Stringing 101

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• Stringing 101
• Chiho Wang
• Duke University

2
Stringing Station

• What does the tension program do?
• High voltage test
• All wire must hold 1700 V
• Measure wire tension
• 135Hz (55.5g) lt wire tension lt 165Hz (83g)
• Write a wire history file
• For future reference in case of problem
• The following forms should be in binder during
  stringing.
• Stringing rework.xls
• Straw-wise anomaly.xls
• Forms can be printed from construction room PC
  heppc5 e\heplab\forms

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HV test

• General
• Both switches on HV power supply should be up for
  operation
• Current draw limit dial should be on 100uA
• Tension plate should be grounded (if can not
  ground tension plate, supervisor should be
  contacted)
• When testing many wires (e.g. after stringing)
• Set HV duration to a long time
• (e.g. 3000 sec)
• Set straw number 0
• Record failed channel on log book and rework
  sheet later for rework.
• Use ltAbortgt to turn off HV
• When testing a single channel (e.g. during wire
  rework)
• Set HV duration to 3 sec (default)
• Set straw number to the straw being tested
• Ground both ends of wire then run HV test

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Stringing Tension Measurement

• Pulling wire out of spool should be slow and eyes
  on wire. Always minimal handling/contact of wires
• Tension plate should be grounded.
• Always check that the straw number on screen is
  the actual straw being worked on.
• If small or no peak, try Low Scan first
• Wire history should be entered in the order of
  actions taken, and as complete as possible.
• e.g. repin, wire broke, wire removed, restrung...
  
• Do not hesitate to make a Other comment when
  you see something unusual.
• When skipping a straw, also write down straw
  and reason of skipping on rework sheet.
• Dont try too hard before skipping a wire during
  stringing process. Skip the wire before feeling
  frustrated (3 tries). String along and keep
  yourself in good mood!
• Use a new rework sheet in every run of rework

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About the Log file

• M-_StringLog_.csv
• comma delimited (text/excel) file in
  c\users\tension\data or d\
• module type (usually 2 or 3)
• module number (01 - 35)
• 1 or 2 for station number

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About the Log file

• The final tension of a wire can be found in
  M-_Accepted_.csv or by finding last Accepted
  in comment in log file
• In operation make a other comment when
  finishing one phase and going into another phase
  e.g.
• end of stringing, start HV test
• rework after 16 ch tension test ..etc
• Enter operator initial in Alphabetical order
  separated by / if gt1 operator e.g. cw/eb
• Set straw 0 for any log irrelevant tests

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Tension program