Difference between revisions of "Visual inspection"

Revision as of 11:02, 18 October 2022

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

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) in the Aluminized mylar, see Fig. 2. This can be fixed by using Al sticky tape, thickness < 20 um
- Aluminum layer in the wrapping foil peels off or adheres to the glass block (penetrates into the block):
  - Fig. 3 and Fig. 4: Aluminum layer peeled off resulting in some transparent holes in wrapping.
  - Recommend to disassemble and re-wrap the lead glass block

@@ Line 23: / Line 23: @@
 #*  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
+#* small damages (holes) in the Aluminized mylar, see Fig. 2. This can be fixed by 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):
+#* Aluminum 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.
+#** Fig. 3 and Fig. 4:  Aluminum layer peeled off resulting in some transparent holes in wrapping.
+#** Recommend to disassemble and re-wrap the lead glass block