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 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

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

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

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

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

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

Seog Oh/ Duke University/Oct, 2002 TRT/ ATLAS week at CERN Module 2.12  2.12 History  The first module strung since the stringing resumption  Mechanical construction was completed in Sept,  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.

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

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

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

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

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

Seog Oh/ Duke University/Oct, 2002 TRT/ ATLAS week at CERN  Examples of gain dip due to dirt on wire (from 2.08).

Seog Oh/ Duke University/Oct, 2002 TRT/ ATLAS week at CERN Summary  Wire-joint production and stringing is in full production mode.  Should not be problem meeting the schedule – completion by August,  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

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

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

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