Orbital angular momentum enhanced laser absorption and neutron generation
| Autor: | Peskosky, Nicholas, Ernst, Nicholas, Burger, Miloš, Murphy, Jon, Nees, John A., Jovanovic, Igor, Thomas, Alec G. R., Krushelnick, Karl |
|---|---|
| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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. Comment: 7 pages, 4 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|