Monochromaticity of coherent Smith-Purcell radiation from finite size grating
Monochromaticity of coherent Smith-Purcell radiation from finite size grating
复制标题
DOI：
10.1103/physrevaccelbeams.20.024701
复制
发表时间：
2017-02-13
影响因子：
1.7
通讯作者：
Urakawa, J.
中科院分区：
文献类型：
--
作者：
Aryshev, A.;Potylitsyn, A.;Urakawa, J.
对相干Smith-Purcell辐射(SPR)的光谱特性进行了实验和数值模拟研究。在KEK LUCX装置上进行了不同衍射级SPR谱线形状的测量。测量中使用了一对室温肖特基势垒二极管(SBD)探测器，灵敏度带分别为60-90 GHz和320-460 GHz。用CST Studio Suite进行的实验结果和模拟结果的合理吻合证明了使用不同的窄带SBD探测器来研究不同的SPR衍射级是合理的。结果表明，SPR谱线的单色性随衍射级数的增加而增加。在亚太赫兹频率范围内，相干跃迁辐射和相干SPR强度的比较表明，两种辐射机制的亮度是相当的。讨论了SPR谱线微调的可行性。
Investigation of coherent Smith-Purcell radiation (SPR) spectral characteristics was performed both experimentally and by numerical simulation. The measurement of SPR spectral line shapes of different diffraction orders was carried out at the KEK LUCX facility. A pair of room-temperature Schottky barrier diode (SBD) detectors with sensitivity bands of 60-90 GHz and 320-460 GHz was used in the measurements. Reasonable agreement of experimental results and simulations performed with CST Studio Suite justifies the use of different narrow-band SBD detectors to investigate different SPR diffraction orders. It was shown that monochromaticity of the SPR spectral lines increases with diffraction order. The comparison of coherent transition radiation and coherent SPR intensities in sub-THz frequency range showed that the brightnesses of both radiation mechanisms were comparable. A fine tuning feasibility of the SPR spectral lines is discussed.