Trigger session report
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Transcript of Trigger session report
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Trigger session report
ByungGu Cheon Hanyang University
19 March, 2009
2nd Open Meeting of the Super KEKB Collaboration
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sBelle calorimeter trigger
Belle
sBelle
Feature : Much simpler electronics chain (2 steps) than Belle
More flexible trigger algorithm design than Belle
1st step (FAM) : 10MHz/12bit FADC + FPGA
2nd step (TMM) : cascade/partitioning FPGAs
Bulky copper cables 52 optical fibers
Simple monitoring scheme
Simultaneous handling of CsI(Tl) and pure-CsI signals
Current status : We now investigate fast shaping signal from new Shaper.
FAM core firmware algorithm has been tested.
TSIM MC study has been performed w/ g4superb.
Plan : FAM/TMM prototypes will be ready by June.
Basic test of Shaper/FAM/TMM readout chain
Under real environment before Belle shutdown
S. Ryu
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Test bench for Shaper board
New Shaper Board
S. Ryu
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Department of Physics & Astronomy, Seoul National UniversityDepartment of Physics & Astronomy, Seoul National University
๏ Gain Test for fast shaping output :6 bits are reserved for the gain adjustment. → enough
๏ Undershoot tail has been corrected with pole-zero cancelation → okay
S. Ryu
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Department of Physics & Astronomy, Seoul National UniversityDepartment of Physics & Astronomy, Seoul National University
๏Noise level test with cosmic data → okay
RMS =1.58
~ 10 MeV
26 ch for 160 MeV
6
pedestal (mean value)
peak
ch ch
chch
S. Ryu
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Problem in g4superb(?)
April 20, 2023 Y.Unno 7
Logarithm scale
Single tracks( / e- / - / - / K+) are checked for gsim and g4superb. Generate p=5GeV/c single track in CM isotrapically. Without beam background Check only Barrel region
hadron interaction effect in g4superb-ecl is strange???
Y. Unno
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Effect of beam bkg
April 20, 2023 Y.Unno 8
Check tsim response for signal MC with “beam background”. “beam background”(addbg) is real random-triggered data. Used here is exp.51 data: 2006/04-06(peak L =~ 16x1033/cm2/sec)
Y. Unno
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Effect of beam bkg
April 20, 2023 Y.Unno 9
Random triggered event under x20 bkg will be all triggered as physics event?!
Y. Unno
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APV25
• Please refer to my December 2008 meeting slides for details about APV25 (SVD session)
• In Nov/Dec 2008 beam test, we confirmed that APV works perfectly fine with both – 42.4 MHz clock (=RF/12) 3.5 µs max L1 latency– 31.8 MHz clock (=RF/16) 4.7 µs max L1 latency
• We can make the APV25 clock switchable
Schematics of one channel
M. FriedlAPV25, Clock and Trigger
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• APV25 has trigger limitations due to (1) Minimum L1 distance of 6 APV clocks(2) Maximum pipeline filling
• APV25 trigger simulation was performed to estimate dead time.• In case of no external limitation, we get @ 30kHZ L1:
– 0.87% for 42.4MHz clock, 3.43% at 31.8MHz (see December slides for more detail)
• With 500ns time jitter as estimated by CDC trigger we get– 0.42% for 42.4MHz clock, 2.7% at 31.8MHz– Conclusion: With 500ns CDC trigger jitter, both frequencies
are fine according to Nakao-san‘s wish of <3% APV25 dead time @ L1=30kHz
SummaryM. Friedl
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E. Won
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E. Won
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Y. Iwasaki
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Y. Iwasaki
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Y. Iwasaki
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Y. Iwasaki
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Backup
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Tsim-ecl with Belle and sBelle
April 20, 2023 Y.Unno 19
eeX(214)
Without beam background
Belle ecl performance sBelle ecl performance
Super-Belle
Belle tsim-ecl sBelle tsim-ecl
geant3 geant4
Y. Unno
g4superbgsim
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Check with single trackComparison between w/ and w/o inner detector
Note that there is no difference between w/ and w/o inner detector for gsim too.
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Effect of beam bkg
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