DEVS representation of dynamical systems: event-based intelligent control

Article Abstract:

The increasing power and performance of computers made discrete event simulations possible, but programming was paramount for doing such simulations. Computer-independent model description formalisms can greatly enhance analysis of complex systems. Discrete Event System Specification (DEVS) models allow event-based logic control to be designed, in which the controller expects to receive confirming sensor responses to control commands it sends within definite time windows determined by its DEVS model of the system being controlled. The DEVS formalism serves the same purpose in event-based control that differential and difference equation formalisms serve in conventional control. The event-based control paradigm is applied in advanced robotic and intelligent automation to show how classical process control can be integrated with rule-based symbolic reasoning systems.

Systems analysis, Process control, Control systems, System Design, Mathematics of Computing, Discrete Simulation, Rule-Based System, Models of Computation, technical, Event-Driven Systems

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Stimulations of ion dynamics in induction Linacs with advanced gap circuit models

Article Abstract:

Longitudinal dynamics is a crucial problem in ion accelerators such as those being developed for heavy ion fusion (HIF). For example, microscopic bunching instability that increases the beam energy spread is a concern. Computer simulations of a coasting beam in a periodic multigap accelerator are described. The simulations indicate that shunt capacitance can stabilize microscopic bunching instabilities. Bunching instabilities can also be stabilized by introducing a coherent energy shift between the beams of a multiple-beam HIF transport system. The simulations indicate that this approach is successful, provided there is an adequate overlap between the beams in velocity space.

Technology, Technical, Power supplies (Computers), Simulation, Power Supply, Particle Physics

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