Enhanced Hot Electron Preheat Observed in Magnetized Laser Direct-Drive Implosions
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915806067032064 |
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| author | Cufari, M. Johnson, M. Gatu Li, C. K. Frenje, J. A. Moloney, P. W. Crilly, A. J. Heuer, P. V. Davies, J. R. |
| author_facet | Cufari, M. Johnson, M. Gatu Li, C. K. Frenje, J. A. Moloney, P. W. Crilly, A. J. Heuer, P. V. Davies, J. R. |
| contents | Hard x-ray emission, associated with hot electron preheat, in direct-drive implosions was observed to be enhanced by a factor of $1.5\pm0.1$ by application of a $10$ T magnetic field. The applied magnetic field reaches a quasi steady-state aligned with the ablation flow prior to the onset of laser-plasma instabilities in the corona. Hot electrons that would otherwise escape the corona and lead to capsule charging in unmagnetized implosions are confined in a mirror-mode of the magnetic field in magnetized implosions. These hot electrons are shown to subsequently pitch-angle scatter from the mirror onto the capsule, thereby leading to the observed hard x-ray generation in magnetized implosions. Consequently, the energy of charged-fusion products, associated with the capsule charging, are observed to decrease when the implosion is magnetized. These results intensify the need to mitigate laser-plasma instabilities -- particularly for magnetized implosions -- to maximize fusion gain and implosion efficiency. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_16884 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Enhanced Hot Electron Preheat Observed in Magnetized Laser Direct-Drive Implosions Cufari, M. Johnson, M. Gatu Li, C. K. Frenje, J. A. Moloney, P. W. Crilly, A. J. Heuer, P. V. Davies, J. R. Plasma Physics Hard x-ray emission, associated with hot electron preheat, in direct-drive implosions was observed to be enhanced by a factor of $1.5\pm0.1$ by application of a $10$ T magnetic field. The applied magnetic field reaches a quasi steady-state aligned with the ablation flow prior to the onset of laser-plasma instabilities in the corona. Hot electrons that would otherwise escape the corona and lead to capsule charging in unmagnetized implosions are confined in a mirror-mode of the magnetic field in magnetized implosions. These hot electrons are shown to subsequently pitch-angle scatter from the mirror onto the capsule, thereby leading to the observed hard x-ray generation in magnetized implosions. Consequently, the energy of charged-fusion products, associated with the capsule charging, are observed to decrease when the implosion is magnetized. These results intensify the need to mitigate laser-plasma instabilities -- particularly for magnetized implosions -- to maximize fusion gain and implosion efficiency. |
| title | Enhanced Hot Electron Preheat Observed in Magnetized Laser Direct-Drive Implosions |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2602.16884 |