On the condensed history technique for electron transport

I In this repork we discuss the theory of the "candens& brstory tduique", an approximate mlutioa to the Boltzmam traaqmrt equation that sums tbe dect of up to thousands of d k c t e , small momturn transfer elastic and inch& collisions into single hgert&ct quasitvtnb. Tbis technique saves much ealcdationa1 effort at the expense of introducing errors that arc now understood quantitatirey in terms of the development p-td htreio. We apply ow -1ysb to m d m realizations of the condemed history method, namely those of EGSIPRESTA, ElXAWITC, FLUKA, PENELOPE, and LLCA. We haw also constructed an algorithm that exhibits smaIIer Iarge step size instabdities than all of these methds and give s e v d examples. O 1998 National Research C o d of Canada, Published by E k v k science B.V.