Laser-cluster interaction in an external magnetic field: the effect of laser polarization
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| Format: | Preprint |
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2024
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| _version_ | 1866929357440679936 |
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| author | Swain, Kalyani Kundu, Mrityunjay |
| author_facet | Swain, Kalyani Kundu, Mrityunjay |
| contents | Collisionless absorption of laser energy by an electron via laser-cluster interaction in an ambient magnetic field ($B_0$) has recently renewed interest. %due to high levels of absorption. Previously, using a rigid sphere model (RSM) and an extensive particle-in-cell (PIC) simulation with linearly polarized (LP) laser light, we have shown that an auxiliary field $B_0$ in a transverse direction to the laser polarization significantly enhances the laser absorption [Scientific Reports {\bf 12}, 11256 (2022)]. In this LP case, the average energy ($\mathcal{E}_A$) of an electron rises near $30-70$ times of its ponderomotive energy ($U_p$). The two-stage laser absorption by cluster electrons has been attributed via anharmonic resonance (AHR) followed by electron-cyclotron resonance (ECR) satisfying the improved phase-matching and frequency-matching conditions simultaneously. %Again, we report the narrow cone-like propagation of these %energetic electron bunches as a weakly relativistic electron beam with an %angular spread $Δθ<5^{\circ}$. %Also, we highlight the effect of bigger cluster sizes on the energy and %angular spread of these electrons. In the present work, we study the effect of circularly polarized (CP) laser fields on the cluster-electron dynamics considering left/right circular polarizations with an ambient $B_0$. %, energy distribution, and.. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_15323 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Laser-cluster interaction in an external magnetic field: the effect of laser polarization Swain, Kalyani Kundu, Mrityunjay Plasma Physics Collisionless absorption of laser energy by an electron via laser-cluster interaction in an ambient magnetic field ($B_0$) has recently renewed interest. %due to high levels of absorption. Previously, using a rigid sphere model (RSM) and an extensive particle-in-cell (PIC) simulation with linearly polarized (LP) laser light, we have shown that an auxiliary field $B_0$ in a transverse direction to the laser polarization significantly enhances the laser absorption [Scientific Reports {\bf 12}, 11256 (2022)]. In this LP case, the average energy ($\mathcal{E}_A$) of an electron rises near $30-70$ times of its ponderomotive energy ($U_p$). The two-stage laser absorption by cluster electrons has been attributed via anharmonic resonance (AHR) followed by electron-cyclotron resonance (ECR) satisfying the improved phase-matching and frequency-matching conditions simultaneously. %Again, we report the narrow cone-like propagation of these %energetic electron bunches as a weakly relativistic electron beam with an %angular spread $Δθ<5^{\circ}$. %Also, we highlight the effect of bigger cluster sizes on the energy and %angular spread of these electrons. In the present work, we study the effect of circularly polarized (CP) laser fields on the cluster-electron dynamics considering left/right circular polarizations with an ambient $B_0$. %, energy distribution, and.. |
| title | Laser-cluster interaction in an external magnetic field: the effect of laser polarization |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2405.15323 |