently used pipe Cutting and extracting it Material for the thin pipe 4 layer aluminized Mylar, < 0.8 ‰ X Geometry 2 pipes 100 mm diam, 1600 mm long Gas He, flowing at few l/h, 20 mbar overpr. End caps PET or microflange: still to be defined Fixation system Rings + wires: still to be defined

24 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Time schedule Pipe prototype production and testsNovember RICH beam pipe production: December Validation tests: January Installation: February Contingency in case of problems: March RICH operation tests with new pipeAprile

25 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011 Conclusions: The thin RICH pipe project is progressing, and problems about procurement, logistics, budget and manpower are being solved. The uncoated prototype allowed to test stiffness, gluing, He tightness. Technical solutions are being tested for end-caps and fixation system. Real RICH pipe prototypes are being produced. They will be tested in the incoming weeks. The present time schedule is compatible with installation in Feb. - March 2012

26 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 05/09/2011 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 4 layers of 25 μm thick Mylar : (0.1 mm / 287 mm) ‰ X 0 4 layers of 200 nm thick Al coating: (0.8 μm / 89 mm)0.009 ‰ X 0 1 layer of 36 μm thick Mylar: (36 μm / 287 mm) ‰ X 0 4 layers of 5 μm thick Mylar glue: (20 μm / 287 mm) ‰ X estimated total material budget for orthogonal crossing:0.552 ‰ X 0 (with respect to the goal we have a margin of 50% with the present design) The contribution from end caps, fixation rings, gas connections will be relevant For a 5 mrad particle (thickness * 200)  X 0 from the pipe, 5 x 2 mm thick nylon  (10 mm / 367 mm) = X 0 from the support rings

27 Fulvio TESSAROTTO COMPASS TB meeting, CERN, 05/09/2011 We need Accurate description of the mechanical properties of the pipe Estimate of the mechanical stresses applied to the RICH pipe Preliminary definition of the support – fixation system Computing the stresses and the deformations of the pipe (help needed!) Define the acceptable figures for the deformations (are 2 mm o.k.?) Building a testing device for the validation of the prototypes To measure the effect and validate the prototypes and the fixation system scheme