| Traveler Title: |
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464234 - NONE - LARP / US-HiLumi SuperConducting Cable Manufacturing Summary Traveler (QXFA)
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| Discrepancy Description: |
1. CME: One datum of CME thickness and seven data of CME keystone angle went above the upper specification limits by 0.4 micron and by <0.005�.
2. Cleanliness: from Point End (blue/red) of the bare cable to ~51st m, some wires have water spots on the surface and appear not clean. (See attachment.)
Ian Pong - 11/18/2019
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| Cause of Discrepancy: |
1. CME: Keystone angle is defined by the rollers. The out-of-spec angle data may be caused by the rollers or Turkshead installation. Thickness is adjustable. The single datum is related to measurement noise.
2. Cleanliness: fire sprinkler above the cabling machine was accidentally activated between startup run and production run. Some wire got wet and then were dried in air. The water only penetrated a couple of turns on the Al spools, so only the first ~51 m has water spots / residual marks.
Ian Pong - 11/18/2019
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| Nonconformance: |
 No |
Yes |
| Disposition:
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1. Use as-is.
2.1. Proceed to braiding and electrical QC as-is. No need to respool the cable to take sample from the hub end of the reel.
2.2. After braiding, take a 2 m sample from the affected end. Perform an inspection to determine if the residual marks are cosmetic issues / surface organic compound contamination only. If yes, there should be no impact after HT and the cable can be used as-is. If no, electrical QC on the section with residual marks will be needed to qualify cable.
Ian Pong - 11/20/2019
Disposition verify notes:
Disposition is good. Please, inform L2 after inspection of the 2m sample (step 2.2)
Giorgio Ambrosio - 11/20/2019
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| Corrective Action to Prevent Recurrence: |
1. Take the rollers out of service, re-touch, and then perform a short run to re-qualify the rollers.
2. None.
Ian Pong - 11/20/2019
Corrective Action verify notes:
OK
Giorgio Ambrosio - 11/20/2019
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| Reviewed by: |
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Date: |
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Jamie Blowers
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12/3/2019
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| Corrective Action Follow-up Notes: |
After braiding the full cable, a 2m sample was cut from the affected 51m section and shipped to LBNL for inspection and cleaning. Wiping with IPA and Ethanol did not remove the surface contamination, so the team proceeded with RRR testing to determine whether the contaminated section still meets the project minimum RRR specification (150). Strands were extracted from the same fork numbers as the production cable, heat treated, and tested per US-HiLumi Doc. 74, Appendix B. All measured samples had minor edge RRR above 240, major edge RRR above 290, and straight section RRR above 340. As all measured values pass specification, the LBNL cabling team believes that the surface contamination does not significantly impact the cable performance and that Cable P43OL1136 can be cleared for coil winding.
Ian Pong - 7/7/2020
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