Zhao Lingrong, Tang Heng, Lu Chao, Jiang Tao, Zhu Pengfei, Hu Long, Song Wei, Wang Huida, Qiu Jiaqi, Jing Chunguang, Antipov Sergey, Xiang Dao, Zhang Jie
Key Laboratory for Laser Plasmas (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China.
Phys Rev Lett. 2020 Feb 7;124(5):054802. doi: 10.1103/PhysRevLett.124.054802.
We propose and demonstrate a method to reduce the pulse width and timing jitter of a relativistic electron beam through THz driven beam compression. In this method the longitudinal phase space of a relativistic electron beam is manipulated by a linearly polarized THz pulse copropagating in a dielectric tube such that the bunch tail has a higher velocity than the bunch head, which allows simultaneous reduction of both pulse width and timing jitter after passing through a drift. In this experiment, the beam is compressed by more than a factor of 4 from 130 fs to 28 fs with the arrival time jitter also reduced from 97 fs to 36 fs, opening up new opportunities in using pulsed electron beams for studies of ultrafast dynamics. This technique provides an effective way to manipulate beam longitudinal phase space with a THz pulse and may have a strong impact in accelerator and ultrafast science facilities that require femtosecond electron beams with tight synchronization to external lasers.
我们提出并演示了一种通过太赫兹驱动的束流压缩来减小相对论电子束脉冲宽度和时间抖动的方法。在该方法中，相对论电子束的纵向相空间由在介质管中同向传播的线偏振太赫兹脉冲操纵，使得束团尾部的速度高于束团头部，这使得在经过一段漂移后能够同时减小脉冲宽度和时间抖动。在本实验中，束流从130飞秒被压缩至28飞秒，压缩因子超过4倍，到达时间抖动也从97飞秒减小至36飞秒，为利用脉冲电子束研究超快动力学开辟了新机遇。该技术提供了一种用太赫兹脉冲操纵束流纵向相空间的有效方法，可能会对需要与外部激光紧密同步的飞秒电子束的加速器和超快科学设施产生重大影响。
