Warm structure requirements : https://edms.cern.ch/document/1834010 Top penetrations : https://edms.cern.ch/document/1834561   Jack Fowler | DUNE SP feed thru interfaces

Jack Fowler | DUNE SP feed thru interfaces

Interface topic – General feed thrus Pipe diameters for crossing tubes, min clear diameter. Interference with warm structure? Which feed thrus are location critical? Flange sizes. Height of warm side tube and support to warm structure where required. GAr purge port – location, size, manifold, where does it go, and what is done with it? Where are CF 63 ports required and at what specific location? Who provides the warm crossing tubes and flanges, purge ports and associated hardware, internal cryogenic piping and supports? Design responsibility? Location and tolerance expectations? Jack Fowler | DUNE SP feed thru interfaces

Interface topic - Cryogenic piping Dune is responsible, LBNF is currently working on the design. Additional CFD analysis needed? Procurement? Installation? Support from cryostat? Pump manifolds – extensions to the suction inlets for improved Ar purity. Similar to the distribution/purge manifolds. These attach to the inside of the Protego valves. Interface with cold membrane, Protego valve, and area for TPC installation. Jack Fowler | DUNE SP feed thru interfaces

Interface topic - Instrumentation Over the detector, near center line. Radioactive sources, ESH issues. Laser ports, proximity to APA and integrated into upper FC. Laser ESH issues. Design? Financial responsibilities? Jack Fowler | DUNE SP feed thru interfaces

Interface topic - Spares Preferred to have these not over the detector. But the areas at the ends are already crowded. Jack Fowler | DUNE SP feed thru interfaces

Additional feed thrus 5 additional support feed thrus needed on both the east and west ends to eliminate cantilever of the end wall loads. (total 10) This will require some movement of the HV feed thrus and one cryogenic spare. Question, will these accommodate the switchyard needed to move the TPC elements N/S in the detector. 4 additional instrumentation feed thrus near the E/W CL of detector. In line with the other instrumentation feed thrus. There may be conflict with the GAr relief feed thrus. (4 total) Add CF 63 side ports on all of the warm crossing tubes to allow for ancillary cabling, fibers and instrumentation. Laser ports near the APA plane. Proposed 16 ports skewed near east and west ends of the detector. (Total 16?) Spares – the preference for spares is to located them not over the detector volume. However, the open ends of the detector are already crowded. Jack Fowler | DUNE SP feed thru interfaces

Known initiatives We know that discussions are happening around the proposed layout For a much simpler detector support system For a laser calibration system For more spare penetrations We plan more discussions around the problem 1) and we will converge before mid November, before we sign the contract for the final engineering of the cold vessel Difficult to understand the time scale of the 2) We will add a few strategical spare penetrations in due time Jack Fowler | DUNE SP feed thru interfaces

Plan to finalize Sign off from the cryogenics and the detector in Nov 17. Changes after sign off? Approval mechanism. Jack Fowler | DUNE SP feed thru interfaces

Back ups Jack Fowler | DUNE SP feed thru interfaces

implemented since last review (end of 2016) Design modification implemented since last review (end of 2016) Opening for detector insertion: closure process defined (will be shown in installation sequence on August, 22nd) , and design adapted: Top horizontal beam sliced in 3 pieces, Warm membrane with specific reinforcement 2.6m 12.4m 2.5m Jack Fowler | DUNE SP feed thru interfaces

Integrated model cryostat and detector Jack Fowler | DUNE SP feed thru interfaces

Integrated envelope drawings Jack Fowler | DUNE SP feed thru interfaces

Positioning the TPC The main drivers for the position of the TPC inside the cryostat are: The proximity of the HV from the cryogenic piping on the west end of the cryostat. Also, the symmetry between the cryostat and TPC should be considered. The size of the LAr manifolds below the TPC and their position with respect to the CPA/HV. The installation space on the east end for translating the TPC components. Maintaining a 5% ullage. For this cryostat height, this translates to 700 mm. The liquid depth would be ~ 13300 mm. Jack Fowler | DUNE SP feed thru interfaces

APA Jack Fowler | DUNE SP feed thru interfaces

CPA and Upper/lower FC Jack Fowler | DUNE SP feed thru interfaces

End wall FC Jack Fowler | DUNE SP feed thru interfaces

Integrated Detector Jack Fowler | DUNE SP feed thru interfaces

Jack Fowler | DUNE SP feed thru interfaces

Discussion points Summary of all of the current work on the layout of the SP DUNE cryostat. SP detector envelopes – scaled from ProtoDUNE elements. Develop envelope detector drawings for integration. (B Flight) Cryostat feed thrus for detector (E Seletskaya, B Lacarelle, D Mladenov, M Nessi) Detector support – adequate to support installation rail system. Support at least every 4.8 m. Cable and electronics – one feed thru for 2 APAs, or 75 total. One electronic rack per feed thru. Cryostat feed thrus for cryogenics (D Montanari) Supply piping for liquid and cool down. Return manifolds to improve Argon purity. Detector support (V Guarino, D Wenman) Ancillary feed thrus (J Stewart) Jack Fowler | DUNE SP feed thru interfaces

Link to cryostat drawings and step file https://edms.cern.ch/document/1814480/1 Jack Fowler | DUNE SP feed thru interfaces

Jack Fowler | DUNE SP feed thru interfaces