Difference between revisions of "Visual inspection"
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# Broken lead glass, see Fig. 1 (module taken from the FCAL prototype) | # Broken lead glass, see Fig. 1 (module taken from the FCAL prototype) | ||
#* some problems can be seen by looking on the lead glass block from the side opposite to the PMT | #* some problems can be seen by looking on the lead glass block from the side opposite to the PMT | ||
| − | #* lead glass module has to be disassembled | + | #* lead glass module has to be disassembled; the glass block has to be replaced. |
# Issues with wrapping | # Issues with wrapping | ||
#* small damages (holes) of the Aluminized mylar, See Fig. 2. Can be fixed using Al sticky tape, thickness < 20 um | #* small damages (holes) of the Aluminized mylar, See Fig. 2. Can be fixed using Al sticky tape, thickness < 20 um | ||
#* Al layer in the wrapping foil peels off or adheres to the glass block (penetrates into the block): | #* Al layer in the wrapping foil peels off or adheres to the glass block (penetrates into the block): | ||
#** Al layer peeled off resulting in some transparent holes in the wrapping. | #** Al layer peeled off resulting in some transparent holes in the wrapping. | ||
Revision as of 10:56, 18 October 2022
Fig. 1 Broken glass
Fig. 2 Wrapping issue: teared Aluminized mylar, can be fixed without disassembling module
Fig. 3 Wrapping issue: Al layer peeled off
Fig. 4 Wrapping issue: Al layer peeled off, teared wrapping foil
Fig. 5 Damaged PMT
Fig. 6 Colored lead glass module, possible radiation damage issue. Can be seen without removing steel flange.
Fig. 7 Colored lead glass module
Possible issues with lead glass module
- Broken lead glass, see Fig. 1 (module taken from the FCAL prototype)
- some problems can be seen by looking on the lead glass block from the side opposite to the PMT
- lead glass module has to be disassembled; the glass block has to be replaced.
- Issues with wrapping
- small damages (holes) of the Aluminized mylar, See Fig. 2. Can be fixed using Al sticky tape, thickness < 20 um
- Al layer in the wrapping foil peels off or adheres to the glass block (penetrates into the block):
- Al layer peeled off resulting in some transparent holes in the wrapping.
