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Luminosity and radiation thickness
PVDIS
50uA, LH target, 40cm, 0.071g/cm3, X=40/890.4=4.5e-2, Lumi=50e-6/1.6e-19*40*0.071*6.02e23=0.53e39/cm2/s LD target, 40cm, 0.169g/cm3, X=40/745.4=5.4e-2, Lumi=50e-6/1.6e-19*40*0.169*6.02e23=1.27e39/cm2/s Al window, 2*100um, density 2.7g/cm3, X=2*100e-4/8.897=2.25e-3, Lumi=50e-6/1.6e-19*2*100e-4*2.7*6.02e23=1e37/cm2/s
SIDIS He3
15uA 3he(10amg), 40cm, density=10*44.6(amg=mol/m3)*3.016(g/mol)=1.345e-3g/cm3, X=40/(67.42/1.345e-3)=0.8e-3, Lumi=15e-6/1.6e-19*40*1.345e-3*6.02e23=3e36/cm2/s, pol Lumi = 3e36/3 = 1e36cm2/s GE180 glass window, 2*120um, density 2.76g/cm3, X=2*120e-4/(19.4/2.76)=3.4e-3, Lumi=15e-6/1.6e-19*2*120e-4*2.76*6.02e23=3.74e36/cm2/s
GE180 Aluminosilicate Glass Composition, refer to http://galileo.phys.virginia.edu/research/groups/spinphysics/glass_properties.html Molecule Composition by weight SiO2 60.3% BaO 18.2% Al2O3 14.3% CaO 6.5% SrO 0.25% Z/A 0.4829 radiation thickness 19.4246 g/cm2 radiation thickness 7.038 cm density 2.76 g/cm3 assume Z=17 and A=35,which gives correct Z/A, then we got nuclei luminosity for each window 3.74/2/35=0.054e36/cm2/s
SIDIS proton
I = 100nA, Target = NH3, density of NH3(den) = 0.819 g/cm^3 target thickness (t) = 2.826 cm, packing fraction(PF) = 0.55 NH3 target is immersed in liquid He4, density of LHe4 = 0.145 g/cm^3 at 1K Luminosity of NH3 = den * t * PF * (I/1.602e-19)*6.022e23 = 0.819*2.826*0.55*(100e-9/1.602e-19)*6.022e23 = 4.785e35/cm2/s pol Lumi = 4.785e35/17*3 = 0.844e35/cm2/s Luminosity of LHe4 = den * t * (1-PF) * (I/1.602e-19)*6.022e^23 = 0.145*2.826*0.45*(100e-9/1.602e-19)*6.022e23 = 0.69e35/cm2/s Luminosity of two LHe4 outside = 0.145*2*0.432*(100e-9/1.602e-19)*6.022e23 = 0.47e35/cm2/s Total luminosity = (4.785+0.69+0.47) * 1e35 = 5.945e35/cm2/s Note: there are several thin Al windows, but their luminosities are small
total length of NH3+LHe4 and two LHe4 outside, 2.826+2*0.432=3.69 average density of NH3+LHe4, (0.819*0.55+0.145*0.45) = 0.5157 average density of NH3+LHe4 and two LHe4 outside, (0.5157*2.826+0.145*2*0.432)/(2.826+2*0.432)=0.43 Composition by weight of NH3+LHe4 and two LHe4 outside NH3 0.819*0.55*2.826/(2.826+2*0.432)/0.43=0.80 LHe4 0.145*0.45*2.826/(2.826+2*0.432)/0.43=0.12 two LHe4 outside 0.145*2*0.432/(2.826+2*0.432)/0.43=0.08 average Z=10*0.80+2*0.12+2*0.08=8.4 average A=17*0.80+4*0.12+4*0.08=14.4 Z/A=0.583 assume Z=7 and A=12,which gives correct Z/A, then we got nuclei luminosity 5.945e35/12=0.495e35/cm2/s
JPsi
3uA LH target, 15cm, 0.071g/cm3, X=15/890.4=1.7e-2, Lumi=3e-6/1.6e-19*15*0.071*6.02e23=1.2e37/cm2/s Al window, 2*100um, density 2.7g/cm3, X=2*100e-4/8.897=2.25e-3, Lumi=3e-6/1.6e-19*2*100e-4*2.7*6.02e23=6e35/cm2/s
rate
The result is at /work/halla/solid/evgen
SIDIS e and hadron rate
generated by "collider", the code and script for analyzing result are at https://jlabsvn.jlab.org/svnroot/solid/evgen/collider
The result is here
single particle rate
various particle from vertex is estimated by "eicRate" in our event generator repository. The code and script for analyzing result are at https://jlabsvn.jlab.org/svnroot/solid/evgen/eicRate_20101102 https://jlabsvn.jlab.org/svnroot/solid/evgen/eicRate_20101102/output
rate study
pdf Comparison with 6GeV transversity data by Xin Qian
pptx pdf event generator rate comparison, study by Zhiwen Zhao and Zhihong Ye
pdf study by Nguyen Ton and Xiaochao Zheng (outdated)
other staff
PVDIS Geant4 modeled background from Target
Rates and flux from GEMC for PVDIS follow. Validation against GEANT3 can be found here: Compare_to_geant3_result.
Rates on GEMs for 50uA on LH2. Solid lines are unbaffled, dashed are with lead baffles:
Flux in EM calorimeter for 50uA on LH2. Solid lines are unbaffled, dashed are with lead baffles. The true rate should be taken from the black lines.
SIDIS Geant4 modeled background from Target
<math>\pi</math>/e Ratio
See here
