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  1. Trigger session report ByungGu Cheon Hanyang University 19 March, 2009 2nd Open Meeting of the Super KEKB Collaboration

  2. S. Ryu Belle sBelle sBelle calorimeter trigger 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

  3. Test bench for Shaperboard S. Ryu New Shaper Board

  4. S. Ryu • 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

  5. S. Ryu • Noise level test with cosmic data → okay pedestal (mean value) 26 ch for 160 MeV ch ch peak RMS =1.58 ~ 10 MeV 6 ch ch

  6. Problem in g4superb(?) Y. Unno • 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 Logarithm scale hadron interaction effect in g4superb-ecl is strange??? November 6, 2014 7 Y.Unno

  7. Effect of beam bkg Y. Unno • 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) November 6, 2014 8 Y.Unno

  8. Effect of beam bkg Y. Unno Random triggered event under x20 bkg will be all triggered as physics event?! November 6, 2014 9 Y.Unno

  9. APV25, Clock and Trigger M. Friedl 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

  10. M. Friedl Summary • 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

  11. E. Won

  12. E. Won

  13. Y. Iwasaki

  14. Y. Iwasaki

  15. Y. Iwasaki

  16. Y. Iwasaki

  17. Backup

  18. Tsim-ecl with Belle and sBelle Y. Unno B Kp / Bp0p0 / Br0g / Btn /tmg / eeX(214)(mm)g Without beam background gsim g4superb Super-Belle geant3 geant4 Belle tsim-ecl sBelle tsim-ecl Belle ecl performance sBelle ecl performance November 6, 2014 19 Y.Unno

  19. Check with single track Comparison between w/ and w/o inner detector Note that there is no difference between w/ and w/o inner detector for gsim too.

  20. Effect of beam bkg