Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities.
Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities.
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DOI：
10.1038/s41377-023-01083-9
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发表时间：
2023-03-13
影响因子：
19.4
通讯作者：
Nishiuchi, Mamiko
中科院分区：
文献类型：
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作者：
Dover, Nicholas P. P.;Ziegler, Tim;Assenbaum, Stefan;Bernert, Constantin;Bock, Stefan;Brack, Florian-Emanuel;Cowan, Thomas E. E.;Ditter, Emma J. J.;Garten, Marco;Gaus, Lennart;Goethel, Ilja;Hicks, George S. S.;Kiriyama, Hiromitsu;Kluge, Thomas;Koga, James K. K.;Kon, Akira;Kondo, Kotaro;Kraft, Stephan;Kroll, Florian;Lowe, Hazel F. F.;Metzkes-Ng, Josefine;Miyatake, Tatsuhiko;Najmudin, Zulfikar;Pueschel, Thomas;Rehwald, Martin;Reimold, Marvin;Sakaki, Hironao;Schlenvoigt, Hans-Peter;Shiokawa, Keiichiro;Umlandt, Marvin E. P.;Schramm, Ulrich;Zeil, Karl;Nishiuchi, Mamiko
激光驱动离子源是一种快速发展的产生高能量、高峰电流束的技术。它们对于紧凑型医疗加速器等应用的适用性，促使人们开发使用广泛可用的重复性超强飞秒激光器的稳健加速方案。这些应用不仅需要高的束流能量，而且对源的稳定性和可控性提出了苛刻的要求。这可能会受到激光时间对比度的严重影响，从而排除了在具有类似参数的独立激光系统上复制离子加速性能。在这里，我们提出了实验产生的>60 MeV质子和>30 MeV u−1碳离子从亚微米厚度的Formvar箔照射与激光强度>1021 Wcm 2。离子的加速是由一个极端的局部空间电荷场1030 TVm-1，比传统加速器高出一百万倍。该领域是由快速驱逐的电子从目标散装由于相对论诱导的透明度，其中相对论修正的折射率，使激光传输通过通常不透明的等离子体。我们在两个不同的激光设备上复制该机制，并表明由于减少了预膨胀，最佳靶厚度随着激光对比度的提高而降低。我们的演示，高能离子可以通过这种机制在不同的对比度水平上加速放松激光的要求，并表示实现特定应用的光束传输的相互作用参数。高能离子被相对论透明过程中诱导的极端空间电荷场加速，并通过调整靶厚度以适应各个激光参数来优化
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 >1021 Wcm2. Ions are accelerated by an extreme localised space charge field ≳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. High energy ions were accelerated by extreme space charge fields induced during relativistic transparency and optimised by tuning the target thickness to the individual laser parameters
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影响因子：
16.6
作者：
Dromey B;Coughlan M;Senje L;Taylor M;Kuschel S;Villagomez-Bernabe B;Stefanuik R;Nersisyan G;Stella L;Kohanoff J;Borghesi M;Currell F;Riley D;Jung D;Wahlström CG;Lewis CL;Zepf M
通讯作者：
Zepf M
影响因子：
8.7
作者：
Fryxell, B;Olson, K;Tufo, H
通讯作者：
Tufo, H
影响因子：
3.3
作者：
Goodman, J.;King, M.;McKenna, P.
通讯作者：
McKenna, P.
影响因子：
8.6
作者：
Henig, A.;Kiefer, D.;Hegelich, B. M.
通讯作者：
Hegelich, B. M.
影响因子：
8.6
作者：
Esirkepov, T;Borghesi, M;Tajima, T
通讯作者：
Tajima, T