Academic Journal
Anomalous hot electron generation from two-plasmon decay instability driven by broadband laser pulses with intensity modulations
| العنوان: | Anomalous hot electron generation from two-plasmon decay instability driven by broadband laser pulses with intensity modulations |
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| المؤلفون: | C. Yao, J. Li, L. Hao, R. Yan, C. Wang, A. Lei, Y-K. Ding, J. Zheng |
| المصدر: | Nuclear Fusion, Vol 64, Iss 10, p 106013 (2024) |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2024 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | two-plasmon decay, hot electrons, broadband laser, intensity modulation, laser plasma instability, inertial confinement fusion, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798 |
| الوصف: | We investigate the hot electrons generated from two-plasmon decay (TPD) instability driven by laser pulses with intensity modulated by a frequency Δ ω _m using theoretical and numerical approaches. Our primary focus lies on scenarios where Δ ω _m is on the same order of the TPD growth rate γ _0 ( $\Delta \omega_m \sim \gamma_0$ ), corresponding to moderate laser frequency bandwidths for TPD mitigation. With Δ ω _m conveniently modeled by a basic two-color scheme of the laser wave fields in fully-kinetic particle-in-cell simulations, we demonstrate that the energies of TPD modes and hot electrons exhibit intermittent evolution at the frequency Δ ω _m , particularly when $\Delta \omega_m \sim \gamma_0$ . With the dynamic TPD behavior, the overall ratio of hot electron energy to the incident laser energy, $f_\mathrm{hot}$ , changes significantly with Δ ω _m . While $f_\mathrm{hot}$ drops notably with increasing Δ ω _m at large Δ ω _m limit as expected, it goes anomalously beyond the hot electron energy ratio for a single-frequency incident laser pulse with the same average intensity when Δ ω _m falls below a specific threshold frequency Δ ω _c . This anomaly arises from the pronounced sensitivity of $f_\mathrm{hot}$ to variations in laser intensity. We find this threshold frequency Δ ω _c primarily depends on γ _0 and the collisional damping rate of plasma waves, with relatively lower sensitivity to the density scale length. We develop a scaling model characterizing the relation of Δ ω _c and laser plasma conditions, enabling the potential extention of our findings to more complex and realistic scenarios. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | https://doi.org/10.1088/1741-4326/ad6c62; https://doaj.org/toc/0029-5515; https://doaj.org/article/d9215c26dc8341fa8159c26b452ba959 |
| DOI: | 10.1088/1741-4326/ad6c62 |
| الاتاحة: | https://doi.org/10.1088/1741-4326/ad6c62 https://doaj.org/article/d9215c26dc8341fa8159c26b452ba959 |
| رقم الانضمام: | edsbas.F3B11E8 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/1741-4326/ad6c62 |
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