Dubna straw status
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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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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


6 sep 14

Common view

6-Sep-14

S.Movchan Straw manufacturing and QC

2


6 sep 14

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


6 sep 14

806 straws

~100 straws/spool

6-Sep-14

S.Movchan Straw manufacturing and QC

4


6 sep 14

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 sep 14

806 straws

BLUE– straw start

RED – straw end

Each bin=25 straws

6-Sep-14

S.Movchan Straw manufacturing and QC

6


6 sep 14

806 straws

BLUE– straw start

RED – straw end

D av = 9.78 mm

6-Sep-14

S.Movchan Straw manufacturing and QC

7


Tensile tests

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


6 sep 14

BLUE– straw start

RED – straw end

Min =

1 mm

806 straws

6-Sep-14

S.Movchan Straw manufacturing and QC

9


6 sep 14

BLUE– straw start

RED – straw end

806 straws

dL av = 7.0 mm

6-Sep-14

S.Movchan Straw manufacturing and QC

10


6 sep 14

806 straws

BLUE– straw start

RED – straw end

6-Sep-14

S.Movchan Straw manufacturing and QC

11


6 sep 14

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


6 sep 14

806 straws

R av = 61.8 Ohm

(L=2600 mm)

6-Sep-14

S.Movchan Straw manufacturing and QC

13


6 sep 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


6 sep 14

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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