seog oh/ duke university/oct, 2002 trt/ atlas week at cern wire-joint production stringing status

Seog Oh/ Duke University/Oct, 2002 TRT/ ATLAS week at CERN

Wire-Joint Production

Stringing Status


Wire-joint Status One wire-joint production stations was reactivated in

June and the other in July The average production rate has been about

~80/station/8 hour shift. QC

Pull test for the first three wire-joints before production Requirement : the breakage has to occur other than wire-

joint. Usual breaking tension : ~200 gram Visual inspection of every wire-joints Image of every wire-joint is captured and saved

Need ~200/day to meet the schedule


Weekly Totals Wire Joints and Stringing

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2-Aug-02 9-Aug-02 16-Aug-02 23-Aug-02 30-Aug-02 6-Sep-02 13-Sep-02 20-Sep-02

Week ending

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Weekly Sum Wire Joints

Weekly Sum Stringing


Stringing Status Before the stringing halt due to joint problem, 11

Type 2 and 1 Type 3 modules were strung. Both stations are active. 15 Type 2 and 8 Type 3 modules are waiting to be

strung. 30-40/day/station without re-work Re-work : After the stringing, ~5-10% of wires are

replaced low tension < 50 grams ~ 130 Hz Abs( T(front)-T(back)) >5 Hertz HV problem – tested at 1700 V


Module 2.12 2.12 History

The first module strung since the stringing resumption Mechanical construction was completed in Sept, 2001. Wire was cleaned only once just before it entered the module with

99% isopropyl alcohol in ultrasonic cleaner. Exhibited many odd wave forms in the tension measurement.

Operation, signal test Current draw : nothing unusual => <1 uA after a few days 4 noise channels -> reverse voltaged 3 ASD groups (3x16 straws) ->

Ok after reverse voltage Very few wires with local gain dip -> little problem with ‘dirt’ on the

wire surface No correlation between odd looking wave form and gain variation Preliminary gain map exhibits no gross misalignment -> waiting for

HU’s full gain mapping.


Module 2-12 22-Aug-2002

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Frequency (Hz)

Front 8/22

Back 8/22


M2-12 Front - Back 22-Aug-02

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Front - Back (Hz)


M 3-06 Front - Back 30 Sept 02

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Tension


Examples of gain dip due to dirt on wire (from 2.08).


Summary Wire-joint production and stringing is in full

production mode. Should not be problem meeting the schedule – completion

by August, 2003.

2.12 Proper wire cleaning is important. No obvious alignment problem Do not understand the odd tension wave forms. Re-

measurement shows the same.

seog oh/ duke university/oct, 2002 trt/ atlas week at cern wire-joint production stringing status

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