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MICHELLE's computational demands have increased at least tenfold through its development and evolutionary years. For instance, the Naval Research Laboratory's (NRL) needs for designing and developing millimeter and sub-millimeter VE devices necessitate a substantial speed-up in order to ensure the ability to use the MICHELLE code for design optimization, inverse problems, and sensitivity/tolerance...
The design cycle of RF devices is greatly facilitated by the use of the “virtual prototyping” methodology based on high-fidelity computer simulations that are capable of predicting the RF device's performance in response to changes in its physical parameters. In particular, critical dimensions of the structure, or quantitative properties of the various electromagnetic components are routinely utilized...
The next generation of the MICHELLE ES PIC code is to improve its parallelization and leverages a number of existing and emerging DOD HPC architectures and software including distributed memory clusters, multicore, and computational accelerators such as GPUs and Intel Xeon Phi co-processors. The ongoing project supported by the DOD HASI program also aims to build interfaces between MICHELLE and existing...
We present an integrated environment for large scale multi-parameter design optimization of RF devices based on AFRL's Galaxy Simulation Builder productivity tool for distributed high-performance computing, Sandia National Lab's DAKOTA optimization library, and a suite of highly efficient GPU-based Electromagnetic codes developed at NRL in collaboration with Leidos, Inc. The environment allows for...
ObjectiveNatural resource policy has been a constant source of conflict between “Aboriginal” and “non‐Aboriginal” stakeholders in Canada. We employ a historical institutionalist analysis to examine the extent to which changes to the Canadian Constitution in 1982 and Ontario's Mining Act in 2009 enabled Aboriginal communities to become equal partners in participatory governance arrangements in mineral...
New models have been developed and implemented in the MICHELLE Finite-Element Electrostatic Particle-in-Cell code1 in support of modeling RF photocathodes and IOTs (inductive output tubes). In the case of photocatodes, low emittance, high current density sources are required to achieve the small beam size needed for high frequency vacuum electronic devices and, in particular, low emittance sources...
There is a significant level of effort by SAIC and BWR, funded by ONR & JTO, to enhance the three dimensional (3D) finite-element (FE) electrostatic timedomain (ESTD) particle-in-cell (PIC) code MICHELLE to provide modeling and simulation of the interaction of electron emission sources in the presence of electromagnetic cavity fields. These enhancements have direct importance to the free-electron...
The MICHELLE [1], [2] two-dimensional (2D) and three-dimensional (3D) steady-state and time-domain particle-in-cell (PIC) code has been employed successfully by industry, national laboratories, and academia and has been used to design and analyze a wide variety of devices, including RF photoemitters, RF gated emitters, multistage depressed collectors, gridded guns, multibeam guns, annular-beam guns,...
The MICHELLE code is a Finite-Element Electrostatic Particle in Cell code for application to 2D and 3D particle beam formation, transport, and collection. Although its initial development focus had been for DC electron guns and depressed collectors, other applications such as RF electron guns, ion thrusters, photocathodes, etc. have become a recent focus. The MICHELLE code's ability to manage large...
The MICHELLE code is a Finite-Element Electrostatic Particle in Cell code for application to 2D and 3D particle beam formation, transport, and collection. Although its initial development focus had been for DC electron guns and depressed collectors, other applications such as RF electron guns, ion thrusters, photocathodes, etc. have become a recent focus. The MICHELLE code's ability to manage large...
The MICHELLE code is a Finite-Element Electrostatic Particle in Cell code for application to 2D and 3D particle beam formation, transport, and collection. Although its initial development focus had been for DC electron guns and depressed collectors, other applications such as RF electron guns, ion thrusters, photocathodes and e-beam lithography have become a recent focus. The MICHELLE code's ability...
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