Evaluation of Proto DUNE wire tension data construction

Evaluation of Proto. DUNE wire tension data (construction site vs CERN) 05 Feb 2018 Kevin Koehler – University of Wisconsin, Physical Sciences Laboratory Presented at APA Workshop, Daresbury

Overview • Background in wire tension testing • Tension data at production site vs CERN --- US 001, US 002, UK 001 • Potential causes of differences • Next steps

Principle of tension measurement •

US-APA-001

US-APA-001 -0. 35 N -6. 99% -0. 66 N -13. 8% +0. 04 N +1. 13% -0. 21 N -3. 80%

US-APA-002

US-APA-002 -0. 24 N -4. 41% +0. 10 N +2. 31% -0. 32 N -5. 23% -0. 05 N -0. 99%

UK-APA-001

UK-APA-001 -0. 96 N -18. 7% -0. 57 N -9. 14% -0. 01 N -0. 11% -0. 34 N -0. 05%

TRENDS Difference depends on layer. More change for X and V. Less change for U and V. This is good – averages <1 N, but more work can be done to understand the differences.

Potential causes for differences • Interface frame deflects frame when measuring in winder. • APA frame sags under gravity. • Temperature stability of measurement environment.

Gravity

Interface Frame Forces

Combine them and you get:

Next Steps • FEA of frame to assess deflection – Suggested work for Ben Stillwell and Kevin Koehler • Expand test beyond zone 1 – Work with Serhan and Andrzej to improve hardware • Expand understanding of measurement error.

Backup Slides

Tension measurements at construction site

Tension measurements at CERN