Ring Installation Procedure

 

I) Moving detectors from Chemistry building to tunnel: 2-3 people

  1. Ring is installed in transport box. Two halves of ring are bolted together at the top, and held together with tape at the bottom. Position in transport box is such that the top of the ring fits into the foam cutout, and the bottom goes over the foam piece that fixes it in place. Ring should be immobilized before transport.
  2. Somebody opens chemistry lab doors, and clears the way, while Alan carries transport box to car in parking lot.
  3. Box is placed in back seat of car. Alan sits in back holding box in place in case of bumps.
  4. Travel to tunnel, going counter-clockwise around ring to area 1010. No special precautions or escort is required.
  5. The dry boxes are carried into the area (one person with another person as escort). One person clears the way to the tunnel (opening outside doors, then gate, then inside doors) as Alan follows carrying transport box into tunnel.
  6. At PHOBOS, somebody goes to the outer side of the beamline. Alan passes transport box under Blue underpass, and box is placed on ready table in the tunnel. The ring is now safely in the tunnel.

 

II) Stand preparation

  1. Stand is installed, aligned, and secured with 4 bolts onto the support blocks. After the survey, there will be scribe marks with which to align.
  2. The position of the adjustment screw is, by arbitrary convention: when viewed from the IP, the adjustment screw is to the right, i.e. on the outside of the beamline for -Z, and inside for +Z.
  3. The knob is turned to move the slide as far as possible away from the beam pipe (in the direction towards the screw) while still allowing it to be bolted down.
  4. Check that detector enclosure is prepared. The screws that hold the halves together along the front and back faces must be removed on the same side. The brass bars on both faces should be attached to one side. Both D cables should be secured inside the enclosure and all fastening screws and tools should be in easy reach. The pre-folded flex cables are fed through the slots in the bottom of the enclosure and the D end of the cable is fixed with tape at the hole in the face of the enclosure, where later the mylar window will be installed.

 

III) Moving first ring half to stand

  1. The detector half on the side of the adjustment screw is installed first. For rings at +Z, this is on the inside of the beam. See notes in section (4) concerning passing detector under pipe.
  2. Remove the nut fixing the clear tray in the transport box to the right hand shelf.Remove tray (with ring on it) from transport box and put on table -close box to conserve desiccant.
  3. Rachid lifts ring off of tray, holding it at top and bottom so that when the bolt and tape are removed the two halves will not move relative to each other.
  4. Alan removes binding tape, then unscrews clamping bolt at top of ring, while ring is held firmly by Rachid.
  5. NOTE: Separate while detector is on tray?Ring halves are now separated. Rachid takes the left hand half and replaces it on the transport tray. Alan brings right half to the stand.
  6. Pick of half of detector that goes on the outer side of the beam (second person hold tray to secure other half).
  7. Install detector over dowel pins at the bottom and slowly rotate it to be flush with the stand. Secure with the bolt (not too tight). Make sure that bolt seats correctly.
  8. Loosen securing bolt at the bottom. Turn knob to move slide until detector is centered on the beam according to the scribe marks on the frame (will be added after survey).
  9. Fasten both securing bolts at the bottom of the stand.

 

IV) Moving second ring half to stand

  1. One person lifts ring from tray and hands it under beamline (at the blue cover at the end of the pipe) to second person.
  2. The ring is aligned with the bottom dowel pins first and the rotated up to align with the top dowel pins. Second person stands on the other side of the pipe guiding.
  3. Holding the two halves securely, the bottom screws are loosened and then lightly tightened to make sure they are captured.
  4. The top screw is checked and tightened. Recheck, then tighten bottom screws.
  5. Recheck centering and height adjustment. Check tightness of all bolts on detector and stand.

 

V) Installing enclosure (requires 3 people)

  1. Install the piece without the top panel first.
  2. With the enclosure top tilted away from the beam, position the brass plate or the corner and lip so the enclosure is supported at the bottom.
  3. Roughly align with the screw holes and slowly rotate the enclosure to a vertical position.
  4. Enclosure is held by one person while the other one fastens the bottom screws.
  5. One person hold the attached side while the other two guide the second half into position, again positioning on the bottom support and aligning with the screw holes before rotating up from the bottom. Take care that the brass inserts interleave properly all around so that the two halves mate properly.
  6. Fasten the three screws holding the second enclosure half at the bottom.
  7. Secure the two halves together with the two screws holding the top together. Attach one small screw just above and below the circular opening on both faces.
  8. Attach the D cables to the connectors on the readout board.
  9. Install the mylar windows.
  10. Install the remaining screws on the front and back faces.
  11. Connect air supply hose on top of enclosure.
  12. Connect C and D flex cables together.