The saddest dropout stories surely are those students who reach their senior year and still can't make it to graduation. A picture of one high school's efforts to understand and reach them provides an example for all schools.

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MALL SCHOOLS today strike many educators and policy makers as a potential cure for what ails American schools. This enthusiasm for small schools needs historical perspective. The criticism of large schools as inhumane, inefficient, and unsafe seems so reasonable that one wonders how educators could ever have held other views. But they did. Until the 1970s, the small school was seen as the problem, not the solution. Before then, if large schools were questioned, it was only the behemoths-urban high schools with more than 3,000 students and elementary schools with more than 1,000-that were con

Index Terms-Boundary element method, moving window, parallelization, scattered fields, short-range wake field.

Accurate computations of wake potentials are an important task in modern accelerator design. Short bunches used in high energy particle accelerators excite very highfrequency fields. The geometrical size of accelerating structures exceeds the wavelength of the excited fields by many orders of magnitude. The application of codes such as TBCI, MAFIA[1] or tamBCI are limited due to numerical dispersion effects and memory needs. Recently new codes like PBCI have been developed to overcome these problems. In this work the utilization of dispersionless directions in the leapfrog update scheme on a Cartesian grid are proposed for accurate simulations. In conjunction with a conformal modeling technique which allows for the full Courant time step a moving window technique can be applied. This was previously implemented in a 2D code [2]. In this publication an extension to arbitrary three dimensional problems is presented.