부산대학교 도서관

Quick note on how to run EGS4 to calculate the energy deposition in a material due to irradiation from choice of electrons, positrons, or photons. Presently have two EGS4 user codes set up to calculate energy deposition. The first was set up by Ralph Nelson for my initial exposure to EGS4. This code assumes an incident monoenergetic pencil (i.e. no transverse size) beam of electrons, photons, or positrons (IQin = -1,0,1 respectively). Initial beam energy (EKEin) and number of incident particles (Ncases) are specified by the user. The target geometry consists of (in this case) 10 concentric cylinders that have been cut longitudinally into 8 slices. A second user code looks for a user specified incident, gaussian rms beam size (SIGX and SIGY in cm) and EKEin is now the first harmonic, energy cutoff (E{sub c10}) in MeV for a K{sub u} = 1 undulator spectrum. EGS4 uses SIGX/Y and E{sub c10} to generate the initial beam position and incident energy of the individual photons. In addition, the user must provide a pair of data input files to define the cumulative undulator photon spectrum. The target geometry is the same as in the monoenergetic photon case. By way of example, these codes are used to model the energy deposition in 0.4 r.l. Ti due to photons produced by the Tesla TRD undulator driven by the 250 GeV Tesla primary electron beam.