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1Fulvio 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
2Fulvio 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. = 100.1 +- 0.1, 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)
3Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
The prototypes without Al coating
4Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
The Al flanges for this test
5Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
The gluing for this test
6Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
The result
7Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
The first He leak test
8Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Temperature and pressure recording
9Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
10Fulvio 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.
11Fulvio TESSAROTTO COMPASS TB meeting, CERN, 03/02/2011
at 25 ºC and for 1 bar pressure difference,a 25 μm thick Mylar foilwith a surface of 645 cm2
leaks “typically” 150 cc/day 1 m2 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 respectTo the maximum allowed leak rate of 1l/day
For the prototype which has a surface of 0.4 m2 and no coating we would
expect a leak of ~ 40 ml/h divided by a “thickness factor”
12Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
For water vapor, the increase from 25 μmto 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
13Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
End-caps and gluing studies
14Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
microflange
15Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
microflange
16Fulvio 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)
17Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
The base material is the same as:
18Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Technical data
19Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Engineering drawings from
Draw Code MIN MAX
I.D 99,7 100,30
W.T 0,100 0,130
O.L 1800,0 1810,0
Confidential Property of:
Lamina Dielectrics Ltd, Daux Rd, Billingshurst, RH14 9SJ
Tel: +44(0) 1403 783131Fax: +44(0) 1402 782237
Email: [email protected]
CUSTOMER: INFNPROJECT: Drawn by: PMH 9.11.2011Approved by: DGMaterial:
Polyester non shrink film thickness 0.025 mm coated with 2,000 Angstroms of Al
All dimensions in mm:
Tolerances
Linear: Angular:
X +/- 0.5mm +/- 0.5 0
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 S100. 4 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.: 51.962.01
Issue: 1Date: 3.10.2011
20Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Pictures of the pipe:
21Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Pictures of the pipe:
22Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Pictures of the pipe:
23Fulvio 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
24Fulvio TESSAROTTO COMPASS TB meeting, CERN, 10/11/2011
Time schedule
Pipe prototype production and tests November
RICH beam pipe production: December
Validation tests: January
Installation: February
Contingency in case of problems: March
RICH operation tests with new pipe Aprile
25Fulvio 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
26Fulvio TESSAROTTO COMPASS TB meeting, CERN, 05/09/2011
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
4 layers of 25 μm thick Mylar : (0.1 mm / 287 mm) 0.348 ‰ X0
4 layers of 200 nm thick Al coating: (0.8 μm / 89 mm) 0.009 ‰ X0
1 layer of 36 μm thick Mylar: (36 μm / 287 mm) 0.125 ‰ X0
4 layers of 5 μm thick Mylar glue: (20 μm / 287 mm) 0.070 ‰ X0
-----------------------------------------------------------------------------------------------------------
estimated total material budget for orthogonal crossing: 0.552 ‰ X0
(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) 0.110 X0 from the pipe,
5 x 2 mm thick nylon (10 mm / 367 mm) = 0.027 X0 from the support rings
27Fulvio 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