The electron linear accelerators driving modern X-ray free-electron lasers can emit intense, tunable, quasi-monochromatic terahertz (THz) transients with peak electric fields of V Å-1 and peak magnetic fields in excess of 10 T when a purpose-built, compact, superconducting THz undulator is implemented. New research avenues such as X-ray movies of THz-driven mode-selective chemistry come into reach by making dual use of the ultra-short GeV electron bunches, possible by a rather minor extension of the infrastructure.

中文翻译：

---

X射线自由电子激光器产生的伏特级太赫兹场。

驱动现代X射线自由电子激光器的电子线性加速器可以发出强烈的，可调谐的准单色太赫兹（THz）瞬态信号，当专门制造时，其峰值电场为VÅ-1，峰值磁场超过10 T ，实现了紧凑的超导太赫兹波荡器。通过对超短GeV电子束的双重利用，可以通过基础设施的较小扩展来实现THz驱动的模式选择化学的X射线电影等新的研究途径。