Towards highest peak intensities for ultra-short MeV-range ion bunches.
Towards highest peak intensities for ultra-short MeV-range ion bunches.
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DOI：
10.1038/srep12459
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发表时间：
2015-07-27
影响因子：
4.6
通讯作者：
Roth M
中科院分区：
文献类型：
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作者：
Busold S;Schumacher D;Brabetz C;Jahn D;Kroll F;Deppert O;Schramm U;Cowan TE;Blažević A;Bagnoud V;Roth M
一个激光驱动的，多MeV范围的离子束线已安装在GSI亥姆霍兹中心的重离子研究。高功率激光器PHELIX驱动μm尺度的超短（皮秒）离子加速，连续光谱中质子的能量范围高达28.4 MeV。源后面的必要的束成形是通过应用磁离子透镜（如四极和四极）和射频腔来完成的。基于激光驱动源独特的束流特性，在最近的实验中可以产生并表征强流单聚束：在中心能量为7.8 MeV时，通过相位聚焦可以将多达5 × 108个质子及时重新聚焦到半高宽（FWHM）聚束长度τ =（462 ± 40）ps。这些聚束显示出在10%和15%之间的中等能量分布（ΔE/E0在FWHM处），并且在距离源6 m处可用，从而与苛刻的激光-物质相互作用环境分离。这些成功的实验代表了开发新型激光驱动离子束线和获得超短MeV范围离子束的最高峰值强度的基础。
A laser-driven, multi-MeV-range ion beamline has been installed at the GSI Helmholtz center for heavy ion research. The high-power laser PHELIX drives the very short (picosecond) ion acceleration on μm scale, with energies ranging up to 28.4 MeV for protons in a continuous spectrum. The necessary beam shaping behind the source is accomplished by applying magnetic ion lenses like solenoids and quadrupoles and a radiofrequency cavity. Based on the unique beam properties from the laser-driven source, high-current single bunches could be produced and characterized in a recent experiment: At a central energy of 7.8 MeV, up to 5 × 108 protons could be re-focused in time to a FWHM bunch length of τ = (462 ± 40) ps via phase focusing. The bunches show a moderate energy spread between 10% and 15% (ΔE/E0 at FWHM) and are available at 6 m distance to the source und thus separated from the harsh laser-matter interaction environment. These successful experiments represent the basis for developing novel laser-driven ion beamlines and accessing highest peak intensities for ultra-short MeV-range ion bunches.