18111039 Top surface of B3L12 1811521 Top surface of B3L12 1812511 B3L12 Tried to blow off, but couldn’t 1812709 Insde of tube. B3L15 The dot at the middle.

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Presentation transcript:

Top surface of B3L Top surface of B3L B3L12 Tried to blow off, but couldn’t Insde of tube. B3L15 The dot at the middle is a dust See and B3L12 B3L15

It is very easy to make a scratch mark on the surface. To see this Rachid touched the surface by his tool. Then a clear mark was left. We believe that the same thing happened when we see inside of the tube via the video scope at Machida. The many scratches were made by the scope itself when it touched the surface. The scratches inside This is a different place. But this is the first time the scope comes here. Most likely there weren’t scratches before the scope comes in.

This is a dust. It was blow-off ( ) This is out-side surface of Al tube sample. It is a finger print. No meaning Inside of the Al tube of B3L Inside of an Al tube kept outside Never exposed to NOVEC

The purpose of the 2 nd round (noon, with Rachid) is to compare the inside of the Al tube in stave and a sample Al tube kept outside. These pictures and the following pictures are the comparison of the two. The two samples are placed next to each other. Since the height is different, we need to adjust the focus to see the surface of each sample. It seems that their surface are similar. Hard to distinguish. Both has some sort of soft coating developed. Oxidation? (tube in B3L15) (Al tube kept outside)

RIM6072 RIM6076 RIM6077 RIM6078 Hubert cut and removed the back carbon sheet (RCC side) of B3L12 and exposed the Al tube. This is the region where we see strange structure inside of the tube by Machida scope. There are strange yellow spots here and there. So Hubert and I come to VTXlab to see those yellow things by the microscope at the lab

B3L12 top surface Start of the scan 2005/05/18 18:43 RIM /1/24 18:23 The time stamp date of the microscope is totally screwed up and it is off by 8 year. But time of the scope is not so bad and it is similar to that of my camera. The offset is 20 minutes. My camera’s time stamp has offset of 1:15 from the EST. So 18:23 (my camera) ~ 17:08 (EST). It seems that both of the microscope’s time and my camera’s time was set to EDT (and then drifted)

Scan the top surface of the tube This is B3L12 The arrow points to the approximate position where we saw a strange structure inside of the tube. One can see several spots that has yellowish stuff

Same stop; different focus (depth) Something along the side wall of aluminum

RIM :09(camera)=18:54(EST) End of top surface scan Start of side wall scan 19:17=18:57 (camera) Side wall also has the yellow stuff :28=19:08(camera) Hubert is pointing the place where we saw the strange feature by Machida scope. There is something there. RIM6089 and was taken at almost the same time

Place Hubert pointed in the last page Stronger spot of yellow Leaking here?? Is the why stuff glue? near end. Is there hole? End of the side wall scan 19:43(microscope)=19:23(camera)=18:08(EST)

RIM :09(camera)=18:54 EST Hubert had opened up the end of the tube This is the same B3L12, and this is the side we scanned from slide 5 The purpose is to look the beginning of the tube where we saw a lot of scratches in the video scope. A lot of scratches can be seen. We now believe that they were made by the video scope itself. The surface is covered by a very soft stuff that can be easily scratched

…what is these horizontal “black marks” Actually they are not black. They shine. It depends on how the light is reflected. These seems to be Aluminum surface. 20:42 microscope time = 20:22 camera time = 19:07 EST

RIM :26 camera time This is after microscope work. I looked into the tube and see something inside. So I tried to capture by camra, in vain. Here seems to be a thin yellowish horizontal line and then some object about 5mm from the bend position.