Difference between revisions of "Inspection with an electron microscope II"
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The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as | The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as | ||
− | C > Al > O | + | C > Al > O. White spots are Ca = C = O > Al > P |
+ | |||
+ | === Under source (irradiated) === | ||
+ | {| border="1" cellpadding="2" | ||
+ | |- | ||
+ | |width="415pt"|[[Image:stone-source-500um.jpg|thumb|none|400px|Stone kapton straw that was irradiated (500um scale).]] | ||
+ | |width="415pt"|[[Image:stone-source-20um.jpg|thumb|none|400px|Stone kapton straw that was irradiated (20um scale).]] | ||
+ | |width="415pt"|[[Image:stone-source-5um.jpg|thumb|none|400px|Stone kapton straw that was irradiated (5um scale).]] | ||
+ | |- | ||
+ | |} | ||
+ | The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as | ||
+ | C > Al > O . The X-ray analysis of a dark spot gave C = 0 > Al. Also the darker the spot the more O present. | ||
+ | |||
+ | |||
+ | === 3 years under voltage (big prototype) === | ||
+ | {| border="1" cellpadding="2" | ||
+ | |- | ||
+ | |width="415pt"|[[Image:stone-3y-500um.jpg|thumb|none|400px|Stone kapton straw that was used for three years (500um scale).]] | ||
+ | |width="415pt"|[[Image:stone-3y-20um.jpg|thumb|none|400px|Stone kapton straw that was used for three years (20um scale).]] | ||
+ | |width="415pt"|[[Image:stone-3y-5um.jpg|thumb|none|400px|Stone kapton straw that was used for three years (5um scale).]] | ||
+ | |- | ||
+ | |} | ||
+ | The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as | ||
+ | C > Al > O, also the darker areas gave the same relative C > Al > O. | ||
+ | |||
+ | |||
+ | == Lamina thin straw == | ||
+ | {| border="1" cellpadding="2" | ||
+ | |- | ||
+ | |width="415pt"|[[Image:lamina-thin-20um.jpg|thumb|none|400px|Lamina-thin straw that was irradiated (20um scale).]] | ||
+ | |- | ||
+ | |} | ||
+ | The relative X-ray analysis of a normal area (light gray) gave three peaks C, Al, and O. The magnitude of the peaks compared as | ||
+ | Al > C > O. The dark spots showed O > Al > C or O = Al > C . White spots are Ca = C = O > Al > P | ||
+ | |||
+ | == Lamina thick straw == | ||
+ | {| border="1" cellpadding="2" | ||
+ | |- | ||
+ | |width="415pt"|[[Image:lamina-thick-20um.jpg|thumb|none|400px|Lamina-thick straw that was irradiated (20um scale).]] | ||
+ | |- | ||
+ | |} | ||
+ | The relative X-ray analysis of a normal area gave one peak: Al. The white dots are Fe | ||
+ | |||
+ | |||
+ | == Conclusion at 2am == | ||
+ | It might be that the dark gray areas seen on the kapton and Lamina-thin straws after radiation are due to the same process. They appear to be | ||
+ | a higher concentration of (Al?)O indirectly induced by radiation. This process takes time and it looks that after 3 years of normal (low radiation) | ||
+ | operation of a stone kapton straw a difference (darker gray areas) can be observed with the EM but not with the X-ray analysis. As after an equivalent | ||
+ | of 44 years of radiation the straw (Lamina-thin and kapton) shows a big increase in dark areas or "black pits" the straw is still operational. It | ||
+ | hints that although the aLuminum layer of the Lamina-thin straw "degrades" after being exposed to radiation, | ||
+ | this process is too slow to harm operation during the running period of GlueX. The Lamina-thick straw does not show any effect at all. |
Latest revision as of 16:13, 12 March 2010
Contents
Stone kapton straw
Pristine
The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as C > Al > O. White spots are Ca = C = O > Al > P
Under source (irradiated)
The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as C > Al > O . The X-ray analysis of a dark spot gave C = 0 > Al. Also the darker the spot the more O present.
3 years under voltage (big prototype)
The relative X-ray analysis of a normal area gave three peaks C, Al, and O. The magnitude of the peaks compared as C > Al > O, also the darker areas gave the same relative C > Al > O.
Lamina thin straw
The relative X-ray analysis of a normal area (light gray) gave three peaks C, Al, and O. The magnitude of the peaks compared as Al > C > O. The dark spots showed O > Al > C or O = Al > C . White spots are Ca = C = O > Al > P
Lamina thick straw
The relative X-ray analysis of a normal area gave one peak: Al. The white dots are Fe
Conclusion at 2am
It might be that the dark gray areas seen on the kapton and Lamina-thin straws after radiation are due to the same process. They appear to be a higher concentration of (Al?)O indirectly induced by radiation. This process takes time and it looks that after 3 years of normal (low radiation) operation of a stone kapton straw a difference (darker gray areas) can be observed with the EM but not with the X-ray analysis. As after an equivalent of 44 years of radiation the straw (Lamina-thin and kapton) shows a big increase in dark areas or "black pits" the straw is still operational. It hints that although the aLuminum layer of the Lamina-thin straw "degrades" after being exposed to radiation, this process is too slow to harm operation during the running period of GlueX. The Lamina-thick straw does not show any effect at all.