QED cascade initiation via reflection of a multipetawatt laser pulse from a self-organized parabolic plasma mirror
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arXiv
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| Format: | Preprint |
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2025
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| author | Serebryakov, M. A. Nerush, E. N. Ji, L. Geng, X. Kostyukov, I. Yu. |
| author_facet | Serebryakov, M. A. Nerush, E. N. Ji, L. Geng, X. Kostyukov, I. Yu. |
| contents | The self-sustained or avalanche-type cascade is an intriguing prediction of strong-field quantum electrodynamics (QED) that has yet to be observed in laboratories. It is accompanied by the conversion of electromagnetic energy into gamma photons and electron-positron ($e^-e^+$) pairs, whose number increases exponentially over time. We investigate a simple configuration to initiate a QED cascades: it is based on the superposition of an incident multipetawatt laser pulse and its reflection from a solid target. The incident laser pulse <<deforms>> the initially flat target surface, creating a parabolic mirror that focuses the reflected radiation. For the considered setup the threshold laser power is about $7\,\text{PW}$. With a $27\,\text{PW}$ laser pulse, positron production exhibits clear signatures of an avalanche-type cascade, including exponential growth and more than 15 positron generations with similar energy spectra. Therefore, observing an avalanche-type QED cascade does not require the use of multiple laser channels with precise spatio-temporal synchronization, as previously supposed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15984 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | QED cascade initiation via reflection of a multipetawatt laser pulse from a self-organized parabolic plasma mirror Serebryakov, M. A. Nerush, E. N. Ji, L. Geng, X. Kostyukov, I. Yu. Plasma Physics Computational Physics The self-sustained or avalanche-type cascade is an intriguing prediction of strong-field quantum electrodynamics (QED) that has yet to be observed in laboratories. It is accompanied by the conversion of electromagnetic energy into gamma photons and electron-positron ($e^-e^+$) pairs, whose number increases exponentially over time. We investigate a simple configuration to initiate a QED cascades: it is based on the superposition of an incident multipetawatt laser pulse and its reflection from a solid target. The incident laser pulse <<deforms>> the initially flat target surface, creating a parabolic mirror that focuses the reflected radiation. For the considered setup the threshold laser power is about $7\,\text{PW}$. With a $27\,\text{PW}$ laser pulse, positron production exhibits clear signatures of an avalanche-type cascade, including exponential growth and more than 15 positron generations with similar energy spectra. Therefore, observing an avalanche-type QED cascade does not require the use of multiple laser channels with precise spatio-temporal synchronization, as previously supposed. |
| title | QED cascade initiation via reflection of a multipetawatt laser pulse from a self-organized parabolic plasma mirror |
| topic | Plasma Physics Computational Physics |
| url | https://arxiv.org/abs/2508.15984 |