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PVDIS EC trigger update Zhiwen Zhao 2013/08/27 Slide 2 3.0GeV 2.5GeV 2.0GeV Current trigger setting Slide 3 Max DAQ rate 65kHz per section We need at most 21MHz EC trigger rate, refer to (21e6/30)*3e6*30e-9=63kHz Trigger rate dominated by pion, pi- is higher than pi+ Currently EC trigger rate (pion+gamma), 55MHz with Kryptonite baffle,173MHz with lead baffle (p trigger is not right, ignore it for now) Kryptonite baffleLead baffle Slide 4 Rate: Log(Ek)(GeV) vs R(cm) Kryptonite baffle Before trigger After trigger e(DIS) pi-(DIS) pi+(DIS) gamma(pi0(DIS)) p(DIS) Slide 5 Rate: Log(Ek)(GeV) vs R(cm) Lead baffle Before trigger After trigger e(DIS) pi-(DIS) pi+(DIS) gamma(pi0(DIS)) p(DIS) Slide 6 backup Slide 7 PVDIS EC Trigger Setting 8/19/20137 Slide 8 source Z(-10,30)cm R(0,3.536)m m neutral negative positive Strong bending < 0.5GeV Sweep away < 0.2GeV Acceptance, Open Slide 9 source Z(-10,30)cm R(0,3.536)m m neutral negative positive Strong bending < 0.5GeV Sweep away < 0.2GeV Acceptance, baffle 4cm Slide 10 Process Proposal PAC34Current openbaffledOpen Baffle (smallerZ 4cm) Baffle (largerZ) e DIS total2500 kHz110 kHz7800 kHz1140 kHz830 kHz eDIS W>2GeV,x>0.201500 kHz1102000 kHz650 kHz618 kHz eDIS W>2GeV,x>0.5535 kHz1294 kHz24 kHz28 kHz eDIS W>2GeV,x>0.658 kHz322 kHz5.7 kHz6.7 kHz pim all 26700 MHz 1000 MHz560 MHz pim p>0.3GeV2300 MHz140 MHz 14000 MHz 740 MHz160 MHz pim p>1.0GeV460 MHz70 MHz1600 MHz270 MHz150 MHz pim p>2.0GeV26 MHz8 MHz53 MHz17 MHz18 MHz pip all 26900 MHz 1400 MHz1200 MHz pip p>0.3GeV 14000 MHz 610 MHz280 MHz pip p>1.0GeV1600 MHz71 MHz5.3 MHz pip p>2.0GeV51 MHz0.25 MHz0.039 MHz e DIS W>2GeV,x Pim/e ratio 1e2 P>2GeV, 5e2 P>1.5GeV, 1e3 P>1GeV, 5e3 P No cut Cut P>2GeV No cut Cut 21