sPHENIX tracking discussion

["Hughes, Charles [PHYSA]" <chughes2 AT IASTATE.EDU>]

Hello sPHENIX TPC crew

I am pleased to report to report that the sPHENIX TPC has finished its full round of in-detector pedestal testing. Although pedestal was assessed on the test bench for each FEE card, and some noise data had been taken at Stony Brook University in November and December, this is the first time the TPC had its noise profile taken while fully inserted into sPHENIX. This in-detector pedestal testing was of the highest priority as any issues which were discovered had to be fixed before our access to the FEE cards became limited by INTT ROC installation.

This was an arduous process supported by the hard work of many people at many institutions. While many contributed, I would like to point out some people in particular, John Kuczewski, Evgeny Shulga, Henry Klest, Ross Corliss, John Haggerty, Takao Sakaguchi, Jin Huang, and Martin Purschke. Thank you very much for all of your hard work, especially during the long hours of the night.

Regarding the performance results:

We have a total of 256 channels in 26 FEE cards in 24 sectors making a total of 159744 channels. We see a total "live channel" rate of about 97.98 % across the whole detector. The sector-by-sector live channel fraction is shown below.

The dead channels in this case are mostly caused by "stuck ADCs" or channels which read a constant ADC value over time. While some of these are unavoidable, we are confident we can improve our firmware to reduce this further. In addition, there are also configuration issues with the SAMPA chips which result in poor quality noise data on occasion. This issue we can also work out. The only other outstanding issue is FEE ID 14 in all sectors which, because of firmware issues, was not able to be consistently read out. This will also be fixed.

The noise distribution of every channel in the detector is shown below - consistent with an average value of about 2 ADCs per channel:

Finally, much work was done in the course of this pedestal testing as connectivity issues/bad FEE cards were found. I am appending a list of the work done, who did it, and links to the record in the tpc-electronics mattermost chat. In addition, .pdf files are attached with a record of the noise data for each sector across all firmware versions.

Thanks again to the entire TPC crew for making all of this happen. Any feedback is welcome.

________________________________________________________________________

* Sector 4 – (not sure what was done) – Takao Sakaguchi – 02.15.23

https://chat.sdcc.bnl.gov/sphenix/pl/tgmu4n6cp7bomnt7zu786yuuoc

* Sector 16, 2 FEEs - (switched to unused LV cables) – Takao Sakaguchi – 02.16.23

https://chat.sdcc.bnl.gov/sphenix/pl/54cc5f9i1tgj7p4ocbk4rkd86e

* Sector 5 fiber ID 5 – (replaced) – Takao Sakaguchi and Ross Corliss – 02.17.23

https://chat.sdcc.bnl.gov/sphenix/pl/xr8u8o8t1td7ujadu6ssginq9a

* Sector 13 – (fixed loose connection) – Takao Sakguchi – 02.24.23

https://chat.sdcc.bnl.gov/sphenix/pl/pj18oj8trpd9xf8cjfnkmfmd6e

* Sector 11, FEE next to HV card – (replaced) – Henry Klest and Evgeny Shulga – 02. 25.23

https://chat.sdcc.bnl.gov/sphenix/pl/mhuuqe3antro7kd9xtxbmm1qey

https://chat.sdcc.bnl.gov/sphenix/pl/d15yngtk7pgh9dk6teerofkreo

* Sectors 13 & 14, Fibers – (tightened) – Jin Huang – 03.01.23

https://chat.sdcc.bnl.gov/sphenix/pl/uwmufwqqppbwbm86c9ax8bpa9o

* Sector 21 FEE streaming ID 3 & 5 (firmware 21f1523c) – (LV cables replaced) – Takao Sakaguchi – 03.01.23

https://chat.sdcc.bnl.gov/sphenix/pl/kpd6zi3m6t8itej3ebukchm6ja

* Sector 6 FEE in R3 – (push in) – Takao Sakaguchi – 03.02.23

https://chat.sdcc.bnl.gov/sphenix/pl/1zud9j78n3gd5qaw3n4aeop48h

https://chat.sdcc.bnl.gov/sphenix/pl/kiujm4oyttf8jp1i1h4q41xpsr

* Sector 6 FEE ID 7 in R3 – (push in) – Henry Klest - 03.03.23

https://chat.sdcc.bnl.gov/sphenix/pl/9so3x8tfdp8yfbyihsrw47ys6y

https://chat.sdcc.bnl.gov/sphenix/pl/mdczrojd13nntyc9osw6qxdyew

* Sector 5 FEE ID 9 and 23 in R3 – (push in) – Henry Klest – 03.03.23

https://chat.sdcc.bnl.gov/sphenix/pl/53fa1wz51bftirkey3zsa1efja

https://chat.sdcc.bnl.gov/sphenix/pl/r4bce657eiyzug3bxwy7awtoby

https://chat.sdcc.bnl.gov/sphenix/pl/mb4njm3prbg6xmpbdepzy34aco

* Sector 2 FEE ID 11 – (replaced) – John Kuczewski and Evgeny Shulga – 03.03.23

https://chat.sdcc.bnl.gov/sphenix/pl/1ji8d3nm9pb5uxehaf9g63kooh

https://chat.sdcc.bnl.gov/sphenix/pl/su1bssms63du3euaau43d5a4uy

* Sector 1 FEE ID 4 – (push in) – John Kuczewski – 03.03.23

https://chat.sdcc.bnl.gov/sphenix/pl/6cuh1p1xx3gdfcsg4b4xh5ou6a

https://chat.sdcc.bnl.gov/sphenix/pl/58cya84q5idgfcxrqcuqoq5pzo

* Sector 5 FEE ID 2 – (push in) – Henry Klest – 03.04.23

https://chat.sdcc.bnl.gov/sphenix/pl/z49owiaeb3n8unijfepxao6q5w

https://chat.sdcc.bnl.gov/sphenix/pl/exsdur1mc7yb5pt7my4tzs93cy

https://chat.sdcc.bnl.gov/sphenix/pl/fydppd8rnfyk7nnk7hajdkzcfy

* Sector 15 FEE ID 4, 14 – (physically turned off and on) – Takao Sakaguchci and Evgeny Shulga – 03.09.23

https://chat.sdcc.bnl.gov/sphenix/pl/zy5pary6kfds7mxqpxtkfg448h

https://chat.sdcc.bnl.gov/sphenix/pl/hotuzmqsn7nkunsztpi8t9d1dy

* Sector 00 LV Cables – (plugged in) – Takao Sakaguchi – 03.09.23

https://chat.sdcc.bnl.gov/sphenix/pl/85ezjw5tfprp3qcsr5cfb5mydr

* Sector 4 FEE ID 20 – (push in) – Takao Sakaguchi – 03.09.23

https://chat.sdcc.bnl.gov/sphenix/pl/69yy7445ibrb3r7fg3xdqa8boh

* Sector 10 LV Cable TPC side – (replaced) – Takao Sakaguchi and John Haggerty and John Kuczeswski – 03.10.23

https://chat.sdcc.bnl.gov/sphenix/pl/5ug69gmyyfg7pjxf7ei68umasa

Attachment: South_Side_Retaking_TPC_Noise_Taking.pdf
Description: South_Side_Retaking_TPC_Noise_Taking.pdf

Attachment: North_Side_Retaking_TPC_Noise_Taking.pdf
Description: North_Side_Retaking_TPC_Noise_Taking.pdf