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Instrumentation Trace Material Selection

Instrumentation Trace Material Selection. D. Cheng Sept 23, 2013. Outline. Current LARP trace production Issues experienced Other materials available. LARP Coil Instrumentation. *Modified cross-linked epoxy system, AS 1084 *** Joined by single strip of 3M VHB F-9460PC.

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Instrumentation Trace Material Selection

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  1. Instrumentation Trace Material Selection D. Cheng Sept 23, 2013

  2. Outline • Current LARP trace production • Issues experienced • Other materials available D. Cheng

  3. LARP Coil Instrumentation *Modified cross-linked epoxy system, AS 1084 *** Joined by single strip of 3M VHB F-9460PC D. Cheng

  4. Instrumentation Trace Fabrication Process • Design and print artwork (negative mask) • Cut trace laminated material to length • Cover conductive laminate with resist • Expose resist under negative mask with UV light • Wash the uncured resist from laminate • Etch laminated material with cured resist pattern • Conductive layer covered by resist remains • Remaining resist washed off by stripping agent D. Cheng

  5. Instrumentation Trace Impreg. Preparations • Electrical QA • Bond additional layer of Kapton • 25 µm (earlier iterations) • 50 µm (current) • Perforate polyimide layers • Install during coil impregnation D. Cheng

  6. Experiences with Traces During Coil Fabrication • “Pinholes” have caused electrical failures • A few were caused by materials • Some were caused by the handling • Additional layers (25 µm or 50 µm) of Kapton were added for protection • Some laminated traces did not fully impregnate D. Cheng

  7. Pinholes Material flaw (inclusion) that caused a hipot failure during electrical QA D. Cheng

  8. Impregnation Between Polyimide Layers Coil 14 OL, end of ramp area, post-impregnation, sectioned Coil 14 OL, end of ramp area, trace peeled off Lack of fill between layers Coil itself shows good impregnation D. Cheng

  9. Potential Heater/Instrumentation Materials • Current trace designs specify 50 µm thick polyimide backing, therefore the following options exist: *Modified cross-linked epoxy system, AS 1084 **Apical AV is similar in thermal conductivity as Kapton HN (0.19 W/mK) D. Cheng

  10. Materials Options Summary D. Cheng

  11. Additional Slides D. Cheng

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