Accelerating monoenergetic protons from ultrathin foils by flat-top laser pulses in the directed-Coulomb-explosion regime.
Accelerating monoenergetic protons from ultrathin foils by flat-top laser pulses in the directed-Coulomb-explosion regime.
复制标题
DOI：
10.1103/physreve.78.026412
复制
发表时间：
2008-08
影响因子：
2.4
通讯作者：
Maksimchuk, A.
中科院分区：
文献类型：
--
作者：
Bulanov, S. S.;Brantov, A.;Bychenkov, V. Yu.;Chvykov, V.;Kalinchenko, G.;Matsuoka, T.;Rousseau, P.;Reed, S.;Yanovsky, V.;Litzenberg, D. W.;Krushelnick, K.;Maksimchuk, A.
在定向库仑爆炸条件下，研究了紧聚焦脉冲与超薄双层固体靶相互作用过程中，激光整形对质子加速的影响。在这种情况下，激光强迫前层的重离子主要沿脉冲传播方向膨胀，形成一个运动的纵向电荷分离电场，从而提高了第二层质子的加速效率。束流整形的应用，即平顶束流的使用，由于纵场的增加，导致了更有效的质子加速。
We consider the effect of laser beam shaping on proton acceleration in the interaction of a tightly focused pulse with ultrathin double-layer solid targets in the regime of directed Coulomb explosion. In this regime, the heavy ions of the front layer are forced by the laser to expand predominantly in the direction of the pulse propagation, forming a moving longitudinal charge separation electric field, thus increasing the effectiveness of acceleration of second-layer protons. The utilization of beam shaping, namely, the use of flat-top beams, leads to more efficient proton acceleration due to the increase of the longitudinal field.