SP Far Detector Anode Panel, Cathode Panel, and Field Cage V. Guarino February 5, 2018
SP Far Detector • Give an over view of DSS Design and APA Gaps • Overview of Integration Model • Areas where we need feedback from APA Consortium 2
Current Status of DSS Design and FD Integration • Feedthrough positions in cryostat have been fixed • Preliminary DSS design has been completed. See DocDb 6311 paper for description and Appendix for detailed analysis • Proto-DUNE models of the CPA/FC/Endwall have all been adjusted for the FD geometry. • An APA model has been created as a placeholder based on frame and electronic box dimensions from PSL • Model of Full Detector has been created and is integrated with DSS and cryostat (see Docdb 6260) • Focus of Detector modeling has been on integration in cryostat, DSS design, and installation. • DSS/CPA/FC/Endwall model all modeled in Inventor so integration easy • Need to work out details of APA/FC Interfaces 3
DSS Overview – Feed Throughs Pitch of supports unfortunately does not match the pitch of the APAs APA/CPA supported on • beams 6.4m long with supports spaced at 4.8m Spacing and length are • optimized to minimize # of feedthroughs and size of beam
DSS Overview The DSS provides support to the detector from the warm vessel Feedthroughs that provide Support to the warm structure Hanging rods that support Beams and allow lateral motion 4.8m 6.4m Boundary between beams
DUNE Far Detector Completed Panel Transportation Completed Panels are shuttled to their proper row on the DSS and ferried into place inside the Cryostat CPA Panel APA Panel FC Panel 6
DSS – Shuttle Beam A pair of north-south beams will be installed on the east end of cryostat. • A shuttle beam will transverse these beams to deliver CPA/APAs to the correct position. • N-S beams get removed after installation. • Shuttle beam remains in place to support the endwall • Designing a driven trolley for Shuttle Beam and installing APA • Get removed after installation Shuttle Beam Remains in place to support last APA and Endwall
APA Gaps During Cool Down • Shrinkage can be accommodated in two ways: • The DSS beam can be continuous from the APA Boundary Gap (mm) center of the detector to the end of the detector; the beam would shrink toward the End -1.40624 center and no gaps develop. 1 to 2 0 2 to 3 11.0976 • Requires DSS supports to accommodate 80mm of 3 to 4 0 movement at the ends, the entire detector 4 to 5 0 shrinks/moves 5 to 6 17.408 • The DSS beams can be segmented. Gaps open 6 to 7 0 up between APA. 7 to 8 0 8 to 9 17.408 • There is less movement of detector and DSS 9 to 10 0 supports accommodate a small shrinkage 10 to 11 17.408 11 to 12 0 • A current DSS design uses beams that are 12 to 13 0 6.4m long, which support typically 3 APAs. 13 to 14 17.408 This design results in a zero gap 14 to 15 0 15 to 16 0 developing between the three APA’s on 16 to 17 17.408 the same beam but a 17mm gap opening 17 to 18 0 18 to 19 0 up between adjacent APA’s that are on 19 to 20 17.408 separate beam. Roughly there will be a 20 to 21 0 17mm gap between every 3 rd and 4 th APA. 21 to 22 0 22 to 23 17.408 23 to 24 0 • See DocDb 6011 for details and list of gaps 24 to 25 17.408 Far End of 25 2.49424
SP FD Integration • Drawings/3D PDF/STP files have been made of assembled detector • See DocDb 6260 • Need to resolve: • Height of APA relative to FC • APA/FC latches • Yoke design and mounting points 9
SP FD Integration • Detailed drawing of the detector in the cryostat 10
SP FD Integration 11
SP FD Integration 12
SP FD Integration • Currently have only placeholders for electronic boxes and APA length 13
Ongoing Work • DSS Design is well developed. • Vertical Position of detector in cryostat needs to be finalized • Trolleys/mounts of CPA/APA need to be finalized (will be based on proto-Dune designs) • Is yoke design finalized? • Currently working on APA/Endwall interface • Re-examine APA/FC latches • Long term – keep integration model updated to reflect current design 14
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