Chiho Wang Technical Training Duke University May, Stringing 101 Chiho Wang Duke University

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

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

Chiho Wang Technical Training Duke University May, 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. u 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. u Don’t 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

Chiho Wang Technical Training Duke University May, About the Log file  M#-*_StringLog_%.csv u comma delimited (text/excel) file in c:\users\tension\data or d:\… u # = module type (usually 2 or 3) u * = module number ( ) u % = 1 or 2 for station number

Chiho Wang Technical Training Duke University May, 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. u end of stringing, start HV test u rework after 16 ch tension test..etc  Enter operator initial in Alphabetical order separated by “/” if >1 operator e.g. cw/eb  Set straw # = 0 for any log irrelevant tests

Chiho Wang Technical Training Duke University May, Tension program