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EMPIRE Simulations of the July 2020 photoelectron driven cavity B-Dot experiments at the National Ignition Facility

Christenson, Peggy J.; Flanagan, Timothy M.; Cartwright, Keith C.

Simulations of several of the end-irradiated cylindrical photoelectron driven cavity experiments (also known as B-Dot cavities) that were fielded during the July 1 through 2, 2020 shot series at the National Ignition Facility are presented in this report with comparisons to experimental measurements. All cavity B-Dots fielded on the second, third, fourth, fifth and seventh shots were simulated using coupled Integrated Tiger Series (ITS) Monte Carlo transport codes and the Electromagnetic Plasmas in Realistic Environments (EMPIRE) electromagnetic particle-in-cell code.

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TYPE SAND Report YEAR 2021
DOIOSTI

Simulation of a relativistic magnetron using a fluid electron model

IEEE International Conference on Plasma Science

Roberds, Nicholas R.; Sandoval, Andrew J.; Cartwright, Keith C.; Beckwith, Kristian B.

We present a novel technique for numerically modeling relativistic magnetrons. The electrons are represented with a 5-moment relativistic fluid. Typically, the particle in cell method is used for simulated relativistic high-power microwave sources. This study considers the A6 magnetron presented by Palevsky and Bekefi [1].

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TYPE Conference Presenation YEAR 2021
DOIOSTIScopus

Characterization of the Redesigned Extended MITL for HERMES III

Powell, Troy C.; Cartwright, Keith C.; Biller, Andrew C.; Pointon, Timothy D.

Modeling and simulation of the legacy HERMES III Magnetically Insulated Transmission Line (MITL) has been performed using EMPHASIS, an unstructured time-domain electromagnetic (UTDEM) particle-in-cell (PIC) simulation software. This design when used lost roughly half of its current before the pulse reached the load. The cause of the current loss in the MITL was found to be the vacuum impedance changes along the MITL. The MITL was then redesigned to maintain constant impedance and simulated in EMPHASIS once again. Following predicting simulation results, the new MITL was then built, installed, and tested, showing minimal current loss and good agreement with simulation and theoretical results, all of which are reported here. Additionally, an analysis of experimental voltage calculation techniques using cathode and anode currents is performed and compared to simulation results.

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TYPE SAND Report YEAR 2021
DOIOSTI
Results 26–50 of 106
Results 26–50 of 106