Clear Fiber Bundle Health/Status

A summary of all of the testing results of the Clear Fiber bundles since the start.

Criteria for passing (somewhat arbitrary, but based on results from the 3 bundles used in Run 17 that were deemed "good"):

• Average transmission of above -65%
• No single fiber in a bundle has transmission below -75%

Bundles to use in Run 18:

FB#	Status	Comments	Average	Max	Full Sheet
1	Healthy	First bundle; repolished twice	-63%	-68%	FB01
2	Healthy	Results from 2nd test; avg unchanged from first test	-55%	-62%	FB02
3	Healthy		-54%	-67%	FB03
4	Healthy		-63%	-73%	FB04
5	Healthy		-62%	-71%	FB05
6	Healthy	Repolished once	-62%	-68%	FB06
7	Healthy		-61%	-73%	FB07
8	Healthy	Repolished 3 times	-63%	-72%	FB08
9	Healthy		-64%	-71%	FB09
10	Healthy		-62%	-68%	FB10
11	Healthy		-62%	-73%	FB11
13	Healthy	Repolished 3 times	-64.8%	-73%	FB13
14	Healthy		-62%	-73%	FB14
15	Healthy		-62%	-73%	FB15
16	Healthy		-62%	-73%	FB16
17	Healthy		-63%	-70%	FB17
18	Healthy		-61%	-69%	FB18
19	Healthy		-63%	-68%	FB19
20	Healthy	Repolished twice	-64%	-69%	FB20
21	Healthy		-64%	-72%	FB21
23	Healthy	Repolished once	-63%	-72%	FB23
24	Healthy		-63%	-74.6%	FB24
26	Healthy		-62%	-66%	FB26
27	Healthy		-57%	-68%	FB27

Failing Bundles that can still be used in Run 18 in an emergency:

FB#	Status	Comments	Average	Max	Full Sheet
22	Injured	Failing upon retest. Not sure what's going on	-61%	-77%	FB22
12	Injured	Single fiber glows on both ends, possibly cracked	N/A	N/A	N/A
28	Injured	Failing final test. Also even/odd difference of 6%	-61%	-78%	FB28

Bundle Under Construction: FB25 (Broken splitter; construction not completed, but can be fixed and polished for the future if needed)




In summary, at the moment we have:

• 24 Passing Bundles (FB1-FB11, FB13-FB21, FB23-FB24, FB26-FB27)
• 3 Failing Bundles (FB28 has a fiber at -78%; FB12 has a fiber glowing on either end, so it was set aside. Has never been fully tested, but the glowing fiber was actually passing testing; FB22 failing upon retest; 2 fibers below -75%)  
• 1 Incomplete bundle (FB25 had a tube splitter that broke. It can be fixed, polished and used, but of course should only be used as a last resort)

Google Spreadsheets for posterity:

Fiber by Fiber testing of every bundle: https://docs.google.com/spreadsheets/d/1rs-XOkZjJQz_nzMzTgH1vVVI4Ck12OCSJ_Dc_WHTaK8/edit#gid=0

Fiber Bundle Status Summary: https://docs.google.com/spreadsheets/d/1u5dWDUeguvjiPTBiH32b--NCzr-gS7l-ocCTeo5hBF0/edit#gid=0

FEE, SiPM, RX board Health Status

USTC has done a fantastic job of collecting and systematically posting their QA and characterization tests here.  They cover

• FEE boards
• SiPM cards
• Receiver cards

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!