Minutes of the Tracker Technical Meeting

October 16, 2002

Luca expressed some concern about getting software to Pisa for testing. Mutsumi was worried that if he sent his code it would be very difficult to people unfamiliar with it to get it going in Pisa.

Pisa has not received the Nusil CV2500 products, despite two shipments from SLAC that should be in Italy. Tom said that Nusil has succeeded with making a new batch of the conductive adhesive and should be shipping tomorrow. Three kits of CV15-2500 were shipped from shipped from SLAC yesterday. It has lower viscosity and is not hazardous. Sandro would like to use the same CV1142 for ladder gluing as for dam. Tom thinks the only difference between the products used so far is color. He said that all information is on the website http://www.nusil.com.

Plyform solved their vacuum problems and started tray production again this week. Ricardo is at Plyform assembling the last closeouts. Probably 2 trays will be assembled this week. Next week they will change from heavy to light trays. Plyform agreed to make 4 trays per week starting next week. The Tungsten assembly tool needs 2 pins remachined, but will be ready next week. Ricardo will bring to Pisa the Kapton assembly tool, and they will measure it in Pisa tomorrow. Sandro expects that they can start gluing Kapton and tungsten next week.

Pisa has prepared the design for a tool to cut finished face sheets without damaging the glue joint. Up to now face sheets were cut before mounting. He estimates about 2 weeks to make the new tool.

They have vibrated one heavy and one light bare tray panels. All trays will be vibrated after Kapton and tungsten mounting and trimming. Vibration will be repeated after mounting Si for the dummy trays.

Sandro will go Tuesday to G&A to discuss the process to wire bond from MCM to ladder. Sandro's plan is to attach the two existing samples to mockup trays and to glue to the mockup some Si for testing the bonding. We discussed the issue of how to test the wire bonds after thermal cycling on the EM mechanical trays. The only idea discussed that seems workable is to do the tests on one tray (two sides) that can be made with the HPK reject SSDs. (The live tray to be thermal cycled will provide another good test.)

Sandro was concerned about the schedule for the mini-tower and did not think it would be possible to complete the environmental tests on the live tray prior to mid January. Robert suggested to make an extra live tray to be left in Italy. There was a discussion about availability of tungsten for this. SLAC has 3 trays worth of thin tungsten on order to arrive in a week or two. Italy does not have enough extra thick plates for an extra tray, but it appears that we will have enough thin ones. Hence it was decided that we will make 5 live EM trays:

1. light tray with thin tungsten and SSDs only on the bottom (for the top of the mini-tower)

2. two light trays without tungsten and with SSDs on both sides

3. one light tray without tungsten and SSDs on just the top (for the bottom of the mini-tower)

4. one light tray with thin tungsten and SSDs on top and bottom, to remain in Italy for testing

Ossie reported that he took all of the invar in house at SLAC to be anealed. Just as a quick test of induced magnetism, he did tests Monday on inducing magnetic fields with an arc welder and got up to 30 gauss. Without anealing the invar that he has produced a reaction with the Earth's magnetic field at about 2.5% of the nominal field. This was with only a small fraction of the invar proposed to go into 16 towers. The measurements were made 35 cm and 90 cm from a suspended bar. He will measure the mu of the anealed material. Then he will build a frame that looks like the 16 cells and repeat the measurements. This will take another week or two. He will write a complete report.