Mechanical aspects of the full-scale HV test at PC4

1. Mechanical aspects of the full-scale HV test at PC4 Jeff Nelson, William & Mary HV test mini-review 7/28/16

2. A reminder on the task… • Stage 1: The goal is to model, as much as practicable, the geometry and HV of the FD and protoDUNE SP detector • Does it hold voltage? If not what are the weak points? • Stage 2: Accommodate a protoDUNE SP beam plug prototype • Hopefully the real thing… • This is Stage 2, which will be described later (Cheng Ju’s talk) • This determines the minimum size of the field cage (# of profiles) • Components much fit through the 35t cryostat’s manhole • This is smaller than a half-panel of the field cage needed for Stage 2 • Many of the parts need final assembly inside the “bottle” • The installation process inside the confined space needs careful attention since it will drive the test schedule HV test mechanical

3. This talk… • The team • Who’s doing what? • Outline the mechanical structure • Schedule overview • Outline of the installation process HV test mechanical

4. Team • Lead mechanical engineer for the HV test – Vic Guarino, PE, SE, PhD from U. Chicago (formerly of Argonne) • Many projects’ experience including SBND, Atlas, NOvA, MINOS • Lead on test detector - Jeff Nelson • Component production • CERN (ground planes, conductive surface on CPA) • BNL (end caps, SS HV profiles) • ANL (CPA assembly) • W&M, Chicago, ANL (parts) • Beam plug (BNL - See Cheng Ju’s talk) • HV cup (TBD) • HV system/delivery/ground (see Glenn’s talk) HV test mechanical

5. The object & sketch of its location/size Sits on the bottom of the Cryostat HV test mechanical

6. Plans… • Stuff arrives at W&M in September • HV profiles and end caps arrive from BNL • CPA assemblies arrives from Argonne • Ground planes arrive from CERN • Many parts are being machined at W&M (likely other shops too) • An initial low level cleaning (compressed air) • Components staged to our clean room • A test assembly at W&M with a mock of the space constraints • Ultrasound clean parts (largest possibly at FNAL) • Clean, nitrogen purge, and double bag parts at the level they will head into the cryostat at PC4 • Crate them up for shipping • Drive them out to the lab HV test mechanical

7. Overview of schedule To be added HV test mechanical

8. Assemble • The following pages describe the steps in assembling the device inside the cryostat • Initially the 7 walls are assembled • Do in reverse order of use and staged vertically at the far end of the cryostat • We are basically limited to two workers on the inside except in the earliest stages of the assembly • Workers need confined space training • First step is to put a ladder in place to for egress and to get parts lowered into the cryostat HV test mechanical

9. End wall HV assembly • These come in parts and need to be bolted up • 2 of these for each wall HV test mechanical

10. End wall HV assembly • The two half walls are bolted together HV test mechanical

11. End wall HV assembly • Insert the HV profiles • Screw in place HV test mechanical

12. End wall HV assembly Add on the other endcaps 2 of these assemblies Set these aside as they are the second to last parts installed HV test mechanical

13. Top HV wall assembly Assemble 2 half wall frames HV test mechanical

14. Top HV wall assembly Add on the stand offs for the ground plane HV test mechanical

15. Top HV wall assembly • Profiles go in the same way as the end walls • Stow these HV test mechanical

16. CPA assembly • Assemble the frame • It comes down in four parts • Dove-tail frame assembly • Corner fasteners • Slide in panel 1 on grooves • Add 3X panel connection clips • Small plates treaded from one side • Make the electrical connection • Slide in panel 2 on grooves • Last edge of frame is added • Bolt up HV test mechanical

17. CPA assembly • Add support spacers • Cross bar shown on lower left • Add hanger • See Inset • Not functional for this test but used to model the material • Socket head bolts + pins • Add edge profiles • Make electrical connections (mechanical) HV test mechanical

18. CPA assembly • Add trim strips (10X) • Green panels • 2 removed in image to see structure • Screwed into frame • Set aside inside the cryostat HV test mechanical

19. APA assembly • Assemble the (unwired) APAs • The half frames come down • Support brackets (shown later) also preinstalled • Friction pin assembly for outer frame (insert tube) HV test mechanical

20. APA assembly Set aside and repeat HV test mechanical

21. Assemble lower HV cage half walls Assemble the lower HV cage frames (1.5m x 0.8m) G10 HV test mechanical

22. Assemble lower HV cage half walls Insert the 10 stainless HV profiles and bolt in place (2 locations) HV test mechanical

23. Assemble lower HV cage half walls End caps get added to the 2nd end HV test mechanical

24. Assemble lower HV cage half walls Stow and repeat for 2nd half HV test mechanical

25. Now we start the device assembly HV test mechanical

26. Assembly steps 1) A set of feet set on the cryostat floor HV test mechanical

27. Assembly steps 2) Ground broken into 3 plates, is set on the feet 3) G10 I-beam supports bolted through the plates to feet HV test mechanical

28. Assembly steps 4) The lower HV half walls are bolted to the support I-beams HV test mechanical

29. Assembly steps APA bolts to I beam of lower HV wall HV test mechanical

30. Assembly steps CPA bolts to I beam of lower HV wall HV test mechanical

31. Assembly steps APA bolts to I beam of lower HV wall HV test mechanical

32. Assembly steps • Add the top HV cages • They bolt to APAs • Then add the top ground plane panels • Comes in 6 parts HV test mechanical

33. Assembly steps • End wall HV bolts to tabs in the APA frames HV test mechanical

34. Assembly steps • After the mechanical assembly, the HV distribution is installed (c.f. Glenn) HV test mechanical

35. Synopsis • The design has been completed part drawings are ready for machining • Long lead items (profiles, end caps, ground plane, coated cathode planes) under production • Productions plans are outlined and institutional assignments can be adjusted as if time pressure • Installation will be tricky, but will be pretested at W&M HV test mechanical

36. HV test mechanical