Procedure for Replacing a Wedge on a Disk

• Locate the special tools that you'll need: http://www.phenix.bnl.gov/WWW/fvtx/BNLAssembly/tools/tools.html
  • silver epoxy
  • non-acid solder
  • hot glue gun
  • thermal grease
  • graphite feet, jig and glue
• To remove the wedge:
  • disconnect the extension cable from the ROC, using the pair of levers (picture 2 on the tools page)
  • disconnect the bias cable from the ROC board
  • remove 2 screws that hold the wedge. The wedge will likely remain in place, held by the thermal grease. Pop the wedge loose.
  • disconnect the extension cable from the wedge, using the special tool (picture 3,4). Note there are different versions of this tool.
  • disconnect the bias cable from the wedge, using tool from picture 7.
  • clean the thermal grease from the st.3 disk with a q-tip (dry)
• Adding graphite feet to the new wedge:
• grounding wire: see
  • http://www.phenix.bnl.gov/WWW/fvtx/BNLAssembly/wedge_grounding.html
  • http://www.phenix.bnl.gov/WWW/fvtx/pictures/bnl_pic_Nov2010/injectwire/index.html
  • and pictures 83-86 on this page: http://www.phenix.bnl.gov/WWW/fvtx/DetectorHardware/Assembly/pictures/RAW_BNL/index.html and http://www.phenix.bnl.gov/WWW/fvtx/pictures/miscellaneous/smallwedge_bot.png
  • When I made these, I pre-bent the wires to follow the edge of the HDI, so they don't get snagged later.
  • make sure you have the right solder, and use very little of it.
  • epoxy the other end of the ground wire into the hole
  • fix the wire in a few places with a few drops of hot glue.
  • connect the extension cable (tool 1)
  • connect the bias cable (tool 5 or 6)
  • apply a SMALL amount of grease to the feet. This stuff does not squeeze out like glue.
  • screw down the wedge, using the torque-limited screwdriver
  • connect the extension cable to the ROC
  • connect the bias cable to the ROC