Efficient post-acceleration of protons in helical coil targets driven by sub-ps laser pulses.
Efficient post-acceleration of protons in helical coil targets driven by sub-ps laser pulses.
复制标题
DOI：
10.1038/s41598-017-06985-4
复制
发表时间：
2017-09-07
影响因子：
4.6
通讯作者：
Borghesi M
中科院分区：
文献类型：
--
作者：
Ahmed H;Kar S;Cantono G;Hadjisolomou P;Poye A;Gwynne D;Lewis CLS;Macchi A;Naughton K;Nersisyan G;Tikhonchuk V;Willi O;Borghesi M
激光驱动质子束的特性可以有效地控制和优化，采用最近开发的螺旋线圈技术，利用瞬态自充电的固体靶照射强激光脉冲。在这里，我们展示了一个良好的准直（<1°发散）和窄带宽（~10%的能量扩展）的质子子束的~107粒子在10 ± 0.5 MeV的照射螺旋线圈的目标与几焦耳，亚ps激光脉冲的强度约为2 × 1019 W cm−2。实验数据与粒子追踪模拟结果吻合良好，表明线圈内质子的后加速速率约为0.7 MeV/mm，这与S. Kar等人，Nat·Commun，7，10792（2016）。从激光照射的目标的热电子逃逸的动力学数值研究这两个照射制度，这表明，目标的自充电可以优化在几百fs的脉冲持续时间。该信息对于在未来的实验中最大化加速后梯度是非常有益的。
The characteristics of laser driven proton beams can be efficiently controlled and optimised by employing a recently developed helical coil technique, which exploits the transient self-charging of solid targets irradiated by intense laser pulses. Here we demonstrate a well collimated (<1° divergence) and narrow bandwidth (~10% energy spread) proton beamlet of ~107 particles at 10 ± 0.5 MeV obtained by irradiating helical coil targets with a few joules, sub-ps laser pulses at an intensity of ~2 × 1019 W cm−2. The experimental data are in good agreement with particle tracing simulations suggesting post-acceleration of protons inside the coil at a rate ~0.7 MeV/mm, which is comparable to the results obtained from a similar coil target irradiated by a fs class laser at an order of magnitude higher intensity, as reported in S. Kar et al., Nat. Commun, 7, 10792 (2016). The dynamics of hot electron escape from the laser irradiated target was studied numerically for these two irradiation regimes, which shows that the target self-charging can be optimised at a pulse duration of few hundreds of fs. This information is highly beneficial for maximising the post-acceleration gradient in future experiments.
登录
查看更多内容
DOI：
10.1016/j.nima.2003.11.199
发表时间：
2004-04-21
影响因子：
1.4
作者：
Breschi, E;Borghesi, M;Romagnani, L
通讯作者：
Romagnani, L
影响因子：
1.6
作者：
Doria, D.;Kakolee, K. F.;Borghesi, M.
通讯作者：
Borghesi, M.
影响因子：
0.9
作者：
Dzelzainis, T.;Nersisyan, G.;Lewis, C. L. S.
通讯作者：
Lewis, C. L. S.
影响因子：
1.6
作者：
Nuernberg, F.;Schollmeier, M.;Roth, M.
通讯作者：
Roth, M.
影响因子：
19.6
作者：
Robson, L.;Simpson, P. T.;McKenna, P.
通讯作者：
McKenna, P.