TOFp System Procedure:
pVPD Installation


   Description:
This is the procedure to re-install an entire pVPD (structure, PMT Assys, electronics) to its operational mounting location. This procedure is the same for the installation of the East or West pVPD, as the two are identical.
   Related Documentation:
  1. TOFp Glossary
  2. pVPD CADD Drawings
  3. pVPD Removal Procedure
   Requirements:
  1. Notification & Approval of TOFp Group
  2. Notification & Approval of STAR Operations Group
  3. Two (2) People to perform this work
  4. STAR Area Manlift Training for at least one worker.
  5. STAR Magnetic Field is OFF
  6. CTB High Voltage Supply is OFF.

    7. TOOLS:
  7. Large Ladder
  8. Manlift
  9. Carpenters Square
  10. Several wrenches for 1/4-20 hex bolts
  11. Several wrenches for XX-XX hex bolts
  12. 6-32 Nutdriver
  13. Cable tie snips
   Procedure:
    ACCESS:
  1. Make sure STAR Magnet is OFF.
  2. Make sure CTB HV Supply is OFF.
  3. Position manlift to face due south(north) at the steel floor rails on the East(West) side of STAR for access to East(West) pVPD.
  4. Position Large Ladder in front of manlift, to allow access to side of pVPD opposite to that accessible from manlift. Use ropes to secure ladder to some solid object nearby for support.
  5. One worker rises to height of pVPD in manlift, and extends floor to within ~4" of pVPD. Insure the manlift floor cannor rock or sway by enough that the manlift railings strike the pVPD, I-beam, or anything else.
  6. The other worker climbs the ladder.

    7. BASEPLATE INSTALLATION:
  7. Grab Base Plate and from its secure location on the floor of the manlift. Remember that there are fragile electronics in the FEE box.
  8. While being spotted by the worker on the ladder, hold the base plate up against the bottom of the I-beam, and rotate the four clamps so that each registers, squarely w.r.t. the Base Plate, on the lip of the I-beam. The Base Plate can now rest without active support, although one worker should still spot the Base Plate while the other continues the installation.
  9. Slide the Base Plate along the I-beam so that the straight-through hole through the I-beam and the straight-through hole in the Base Plate are perfectly aligned.
  10. While one worker is holding the Base Plate up and against the I-beam while the bolt hole is aligned, the other worker installs and mostly-tightens the single (1) 1/4-20 hex bolt that passes through the I-beam and Base Plate.
  11. Readjust the squarenes of the four I-beam clamps if necessary.
  12. Recheck the squareness of the Base Plate w.r.t. the I-beam using the Carpenters Square.
  13. For each of the four I-beam Clamp Bolts, adjust clamp and bolt position so that bolt is as vertical as possible. Use the XX-XX wrenches to tighten each of these bolts. By turning the wrench slowly it is possible to feel the tension at which the bolt "locks". Keep tightening these bolts until each is locked, tighten in steps where all four bolts are done to the same level on alternating corners of the structure.

    14. UPPER STRUCTURE INSTALLATION:
  14. While being spotted by the worker on the ladder, Lower the Upper Structure straight down and rest it on the Base Plate.
  15. Recheck that the Upper Structure is square and aligned with the Base Plate. Recheck that the Upper Structure is pointing the right way - the smooth face of the pVPD Detector Assemblies should be facing towards the target, and the sides w/ the SHV and BNC connectors face the balconies.
  16. Use wrenches to reinstall the Eight (8) 1/4-20 Hex Bolts that pass vertically through the Base Plate and the angle brackets on the Delrin Front and Back Plates. This locks the Upper Structure to the Base Plate.
  17. Locate the 4 o'clock Detector Assembly, and the Four (4) 1/4-20 hex bolts that pass through the Delrin Front and Back Plates and through the aluminum Boat. The 4 o'clock pVPD Detector Assembly is hose-clamped to this Boat - do *not* loosen or remove these hose clamps.
  18. Grasp the Detector Assembly, lightly loosen these four bolts, and slide the Boat/Det Assy inwards along the slots in the Delrin Front and Back Plates. Adjust the Boat position at both ends so that the pVPD Detector Assembly is ~1/8" radial distance from the beam pipe, and the long axis of the pVPD Detector Assembly is parallel with the pipe, judged using their outer surfaces.
  19. Retighten the four bolts so that this Boat is securely held by the Delrin plates again.
  20. Repeat previous three steps on the 8 o'clock Detector Assembly.

    21. CABLING INSTALLATION:
  21. Reinstall the BNC cables (Black jacket) to the rear of each detector assembly.
  22. Reinstall the SHV cables (Red jacket) to the rear of each detector assembly.
  23. Reinstall the Threshold Bus Cable to its feedthough connection at FEE box.
  24. Reinstall the LV Bus Cable to its feedthough connection at FEE box.
  25. Carefully reinstall the 6 signal cables to the 'rear' face of FEE box. Please note the label on this face of the FEE box, which indicates which signal cables go into the specific outputs of the FEE Board.
  26. Use 6-32 nutdriver to open FEE box (from below). Reinstall Thermocouple (small brown 2conductor) wire into open air inside FEE box. Carefully cable tie as appropriate to insure the thermocouple end does not and can not touch anything but air inside the FEE box.
  27. Reinstall cable ties to professionally organize the cables onto the Upper Structure.
  28. Lower manlift, unlash Ladder, and remove each in appropriate locations.
   Testing:
  1. FEE Voltage and Current Draw Tests
  2. HV Test
  3. Signals at Nim Bin #1?
   Completion:
  1. Notify STAR Operations that job is complete.
  2. Contact TOFp Control to inform that procedure is complete, and with any end-of-procedure comments that are necessary.
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