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6-Sep-14

Dubna straw status ( 27 /04/2011) introduction straw parameters conclusion Presented by V. Elsha S.Movchan. 6-Sep-14. S.Movchan Straw manufacturing and QC. 1. Common view. 6-Sep-14. S.Movchan Straw manufacturing and QC. 2. Storage area inside clean room.

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6-Sep-14

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  1. Dubna straw status (27/04/2011) • introduction • straw parameters • conclusion • Presented by V. Elsha • S.Movchan 6-Sep-14 S.Movchan Straw manufacturing and QC 1

  2. Common view 6-Sep-14 S.Movchan Straw manufacturing and QC 2

  3. Storage area inside clean room Tray for 36 straws Straw manufactured - 806 pc Average rate – 20 straws/shift ~ 100 straws per spool (L=300 m) (nominal JINR straw L=2700 mm) 6-Sep-14 S.Movchan Straw manufacturing and QC 3

  4. 806 straws ~100 straws/spool 6-Sep-14 S.Movchan Straw manufacturing and QC 4

  5. 806 straws: measurement results Straw parameters: - diameter - elongation - ultrasonic track width (“seam”) - resistance (all results are presented (averaged) with bin=25 straws) Straw rejection 6-Sep-14 S.Movchan Straw manufacturing and QC 5

  6. 806 straws BLUE– straw start RED – straw end Each bin=25 straws 6-Sep-14 S.Movchan Straw manufacturing and QC 6

  7. 806 straws BLUE– straw start RED – straw end D av = 9.78 mm 6-Sep-14 S.Movchan Straw manufacturing and QC 7

  8. Tensile tests 6 samples from Sefar September 2 samples from Sefar December and 2 samples from JINR January S2 S1 R2 R1 1bis 1 3 2 4 5 Inelastic elongation: start from dL ≥ 0.5 mm Straw acceptance limit: dL ≥ 1.0 mm

  9. BLUE– straw start RED – straw end Min = 1 mm 806 straws 6-Sep-14 S.Movchan Straw manufacturing and QC 9

  10. BLUE– straw start RED – straw end 806 straws dL av = 7.0 mm 6-Sep-14 S.Movchan Straw manufacturing and QC 10

  11. 806 straws BLUE– straw start RED – straw end 6-Sep-14 S.Movchan Straw manufacturing and QC 11

  12. 806 straws: visible trackwidth (track fromultrasonic head on straw) BLUE– straw start RED – straw end W av = 0.725 mm 6-Sep-14 S.Movchan Straw manufacturing and QC 12

  13. 806 straws R av = 61.8 Ohm (L=2600 mm) 6-Sep-14 S.Movchan Straw manufacturing and QC 13

  14. 806 straws Straws rejection (out of parameter specification): diameter out of specification D=(9.75-9.80) mm – ~ 0.4% ( 3 straws) seam width less than W=0.4 mm – ~ 0.4% ( 3 straws) elongation less than 1 mm – ~ 2.5% (20 straws) ~ 3.3%(26 straws) 6-Sep-14 S.Movchan Straw manufacturing and QC 14

  15. Conclusion 806 straws were manufactured (February-April 2011): ~20 straws/shift ~ 100 straws per spool (L=300 m). Efficiency of mylar tape used is about 90% Straw parameters: - diameter Dav = 9.78 mm - sample elongation dLav= 7.0 mm (o-ring 5 mm width tensile test) - visible ultrasonic track width Wav=0.725 mm - resistance Rav=61.8 Ohm (L=2600 mm) Straws rejection (out of parameter specification): ~ 3.3%(26 straws) Dubna straw quality is adequate to NA62 requirements 6-Sep-14 S.Movchan Straw manufacturing and QC 15

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