HQ Coil 23 and 25 Status LARP Video Meeting September 19, 2013 Dan Cheng

HQ Coil 23 Status HQ Coil 14 has been examined – Seemed to have similar epoxy fill issues between polyimide trace layers as Coil 23 did – Coil was sectioned earlier – Traces were peeled back to examine epoxy fill of coil Coil 23 “Spot” has been cut away and examined – Does not affect the integrity of the coil in any way Instrumentation & QA on hold still, depending on decision on coil Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status2

Coil 23, Post-impregnation Outer layer, REOuter layer, straight section Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status3

Coil 23, Post-impregnation Inner layer, REInner layer, LE Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status4

Outer Layer Comparisons Coil 14 OL, Lead endCoil 23 OL, Lead end Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status5

Coil 14 Deconstruction Coil 14 IL, RE, post-impreg.Coil 14 IL, RE, trace peeled off Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status6 Despite no fill between polyimide, coil shows complete fill Kapton layer separated from trace

Coil 14 Deconstruction Coil 14 OL, end of ramp area, post-impregnation, sectioned Coil 14 OL, end of ramp area, trace peeled off Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status7

Coil 23 Inner Layer Check Inner layer, Pole gap Inner layer, pole gap, Spot cut away Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status8 Trace polyimide, with VHB backing Kapton layer, conforming to epoxy in pocket

Coil 23 Summary of Findings Based on examination of Coils 14 & 23Coil 23 IL, Return end Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status9 White areas (shown, right) are likely surface conditions only – Is not an indicator of quality of fill in the coil Coil fill is likely solid underneath the trace – Even where polyimide separated from Kapton layer – Coil structures are likely fully supported by epoxy composite If this coil passes electrical checks, this coil could be considered a usable coil

HQ Coil 25 Status Impregnation preparations will incorporate – Purchasing new CTD 101K epoxy kit (2-3 wk lead) – Revising our trace preparation procedures to improve quality of fill between layers – Revising our lead splice procedures (based on input from 8/22 QXF Coil WG meeting) Impregnation preparations can start without waiting for the changes mentioned above to be completed – But will have to be planned around HQ Coil 26 winding, etc. operations Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status10

Extra slides Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status11

Coil 14 Trace Preparations Coil 14 IL trace laminate Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status12 Film of cleaner (alcohol or acetone?) between layers

CMM Data, At 26” (660mm) Location Sept 19, 2013 D. Cheng - HQ Coil 23, 25 Status13 Coil 23Coil 20, for reference +250 µm ~ 0.010”