MODELING OF COHERENT SYNCHROTRON RADIATION USING A DIRECT NUMERICAL SOLUTION OF MAXWELL'S EQUATIONS*
We present and discuss the properties of coherent electromagnetic fields of a very short, ultra-relativistic bunch, which travels in a rectangular vacuum chamber under the influence of a bending force of a magnet. The analysis is based on the results of a direct numerical solution of Maxwell's equations together with Newton's equations. We use a new dispersion-free time-domain algorithm which employs a more efficient use of finite element mesh techniques and hence produces self- consistent and stable solutions for very short bunches. We investigate the fine structure of the CSR fields. We also discuss coherent edge radiation. We present a clear picture of the field using the electric field lines constructed from the numerical solutions. This approach should be useful in the study of existing and future concepts of particle accelerators and ultrafast coherent light sources, where high peak currents and very short bunches are envisioned.
Abstract Systematization of an energy saving grass-root design and retrofitting technology based on process integration is a subject of increasing interest in plants running under the batch mode of operation. In this work, the solution to the product changeover problem is studied in order to achieve a feasible and optimized heat exchance network design for multiproduct batch plants. A new methodology is presented which is based on: (a) the campaign-mode of plant operation; and (b) the study of energy integration for each campaign. The concept of Macronetwork is also introduced. This includes the heat exchanger network of all campaigns in an overall design, and contemplates the common matches between networks of campaigns of different products. Algorithms to obtain the best feasible matches and energy targets are presented and results of test-case studies are discussed to illustrate this methodology.