1. S.Movchan Straw manufacturing and QC
Dubna straw status (21/05/2012)
straw parameters measurement results
conclusion
Presented by S.Movchan
12-Jun-18
S.Movchan Straw manufacturing and QC 1

2. 842 straws for Dubna Module #3
Tapes number
Straw
tubes
02-09 34
05-14
103
05-16
104
05-18 95
04-06 99
04-04 78
04-02 96
04-12
04-08
100
04-10
842
Last straw #
12-Jun-18
S.Movchan Straw manufacturing and QC 2

3. Straw diameter va straw number
For last 1015 straws (#861 ÷ #1875)
Straw start - Blue
Straw end - Red
Requirement: 9.75 ≤ Din ≤ 9.80 mm
Rejected – 30 pc
12-Jun-18
S.Movchan Straw manufacturing and QC 3

4. Test sample (o-ring 5 mm): elongation vs straw number
For last 1015 straws (#861 ÷ #1875)
Requirement: dL ≥ 1.0 mm
Rejected – 51 pc
12-Jun-18
S.Movchan Straw manufacturing and QC 4

5. Test sample (o-ring 5 mm): F vs straw number
For last 1015 straws (#861 ÷ #1875)
Requirement: F ≥ 3.7 kg
Rejected – 32 pc
12-Jun-18
S.Movchan Straw manufacturing and QC 5

6. S.Movchan Straw manufacturing and QC
Straw resistance
For last 1015 straws (#861 ÷ #1875)
Requirement: R ≤ 75 Ohm
Rejected – 0
12-Jun-18
S.Movchan Straw manufacturing and QC 6

7. Sonotrode track width vs straw number
For last 1015 straws (#861 ÷ #1875)
Requirement: (0.4 ≤ W ≤ 1.0) mm
Rejected – 1
12-Jun-18
S.Movchan Straw manufacturing and QC 7

8. Statistic for last 1015 straws
(#861 ÷ #1875)
Straw rejection results:
1. Straw parameter out of specification:
- out of D ~ 3 % ( 30 straws)
- dL < 1 mm & dF < 3.7 kG ~ 7 % ( 70 straws)
- out of R
- out of W ~ 0.1 %( 1 straws)
Total: ~ 10 % (101 straws)
2. Scratches on straw cathode ~ 2 % (17 straws)
Sub total: ~ 12 % (118 straws)
3. Straw overpressure long term test straws out from 352 pc
12-Jun-18
S.Movchan Straw manufacturing and QC 8

9. DB NA62 straw label: NA62TASTDU003525 NA62 – NA62 experiment
TA or TR – Tracker
ST - straw
DU–Dubna, JINR, Russia
CE – CERN (Sefar, Swiss)
– straw serial # ( )
12-Jun-18
S.Movchan Straw manufacturing and QC 9

10. Storage of 574 straws for Dubna Module #3
1-st measurement:
132 straws
After 3-d measurement:
354 straws
2-nd measurement:
88 straws
Total: 574 straws
12-Jun-18
S.Movchan Straw manufacturing and QC 10

11. S.Movchan Straw manufacturing and QC
Conclusion
Dubna 1972 straws were manufactured:
~ 20 straws/shift
~ 100 straws per spool L=300 m (straw L=2.5 m)
~ 12% straws are rejected
Straws for Dubna Module #3:
- manufactured – 842 straws:
- storage 574 straws (long term test)
- end plug glued 180 straws
12-Jun-18
S.Movchan Straw manufacturing and QC 11

12. S.Movchan Straw manufacturing and QC
12-Jun-18
S.Movchan Straw manufacturing and QC 12