A non-electroneutral model for complex reaction-diffusion systems incorporating species interactions

In this study we develop a general framework for describing reaction-diffusion processes in a multi-component electrolyte in which multiple reactions of different types may occur. Our motivation for this is the need to understand how the interactions between species and processes occurring in a complex electrochemical system. We use the framework to develop a modified Poisson-Nernst-Planck model which accounts for the excluded volume interaction (EVI) and incorporates both electrochemical and chemical reactions. Using this model, we investigate how the EVI influences the reactions and how the reactions influence each other in the contexts of the equilibrium state of a system and of a simple electrochemical device under load. Complex behaviour quickly emerges even in relatively simple systems, and deviations from the predictions of ideal solution theory, together with how they may influence the behaviour of more complex system, are discussed

THE SVX-II SILICON VERTEX DETECTOR UPGRADE AT CDF

The SVX vertex detector has been very successful in heavy flavor physics at CDF, playing a significant role in both top and bottom analyses. SVX', a radiation hard version of SVX, is presently taking data. In 1998 the Main Injector upgrade to the accelerator complex at Fermilab will provide a significant increase in luminosity, and will require a new vertex detector, SVX II. The specifications and design considerations for this detector are discussed