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Outlook

TCSP and TCAPD: Status of EN/MME production Collimation Working Group 03.02.2014 F. Carra , A . Bertarelli, A. Dallocchio , M. Garlasché, L . Gentini, I. Sexton … and many other people working on these projects. Outlook. TCAPD production TCSP production Status Vacuum issues Conclusions.

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Outlook

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  1. TCSP and TCAPD:Status of EN/MME productionCollimation Working Group 03.02.2014F. Carra, A. Bertarelli, A. Dallocchio, M. Garlasché, L. Gentini, I. Sexton…and many other people working on these projects F. Carra – EN-MME

  2. Outlook • TCAPD production • TCSP production • Status • Vacuum issues • Conclusions F. Carra – EN-MME

  3. TCAPD Production • First planning: deliver two TCAPDs toEN/STI by the end of 2013 • 2 months of delay in the raw material (copper) procurement, almost entirely absorbed thanks to a crash program • Two TCAPDs completed on 16th January 2014, including: • Machining • EB welding • Metrology • Final mechanical assembly of the support structures (ancillary supports included) • TCAPDs transported to b. 272 (EN/STI) for the final tests (bake-out, vacuum, etc.) F. Carra – EN-MME

  4. TCAPD Production F. Carra – EN-MME

  5. TCSP Production • 3 TCSP collimators to be produced (2 to be installed + 1 spare) • Delays for the production coming from BPM cables. High outgassing rate due to cracks in the weldings between cables and connectors (discovered in December 2011) • Problem solved by the supplier with the help of CERN material and welding experts, but TCSP cables shipped to CERN only in July 2013 and provided to EN/MME after testing in September 2013! • Collimators ready for EN/STI on the third week of November, thanks to a big effort from all the people involved! • EN/STI final operations and bake-out completed by mid-January F. Carra – EN-MME

  6. TCSP Production F. Carra – EN-MME

  7. TCSP Production • Vacuum issues • 2 TCSP tested after bake-out: both are vacuum-tight and without contamination • Outgassing test: the first is compliant with LHC specification, the second one is above the outgassing limit and cannot be installed as it is • The test has been repeated three times, and the results are confirmed, even if the outgassing rate has decreased each time • According vacuum experts, this could be due to internal leaks: it can be related to the connection BPM cables / flange (absence of outgassing hole in the connector) F. Carra – EN-MME

  8. TCSP Production • What’s next? • The third TCSP is now being vacuum-tested, to possibly replace the second one: results expected by the end of week 6. A BPM flange had to be replaced because it was leaking! (2nd time we find a leaking BPM flange…) • In parallel, vacuum tests on TCSP n. 2 are going on (to assess if the outgassing be related to the BPM connections with the flange) • Can we think about a long pumping and bake-out cycle (or multiple bake-outs) to decrease the outgassing down to LHC specification? • The problem of trapped air inside the BPM connector has to be taken into account also for the TCTP series! • Proposal: electro-erosion cutting on BPM connector F. Carra – EN-MME

  9. Conclusions • TCAPD: machined, delivered and currently under bake-out and vacuum tests • TCSP: • Machined, delivered to EN/STI, vacuum-tested • TCSP n. 1 OK, TCSP n. 2 outside LHC specification, TCSP n. 3 (spare) under testing • Tests on TCSP n. 2 ongoing to understand the origin of the problem and proposals to cope with it under examination F. Carra – EN-MME

  10. Thank you for your attention! F. Carra – EN-MME

  11. Backup slides F. Carra – EN-MME

  12. Ongoing EN/MME activities on collimators • Actuation system: • New cycling tests on movable tables with more realistic cycle • Analyses on the failures of SKF roller screws • Qualification of a new actuation system (hybrid steel/ceramic ball screws – UMBRA) • Advanced materials: sistemarle • Tests in Eucard2 WP11 • Design of TCSx • HiRadMat2 • Analyses of HiRadMat1 results • BBLRC • Preparation of Phase II prototype for impedance measurements • TCTP proto • TCLD? F. Carra – EN-MME

  13. Tests on alternative coatings • The black coating used for radio tube anodes has been taken in consideration: • Very high emissivity, measured with the thermal camera: 0.9 • Even more volatile surface than CrO, easily detachable by hand! F. Carra – EN-MME

  14. Tests on black chrome • Outgassing tests of the black chrome have been performed by G. Cattenoz (EDMS n.1213905): • High outgassing rates, but within the limits for LHC vacuum • Dusty surface (risk of particles detachment) • A SEM observation was performed by N. Jimenez Mena to compare morphology and porosity of Black Chrome and Graphite (EDMS n. 1220547). “The Cr coating shows many cracks and some inhomogeinities on the surface. However, the porosity and discontinuities in the graphite reference seem to be higher.” Black Chrome Graphite F. Carra – EN-MME

  15. Thermal simulations: results • Results showed in slide 7 have been updated with the realistic inputs presented by H. Day (no safety factor considered in this case) To be divided by 2 to evaluatepower on each ferrite array F. Carra – EN-MME

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