Difference between revisions of "Number of electron-positron pairs/sec out of Al converte"
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===through 1 m of air=== | ===through 1 m of air=== | ||
− | <math>\sigma_{pairs} = 0.2\ \frac{barns}{atom}</math> | + | <math>\sigma_{pairs} = 0.2\ \frac{barns}{atom}</math> plot and check this number |
<math>l = 1.0\ \mbox{m}</math> | <math>l = 1.0\ \mbox{m}</math> |
Revision as of 07:56, 29 January 2011
LINAC parameters used in calculations
1) pulse width 50 ps
2) pulse current 50 A
3) repetition rate 300 Hz
4) energy 44 MeV
Number of electrons/sec on radiator
Number of photons/sec out of radiator
Alex factor is 6.85 %
Pair production rate
out of Al converter
(by varying width we can vary the yield)
through 1 m of air
plot and check this number
Appendix
pair production cross sections in an Al target
Ref. Geant4 and Theoretical Pair Production Cross Sections for 1 MeV - 100 GeV photons in Aluminum. Vakho Makarashvili, December 18, 2007
pair production cross sections in N
Ref. Photon Cross Section, Attenuation Coefficients, and Energy Absorption Coefficients From 10 keV to 100 Gev. J.H.Hubbell. Center for Radiation Research.National Bureau of Standards. Washington, D.C. 20234