Straw manufacturing current Straw manufacturing current statusstatus

T.Enik, S.Shkarovskiy, I.Polenkevich,Yu.PotrebenikovT.Enik, S.Shkarovskiy, I.Polenkevich,Yu.Potrebenikov07.02.201107.02.2011

““Raw” strawRaw” straw139 straws (2700 mm) are ready.

46 ring samples from the beginning of straws (5 mm width) and 22 ones from the end of straws were broken off on base material

~ 70 straws from one tape roll

20 - 30 “raw” straws per day

Example ofa bar code

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““Raw” straw qualityRaw” straw quality

A piece of the straw #3 remain alive at 7 Atm overpressure more then 10 days(end plug is formed by thermo glue)

Blue – start of the straw; Red – end of the straw

A piece of the straw #14 (~40 cm) remainAlive at 9 Atm overpressure more than 1 min; 1,5 mm elongation after break

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We proposemin=3 mm

““Raw” straw qualityRaw” straw quality

Blue – start of the straw; Red – end of the straw07/02/11 Yu.Potrebenikov 4

Min=4 kg

Min=3 mm

Last configuration of the welding Last configuration of the welding machinemachine

Thermo stabilization zone near welding point

New visualization: 2 microscope

Visual control

Frequency control

Automatic (computer)

control

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Thermo stabilization of the welding Thermo stabilization of the welding areaarea

General cooling

Local sonotrode cooling(air blowing by thin injector)

Small air overpressure into straw

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Straw quality before and after Straw quality before and after modification of the welding machine modification of the welding machine

Straw #83: only 5 rings from 26 broken along the seam

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Straw diameter distributionStraw diameter distribution

Blue – star of the straw; Red – end of the strawMore than 95% straws have the same diameter

9.77 mm (20 microns precision)

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Straw leakage Straw leakage

Straw and PVC tube with 4 Atm He overpressure in cooled boiled water

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Straw plugging and connection for long Straw plugging and connection for long term overpressure testterm overpressure test

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Conclusion and plansConclusion and plans

1. After modification of the welding machine straw quality seams good

2. Long term overpressure test and leakage test are under preparation

3. It is necessary to produce more than 500 straw till the end of February to deliver their to CERN at the beginning of March

4. It is necessary to define minimal straw quality test before sending straws to CERN and minimal straw quality test at CERN before their installation into Module-0

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