QC6: Quantitative Test and Certification3
Ext. Barrel Module IFA029 - DAQ Run Number =1385
- DAMAGED FIBER: We have found some damaged fibers. A fiber (cell A13) had a crack inside the fiber at the end glued into the aspirin tube . Another two fibers (cell B13 and D_4) had a little crack too. All af them were replaced with spare ones. We found two fibers (in cell A12 and cell B15) that their surfaces were scratched. The first one was replaced using the teflon tube hole and the second one was replace with a spare one.
TileRow |
Drop Before Repairing |
Drop After Repairing |
|
PMT 11 - Cell A13 - Fiber# 21 |
1 |
36.5% |
<20% |
PMT 11 - Cell A13 - Fiber# 21 |
3 |
35.4% |
<20% |
PMT 7 - Cell A12 - Fiber# 6 |
1 |
36.7% |
<20% |
PMT 7 - Cell A12 - Fiber# 6 |
3 |
32.4% |
<20% |
PMT 43- Cell B15- Fiber# 9 |
4 |
21.0% |
<20% |
PMT 43- Cell B15- Fiber# 9 |
6 |
23.8% |
<20% |
PMT 23- Cell B13- Fiber#11 |
4 |
21.4% |
<20% |
PMT 23- Cell B13- Fiber#11 |
6 |
22.8% |
<20% |
PMT 3- Cell D_4- Fiber#3 |
10 |
23.7% |
<20% |
SCINTILLATOR PROBLEM: We observed problems related to Tile Transparency. In these cases the two fibers coupled to each side of these tiles have a similar light lost (correlation Left-Right). These problems can be solved by replacing the tiles :
TileRow |
Drop Before Repairing |
Drop After Repairing |
|
PMT 37 - Cell D_6 - Fiber# 12 |
11 |
23.1% |
<20% |
PMT 38- Cell D_6 - Fiber# 12 |
11 |
23.4% |
<20% |
PMT 37 - Cell D_6 - Fiber# 13 |
11 |
29.1% |
<20% |
PMT 38- Cell D_6 - Fiber# 13 |
11 |
21.3% |
<20% |
-COUPLING REPAIRED: A profile was extracted and put it again. The drop after this operation is below the 20% threshold. - Drop Recovered.
TileRow |
Drop Before Repairing |
Drop After Repairing |
|
PMT 41 - Cell A16 - Fiber# 23 |
3 |
22.2% |
<20% |
-PAINTING IN THE PLASTIC TUBE : We found a little of black painting on the plastic tube at this location. The tube was replaced.
TileRow |
Drop Before Repairing |
Drop After Repairing |
|
PMT 3 - Cell D_4 - Fiber# 3 |
11 |
22.8% |
<20% |
Files: raw_run1367.hbook - hist_run1367.ps - hist_run1385.ps - raw_data_run1385.ps - OPTICAL PROBLEMS RUN1367.txt - OPTICAL PROBLEMS RUN1385.txt
Olga Norniella (onorni@ifae.es)
Carmen Iglesias (iglesias@ifae.es)
Ilya Korolkov (korolkov@ifae.es)