Field Cage Mockup Status Mike Wilking Stony Brook University DUNE Engineering Meeting April 27, 2016 1
Field Cage Design Original • Work on the mockup began Design last month • We are currently assembling the original field cage design • Cross bracing I-beams were not included • For this first mockup, we are New not planning extensive tests of manipulation, mechanical Design stability, cold testing, etc. • For now, we are developing assembly procedures, QC of prefabricated parts, production of in-house machined component, etc. 2
Profiles • Currently using prefabricated stainless steel profiles • The pieces we received were pinched closed at the ends • Cut to length using a (somewhat dull) bandsaw (~1 hour for 50 profiles) • Ends we deburred with a grinding wheel, filing, and sanding (~6 hours for 50 profiles) • Goal was to remove loose pieces; endcaps can handle minor imperfections • Decision on stainless steel vs extruded aluminum in May? • If aluminum, will post-processing be necessary, or will these come cut to length? • There are concerns about scratching the profiles surfaces during assembly • Stainless steel was quite resilient; aluminum may be more delicate • In the new design, the profiles extend further from the I-beams • Some concern about mechanical deformation depending on the final material 3
I-beams • Profiles holes were cut via waterjet • In a few places, the I-beam coating began to peel, exposing the rough fiberglass surface below • All of the cut holes and I-beam ends had a similar rough surface • Filing/sanding may be an option (with a solvent to minimize dust) • Screw holes did not always line up properly due to slight twists in the I-beams and rounding in the I-beam fabrication • Some amount of filing will likely be necessary • Can tiny fiberglass shards, emitted in the LAr, cause any problems? Bad for the pumps? • Could consider coating the exposed surfaces. Epoxy? • The rough surface of the profile holes can potentially scratch profiles • We may want to consider a coating for these holes • This problem may be a larger issue for aluminum profiles 4
Component Machining • Profiles are secured to the I-beam using slipnuts • Several versions have been machined at Stony Brook with different screw sizes, thicknesses, etc. • Can we continue with 304 Stn. Stl. even with aluminum profiles? • We currently have a small number of endcaps • We are looking into machining some more • The mechanism to attach endcaps to profiles has not yet been finalized 5
Assembly Status • Initial assembly of I-beams and profiles is complete • We should soon receive additional nuts, M4 ↔ M6 screws, etc. in a few different material types (stn stl, nylon, G10?) • Different material options are under consideration • Ground planes from CERN should arrive this week 6
Next Steps • The amount we can learn from further work with the old design is limited • We hope to move to the new, 2 I-beam, design in the next few weeks • A design for the temporary manipulation frame for the 2 I-beam design is ready • We plan to begin fabricating this soon • This will allow us to begin manipulating an assembled module using the overhead crane (lifting, tilting, etc.) • Preparations are underway for the clean tent (gray room) and cold test setup • This isn’t necessary for the first few mockups that will be sent to Ash River 7
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