Enhancement of superradiance using modified intense relativistic electron beams

使用改进的强相对论电子束增强超辐射

• 批准号: 15540468
• 负责人: KAMADA Keiichi
• 金额: $ 1.98万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540468/
• 关键词: electron beam; superradiance; microwave; intence electromagnetic wave; cavity; S-band; autoacceleration; 大強度電子ビーム; 加速空洞

Stimulated emission from electron bunches - superradiance(SR) is an attractive method of generating ultrashort electromagnetic pulses. Here, we carried out the experiments on S-band superradiance. The most effective generation of SR pulses at S-band is obtained by Cherenkov mechanism with short electron beam moving in corrugated waveguide. And the long wavelength in S-band makes it possible to employ an intense relativistic electron beam with pulse duration of 10 ns. In the experiment, 5 GHz, 300 MW microwave with duration of 5 ns was obtained using a 600 keV, 5 kA intense relativistic electron beam with duration of 12 ns injected into the corrugated waveguide. The radiation mode was observed to be TM01 as expected in SR. PIC simulation indicated that the radiation was caused by superradiance. A coaxial cavity was used to modify the time evolution of the energy waveform of an electron beam. The output power of SR was 20% increased using the modified energy waveform. It could be possible to increase the output power of superradiance by modifying the energy waveform of an intense electron beam.

电子束团受激辐射-超辐射（SR）是产生超短电磁脉冲的一种有吸引力的方法.在这里，我们进行了S波段超辐射实验。利用波纹波导中短电子束的切伦科夫机制，获得了S波段最有效的SR脉冲。而S波段的长波长使得采用脉宽为10 ns的强流相对论电子束成为可能。在实验中，用脉宽为12 ns的600 keV、5 kA强流相对论电子束注入波纹波导，获得了脉宽为5 ns的5 GHz、300 MW微波输出。PIC模拟表明，该辐射是由超辐射引起的。利用同轴腔对电子束能量波形的时间演化进行了修正。使用改进的能量波形，SR的输出功率增加了20%。通过改变强流电子束的能量波形，可以提高超辐射的输出功率。

项目成果

C-band intense microwave radiation with a cylindrical corrugated waveguide

采用圆柱形波纹波导的 C 波段强微波辐射

• 期刊: Research Report NIFS-PROC (to be published)
• 作者: K.Ishibana;T.Nishiguchi;N.Tomisawa;K.Yamamoto;R.Ando;K.Kamada
• 通讯作者: K.Kamada

H.Shirasaka 他: "Design of a 5GHz cylindrical corrugated waveguide and a formation of an energy increasing IREB"Research Report NIFS-PROC-54. 60-69 (2003)

H. Shirasaka 等人：“5GHz 圆柱形波纹波导的设计和能量增加 IREB 的形成”研究报告 NIFS-PROC-54 (2003)。

Energy and current waveforms of an intense wlwctron beam passing through cavities

穿过空腔的强 wlwctron 光束的能量和电流波形

• 发表时间: 2005
• 期刊: IEEE Trans FM 125
• 作者: N.Tomisawa;K.Yamamoto;R.Ando;K.Kamada
• 通讯作者: K.Kamada

Intense microwave radiation with an IREB

IREB 的强微波辐射

• 发表时间: 2004
• 期刊: The papers of Technical Meeting on Plasma Science and Technology. IEE, JAPAN. PST-04-86
• 作者: K.Yamamoto;R.Nakajima;N.Tomisawa;R.Ando;K.Kamada
• 通讯作者: K.Kamada

N.S.Ginzburg 他: "Optimization of electron bunch waveform for increasing peak power of superradiance pulses"Opt.Commun.. (to be published).

N.S.Ginzburg 等人：“优化电子束波形以增加超辐射脉冲的峰值功率”Opt.Commun..（待出版）。