ASSEMBLY PROCEDURES FOR THE PHENIX

PAD CHAMBERS

Revision No. A

Date: 7/7/1998

Prepared by: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

PHENIX Safety Approval: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

ES&H Approval: \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

1.  **[Purpose and Scope]{.underline}**

This procedure provides instruction for winding the wire on the Pad
Chamber, and for subsequently assembling the top cathode panel on the
bottom pixel panel in building 820.

2.0 **[Responsibilities]{.underline}**

The operator is responsible for winding the wire using the winding
machine and loading the wire onto the pixel panel of the Pad Chamber.
The operator is also responsible for assembling the two panels together
in a completed Pad Chamber.

3.0 **[Prerequisites]{.underline}**

1.  Any and all operators shall be designated as being cognizant of the
    proper operating practices by the PIC.

2.  The winding machine power shall be off at the power distribution
    panel before beginning this procedure.

4.0 **[Procedure]{.underline}**

4.1 Operator shall ensure power is off winder.

2.  Bring winding carriage to the top of winder.

3.  Place pixel panel on wire transfer table.

4.  Lower wire transfer table to ensure that the pixel panel is out of
    the wire plane.

5.  Bring winding carriage to starting position.

6.  Load cathode wire spool (75μ Τungsten-Rhenium).

7.  Turn on power to winder.

8.  Adjust wire tension by hanging weight from wire and turning pot
    until weight is suspended.

9.  Bring carriage to spool end of winder.

10. Turn off power to winder.

11. Thread wire through pulleys.

12. Tape loose end of wire to frame.

13. Turn on power to winder, holding wire spool to prevent wire
    breakage.

14. Adjust carriage speed control and ensure step controller is set to
    3.

15. Wind wire (\~2 hours). The winding machine shall not be unattended
    during the winding process.

16. Shut off power to winder.

17. Bring carriage to top of winder.

18. Raise pixel panel to wire level.

19. Adjust pixel panel placement with set screws so that wire aligns
    above alignment marks on pixel face sheet.

20. Solder wires to terminal board.

21. Trim unused wire ends.

22. Lower pixel panel out of plane of wire.

23. Repeat steps 4.2 through 4.22 with anode wire (25μ
    Copper-Beryllium).

24. Transfer pixel panel to assembly table.

25. Apply alignment comb.

26. Epoxy wires in place. Operator shall ensure that ventilation fans
    are on during the entire 24 hour cure time of the epoxy.

27. Mount spacer rails.

28. Epoxy rails in place.

29. Load O-ring in groove.

30. Install alignment pins.

31. Place cathode panel on top of pixel panel.

32. Bolt panels together.

33. Place completed chamber in storage rack.

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1.  **[Documentation]{.underline}**

2.  Documentation shall be kept in the PIC's Log located in the tool
    cabinet in building 820.

7.0 **[References]{.underline}**

All Pad Chamber Assembly Procedures and Technical Documents can be found
on the PHENIX Pad Chamber web site and related webs sites reachable via
[http://phenix.rhic.bnl.gov/phenix/WWW/tracking/pc]{.underline}.