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Status of the Composite Vacuum Chambers

Status of the Composite Vacuum Chambers. M. Gallilee, C. Garion, M. Malabaila, G. Schneider , S. Sgobba, M. Taborelli, R. Veness. Experimental Beam Pipes Materials Carbon Beam Pipe Production Design O ptions and Status Outlook. LHCb UX85/3. ATLAS.

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Status of the Composite Vacuum Chambers

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  1. Status of the Composite Vacuum Chambers M. Gallilee, C. Garion, M. Malabaila, G. Schneider, S. Sgobba, M. Taborelli, R. Veness • ExperimentalBeam Pipes • Materials • CarbonBeam Pipe Production • Design Options and Status • Outlook

  2. LHCb UX85/3

  3. G. Schneider TE/VSC ATLAS

  4. G. Schneider TE/VSC ALICE Central Beam Pipe Installation

  5. G. Schneider TE/VSC CMS HF Pipe

  6. G. Schneider TE/VSC CMS HF Pipe

  7. Beam Pipe Functionality List Vacuum Leaktightness (<10-11mbar.l/s) Bakeable (> 200 °C, ideally 300 °C) Outgassing (<10-12mbar.l/(s.cm2) Beam-surface aspects (photon, electron and ion desorptionyields) Mechanically stable for all load conditions Transparency to particles Activation Impedance Assure long-life Cost Availability

  8. Activation Courtesy R. Veness, V. Hedberg

  9. And why not Beryllium? • Brittle • High cost (several 100 000 Chf/m) • Toxicvapours when machined • Longdeliveries • Limited number of suppliers

  10. Material Options

  11. Why do wewantcarbonmaterial? … but carbon fibre composite isalso attractive 3 NothingbetterthanBeryllium…

  12. Carbon Fibre Tube (1) Carbon fibres are about 0.005 to 0.01 mm thick Severalthousand fibres twistedtogethermake a yarn Make a fabric out of the yarn Wind the fabric or yarnaround a mandrol (tube) in any angle between 0° and 90°

  13. Carbon Fibre Tube (2) Add filler material Epoxy Epoxy, tar, … Cure in an autoclave at 150 °C to 230 °C Cure at 2000 °C Carbon-Epoxy tube High Youngsmodulus (200 GPa) Max. bakeouttemperature 230 °C Outgassing not vacuum compatible Carbon-Carbon tube Good Young modulus (100 GPa) Max. bakeouttemperature no issue Outgassing vacuum compatible

  14. How to get a carbon beam pipe leak tight with high transparency?

  15. History Composite Tube developmentsat CERN in the 80’s Carbon – Epoxi tube wasinstalled in LEP experiment Total Thickness 1.24 mm Diameter 106 mm Internal aluminium liner of 0.1 mm  Enventuallyfailed, since the aluminium delaminatedfrom the carbon structure

  16. Vacuum Barrier Inside Glue aluminium liner to carbon composite tube Lookingintocompaniesinterested in the supply Lookinginto options to increase the resintemperaturestability. Current options are epoxy, polyimide, cyanite-ester Quotationexists (QinetiQ) for vapourdeposition on carbon composite samples to test leaktightness Chemical Copper layer on carbon by electroplating Test made: Not 100 % surface coverage due to « rough » surface of the windings. Corrosion due to plating bath coming out from the matrixafter the coating

  17. Vacuum Barrier Outside Carbon Tube with Vacuum BarrierOutside Advantage: Air pressure will push the liner on the carbon Disadvantage: Carbonwillbeseen by the beam Carbon Tube Liner

  18. Vacuum Barrier Outside

  19. Vacuum Barrier Outside (1) Status Outgassing tests were made on a SGL CarbonSigrabond Tube of type 2001 G diameter 104/100 mm inside a 300 mm long Titanium Grade 2 tube 0.3 mm thickwithTitanium 5 Conflatflanges. Result: The outgassing rate is about 1x10E-12mbar.l/(s.cm 2) Test temperature: 250 °C No leaks of the titaniumconflat to stainlesssteelconflatfound up to 250 °C

  20. Vacuum Barrier Outside (2) Spectrum of carbon-carbonbeam pipe in Ti-vacuum barrierafterbakeoutat 200 °C

  21. Beam Impedance Benoit Salvant BE/ABP isworking on the subject. 5 micron of aluminium coatinginside the carbon tube seems to besufficient

  22. Vacuum Barrier Material  We go for aluminium in order assure maximum transparency

  23. “Exotic Solutions” Carbon fibre aluminium composite Exists, but only in smalldimesions. Trying to findmanufacturers Honeycomb structure instead of carbon In principle the technologyexists, but weneedverythin aluminium foil on eitherside of the honeycomb and we have hightemperatures

  24. Next development steps Check how the Carbon-CarbonYoungsmoduluscanbeincreased Look for hightemperatureresins NEG coating on carbonbeam pipe Increaselength of test beam pipes to 2 m Study how beam pipe lengthcanbeincreased to 8 m Procure if possible Carbon-Aluminium tube Studyhoneycomb structure Support: 12 Studentsfrom Oxford Universitygiven 3rd yearproject to study alternatives to beryllium (M. Gallilee)

  25. Composite Chambers 5 Year Roadmap 0.3 m Alu outer vacuum barrier/Carbon-carbon with NEG 0.3 m Carbon-epoxy*/Alu liner (glued or deposited) 2m test chamber #1 Test chamber in SPS 2m test chamber #2 0.3 m Carbon-Al composite * Or otherhightemperaturepolymerlikepolyimide, cyanate-ester… Mid 2012 2014

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