1. S.Movchan Straw manufacturing and QC
Test results of criteria for straw rejection
- load max F vs elongation dL: good data shape
- consistency tensile test results at CERN and at Dubna
- Sefar 250 straws
- Dubna 806 straws
- conclusion
Presented by S.Movchan
8-Jun-18
S.Movchan Straw manufacturing and QC 1

2. Tensile test results for mylar: Load max F vs elongation dL
8-Jun-18
S.Movchan Straw manufacturing and QC 2

3. 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
Dubna straw acceptance criteria: dL ≥ 1.0 mm (≥ 95 MPa)

4. can be extrapolated by “exp”
“Good data” shape:
can be extrapolated by “exp”
8-Jun-18
S.Movchan Straw manufacturing and QC 4

5. S.Movchan Straw manufacturing and QC
“Good data” shape:
like “triangle”
8-Jun-18
S.Movchan Straw manufacturing and QC 5

6. Consistency Dubna and CERN results for 10 Dubna straws:
264, 266, 269, 271, 273, 276, 280, 281, 282, 283)
Parameter: Load max (from tensile test)
data taken from file “Dubna Tensile test.xls”
8-Jun-18
S.Movchan Straw manufacturing and QC 6

7. S.Movchan Straw manufacturing and QC
Load max per sample width W=2mm (data from file “Dubna Tensile test.xls”)
START straw
Red – Dubna result
Blue – CERN result
Yellow - delta
END straw
Red – Dubna result
Blue – CERN result
Yellow - delta
8-Jun-18
S.Movchan Straw manufacturing and QC 7

8. Consistency of CERN and Dubna tensile test results
Parameter Load max (tensile test) was compare:
Load max = (10±3.0) N for CERN w=2 mm samples or
CERN and Dubna tensile test results are сonsistency
(except 1 measurement and 1 lost sample from 20)
8-Jun-18
S.Movchan Straw manufacturing and QC 8

9. data taken from file “CERN_Tracking_of_PET_01.06.11_CERN”
SEFAR 250 straws
data taken from file “CERN_Tracking_of_PET_ _CERN”
8-Jun-18
S.Movchan Straw manufacturing and QC 9

10. Load max vs straw # (Sefar 250 straws)
Blue – start straw
Red – end straw
L=3.7 kG
Straw Start and straw End – near the same quality OK!
Non stability during straw fabrication – about 10%
F min = 3.5 kG /10mm or 34 N/10mm
F max = 7.0 kG/10mm or 69N/10mm (K ~ 2, K=max/min)
CERN straw rejection criteria: Load max L< 3.7 kG (Strength < 100 MPa):
Rejected straw: N = 1 pc
8-Jun-18
S.Movchan Straw manufacturing and QC 10

11. Load max distribution (Sefar 250 straws)
L=3.7 kG
Load min = 3.25 kG /10mm
Load max = 7.25 kG/10mm (K ~ 2, K=max/min)
Rejected straws: N = 1 straw
8-Jun-18
S.Movchan Straw manufacturing and QC 11

12. data taken from file “Straw_data_05_05.xls”
Dubna 806 straws
data taken from file “Straw_data_05_05.xls”
8-Jun-18
S.Movchan Straw manufacturing and QC 12

13. S.Movchan Straw manufacturing and QC
Load max: Dubna 806 straws
Blue – start straw
Red – end straw
Straw Start (Blue) is better than straw End (red) due to dust accommodation on the anvil
Non stability of straw manufacture – about 25%
8-Jun-18
S.Movchan Straw manufacturing and QC 13

14. Load max F<3.7 kG (Dubna 806 straws)
F min = 2.5 kG /10mm
F max = 7.75 kG/10mm (K ~ 3, K=max/min)
Rejected straws: N = 28 straws
8-Jun-18
S.Movchan Straw manufacturing and QC 14

15. S.Movchan Straw manufacturing and QC
Conclusion
Analysis results for Sefar 250 straws and Dubna 806 straws are presented
Both CERN and Dubna proposed criteria for straw rejection will be tested on
Dubna straws. Straw “bad” if:
- Lad max F < 3.7 kG
- dL < 1 mm
8-Jun-18
S.Movchan Straw manufacturing and QC 15