SBND Design Review of TPC Wire-winding

    January 18, 2017

 Charge

SBND is setting up two production facilities for its TPC anode wire-planes, one at the Wright Lab of Yale University in US and another at the Daresbury Lab in UK.   The  facilities are aiming to produce identical wire-planes (two planes from each site) and carry necessary quality control measurements to ensure the wire-planes function well in the liquid argon environment. The Committee is to conduct a technical review on wire-winding machine designs, facility setup and tooling, fabrication procedures and QA/QC process to assess their readiness to start wire-plane productions at the two facilities.   Specially,  the review team is asked to address the following questions:

• Are the TPC anode wire-plane specifications adequately defined?  Does the wire-winding design meet the specifications?
  
• Are the  designs of the wire-winding machines and support tooling sufficiently complete to support the wire-plane fabrication, QA/QC work and transportation? 
  
• Are the QA/QC plan and procedures presented adequate to identify and mitigate technical and safety issues?
  
• Are there adequate engineering analyses performed to support the safe operation of wire-winding and QA/QC works?
• Have the key operation procedures clearly written for the wire-winding machine operation and QA/QC works?
• Have key technical, safety and schedule risks involving the wire-winding and QA/QC works captured?  Is there a plan for managing and mitigating these risks?
• Are the planned quality control measurements including cold test sufficient to identify potential TPC operation issues?
• Is the cold test procedure carefully designed to prevent adverse effect on wire-planes?
  
• Does the worker training plan for wire-winding operation and QA/QC procedures appropriate and complete?
  

If applicable, please address the design questions for US and UK facilities separately. 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.