Associate Professor Haneda, Assistant Professor Arashida, and colleagues develop a general-purpose evaluation method for extremely short electron beam pulses

Electron beams with extremely short pulse widths have been used to observe the instantaneous motion of atoms and molecules in materials. This measurement technology is expected to contribute to the development of high-speed information and communications that surpass 5G. The time resolution of the measurement is determined by the pulse width of the electron beam. However, there are only a limited number of methods to evaluate the pulse width of extremely short pulsed electron beams, and there has been no general-purpose, easy-to-use method to evaluate the pulse width.
The research team has shown that by successfully analyzing the low-frequency component of the signal obtained by the terahertz-wave streaking method, it is possible to evaluate electron-beam pulses of 10 trillionths of a second or more, as well as those of less than 10 trillionths of a second. Furthermore, the terahertz wave intensity required for this method is weak, less than a few kV/cm, and we have shown that this is a versatile and simple method that can evaluate electron beam pulses with time scales of 1/trillion to 10 trillionths of a second without constructing a special measurement setup in a vacuum apparatus.

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https://www.tsukuba.ac.jp/journal/technology-materials/20221214000000.html