zz (OLD) Casper Dev
Charging Models
Accurate modeling of grain charging under various astrophysical environments has long been a problem. In particular, when a dust particle is coupled to a plasma within a dusty plasma environment, grain charging becomes extremely complicated to determine. Researchers within the Center have developed a suite of programs designed to tackle this problem. Dynamic grain charging under a large variety of conditions while incorporating the interaction of the grains with the plasmas as either sources or sinks can now be tracked. Additionally, transient heating and electromagnetic events can also be examined using any one of several charging algorithms. All of the charging models employ a full calculation of individual grain capacitances while taking into account the properties of the individual grains as well as the dust and plasma parameters. This allows for dusty plasmas with varying size distributions to be examined. All charging programs are also able to track grain charging dynamically, enabling researchers to determine grain charging times during transient events. Since protoplanetary development studies, disk system development, ring system development, ring system dynamics, planetesimal resonance conditions, cometary dynamics along with a host of other interesting physical problems are all influenced by the charge on the grains within the system, the above numerical algorithms when linked to the Box_Tree code provide a powerful program suite for theoretical astrophysical research.