Supersector and Tile Health/Status

This page records the health status of the 31 Supersectors.  (Well, SS28 was dropped, so there are only 30, but we keep the numbering.)

Results of cosmic tests at OSU in Aug-Sept 2017 (4 SS in a stack), and BNL in Nov 2017 - Jan 2018 (3 SS in a stack).

The health sheets may be found here.  (Also see "how to read a health sheet".)


Health status before run 2018 based on cosmic tests and cross-talk scan
SS status comments ADC spectra
1  healthy  hey, our much-maligned "first pancake" actually looks great!  160131
2  healthy    020304
3  healthy    020304
4  healthy  a bit less light than some others, but it worked well in run 2017  020304
5  healthy  (taking another look at TT26 jan2018, to be sure, but it's fine)  08050607
6  healthy  (taking another look at TT26 jan2018, to be sure, but it's fine)  08050607
7  healthy    08181007
8  injured  TT05 very low gain, probably unusable  14081516
9  healthy  TT03 has low gain  06091417
10  healthy    08181007
11  healthy    09111213
12  healthy  ADC spectra in test looked a little strange  09111213
13  injured  MAY be usable.  X-talk b/t TT01,03; glued WLS fibers  09111213
14  healthy    06091417
15  healthy  ADC spectrum for TT20 a little strange; see notes  14081516
16  injured TT02 has very low gain.  Had suspected paint on fiber end, but problem persists after cleaning  161731
17  prob. healthy  Joey should comment on X-talk issue; see health sheet  161731
18  injured  TT03 broke during construction.  low gain.  PERHAPS viable  08181007
19  healthy    17181920
20  healthy    17181920
21  healthy  TT21 ADC distribution a bit abnormal  212930
22  healthy    21222426
23  healthy    252723
24  healthy    21222426
25  healthy    252723
26  healthy enough
  TT03 has rather low gain, but probably usable. I'm comfortable with this in the experiment.  21222426
27  healthy  see notes for comments on TT24,25,27-31  252723
28  dead  dropped and broken in pieces :-(  
29  healthy  TT27 has low gain  212930
30  healthy    212930
31  healthy    161731

According to this table we have
  • 24 healthy (1-7, 9-12, 14, 15, 19-25, 27, 29-31)  We'll use these in Run 2018.
  • 2 healthy "enough" to use in experiment (17, 26)
  • 4 injured: if we need to swap in, take them in the following order
    • SS16 has low-gain TT02, but maybe usable.  Take this first if needed.
    • SS08 and SS18 each have one tile with low gain that are likely unusable.
    • SS13 has cross-talk in small tiles due to glued WLS fibers.  May be usable
  • 1 dead (SS28).  Don't use this one.
For the experiment, we need 24 SS, so we are in good shape: 100% of our 744 tiles are good!