1. Cryostat Design Review Update Steve Kettell DUNE Collaboration Meeting – Technical Board January 14, 2016

2. Outline Overview of Review Process Cryostat review charge & agenda CERN procurement schedule ProtoDUNE cryostat interfaces & schedule Recommendations Plan forward 2Kettell | DUNE Technical Board14-JAN-16 ProtoDUNE Cryostat Design Review December 17-18, 2015 FNAL

3. Overview of Review Process 3 Schedule is being updated (emphasis on ProtoDUNE)  Elaborate ProtoDUNE SP (NP04) construction and installation plan  Develop QA plans and incorporate into schedule  Reconcile with EHN1 and ProtoDUNE DP (WA105/NP02) schedules. How fast can we go? Are we limited by $$$ or manpower? Current Review plan  ProtoDUNE cryostat Dec 17-18 2015  ProtoDUNE Cryogenic system?  TPC (APA, Field Cage, Cathode/HV, Photon, electronics, DAQ, Installation) March-June 2016  Production Readiness reviews Fall 2016 Kettell | DUNE Technical Board14-JAN-16

4. Cryostat Review: Overview 4 LBNF/DUNE Management Review of ProtoDUNE Cryostat Design Review (called by LBNF/DUNE management team) Charge: The DUNE collaboration plans a large single-phase LArTPC detector prototype (ProtoDUNE-sp) to be installed in the new EHN1 building at CERN. CERN is providing a cryostat in which the detector will be placed. An engineering design contract for the membrane cryostat will be placed in early 2016 in advance of the procurement and construction of the cryostat later in 2016. Kettell | DUNE Technical Board14-JAN-16

5. Review Committee Members 5Kettell | DUNE Technical Board14-JAN-16 Gina Rameika (chair), Fermilab Linda Bagby, Fermilab Olga Beltramello, CERN Dmitri Denisov, Fermilab Michael Geynisman, Fermilab Vic Guarino, University of Chicago Cat James, Fermilab Russ Rucinski (ex-officio), Fermilab Terry Shaw (ex-officio), Fermilab Craig Thorn, Brookhaven National Laboratory Terry Tope, Fermilab

6. Committee Charge 6Kettell | DUNE Technical Board14-JAN-16 Is the ProtoDUNE cryostat detailed final design sufficient for the anticipated procurement? Have the cryogenics systems and their interface to the cryostat, including internal, proximity and external piping, pumps, control and monitoring equipment and purification plans been taken into account? Have the feedthroughs and their interfaces to the cryostat, including APA signal and voltage, photon detector signal and voltage, calibration and CPA high voltage been taken into account? Has the beam interface to the cryostat, including window penetrations been taken into account? Is the cryostat installation plan and sequencing and interfaces to the cryostat, including access hatches, support rails and associated safety requirements sufficiently understood and planned? Has the design included the preliminary grounding and shielding plan and its interfaces to the cryostat, including grounding issues specific to EHN1? Does the cryostat design accommodate the detector design and its interfaces to the cryostat, including support of the TPC and installation of the TPC into the cryostat?

7. Review Agenda 7Kettell | DUNE Technical Board14-JAN-16

8. Single-Phase ProtoDUNE – CERN Cryostat Strategy Finish preliminary design Get structural analysis approved for warm vessel Get preliminary engineering requirements of the cold vessel Final design of the warm vessel Tender warm vessel Final engineering of the cold vessel Prepare the technical specifications for cold vessel Preassemble warm vessels (before August 2016) After EHN1 beneficial occupancy install warm vessel Leak test warm vessel Install clean room Order insulation material + membranes Install membranes + insulation Leak test cold vessel Install TPC (4 months) Close TCO (few weeks) Cool down + filling 14-JAN-16Kettell | DUNE Technical Board8 (M. Nessi)

9. Cryostat Production Readiness Review Results 1-1/2 day review Committee report posted (today’s Indico page) Report includes Findings, Comments & Recommendations for each area of review Overview/Execution Strategy Cryostat Structure Membrane Cryostat Interfaces: Cryogenics, TPC, Feedthrough, Beam Window Grounding Plan Integration & Installation  23 Recommendations total (see backup summary) Answers to Charge Questions conclude that additional design is needed before procurement of cryostat material 14-JAN-16Kettell | DUNE Technical Board9

10. Recommendation Summary 10Kettell | DUNE Technical Board14-JAN-16 Warm Structure – 10 recommendations; resolution required prior to procurement Membrane Cryostat – 2 recommendations; resolution required prior to final design Systems Integration & Engineering – 3 recommendations; resolution required by March 31, 2016 Cryogenic Systems – 3 recommendations Detector – 5 recommendations

11. Follow-up Actions – Cryostat Design Review 11Kettell | DUNE Technical Board14-JAN-16 Warm Structure, Membrane Cryostat & Cryogenic  Establish DUNE/ProtoDUNE integration meetings to resolve interface issues with CERN & LBNF Beam Window – need work to satisfy safety, engineering & physics requirements  Cryostat interface  Field cage interface Grounding & Shielding Plan  In development; presentation to February Technical Board meeting Developing processes to approve requirements, design, interface documents Additional interface milestones to be added to schedule

12. Next Steps 12Kettell | DUNE Technical Board14-JAN-16 Organize new ProtoDUNE management team Build synergies (technical and managerial) between ProtoDUNE SP(NP04) and DP (NP02) efforts Assign ownership to each recommendation Establish process for internal recommendation tracking Continue to refine & update ProtoDUNE schedule  Include design review milestones  Explore options to advance schedule  Establish QA/testing plans  Verify additional cost and manpower availability  Integrate ProtoDUNE schedule with EHN1 schedule Build up ProtoDUNE technical design team Flesh out design/model/drawing integration & approval process Bring onboard additional collaboration scientific effort

13. TechBoard Actions 13Kettell | DUNE Technical Board14-JAN-16 No specific request to TechBoard at this time Comments on Cryostat Review and response are requested As management response to Cryostat Review is finalized, this may come back to the TechBoard Expect briefings on future design reviews, with several over the next several months

14. Summary 14Kettell | DUNE Technical Board14-JAN-16 We have completed our first internal ProtoDUNE review Many thanks to the review committee Many useful recommendations Expect several more reviews this Spring-Fall.  Advance to final design this spring  Aim for production start later this year

15. Backup 15Kettell | DUNE Technical Board14-JAN-16

16. Detailed list of penetrations 16Kettell | DUNE Technical Board14-JAN-16 Detector Penetrations - roof: West TPC translation suspension: N. 3,crossing tube diameter200 mm Center TPC translation suspension:N. 3,crossing tube diameter150 mm East TPC translation suspension: N. 3,crossing tube diameter150 mm Signal cable chimney FTs: N. 8,crossing tube diameter250 mm Spare on Signal cable row FTs: N. 2,crossing tube diameter250 mm Laser FTs: N. 4,crossing tube diameter155 mm Calibration Fiber CPA FT: N. 1,crossing tube diameter150 mm Spare on CPA line FTs: N. 2,crossing tube diameter150 mm HV FT: N. 1,crossing tube diameter159 mm Manhole: N. 2,crossing tube diameter609 mm Angled beam windows – west side: N. 3,crossing tube diameter300 mm TCO – west side:1372mm x 7900 mm Cryogenic pipes - roof: N. 5,crossing tube diameter304 mm N. 5,crossing tube diameter152 mm N. 1, crossing tube diameter125 mm N. 3, crossing tube diameter250 mm Cryogenic pipes – north side: N. 1,crossing tube diameter168 mm

17. Recommendations 17Kettell | DUNE Technical Board14-JAN-16 #RecommendationSystemOwner 1A seismic analysis should be done on the structure. Cryostat StructureNessi 2The plan for insuring that the load on the bottom frame should be presented. In particular, if the floor is uneven it should be shown how the load be evenly distributed. It should be shown that the localized forces on the concrete at each floor support under every loading condition is acceptable. Cryostat StructureNessi 3Document the expected deformation of the warm structure on all six sides for the condition of initial start-up (empty but with 350 mbar pressure) and also when full of liquid. Is the floor concave up or concave down and to what extent? Communicate the expected deflections to GTT and to the cryogenics group responsible for the piping running across the floor. Determine the floor loading for these conditions and check that it does not exceed the allowable loading on the concrete floor. Membrane Cryostat Nessi 4Perform a check to determine if the cryostat wants to lift under any circumstances, for instance if the cryostat is empty and pressurized at 350 mbar. Membrane Cryostat Nessi 5Work with the CERN HSC to determine to what pressure the empty cryostat is allowed to be pressurized. Confirm with the cryogenics group that the allowed pressure is sufficient to perform all operations leading up to a full cryostat. Membrane Cryostat Nessi

18. Recommendations 18Kettell | DUNE Technical Board14-JAN-16 #RecommendationSystemOwner 6There should be a unified process for approving design, requirement, and interface documents between institutions leading different parts of the project. CryogenicStewart 7The design, fabrication, testing and installation of the detector should be consistent with the signed MOU (EDMS 1554082), or a resolution of differences in testing procedures between CERN and Fermilab should be resolved. CryogenicNessi 8The cryostat should be protected from overpressure for all modes of operations, including the initial commissioning modes when the cryostat volume is occupied only by gas. If a special relief arrangement must be made, the cryogenic system should be properly changed. CryogenicMontanari 9The bottom side penetration should be finalized, both from engineering and safety stand point. If Protego© valve is used, its incorporation into cryostat should be detailed for heat leaks and thermal expansion issues. CryogenicMontanari 10The solution for installation of the liquid argon pumps should be finalized (submersible versus inline). CryogenicMontanari 11Develop realistic requirements (derived from reasonable requirements on performance) for the tolerance on the relative positions of APAs, CPAs, FCPs, and the absolute position of the entire TPC within the external cryostat structure. TPCStewart

19. Recommendations 19Kettell | DUNE Technical Board14-JAN-16 #RecommendationSystemOwner 12Do not use lubricants (in bearings) inside the cryostat.TPCPaulos / Fowler 13An analysis of the benefits and costs of cold feedthroughs should be made.Feedthrough 14The Beam delivery group, ProtoDUNE scientists, cryogenic engineers and designers of the ProtDUNE detector should work closely together to optimize (and hopefully simplify) the design of the beam window penetration. Reduction in the number of penetrations and softening specifications on the beam parameters should be considered with the goal to accomplish critical measurements planned for the protoDUNE program. Beam Window 15Establish a process to understand the inter-connections and verify all pieces of metal associated with the cryostat, outer warm I-beam frame, primary Al foil, secondary membrane, and top plate, are grounded in a suitable manner. GroundingShaw 16Establish a mechanism for reviewing detector group grounding plans.GroundingShaw / Stewart 17The cryostat penetrations and interfaces, especially the ones from sub- detectors, should be frozen in very near future in order to be able to proceed with the specifications of cryostat warm structure, insulation and cryogenics. They should be done within 2 months to be ready to issue specifications for GTT contract and the final detailed design of the cryostat warm structure. The design requirements for Cryogenics should be finalized by April 2016. Integration/ Installation Stewart / Nessi

20. Recommendations 20Kettell | DUNE Technical Board14-JAN-16 #RecommendationSystemOwner 18All of the sub systems attached to the warm structure should address interface loading conditions for all possible scenarios (wet or dry, and installation scenarios), in order to make sure that these loads are not impacting the final detailed design of the cryostat warm structure. Integration/ Installation Stewart / Nessi 19Design calculations of the sub-detectors supporting structures should be provided, for running scenario (full) as well as for all phases of installation. Integration/ Installation Nessi 20A configuration control process should be implemented. In particular, an integration /envelope (tolerances) study should be performed, especially about the integration and support of the beam insertion pipes but also for other possible interferences, e.g. between lasers and detector structures. The beam window design team should get in contact with the CERN study team for the beam penetrations as they have some complementary technical solutions to propose. Integration/ Installation Stewart / Dolph 21The current schedule calls for the sub-detector components to be ready for installation by the end of 2017. A detailed schedule for all sub-systems together with the relevant milestones should be. Integration/ Installation Stewart 22Compatibility between sub-detectors, cryostats, cryogenics and infrastructure schedule should be checked. Integration/ Installation Stewart