Hand-Processed Changes

HPC Number Date Type Section Number Initials

1\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

2\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

3\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

4\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

5\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

6\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

7\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

8\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

9\. \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_

[Type of HPC Changes]{.underline}

1\. Editorial

2\. Procedural

Approvals

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_\_\_\_\_

(Particle Physics, MSD, D-Zero Operations leader.) Date

1 [Purpose]{.underline}

> This procedure is used as an aid when opening the "B" pixel of the
> D-Zero detector.

2 [Prerequisites]{.underline}

1.  The leader of the D0 operations group or his designee must be
    present for the move.

2.  The "Z" (north/south) position of the pixel near it's support points
    (relative to the AB truss or EF iron) needs to be measured to within
    1/32" and recorded prior to any moving or disconnection.

3 [Procedure]{.underline}

OPENING

1.  Measure the pixel frame to EF distance at about four locations along
    the bottom edge and at the corners. Ideally this is done at the
    threaded rod or tie rod support positions. Clearly mark and record
    where the measurement is taken.

2.  Measure the pixel frame to EF distance at the inner perimeter. The
    top edge can be safely reached from on top of the muon shielding
    iron nose piece. The bottom edge is accessible by ladder.

3.  Measure the pixel frame to EF distance along the outer edge on the
    east and west edges, ideally near the support rod locations, but
    accessibility and personal safety may dictate differently.

4.  At the top of the AB truss, measure the pixel mover inner arm
    position relative to the outer tube. This can be conveniently done
    at the open end of the outer tube away from the pixel. Theoretically
    this distance will be identical after the move due to the use of the
    locking pin between the inner and outer tube.

5.  Measure the pixel frame to EF distance at a few locations along the
    top edge from inside the AB truss.

6.  Disconnect the pixel frame attachment points that are located around
    the inner and outer perimeter. When disconnecting, keep in mind that
    during re-connection, the goal is to put the frame in the exact
    position it started in.

7.  Open the muon shielding clamshells, nose piece and disconnect and
    pull away the bridge arms from the EF. Follow the articulation
    procedures.

8.  Remove the locking pin from the inner and outer mover tube, east and
    west side.

9.  Look over the frame one last time to be sure it is not anchored.

10. Look over the frame for possible wires that could be damaged or
    other interference that could occur during roll out of the plane.

11. Measure clearances in front of the plane to determine amount of
    opening that is possible. Note that the EF iron is opened 39" when
    it is moved. The plane maximum opening should be the same.

12. One team of two persons is located on each side of the upper AB
    truss. They work the push screws using a manual (or pneumatic)
    ratchet. Each team has a walkie talkie.

13. At least two persons are stationed on the sidewalk at the east and
    west edges of the plane to watch for interference. Each person has a
    walkie talkie.

14. An overall team leader/supervisor is located in the upper AB truss
    towards the middle with a walkie talkie. He coordinates and directs
    the move.

15. The overall team leader gives the order to back off the forward most
    screw a given amount such as 1 or 2". The teams do so.

16. The team leader then directs the teams to screw the drive screws at
    roughly the same rate and time such that the pixel frame is driven
    out evenly. Caution! Do not drive the screw hard into the stop or
    thread damage will occur.

17. The process repeats, driving the pixel frame out. Note that the push
    stop will need to be disconnected from the inner tube and moved at
    8" intervals during this process. Maximum driving out distance is
    39" or less.

18. When the final open position is reached, turn the drive screws so
    that they lightly contact the stop.

CLOSING

19. Remove all equipment and interference from behind the pixel frame to
    MDT.

20. Look over the pixel layer at the perimeter to ensure that there are
    no cables or other interference problems that will occur during
    closing.

21. Position personnel in the same locations used during opening.

22. Team leader/supervisor in top of AB truss gives order to back off
    the inner stop screw by a given amount such as 1 or 2". The teams do
    so.

23. The team leader then directs the teams to screw the outer drive
    screws at roughly the same rate and time such that the pixel frame
    is driven evenly. Caution! Do not drive the screw hard into the stop
    or thread damage will occur.

24. The process repeats, driving the pixel frame to the final closed
    position. Note that the push stop will need to be disconnected from
    the inner tube and moved at 8" intervals during this process.

25. The final closed position is determined by the measurement between
    the inner and outer tube at the back open end combined with the
    ability to insert the locking pins.

26. Insert the locking pins between the inner and outer tube, Turn the
    drive screws so that they lightly contact the stop on each side.

27. Connect the accessible anchor points around the pixel frame. Adjust
    anchor points only if the reference measurements are not the same.
    Contact the project engineer if this is necessary.

28. Extend and connect the muon shielding bridge to EF using the
    appropriate procedure.

29. Extend the muon shielding nose piece and close the muon shielding
    clamshells using the appropriate procedure.

30. Connect the anchor points that are accessible from on top of the
    nose piece.

31. Make final adjustments to get all "z" location values to within
    1/32" of starting dimensions. Project engineer to organize and
    present before and after measurements to the D0 run coordinator.

4 [References]{.underline}

None

5 Supporting Documentation

> 5.1 FNAL drawing 3823.130-ME-399054, "D0 Upgrade / Pixel Layer "B"
> Mover, general Layout, type "B".