--
BrendanKiburg - 05 Nov 2007
Brendan's original bad wire report
ePC2 has been disassembled in order to repair the broken wires. We have looked through run 11 for other hot spots / hot wires that we should check while the chamber is open.
Anode sectors should have 32 wires , I label the wires 1-32. As we go around, in the direction of increasing sector, I start with wire 1 and end with wire 32:
Wire 1, Sector 1--Wire 32, Sector 1 -->Wire 1, Sector 2--Wire 32, Sector 2, etc...
Cathode sectors have 16 wires. The same convention is used.
Additionally, anode sectors are denoted with an A, while cathode sectors are denoted with a C.
See the attachment in
http://www.npl.uiuc.edu/elog/mucap/run11/83
for the mapping. See also the explanations in
andi.pdf.
Elog |
Date |
Run |
Anode |
I.Cath |
O. Cath |
Sector |
Wire |
Comment |
69 |
08/14 |
|
2622 |
|
|
A5 |
19 |
During setup, hot spots |
69 |
08/14 |
|
|
3375 |
|
C18 |
3 |
During setup, hot spots |
388 |
09/09 |
53133 |
2622 |
|
|
A5 |
19 |
Part of hot spot |
388 |
09/09 |
53133 |
|
3226 |
|
C8 |
14 |
Part of hot spot |
388 |
09/09 |
53133 |
|
|
3862, 3863 |
C24 |
11,10 |
hot spot, coinc on 3863, singles on 3862 |
584 |
09/25 |
58369 |
2621-2623 |
|
|
A5 |
18-20 |
Wider spot on anode |
584 |
09/25 |
58369 |
|
|
3863, 3864 |
C24 |
10,9 |
Wider spot on cathode |
875 |
10/18 |
|
|
|
3796,3804,3808 |
C28 |
16,13,5 |
Could be electronics |
875 |
10/18 |
|
|
|
3856 |
C25 |
1 |
Could be electronics |
64 |
08/13 |
|
|
|
3809 |
C27 |
16 |
pulsed mode fine, clusters missing |
64 |
08/13 |
|
|
|
3823,3824 |
C27 |
2,1 |
pulsed mode fine, clusters missing |
64 |
08/13 |
|
|
|
3825 |
C26 |
16 |
pulsed mode fine, clusters missing |
Andi's reports
Extraction of the "dead spot" wires
After consulting with Steven, I have determined how the mapping is setup and slightly tweaked the cathode settings
Based on the Illinois analysis code, it appears the dead spot centered around z = +50 mm, phi = 3 radians corresponds to the following wires and sectors:
- Anodes: 2701->2750 (Sectors A2, A1)
- Inner Cathodes: 3242->3269 (Sectors C10 and C11, a little of C9)
- wire 3242 has (z=+94 when phi = 2.8 and z=+191 when phi = 3.1)
- wire 3269 has (z=-78 when phi = 2.8 and z=+19 when phi = 3.1)
- Outer Cathodes: 3882->3912 (Sectors C23, C22 and C21 -- half of C23,C21, all of C22)
- wire 3882 has (z=-102 when phi = 3.1 and z = -7.6 when phi = 2.8)
- wire 3912 has (z=+84 when phi = 3.1 and z= +179 when phi = 2.8)
- ePC2 inefficiency:
- The 2nd image comes from run 10. It shows the location of the anodes in question. The Inner Cathode 9-10 boundary has also been drawn, however it does not appear to be parallel to the inefficient lines. This needs further understanding.
- Efficiency with sectors labeled: