NOvA Module Manifolds & Bottom Plates Tom Chase University of Minnesota February 2006

Overview Manifold architecture Manifold assembly Scintillator overflow containment Bottom plate Leak testing

Manifold Draft Specifications

Manifold Architecture The largest surface area part is a low-cost extrusion

Reminiscent of MINOS Side Out Manifold

Nested Manifolds

Manifold Interior

Manifold Scallop Adapter Straight slots for extruded parts Bottom has scalloped profile of main extrusion Top has profile of underside of manifold parts Enables mounting extruded manifold parts on scalloped extrusion profile Decouples extrusion & manifold: changes in extrusion affect only 1 manif part

Fiber Raceways Facilitate threading.8 mm d fibers into the optical connector Virtually eliminate registration errors Protect fibers & maintain adequate bend radii

Nominal Assembly Sequence Pre-assemble snout bottom, end cap bottom & bottom raceway to scallop adapter Install scallop adapter on main extrusion String fibers down length of extrusions Thread & pot manifold fibers Assemble snout top, end cap top & manifold extrusion Fly cut fiber ends Leak test & light test

Manifold Overflow Tank The manifold extrusion serves as the overflow tank on vertical modules

Bottom Plate Draft Specifications

Machined Bottom Plate Center channel enables fluid to flow from cell to cell Side channels prevent adhesive from clogging center channel

Injection Molded Bottom Plate Potential alternative to machining

High-Speed Module Leak Tester Pressurized air entering module can be seen as bubbles

Summary Manifold has been designed for durability, rapid assembly and low cost Raceways guide and protect fibers Base plate is similar to scallop adapter; may enable economies in manufacturing “Bubble bottle” provides potential for rapid leak testing of finished module