Enhanced ion acceleration from transparency-driven foils demonstrated at two ultraintense laser facilities  

作　　者：Nicholas P.Dover Tim Ziegler Stefan Assenbaum Constantin Bernert Stefan Bock Florian-Emanuel Brack Thomas E.Cowan Emma J.Ditter Marco Garten Lennart Gaus Ilja Goethel George S.Hicks Hiromitsu Kiriyama Thomas Kluge James K.Koga Akira Kon Kotaro Kondo Stephan Kraft Florian Kroll Hazel F.Lowe Josefine Metzkes-Ng Tatsuhiko Miyatake Zulfikar Najmudin Thomas Püschel Martin Rehwald Marvin Reimold Hironao Sakaki Hans-Peter Schlenvoigt Keiichiro Shiokawa Marvin E.P.Umlandt Ulrich Schramm Karl Zeil Mamiko Nishiuchi 

机构地区：[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 SW72AZ,United Kingdom [3]Helmholtz-Zentrum Dresden-Rossendorf,01328 Dresden,Germany [4]Technische Universitat Dresden,01069 Dresden,Germany [5]Interdiscipllinary Graduate School of Engineering Sciences,Kyushu University,6-1,Kasuga-Koen,Kasuga,Fukuoka 816-8580,Japan

出　　处：《Light(Science & Applications)》2023年第4期593-604,共12页光（科学与应用)（英文版）

基　　金：supported by Kakenhi Grant No.16K05506,Grant No.20H00140,Grant No.21KK0049,Grant No.22H00121,JST PRESTO Grant No.JPMJPR16P9,QST President's Strategic Grant(QST) International Research Initiative(AAA98)and Creative Research(ABACS),and by Laserlab Europe V(PRISES,contract no.871124);supported by EU's Horizon 2020 research and innovation program under the Marie Sktodowska-Curie grant agreement No 894679;support by JST-Mirai Program Grant Number JPMJMI17A1,Japan.N.P.D.,EJ.D.,G.S.H.,Z.N.acknowledge support from STFC grants ST/P002021/1,STN001639/1.

摘　　要：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≥30TVm-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.

关 键 词：ACCELERATION INTENSE TRANSPARENCY 

分 类 号：TN24[电子电信—物理电子学]