Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

Medientyp: E-Artikel
Titel: Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field
Beteiligte: Filippov, Evgeny D.; Makarov, Sergey S.; Burdonov, Konstantin F.; Yao, Weipeng; Revet, Guilhem; Béard, Jerome; Bolaños, Simon; Chen, Sophia N.; Guediche, Amira; Hare, Jack; Romanovsky, Denis; Skobelev, Igor Yu.; Starodubtsev, Mikhail; Ciardi, Andrea; Pikuz, Sergey A.; Fuchs, Julien
Erschienen: Springer Science and Business Media LLC, 2021
Erschienen in: Scientific Reports
Sprache: Englisch
DOI: 10.1038/s41598-021-87651-8
ISSN: 2045-2322
Schlagwörter: Multidisciplinary
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Beschreibung: <jats:title>Abstract</jats:title><jats:p>We analyze, using experiments and 3D MHD numerical simulations, the dynamic and radiative properties of a plasma ablated by a laser (1 ns, 10<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{12}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>12</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>–10<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{13}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>13</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> W/cm<jats:inline-formula><jats:alternatives><jats:tex-math>$$^2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>2</mml:mn> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula>) from a solid target as it expands into a homogeneous, strong magnetic field (up to 30 T) that is transverse to its main expansion axis. We find that as early as 2 ns after the start of the expansion, the plasma becomes constrained by the magnetic field. As the magnetic field strength is increased, more plasma is confined close to the target and is heated by magnetic compression. We also observe that after <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sim 8$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>∼</mml:mo> <mml:mn>8</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> ns, the plasma is being overall shaped in a slab, with the plasma being compressed perpendicularly to the magnetic field, and being extended along the magnetic field direction. This dense slab rapidly expands into vacuum; however, it contains only <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sim 2\%$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>∼</mml:mo> <mml:mn>2</mml:mn> <mml:mo>%</mml:mo> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> of the total plasma. As a result of the higher density and increased heating of the plasma confined against the laser-irradiated solid target, there is a net enhancement of the total X-ray emissivity induced by the magnetization.</jats:p>
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