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The VORPAL software, traditionally used to model plasma and EM problems on large scale supercomputers, has been upgraded to treat thermal conduction as well. This allows us to solve integrated thermal & EM problems, for vacuum electronics, where the heat source is either ohmic wall heating, or charged particle impact.
Summary form only given. Researchers often would like to apply Particle-in-Cell (PIC) methods to model cold, high pressure plasmas in order to discern any kinetic, nonlinear or space charge effects. However, the PIC method typically does not perform well at low temperatures and high densities due to limitations on time and space scales for numerical and practical reasons. One of these limitations...
Preserving Gauss's law during particle emission in electromagnetic codes is key for obtaining proper solutions in high emission current electromagnetic simulations. Tech-X's electromagnetic PIC code VORPAL has recently been extended to cut cell geometries with arbitrary emission regions defined for a variety of emitters including (among others) thermal-field emitters and secondary emission. In this...
Recent advances to the electromagnetic solvers in the VORPAL FDTD-PIC simulation software have allowed us to maintain a finite-difference solution technique, while modeling conducting and dielectric boundary surfaces that cut through the grid at arbitrary angle, thus providing precise modeling of the electromagnetic volume. However, a remaining challenge is how to emit particles from these surfaces...
Summary form only given. Recent advances and implementations of new "cut-cell" algorithms now permits very accurate 2nd-order geometry representation in modeling tools which have the required self-consistent treatment of space-charge and mode fields, necessary for design of the high-space-charge beam-to-RF conversion subcomponents. This development significantly reduces design and modeling...
The physics interest in a luminosity upgrade of RHIC requires the development of a cooling-frontier facility. Detailed calculations were made of electron cooling of the stored RHIC beams. This has been followed by beam dynamics simulations to establish the feasibility of creating the necessary electron beam. The electron beam accelerator will be a superconducting Energy Recovery Linac (ERL). An intensive...
Summary form only given. The PML (perfectly matched layer) boundary condition of Berenger, is implemented in the MAGIC finite-difference particle-in-cell software, and its behavior is verified and studied. This boundary condition provides a matched electric/magnetic absorber, in a tapered profile, similar to the software's existing "free-space" boundary condition, with the added promise...
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