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22nd International Vacuum Electronics Conference (IVEC)

作者： Chernyayskiy, Igor A. Naval Res Lab Elect Sci & Technol Div Washington DC 20375 USA

ISBN: (纸本)9781665441056

This work presents results of the study, which involves modifications in the algorithms of the well-known 2D large-signal klystron code TESLA with a goal to improve its performance by simplifications in the physics of its model. The proposed modifications are based on the idea to reduce number of degrees of freedom of particle's motion from 3 down to 1 by restricting their motion along Z-axis only. Essentially, this will assume that magnetic field is infinitely large and one can completely ignore radial motion of particles as they will be "frozen" and allowed move in one direction only. Such modification in effect will reduce dimensionality of the algorithm from 2D down to 1.5D as a price to pay for proposed simplifications in the model. We will discuss pilot results of modeling by using the modified, reduced order algorithm, making main emphasis on advantages and disadvantages ("gains and losses") of such step.

关键词： large-signal code degrees of freedom of motion reduced order algorithm performance of the code

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From 2.5-D to 1.5-D: Fast, Reduced-Order Simulations With the TESLA-Family of Large-Signal codes

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IEEE TRANSACTIONS ON ELECTRON DEVICES 2023年第10期70卷 5353-5358页

作者： Chernyavskiy, Igor A. Naval Res Lab Washington DC 20375 USA

This study presents the introduction of the reduced-order, 1.5-D versions of the TESLA-family of 2.5-D large-signal codes, which have been implemented by simplifications in the particle's motion model by its restriction in a single, z-direction only. This in effect assumes that the guiding magnetic field is infinite what leads to a complete elimination of any transverse motion of particles, including their radial motion and rotation. Such simplifications in the algorithms allow reach up to two-times improvement in their performance due to significantly reduced number of operations, but they also in effect reduce an overall dimensionality of the algorithms from 2.5-D to 1.5-D only. The results of the modeling performed by the newly introduced 1.5-D versions of TESLA-family of large-signal codes and their comparisons with the results of modeling by the original 2.5-D algorithms are discussed in detail. Results of this study allow find accuracy and range of applicability of the 1.5-D large-signal codes and help to determine the place of such reduced-order algorithms.

关键词： Degrees of freedom of motion large-signal code performance of the code reduced-order algorithm

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