THE EGS5 CODE SYSTEM

List of Figures2.1 Program flow and data control in EGS5. . . . . . . . . . . . . . . . . . . . . . . . . . 322.2 Feynman diagrams for bremsstrahlung and pair production. . . . . . . . . . . . . . . 372.3 Feynman diagrams for two body interactions with electrons. . . . . . . . . . . . . . . 612.4 Definition of two-body scattering angles. . . . . . . . . . . . . . . . . . . . . . . . . . 612.5 Feynman diagram for single photon e + e − annihilation. . . . . . . . . . . . . . . . . . 732.6 Plots of Molière functions f (0) , f (1) , and f (2) . . . . . . . . . . . . . . . . . . . . . . . 882.7 Plot of Equation 2.290 (B − ln B = b). . . . . . . . . . . . . . . . . . . . . . . . . . 902.8 Schematic of electron transport mechanics model. . . . . . . . . . . . . . . . . . . . . 972.9 Random hinge transport mechanics schematic. . . . . . . . . . . . . . . . . . . . . . 982.10 Modified random hinge transport mechanics schematic. . . . . . . . . . . . . . . . . 1002.11 Dual (energy and angle) hinge transport mechanics schematic. . . . . . . . . . . . . 1022.12 Electron transport across region boundaries. . . . . . . . . . . . . . . . . . . . . . . . 1032.13 Translation steps and transport steps for energy loss hinges. . . . . . . . . . . . . . . 1052.14 Electron boundary crossing during translation steps. . . . . . . . . . . . . . . . . . . 1072.15 Schematic illustrating the “broomstick” problem. . . . . . . . . . . . . . . . . . . . . 1132.16 Schematic illustrating the modified “broomstick” problem as used in EGS5. . . . . . 114viii