1.Kansai Photon Science Institute, National Institutes for Quantum Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
2.The John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
3.Helmholtz-Zentrum DresdenRossendorf, 01328 Dresden, Germany
4.Technische Universität Dresden, 01069 Dresden, Germany
5.Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan
Karl Zeil (k.zeil@hzdr.de)
Mamiko Nishiuchi (nishiuchi.mamiko@qst.go.jp)
纸质出版日期:2023-4-30,
网络出版日期:2023-3-13,
收稿日期:2022-6-30,
修回日期:2023-1-16,
录用日期:2023-1-30
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Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities[J]. 光:科学与应用, 2023,12(4):593-604.
Dover, N. P.et al. Enhanced ion acceleration from transparencydriven foils demonstrated at two ultraintense laser facilities.Light: Science & Applications,12, 593-604 (2023).
Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities[J]. 光:科学与应用, 2023,12(4):593-604. DOI: 10.1038/s41377-023-01083-9.
Dover, N. P.et al. Enhanced ion acceleration from transparencydriven foils demonstrated at two ultraintense laser facilities.Light: Science & Applications,12, 593-604 (2023). DOI: 10.1038/s41377-023-01083-9.
Laser-driven ion sources are a rapidly developing technology producing high energy
high peak current beams. Their suitability for applications
such as compact medical accelerators
motivates development of robust acceleration schemes using widely available repetitive ultraintense femtosecond lasers. These applications not only require high beam energy
but also place demanding requirements on the source stability and controllability. This can be seriously affected by the laser temporal contrast
precluding the replication of ion acceleration performance on independent laser systems with otherwise similar parameters. Here
we present the experimental generation of
>
60 MeV protons and
>
30 MeV u
−1
carbon ions from sub-micrometre thickness Formvar foils irradiated with laser intensities
>
10
21
Wcm
2
. Ions are accelerated by an extreme localised space charge field
$$\gtrsim$$
30 TVm
−1
over a million times higher than used in conventional accelerators. The field is formed by a rapid expulsion of electrons from the target bulk due to relativistically induced transparency
in which relativistic corrections to the refractive index enables laser transmission through normally opaque plasma. We replicate the mechanism on two different laser facilities and show that the optimum target thickness decreases with improved laser contrast due to reduced pre-expansion. Our demonstration that energetic ions can be accelerated by this mechanism at different contrast levels relaxes laser requirements and indicates interaction parameters for realising application-specific beam delivery.
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