Quasi-monochromatic THz pulse generation using Cherenkov radiation from a spatially modulated electron beam
Quasi-monochromatic THz pulse generation using Cherenkov radiation from a spatially modulated electron beam
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DOI：
10.1088/1748-0221/15/04/c04016
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发表时间：
2020-04
影响因子：
1.3
通讯作者：
Y. Tadenuma;T. Murakami;M. Brameld;M. Washio;K. Sakaue;R. Kuroda;Y. Taira
中科院分区：
文献类型：
--
作者：
Y. Tadenuma;T. Murakami;M. Brameld;M. Washio;K. Sakaue;R. Kuroda;Y. Taira
Cherenkov radiation forms a wave front in a direction that depends on the density of the medium and the velocity of charged particles; therefore, ordinary electron bunches do not generate coherent radiation unless they are sufficiently compressed. In this work, we present the generation of a quasi-monochromatic THz pulse using an electron bunch with a periodic structure generated from a small rf gun. A coherent THz pulse was generated by matching the tilt angle of the electron bunch and Cherenkov radiation angle with a rf deflector. Furthermore, we attempted to render the THz pulse quasi-monochromatic by adding a periodic structure to the electron bunch using a multi-slit. Finally, using several band-pass filters, we successfully confirmed that the quasi-monochromatic operation was performed at frequencies of 0.2 and 0.3 THz.
