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Meeting summary (so far, Monday morning) and comments

Tom Peterson, Camille Ginsburg (FNAL ), Alex Ratti (LBNL) Crab Cavity Meeting, CERN, 1-6 Aug 2013. Meeting summary (so far, Monday morning) and comments. CERN services and capabilities – visits. M ain workshop and metrology (building 100) – Said Atieh

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Meeting summary (so far, Monday morning) and comments

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  1. Tom Peterson, Camille Ginsburg (FNAL), Alex Ratti (LBNL)Crab Cavity Meeting, CERN, 1-6 Aug 2013 Meeting summary (so far, Monday morning) and comments

  2. CERN services and capabilities – visits • Main workshop and metrology (building 100) – Said Atieh • Surface treatment infrastructure (building 118) and sputtering infrastructure (building 252) – Sergio Calatroni • Metallurgy and non-destructive testing (building 599) – Gonzalo ArnauIzquierdo, Ignacio Aviles Santillana • Vacuum brazing and new E-beam welding machine (building 112) – Said Atieh • Cryo-bypass for LHC collimators (building 112) –Said Atieh, Thierry Renaglia LHC Crab Cavities, 5 Aug 2013

  3. CERN services and capabilities – more • SM18 (RF test caves, vertical dewars, magnet test facility) – Mathieu Therasse, TorstenKoettig • Mechanical measurements lab (building 376) – Michael Guinchard (CERN) • SMI2 (magnet assembly and staging area, SPL cavity support structure mock-up) – Arnaud VandeCraen, RossanaBonomi, Michael Guinchard • In summary: truly remarkable fabrication and measurement capabilities, most impressive, and very knowledgeable personnel LHC Crab Cavities, 5 Aug 2013

  4. SM18 • Cleanroom areas • Cryomodule assembly areas • Vertical dewar test cryostats • Test caves with cryogenics capable of hosting a full cryostat test including the service module prior to installation into SPS LHC Crab Cavities, 5 Aug 2013

  5. LHC Crab Cavities, 5 Aug 2013

  6. LHC Crab Cavities, 5 Aug 2013

  7. SPL cryomodule – RossanaBonomi, Arnaud VandeCraen • Several novel features are being studied • Support via a double-walled tube through which is placed the input coupler • Input coupler then precisely at the cavity fixed-point • Other cavity end supported by bridge to the next cavity • Round vacuum vessel but opens via top lid, long O-ring seal LHC Crab Cavities, 5 Aug 2013

  8. LHC Crab Cavities, 5 Aug 2013

  9. Alignment systems – optical (HEI-ISOLDE) LHC Crab Cavities, 5 Aug 2013

  10. Alignment systems – stretched wire (SPL) LHC Crab Cavities, 5 Aug 2013

  11. CERN Cryomodule Requirements for Crab Cavities – O. Capatina (CERN) • This talk by Ofelia provides a good overview of the constraints and requirements • Key document is still the Functional Specification LHC Crab Cavities, 5 Aug 2013

  12. Crab Cavity Interfaces LHC Crab Cavities, 5 Aug 2013

  13. Various key constraints have been identified LHC Crab Cavities, 5 Aug 2013

  14. SPS cryogenics – Krzysztof Brodzinski LHC Crab Cavities, 5 Aug 2013

  15. Discussion, possible modifications • Supply bypass (4.5 K) around heat exchanger • Cool-down return via heat exchanger and pumping line (up to cool-down branch) • Optional 4.5 K supply to manifold below cryostats for warm-up and cool-down, to be determined based on operational requirements LHC Crab Cavities, 5 Aug 2013

  16. Crab Cavity Compliance Requirements LHC Crab Cavities, 5 Aug 2013

  17. ASME options • ASME pressure vessel code, Section VIII for pressure vessels, has two major divisions • Section VIII, Div 1 is design by rules, most formulas provided although there is some freedom where none apply • Section VIII, Div 2, is design by analysis LHC Crab Cavities, 5 Aug 2013

  18. Fermilab’s SRF pressure vessel standard LHC Crab Cavities, 5 Aug 2013

  19. Safety compliance conclusion • As a top priority in this project, we will work closely with CERN’s EN/MME Design Office Team to satisfy CERN safety requirements • In detailed follow-up discussions on this topic, we can provide more information about our standards (ASME and our SRF cavity vessel standard), as those may also help to reach a detailed understanding of requirements here LHC Crab Cavities, 5 Aug 2013

  20. Cryomodule for UK 4Rod cavity – Thomas Jones, ShrikantPattalwar (STFC Daresbury Laboratory, UK) • Nice conceptual design of dressed cavity and cryomodule including structure LHC Crab Cavities, 5 Aug 2013

  21. LHC Crab Cavities, 5 Aug 2013

  22. Present direction for cryostat work • With three cavity options • Daresbury continues their design for their cavity • US effort looks at common elements for our two cavities, also taking as much as possible from CERN and Daresbury cryostat design work • Funding to continue with all three cavities may not be available. If one US cavity is selected for inclusion in a cryostat, US will focus on that design • If Daresbury cavity is not continued, we will focus on one US cavity while Daresbury works with the other • US support is, unfortunately, still rather uncertain • Hope to have a designer this fall who will assist with CAD modeling details LHC Crab Cavities, 5 Aug 2013

  23. Cryomodule assembly • CERN is certainly capable of doing full cryomodule assembly • So is Fermilab • Let’s see what support Fermilab receives over the next 4 months and prospects for funding beyond that to assess whether assembly at Fermilab remains an option LHC Crab Cavities, 5 Aug 2013

  24. Conclusions (as of Monday morning!) • Excellent meeting, well organized, very informative • This collaboration definitely has the expertise and infrastructure to accomplish the task of building a crab cavity cryomodule for tests in SPS • Although we all recognize that the funding is uncertain and the schedule for installation into SPS is very ambitious • Close coordination for best use of our resources will be very important • Among our next tasks should be to define the dressed cavity safety compliance requirements, since those may move to advanced design stages soon • Niowave will focus on dressed cavity design and construction initially for their SBIR • We need to ensure that those first dressed cavities satisfy all requirements including documentation LHC Crab Cavities, 5 Aug 2013

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