EPD Run by Run QA 2018

Isobar run by run QA: drupal.star.bnl.gov/STAR/blog/jewigleb/epd-isobar-2018-run-list

EPD racks in plat form

EPD uses 1C2 and 1C3 racks in the south platform:
Here is the drawing of the racks:

Mapping

Pre- and post-beam commissioning

1. Pre-post checking, to make sure we are in same bin as BBC.  DONE
   • Instructions - Rosi has agreed to elaborate a bit more (mal 15feb2019)
   • check by Rosi
2. Verify proper mapping from TUFF to StEvent (tests databases, cabling...)  ("Seven Patterns" test) DONE
   • Instructions
   • final test by Joey and Prashanth
3. Vped adjustment   DONE
   • Instructions and context (written in 2019)
     
   • root macro used to do the adjustment
   • root macro used to analyze the Vpeds
   • adjustment performed by Rosi based on data taken by Prashanth and Joey
4.  I-V scan has been done about once/day   DONE
5. Confirm data goes from QT32C to TCU 
   
   • this is important for TRIGGER readiness, but not for PHYSICS readiness
   • Prashanth or Rosi need to write up the purpose and instructions here.

1. (Re-)confirm pre-post timing  (it's easy and it's important)
   
   • Same instructions as item #1 above.
     
2. Timing scan    DONE
   • Instructions and results for this year
3. Bias scan   DONE
   • Instructions and results for this year

SW FEE box Removal

Trigger Commissioning

EPD Trigger is very similar to BBC, except EPD uses hit count instead of ADC sum for trigger.
Trigger layers:

1. 14 QTC boards with TAC, 108 TAC tiles for each east and west.
2. Layer zero: EP001(east) & EP002(west) DSMs.
3. Layer one: EP101 DSM.
4. Layer 2: Vertex DSM
5. TCU bits EPD-E, EPD-W, EPD-TAC; corresponding to number of good hits above hit count threshold and in TAC window.

Useful links:

1. Trigger Algorithm document (Explains the algorithms in QTs and DSMs for triggering)
2. Cheat sheet of QTs and DSMs
3. EPD QT mapping (please see the excel sheet at the end)
4. EPD online monitoring (Has summary plots, ADC & TAC distributions, bit map checking)

EPD trigger shows some mismatch (few percent to 20%) from QTC to L0 DSM.
Issue is more likely the Algorithm and/or output latch issues and can not be hardware issue (Many thanks to Steve and Jack fixing hardware issues).

Current Tier1 file is set to provide EPD-E, EPD-W and EPD-TAC
To test the trigger capabilities of EPD following runs are taken only with triggers: EPD-E + EPD-W + EPD-TAC
19075034 (short run)
19075035 (long run)
19075053 (during the vernier scan, very long run)

Following thresholds are used in above runs:

1. 300 < TAC < 4000
2.  16 < ADC
3. All the QTC boards are enabled to pass
4. A TAC difference is between 3895 and 4295 applied (corresponding to ~ 30 cm).
5. Hit count is required to have greater than 0 for both east and west.

Following are some QA plots from run 19075035

EPD TAC difference East vs. West	(a)Earliest TAC East, (b) Earliest TAC west, (c) TAC diff. Blue histo is calculated from QTs and Red is from EP101 So the difference between red and blue tells the bits mis-match!
Hit count from Ep101, Note that we have 108 TAC channles	Top left panel is for BBC only, rest compare BBC with EPD

Applied cut is doing its job on selecting events from ~30 cm cut.

Now the issues:
EP001 and EP002 shows earliest TAC of 0x20, 0x800 and 0x820 for east and west for about 5-20% of the time for all the QTC boards.
Please following bit map check plot, plot compares mis-match from QTC algorithm against bits received by EP001/2. Bits mismatch at 0x20, 0x800 and 0x820 clearly visible.
For 19075034

This gives peak TAC difference centered around 4096 (0x800-0x800 or 0x820=0x820 or 0x20-0x20, plus 4096)
   and 0x20 above and below 4096 for 0x800 and 0x820 combos.
Following plot from low statistic run 19075034

We confirmed that when there is no good hit in QT, no output is generated from QT algorithm or in EP001/2.

Current proposal is to include EPD trigger in production running with limited band with and play with QT algo latches and output latches.
Any thoughts, comments or suggestions?

What supersector, fiberbundle, FEE, and SiPM is where?

• You can click on the Supersector number to see ADC spectra from test stand cosmic runs.  More complete information on SS health can be found on this page.
• Click on the Fiberbundle number to see results of transmission tests.  More complete information on FB health can be found on this page.
• On 22 June 2018, Mike has filled in the SiPM# information based on BNL logbook page 102, which was filled between 20 Jan and 4 Feb 2018.

Not listed in the table above (i.e. not used in run 2018):

• 12 of the 60 FEE cards produced: 03, 06, 08, 09, 13, 18, 33, 34, 35, 36, 39, 54
  
  • #18 had been installed originally but didn't communicate.  Tim has since repaired it and returned it to EPD group
  • End-of-run inventory June 2018:  12 "spare" FEEs are in cabinet, but one has no label on it.  All numbers except for #35 were found on the spare labels, so presumably the un-labeled spare is #35.
  • So, all 60 FEEs are accounted for, at end of run 2018.
  • Mike is taking four FEEs (#33,34,36,39) to Ohio for summer 2018

• 13 SiPM cards of the 60 SiPM cards produced:  01, 17, 28(bad), 30, 31, 39, 40, 41, 42, 44, 45, 48, 54
  
  • note that one card listed in the table had no number, so presumably one of the 13 listed above is actually in the experiment.
  • End-of-run inventory June 2018: 12 "spare" SiPMs accounted for, in total
    
    •  all numbers on the list above are identified, except 01, 17, 44.  However, we have one in the experiment un-numbered, and two from Tim simply labeled "1" and "2" on the bag.
  • Bottom line: all 60 SiPM cards are accounted for, at end of run 2018, except we have three un-numbered cards who are certainly 01,17,44, but we don't know exactly which is which.  No big deal.
  • Mike is taking four SiPM cards (#40, 41, 45, 48) to Ohio for summer 2018

• 7 of the 31 SS produced: 08, 13, 16, 17, 18, 26, 28
  • already discussed on this page

Here is a handy map to help reproduce the fiber placement in run 2019.   A high-resolution PDF file is here: drupal.star.bnl.gov/STAR/system/files/Setup2018.pdf