First demonstration of collimation and monochromatisation of a laser accelerated proton burst
First demonstration of collimation and monochromatisation of a laser accelerated proton burst
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DOI：
10.1017/s0263034608000712
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发表时间：
2008-12
影响因子：
0.9
通讯作者：
S. Ter-Avetisyan;M. Schnürer;R. Polster;P. Nickles;W. Sandner
中科院分区：
文献类型：
--
作者：
S. Ter-Avetisyan;M. Schnürer;R. Polster;P. Nickles;W. Sandner
激光产生的离子束具有大的发散角和宽的能量分布。据我们所知，这是首次利用永磁四极透镜系统对激光加速质子束进行准直和单色化的演示。它通过准直或聚焦具有相同能量的质子，起到可调谐带通滤波器的作用。由于它几乎收集了整个质子发射，束流密度出现了大幅增强。对于准直后的束流，在（3.7±0.3）MeV能段，相对于未准直的束流，质子密度从可能的40增加到约30倍。借助这种简单、可靠且成熟的技术，将为科学和技术开辟新的前景，在任何有激光加速离子源的实验室都能获得单能离子束。这一发现使得随后能够将众所周知的束流导向技术应用于所形成的离子束，这些技术在传统加速器中用于操控束流参数或传输束流，并使其在许多应用中得到使用。
Laser produced ion beams have a large divergence angle and a wide energy spread. To our knowledge, this is the first demonstration of collimation and monochromatisation of laser accelerated proton beams, using a permanent quadrupole magnet lens system. It acts as a tunable band pass filter by collimating or focusing the protons with the same energy. Because it gathers nearly the whole proton emission, a strong enhancement of the beam density appears. For the collimated beam, an increase of the proton density in the (3.7 ± 0.3) MeV energy band up to a factor of ~30, from possible 40, relative to the non-collimated beam is demonstrated. With the help of this simple, reliable, and well established technique new perspectives will be opened for science and technology, monoenergetic ion beams can be attained in any lab, where a source of laser accelerated ions exist. This finding enables to apply afterward well known beam steering techniques to the formed ion beam, which are applied in conventional accelerators to manipulate the beam parameters or to transport the beams and make them use in many application.