Subject: invenstigation plan of the stripixel ladder From: Yasuyuki Akiba Date: 1/15/13 12:57 PM To: nouicer , Paul Stankus , , Hubert van Hecke , "Sondheim, Walter E" , "Pisarski, Robert" , '秋葉 康之' Dear all, The following the summary of our discussion today on the investigation plan of the stripixel ladders. This is based on my notes. If there is correction/addition, please post it to this list. Sincerely yours, Y. Akiba ----- l Channel test of six ladders (3 bad, 3 good) This has been done by Rachid and Paul. All silicon module electronics (bus, SVX4, etc) are alive l Remove the 6 ladders tested above from B3 barrel. This will be done this afternoon. 1) Gas leak test using sniffer on the removed ladders. This is before taking out Silicon Modules. 1a) N2 pressure test of the removed ladders. Record the leak rate. 2) Take out silicon modules from the ladders 3) Gas leak test using sniffer to locate the leak position on the staves without silicon modules 3a) Leak rate measurement by N2 pressure test. Confirm that the leak rate is not changed before/after removing silicon modules 4) Thermal test of the staves This probably will take place at Physics Use NOVEC and FVTX chiller Use thermal camera that Dave Lynn has 5) After thermal test, send at least one of the two worst broken ladders to MACHIDA company near Tappan Zee Bridge. They investigate the interior of the aluminum tube using a small diameter fiber scope they have. Their fiber should be able to go through the inlet/outlet of the cooling tube so this is a non-destructive test. Walter will go to the company to see the investigation. YA wants to go there, too. Hopefuly this can take place before the weekend. 6) X-ray the stave? There was discussion on the usefulness of high resolution X-ray imaging. It is unclear at this point we have access to a good X-ray equipment. We decide on X-ray test later. 7) Autopsy of one of worst broken ladder. This ladder should be the one that was examined by MACHIDA company in Step (5). There was discussion on how to cut the ladders. I think the procedure that was agreed upon is 7-1) Cut the carbon form from the side and remove the carbon form. We should be able to see the aluminum tube after the foam is removed. Take photographs of the aluminum tubes. 7-2) Mill-off the carbon sheet of the backside. There is a 1 millimeter thick carbon foam between the aluminum tube and the carbon sheet. How to remove the carbon foam from the aluminum tube was not decided. The foam was glued to the aluminum tube so it could be difficult. It is very important not to scratch the surface of the aluminum tube. We need to find a way to remove foam without any damage on the tube surface.