Personnel Required: At least two people are required, one of whom has been qualified for trimming and sanding of HDI tails. At least three people are required during rotation of the half cylinder. ONLY QUALIFIED TRIMMERS ARE ALLOWED TO TRIM AND SAND CABLES.
Qualified trimmers : Sasha Leflat, Andrew Cooper, Wayne Schmitt, Robin Sidwell

1. Tools and parts necessary:

1. Kapton tape slit to HDI tail width
2. Aluminum foil
3. Tape application tool with vacuum pump
4. Tail cutting tool
5. Tail holding tool (for sanding)
6. Sanding block
7. HEPA Vacuum cleaner
8. Short testing board and cable
9. Readout system
1. All personnel working on cabling should wear well grounded wrist or ankle straps. Check that the ground wires to the straps are clear of obstructions and do not endanger the barrels. Test for proper conductivity using the touch pad.
2. Refer to the cabling worklist for the next cable and location to be installed. If the half cylinder needs to be rotated or if there is a problem with access call an expert. Remove the cable from the box and check that the labels correspond to the numbers on the list.*
3. Check the worklist to determine if a foam spacer is needed under the connector end of the cable. If so, add the appropriate spacer using double sided tape.
4. Lay the cable into position one person should guide the far end of the cable thorough the supports while the second positions the low mass cable near the feedthroughs. Note – an expert should be present for the bottom cable in each bundle. Position the cable in z such that the HDI tail folds directly into the Hirosi connector. Temporarily hold the cable in position with a hairpin.
5. Check that the HDI tail device number corresponds to the number on the worksheet.*
6. Fold the HDI tail into position above the Hirosi connector. Make a mark with a non-permanent pen  above the nominal cut line along the white edge of the Hirosi connector.. Copy the device number to the region of the tail below the mark.
7. Steps 7-10 are done with the tail facing radially out from the ½ cylinder. Cut a length of double thickness Kapton tape and place it (using tweezers so no fingerprints are present) onto the tape application tool. Turn on the vacuum to hold the tape in place.
8. Apply the tape such that the inner end is at least 3/8" beyond the mark on the cable. Press the tape on to insure good contact. Check that the tape edges are flush with the HDI tail edges.
9. Clip or tape the far end of the tail such that it is controlled when cut off.  Use the cutting tool to snip the tail ~1/16" below the mark with the blade side of the cutting tool above the metal traces. Be sure that the cut is clean and perpendicular to the HDI edge.
10. Attach the tail holding tool about ¼" away from the cut. Position the vacuum cleaner hose under the tail and turn on the vacuum. Lightly sand the tail (10 strokes should be sufficient). Check for smoothness with your fingertip. Wipe down lightly with alcohol.
11. Carefully connect the low mass cable. Inspect for squareness. Fold the cable and HDI tail into position in the bundle. Hold the tail in position with foam or clips.
12. Connect the short testing board and cable. Verify that the resistance to ground is >100 ohms (nominal values are in the logbook) . Check that the clk-clkbar resistance is about 140 ohms.
13. Check that the power supply voltages and bias switches are correct for the ladder or wedge type being tested.
1. Tek supply memory 1 for 3 chip
2. Tek supply memory 2 for 6 chip
3. Tek supply memory 3 for 8,9 chip
14. Perform an initialization cycle. Take a raw data event. Check that the channel numbers increase continuously (no missing data bits).
15. Take 25 cal inject events. Check that the results are as expected for an unbiased detetctor.
16. Record power supply currents. If currents exceed maximum values call an expert.

 

 
 

Nominal Currents:

Ladder Type	AVDD (ma)		AVDD2 (ma)		DVDD (ma)
	Nom	Max	Nom	Max	Nom	Max
3 Chip	162	200	80	100	25	50
6 chip	360	450	155	190	50	100
9 Chip	470	590	220	275	75	120


 
17. Bias the detector to +/- 5 V (depending on device type), verify that current is being drawn.  This current will vary depending in the light exposure of the ladder.
18. Dress the cable into the bundle. Add (9/16" x 3/4") black elastomer tape (Scotch c130) to the cable at the location of the exit cable restraint.
19. Add carbon fiber cover to hold the cable in bundle. Trim the cable into the far end support carousel.
20. Wrap the end of the cable with aluminum foil.
21. Go to next cable.

* Call an expert:
Ron Lipton LD page 266-8242

Eric Kajfasz

Sasha Leflat
 
 

Three people are needed for this procedure. At least two should be an experts.

Expert list – Sasha Leflat, Jim Fast, Ronald Lipton, Dave Butler.

Before proceeding to the next postion:

•  Glue the cable restraints for the completed bundles into place. Allow to set for 2 hours.
• Tape the bundles together near the carbon fiber channels use a spot of DP110 to glue the top channel covers on.

1. Verify that all existing cable bundles are secured to the carousel and the half cylinder cable clamps.
2. Position one person at the carousel, a second in position to release the half cylinder brakes and and expert at the middle of the cylinde. Release the brakes on the aluminum hoops and on the carousel. The expert at the center of the half cylinder should slowly rotate the half cylinder and carousel to expose the next set of penetrations to be cabled. If there is unusual resistance in the half cylinder stop. Do not continue until the problem is understood.
3. Refasten the brakes.

1. Install kapton insulating spacers around each penetration. These are intended to avoid shorting the exposed HDI traces to the carbon fiber cylinder.

1. Carefully push the insulating cylinders around the cable bundle to be insulated until it encounters resistance from internal spreading of the cables inside the half cylinder. Make a mark where the insulator emerges from the half cylinder.
2. Remove the insulator. Trim the side away from the exposed HDI traces 1/8" beyond the mark. Trim the trace side 1/2" beyond the mark.
3. Reinstall the spacer in the cable bundle. The exposed insulator should lie under the lowest low mass cable on the side with inward facing HDIs.

1. Place pieces of blue tape over exposed probe holes.
2. If a radiation monitor cable needs to be attached. Fold the cable such that the exposed end will extend out of the low mass cable bundles. Attach the radiation monitor Hirosi connector. Secure to the cylinder with double sided tape.
3. Carefully route the template cable for each bundle of the set. The bundle should be as far as possible from the penetrations while leaving space for the neighboring bundles and avoiding the holes in the half cylinder used for CMM measurements. Add the cable restraints at the marked positions  for each bundle using double-sided tape to hold the restraints to the half cylinder.
4. Untape the bundles emerging from the penetrations.
5. Position the vacuum cleaner and arm rests if necessary.
6. Begin cabling.