Cosmic prepost epd 2018 Part II
4 EPD based triggers were added to the CosmicLocalClock config today
epde (epd-e bit)
epdw (epd-w bit)
epdhit_cosmic_east (epe-e && tof)
epdhit_cosmic_west (epd-w && tof)
In addition, the EPD discriminator threshold was changed from 128 down to 50.
The EPD east hit count threshold was changed from 95 to 0 (which matches the west, not sure why it was so high to begin with).
Then the following runs were taken
Run 19065023 - mostly singles (epde and epdw) (all prescale = 1, prepost = 0 only for st_cosmic, prepost -1/0/1 for st_epd)
Note: Trigger IDs - epdhit_cosmic_east and west are EPD + TOF!
TRIGGER LABEL STREAM DAQ TRIGGER ID(s) OFFLINE TRIGGER ID(s) EVENTS
epdhit_cosmic_east epd 40 7 60
epdhit_cosmic_west epd 80 8 42
epde cosmic 400000000 35 14710
epdw cosmic 800000000 36 14825
There were 3395 counts with ADC > 16 indicating only about 11% are "real". Not surprising with a rate of 50 Hz, though 5 Hz may be a bit high.
The EPD Jevp are at: drupal.star.bnl.gov/STAR/system/files/19065023.shift_.pdf
Figure 1: Sum total of all the ADC counts. Looks like we're definitely seeing cosmics! (Peak at ~2000 from B boards)
Channel by channel:
Big: drupal.star.bnl.gov/STAR/system/files/Adc_big_19065023.pdf
Small: drupal.star.bnl.gov/STAR/system/files/Adc_small_19065023.pdf
Run 19065024 - mostly tof coincidences (epdhit_cosmic_*) as singles were prescaled by: 9000000
But, this only had ~60 or so events, which doesn't seem worth analyzing. Also, since the QT32Cs were in the wrong prepost (they were in prepost 1 at this point), the coincidence between epd and tof was minimal.
Run 19065028 is a standard cosmic run with
- eq1/2/3 after Jack & Stephen checked their gates.
- includes epdhit_cosmic triggers with pre1/post1 into epd-stream
TRIGGER LABEL STREAM DAQ TRIGGER ID(s) OFFLINE TRIGGER ID(s) PRESCALE EVENTS
epd_cosmic_east epd 10 5 1 1852
epd_cosmic_west epd 20 6 1 3679
epdhit_cosmic_east epd 40 7 1 204
epdhit_cosmic_west epd 80 8 1 169
EPD Jevp: drupal.star.bnl.gov/STAR/system/files/19065028.shift_.pdf
/star/u/ is down, which means no mapping and no mudsts and no picos...
Run 19065029 is a standard cosmic run with
-pre1/post1 -> pre0/psot2 for "epd-cosmic" (BBC*TOF) triggers
-pre1/post1 (unchanged) for "epdhit-cosmic" (EPD*TOF) triggers
Unfortunately, I needed prepost 0 - 2! This designation was kept for the next hours. Since Jack has changed our prepost, it's probaby not important to look at this data.
First pedestal with new prepost designation is: 19065053
First "normal" run is 19065055 (unfortunately still running prepost 0,2 which means we can't verify). I have asked Prashanth to change us back to -1,0,1 so we can verify our timing.
Looking at the Jevp plots, they have some interesting patterns:drupal.star.bnl.gov/STAR/system/files/19065055.shift_.pdf
The start of the "good" running would then be at: 19065073
- rjreed's blog
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