PVDIS EC trigger update Zhiwen Zhao 2013/08/27. 3.0GeV 2.5GeV 2.0GeV Current trigger setting.

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Presentation transcript:

PVDIS EC trigger update Zhiwen Zhao 2013/08/27

3.0GeV 2.5GeV 2.0GeV Current trigger setting

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

Rate: Log(Ek)(GeV) vs R(cm) Kryptonite baffle Before trigger After trigger e(DIS) pi-(DIS) pi+(DIS) gamma(pi0(DIS)) p(DIS)

Rate: Log(Ek)(GeV) vs R(cm) Lead baffle Before trigger After trigger e(DIS) pi-(DIS) pi+(DIS) gamma(pi0(DIS)) p(DIS)

backup

PVDIS EC Trigger Setting 8/19/20137

source Z(-10,30)cm R(0,3.536)m m neutral negative positive Strong bending < 0.5GeV Sweep away < 0.2GeV Acceptance, Open

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

Process Proposal PAC34Current openbaffledOpen Baffle (smallerZ 4cm) Baffle (largerZ) e DIS total2500 kHz110 kHz7800 kHz1140 kHz830 kHz eDIS W>2GeV,x> kHz kHz650 kHz618 kHz eDIS W>2GeV,x> kHz1294 kHz24 kHz28 kHz eDIS W>2GeV,x>0.658 kHz322 kHz5.7 kHz6.7 kHz pim all MHz 1000 MHz560 MHz pim p>0.3GeV2300 MHz140 MHz MHz 740 MHz160 MHz pim p>1.0GeV460 MHz70 MHz1600 MHz270 MHz150 MHz pim p>2.0GeV26 MHz8 MHz53 MHz17 MHz18 MHz pip all MHz 1400 MHz1200 MHz pip p>0.3GeV 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<0.20 EC triggered 680 kHz102 kHz1430kHz 469 kHz 448 kHz 485kHz Pim EC triggered540 kHz120 kHz kHz kHz kHz kHz Pip EC triggered kHz kHz 226 kHz 1960 kHz Pim EC triggered, Pileup 10 kHz<2 kHz

trigger

Generator “eicRate” eDIS rate based on formula from PDG on proton or neutron eES rate based on formula on proton or neutron hadron rate based on Wiser fit – pip,pim,Kp,Km,p and p-bar on proton from Wiser fit directly – pi0 rate = (pip+pim)/2, Ks,Kl rate = (Kp+Km)/2 – pip/pim rate on proton = pim/pip rate on neutron, Kp/Km rate on proton = Km/Kp rate on neutron – p rate on proton = p rate on neutron radlen used in Wiser fit, The crosssection output from Wiser is linearly proportional to radlen. Different code uses different estimation of radlen, here is what “eicRate” uses – Intrad = 2.0*log(e_lab/ )/(137.0* ) = (for 11 GeV beam) – radlen = 0.5*rad*100.*(4.0/3.0) + intrad*100.0 = 8.22 (for 40cm LD2 target with rad=40/745.4=0.0537)

Pim/e ratio 1e2 P>2GeV, 5e2 P>1.5GeV, 1e3 P>1GeV, 5e3 P <1GeV

No cut Cut P>2GeV No cut Cut 21<theta<36