SBND Design Review of PMT Integration 

    Nov 18, 2016

 Charge

SBND plans to deploy cryogenics PMTs from Hamamastu to detect scintillation lights from neutrino interaction in the liquid argon.  The PMT tubes are to be mounted behind the TPC wire-planes to collect  the vacuum ultraviolet (VUV) light produced in the TPC drift volume.   The high voltage and signal cables are routed through cryostat feed-through ports before reaching the high voltage power supplies and CANE electronics in the detector building. The Committee is to conduct a technical design review of the subsystem including PMT surface coating treatment, PMT mounting support,  HV divider circuit, signal calibration, cold cables and cryostat feed-through.  Specially,  the review team is asked to address the following questions:

• Are the technical specifications adequately defined?  Does the design meet the specifications?
• Is the design sufficiently complete to support the safe handling and installation of PMTs during assembly and transportation?
  
• Are there adequate engineering analyses performed to support the design?
• Are key interface and integration issues to TPC and cryostat identified and adequately addressed?
• Does the design of cabling and feed-through meet SBND electronics safety and grounding standard?
  
• Are the planned quality control measurements including PMT cold test sufficient to identify potential performance issues? 
• Is the design present sufficient enough to support the start of PMT support and cabling component fabrication?

The committee should present its findings, comments, and recommendations as well as answers to the above questions in a written report within 2 weeks of the actual review.