11-Sep-14

1. Test results of straw rejectionfor 3criteria • - Dubna 806 straws: Load max F vs elongation dLdata shape • - test results of straw rejectionfor 3criteria • - conclusion • Presented by S.Movchan 11-Sep-14 S.Movchan Straw manufacturing and QC 1

2. Dubna 806 straws data taken from file “Straw_data_05_05.xls” 11-Sep-14 S.Movchan Straw manufacturing and QC 2

3. Load max F vs elongation dL: 3-D presentation Dubna 806 straws N Cut: F=3.7 kG F (kG) dL(mm) 11-Sep-14 S.Movchan Straw manufacturing and QC 3 dL=1 mm

4. Load max F vs elongation dL: 3-D presentation F (kG) N Good 3.7 kG Bad F (kG) dL(mm) dL(mm) 11-Sep-14 S.Movchan Straw manufacturing and QC 4

5. Zoom of BAD region N 7 straws 8 straws N F (kG) dL(mm) F=(3.7-8) kG dL=(0-1) mm F (kG) dL(mm) 11-Sep-14 S.Movchan Straw manufacturing and QC 5

6. Load max F vs elongation dL Blue – start straw Red – end straw data shape 11-Sep-14 S.Movchan Straw manufacturing and QC 6

7. 6 samples from Sefar September Dubna data shape is not like expected: Due to this we have some probability to install “BAD”straw (elongation less than 1 mm) in the Module-0 after straw rejection (non elastic mylar deformation is started after dL=0.5 mm at 100 MPa) 11-Sep-14 S.Movchan Straw manufacturing and QC 7

8. Dubna 806 straws • Test results of straw rejection for 3 criteria: • Load max F< 3.7 kG (Strength=100 MPa) • dL < 1 mm • dL < 1 mm @ Load max F< 3.7 kG 11-Sep-14 S.Movchan Straw manufacturing and QC 8

9. Load max F<3.7 kG (Dubna 806 straws) Blue – start straw Red – end straw F=3.7 kG F min = 2.5 kG /10mm F max = 7.75 kG/10mm (K ~ 3, K=max/min) Rejected straws: N = 28 straws 11-Sep-14 S.Movchan Straw manufacturing and QC 9

10. Load max F<3.7 kG(Dubna 806 straws) BUT Blue – start straw Red – end straw F=3.7 kG Rejected straws: N= 28 straws CERN straw rejection criteria: Load max L ≤ 3.7 kG (Strength ≤ 100 Mpa) Rejected straws: N = 28 straws (~ 3.5 %) and we have 7 straws (~ 1%)with elongation less than 1 mm 11-Sep-14 S.Movchan Straw manufacturing and QC 10 7 straws (~ 1% ) are with elongation less than 1 mm

11. dL < 1 mm (Dubna 806 straws) Rejected straws: N= 15 straws Blue – start straw Red – end straw Dubna straw rejection criteria: elongation dL < 1 mm Rejected straws: N = 15 straws ( ~ 2 %) and all good straws have elongation more than dL ≥ 1 mm !!!!! dL=1 mm 11-Sep-14 S.Movchan Straw manufacturing and QC 11

12. dL < 1 mm @ Load max < 3.7 kG (Dubna 806 straws) Blue – start straw Red – end straw dL=1 mm F=3.7 kG Rejected straws: N= 56 straws Dubna straw rejection criteria: elongation dL < 1 mm @ L < 3.7 kG Total rejected straws: N = 35 straws (~ 4 %) and all good straws have elongation more than dL ≥ 1 mm @ L > 3.7 kG 11-Sep-14 S.Movchan Straw manufacturing and QC 12

13. Conclusion Both CERN and Dubna proposed criteria for straw rejection were tested on Dubna straws. Was shown that: - rejection criteria Load max F < 3.7 kG (Strength=100 Mpa)is wrong due to ~ 1 % of straws (7 straws out from 800) have elongation less than dL=1 mm - rejection criteria dL < 1 mm is correct. Number of rejected straws are N = 18 straws ( ~ 2 %) - combine criteria dL < 1 mm @ Load max F < 3.7 kG was tested too. Number of rejected straws are N = 35 straws ( ~ 4 %) 2 criteria and are tested and acceptable ------- Sefar straws: Straw sample elongation was not fixed during tensile test. So, straw rejection criteria can not be correctly tested. Elongation must be measure too. wrogn “soft” “hard” “soft” “hard” 11-Sep-14 S.Movchan Straw manufacturing and QC 13

14. 11-Sep-14 S.Movchan Straw manufacturing and QC 14