Zobrazeno 1 - 10
of 3 616
pro vyhledávání: '"P Merlini"'
We propose here a novel stabilization strategy for the PMCHWT equation that cures its frequency and conductivity related instabilities and is obtained by leveraging quasi-Helmholtz projectors. The resulting formulation is well-conditioned in the enti
Externí odkaz:
http://arxiv.org/abs/2408.01321
In this contribution we analyze the spectral properties of some commonly used boundary integral operators in computational electromagnetics and of their discrete counterparts, highlighting peculiar features of their spectra. In particular, a comparis
Externí odkaz:
http://arxiv.org/abs/2407.09116
Surface integral equations (SIEs)-based boundary element methods are widely used for analyzing electromagnetic scattering scenarii. However, after discretization of SIEs, the spectrum and eigenvectors of the boundary element matrices are not usually
Externí odkaz:
http://arxiv.org/abs/2405.11167
Autor:
Valenzuela-Villaseca, V., Suttle, L. G., Suzuki-Vidal, F., Halliday, J. W. D., Russell, D. R., Merlini, S., Tubman, E. R., Hare, J. D., Chittenden, J. P., Koepke, M. E., Blackman, E. G., Lebedev, S. V.
We present a detailed characterization of the structure and evolution of differentially rotating plasmas driven on the MAGPIE pulsed-power generator (1.4 MA peak current, 240 ns rise-time). The experiments were designed to simulate physics relevant t
Externí odkaz:
http://arxiv.org/abs/2403.20321
Autor:
Valenzuela-Villaseca, V., Suttle, L. G., Suzuki-Vidal, F., Halliday, J. W. D., Russell, D. R., Merlini, S., Tubman, E. R., Hare, J. D., Chittenden, J. P., Koepke, M. E., Blackman, E. G., Lebedev, S. V.
Recent pulsed-power experiments have demonstrated the formation of astrophysically-relevant, differentially rotating plasmas [1]. Key features of the plasma flows are the discovery of a quasi-Keplerian rotation curve, the launching of highly-collimat
Externí odkaz:
http://arxiv.org/abs/2312.02346
Autor:
Giunzioni, Viviana, Ciacco, Giuseppe, Henry, Clément, Merlini, Adrien, Andriulli, Francesco P.
This work presents a fast direct solver strategy allowing full-wave modeling and dosimetry at terahertz (THz) frequencies. The novel scheme leverages a preconditioned combined field integral equation together with a regularizer for its elliptic spect
Externí odkaz:
http://arxiv.org/abs/2310.15644
Publikováno v:
ACS Omega, Vol 9, Iss 46, Pp 46104-46116 (2024)
Externí odkaz:
https://doaj.org/article/5f23b030174b458eab97847b96b6c278
The accuracy of the electric field integral equation (EFIE) can be substantially improved using high-order discretizations. However, this equation suffers from ill-conditioning and deleterious numerical effects in the low-frequency regime, often jeop
Externí odkaz:
http://arxiv.org/abs/2308.15331
Autor:
Masciocchi, Matteo E., Citraro, Ermanno, Dély, Alexandre, Rahmouni, Lyes, Merlini, Adrien, Andriulli, Francesco P.
Recent contributions showed the benefits of operator filtering for both preconditioning and fast solution strategies. While previous contributions leveraged laplacian-based filters, in this work we introduce and study a different approach leveraging
Externí odkaz:
http://arxiv.org/abs/2307.09276
Autor:
Merlini, S., Hare, J. D., Burdiak, G. C., Halliday, J. W. D., Ciardi, A., Chittenden, J. P., Clayson, T., Crilly, A. J., Eardley, S. J., Marrow, K. E., Russell, D. R., Smith, R. A., Stuart, N., Suttle, L. G., Tubman, E. R., Valenzuela-Villaseca, V., Varnish, T. W. O., Lebedev, S. V.
Publikováno v:
Phys. Plasmas 30, 092102 (2023)
We study the structure of reverse shocks formed by the collision of supersonic, magnetised plasma flows driven by an inverse (or exploding) wire array with a planar conducting obstacle. We observe that the structure of these reverse shocks varies dra
Externí odkaz:
http://arxiv.org/abs/2306.01847