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Dynamic control of laser driven proton beams by exploiting self-generated, ultrashort electromagnetic pulses

机译:利用自生超短电磁脉冲动态控制激光驱动质子束

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摘要

As part of the ultrafast charge dynamics initiated by high intensity laser irradiations of solid targets,high amplitude EM pulses propagate away from the interaction point and are transported along anystalks and wires attached to the target. The propagation of these high amplitude pulses along a thinwire connected to a laser irradiated target was diagnosed via the proton radiography technique,measuring a pulse duration of 20 ps and a pulse velocity close to the speed of light. The strongelectric field associated with the EM pulse can be exploited for controlling dynamically the protonbeams produced from a laser-driven source. Chromatic divergence control of broadband laser drivenprotons (upto 75% reduction in divergence of 5 MeV protons) was obtained by winding the supportingwire around the proton beam axis to create a helical coil structure. In addition to providingfocussing and energy selection, the technique has the potential to post-accelerate the transiting protonsby the longitudinal component of the curved electric field lines produced by the helical coil lens.
机译:作为对固体靶物进行高强度激光辐照而引发的超快电荷动力学的一部分,高振幅EM脉冲传播远离相互作用点,并沿与靶物相连的任何茎杆和导线传输。这些高振幅脉冲沿着连接到激光辐照目标的细线传播是通过质子射线照相技术诊断的,测量的脉冲持续时间为20 ps,脉冲速度接近光速。可以利用与EM脉冲相关的强电场来动态控制从激光驱动源产生的质子束。宽带激光驱动质子的色散控制(> 5 MeV质子的散度最多降低75%)是通过将支撑线绕质子束轴缠绕以创建螺旋线圈结构来实现的。除了提供聚焦和能量选择之外,该技术还具有通过螺旋线圈透镜产生的弯曲电场线的纵向分量来使传输质子后加速的潜力。

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