Collimation of diamagnetic laser-driven plasma outflows by an ambient magnetic-pressure gradient
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Tian, Yigeng Leung, Chung Hei Bose, Arijit Bandyopadhyay, Riddhi Shay, Michael A. Matthaeus, William H. |
| author_facet | Tian, Yigeng Leung, Chung Hei Bose, Arijit Bandyopadhyay, Riddhi Shay, Michael A. Matthaeus, William H. |
| contents | We present magnetohydrodynamic simulations of laser driven plasma outflows propagating along an externally applied poloidal magnetic field, designed to mimic coronal open-field plasma jets. Using the FLASH code with non-ideal terms (resistivity, Biermann battery, and Nernst advection) included, we model a CH target driven by a 3$ω$ (351 nm) beam delivering 5 kJ over 10 ns and a uniform background field $\text{B}_0$ = 0 to 50 T. Under these conditions, the expanding plume develops a central low-density diamagnetic cavity bounded by a high-magnetic-pressure shell. Magnetic flux is advected from the plume center to its edge, and azimuthal diamagnetic currents form that decrease fields inside the cavity and amplify fields outside, producing a radial magnetic-pressure gradient that exerts an inward $\text{J}\times \text{B}$ force and radially confines the flow. We show that the collimation strengthens with increasing applied magnetic field, as stronger fields reduce the plasma $β$ and correspondingly enhance the confining $\text{J}\times \text{B}$ force. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02704 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Collimation of diamagnetic laser-driven plasma outflows by an ambient magnetic-pressure gradient Tian, Yigeng Leung, Chung Hei Bose, Arijit Bandyopadhyay, Riddhi Shay, Michael A. Matthaeus, William H. Plasma Physics We present magnetohydrodynamic simulations of laser driven plasma outflows propagating along an externally applied poloidal magnetic field, designed to mimic coronal open-field plasma jets. Using the FLASH code with non-ideal terms (resistivity, Biermann battery, and Nernst advection) included, we model a CH target driven by a 3$ω$ (351 nm) beam delivering 5 kJ over 10 ns and a uniform background field $\text{B}_0$ = 0 to 50 T. Under these conditions, the expanding plume develops a central low-density diamagnetic cavity bounded by a high-magnetic-pressure shell. Magnetic flux is advected from the plume center to its edge, and azimuthal diamagnetic currents form that decrease fields inside the cavity and amplify fields outside, producing a radial magnetic-pressure gradient that exerts an inward $\text{J}\times \text{B}$ force and radially confines the flow. We show that the collimation strengthens with increasing applied magnetic field, as stronger fields reduce the plasma $β$ and correspondingly enhance the confining $\text{J}\times \text{B}$ force. |
| title | Collimation of diamagnetic laser-driven plasma outflows by an ambient magnetic-pressure gradient |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2604.02704 |