Daya Bay Muon Subsystem Review, 7/28-29/2007, IHEP, Beijing Muon System PMT Cable Routing Kirk McDonald Princeton University (July 28, 2007)

Daya Bay Muon Subsystem Review, 7/28-29/2007, IHEP, Beijing Cable Routes in the Daya Bay Near Hall Control room Cable tray around perimeter of water pool Cable trench between pool and control room

Daya Bay Muon Subsystem Review, 7/28-29/2007, IHEP, Beijing Issues If all PMT cables are the same length, where is the excess length stored? Inside the control room, under the false floor? On floor outside water pool, under the RPC system? How do the cables pass through the Tedlar(?) cover of the water pool? Cut hole in the cover, pass cables through, Scotch tape the gap. Build feedthrough boxes with feedthroughs in air above the cover. MiniBooNE-style feedthroughs, recently tested with RG303 cable to 25 PSI differential at Princeton. “Clam shell” variant possible as don’t need water seal. This would permit assembly of feedthroughs for cables with connectors.

Daya Bay Muon Subsystem Review, 7/28-29/2007, IHEP, Beijing Cable Routing and the Pool Cover Pool cover rolled up along this edge when retracted Cable feedthroughs along this edge only Pool cover must fit in this gap when rolled up. Example: If spool diameter is 5 cm and outer diameter of roll is 15 cm, then an 18-m-long cover must have thickness less than 0.9 mm. Cables must pass over the top of the dam and under the H-beam of the RPC support. Should build notches in the dam for the cables, and protect them with a cover plate. Pool cover runs on tracks along edges of pool