Orbital angular momentum enhanced laser absorption and neutron generation
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914803808731136 |
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| author | Peskosky, Nicholas Ernst, Nicholas Burger, Miloš Murphy, Jon Nees, John A. Jovanovic, Igor Thomas, Alec G. R. Krushelnick, Karl |
| author_facet | Peskosky, Nicholas Ernst, Nicholas Burger, Miloš Murphy, Jon Nees, John A. Jovanovic, Igor Thomas, Alec G. R. Krushelnick, Karl |
| contents | We experimentally demonstrate enhanced absorption of near relativistic optical vortex beams in $\mathrm{D_2O}$ plasmas to generate a record fast-neutron yield of $1.45 \times 10^6$ n/s/sr. Beams with a topological charge of 5 were shown to deliver up to a 3.3 times enhancement of fast-neutron yield over a Gaussian focused beam of the same energy but having two orders of magnitude higher intensity. This result was achieved with laser energies of 16 mJ and a pulse duration of 67 fs. The Orbital Angular Momentum (OAM) beam-target interactions in our experiment were also investigated through Particle-in-Cell (PIC) simulations. Electron density rippling resulting in enhanced plasma wave excitation on the critical surface and significantly enhanced resonance absorption is observed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_12330 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Orbital angular momentum enhanced laser absorption and neutron generation Peskosky, Nicholas Ernst, Nicholas Burger, Miloš Murphy, Jon Nees, John A. Jovanovic, Igor Thomas, Alec G. R. Krushelnick, Karl Plasma Physics We experimentally demonstrate enhanced absorption of near relativistic optical vortex beams in $\mathrm{D_2O}$ plasmas to generate a record fast-neutron yield of $1.45 \times 10^6$ n/s/sr. Beams with a topological charge of 5 were shown to deliver up to a 3.3 times enhancement of fast-neutron yield over a Gaussian focused beam of the same energy but having two orders of magnitude higher intensity. This result was achieved with laser energies of 16 mJ and a pulse duration of 67 fs. The Orbital Angular Momentum (OAM) beam-target interactions in our experiment were also investigated through Particle-in-Cell (PIC) simulations. Electron density rippling resulting in enhanced plasma wave excitation on the critical surface and significantly enhanced resonance absorption is observed. |
| title | Orbital angular momentum enhanced laser absorption and neutron generation |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2405.12330 |