# Direct observation of imploded core heating via fast electrons with super-penetration scheme

Article · Tao Gong, H. Habara, K. Sumioka, M. Yoshimoto, Y. Hayashi, S. Kawazu, T. Otsuki, Toshikazu Matsumoto, Takumi Minami, K. Abe, K. Aizawa, Yuya Enmei, Yasuhiko Fujita, A. Ikegami, Hiroki Makiyama, K. Okazaki, Keiji Okida, T. Tsukamoto, Yasunobu Arikawa, Shinsuke Fujioka, Y. Iwasa, Seungho Lee, Hideo Nagatomo, H. Shiraga, Kohei Yamanoi and 2 more

- Archive id: doi:10.1038/s41467-019-13574-8
- Published: 2019-12-09
- Venue: Nature Communications
- DOI: https://doi.org/10.1038/s41467-019-13574-8
- PMID: 31819056
- Citations: 199
- Source URL: https://doi.org/10.1038/s41467-019-13574-8
- PDF: https://www.nature.com/articles/s41467-019-13574-8.pdf
- Provenance: openalex

## Abstract

Fast ignition (FI) is a promising approach for high-energy-gain inertial confinement fusion in the laboratory. To achieve ignition, the energy of a short-pulse laser is required to be delivered efficiently to the pre-compressed fuel core via a high-energy electron beam. Therefore, understanding the transport and energy deposition of this electron beam inside the pre-compressed core is the key for FI. Here we report on the direct observation of the electron beam transport and deposition in a compressed core through the stimulated Cu Kα emission in the super-penetration scheme. Simulations reproducing the experimental measurements indicate that, at the time of peak compression, about 1% of the short-pulse energy is coupled to a relatively low-density core with a radius of 70 μm. Analysis with the support of 2D particle-in-cell simulations uncovers the key factors improving this coupling efficiency. Our findings are of critical importance for optimizing FI experiments in a super-penetration scheme.

_Abstract reproduced under CC-BY (publisher license, via OpenAlex)._

Topics: [Inertial Confinement Fusion](https://space-kitty.com/topics/inertial-fusion)

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