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The Generation of Highly Intense THz Radiation based on Smith-Purcell Radiation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Xu, Yuanfang He, Zhigang Jia, Qika Li, Weiwei |
| Copyright Year | 2015 |
| Abstract | A photocathode RF gun can generate trains of THz subpicosecond electron bunches by illuminating the cathode with trains of laser pulses. Let this electron bunches passes close to the surface of a lamellar grating, THz radiation will be emitted, which is the so-called Smith-Purcell Radiation (SPR). If the lamellar grating has a narrow groove, this radiation will be narrow band. By choosing suitable parameters, the SPR frequency can be resonant with the electron bunches frequency, and then generate highly intense, narrow band THz coherent radiation. COHERENT SMITH-PURCELL RADIATION When an electron beam passes close to the surface of a periodic structure (such as a metallic grating), radiation is emitted because of the interaction of the particles with the periodic structure, which is the so-called Smith-Purcell radiation (SPR)[1]. The intensity of radiation is proportional to the number of periods of the grating (Ng), hence it is strongly compared to other coherent radiation generation techniques such as synchrotron, transition and diffraction radiation. Figure 1: Definition of the geometry. The electron beam moves with constant reduced velocity v0 = β0c at a distance z = z0 parallel to the grating surface in x-direction. According to the theory of di Francia[2], the emission mechanism of SP radiation can be interpreted in analogy to the diffraction of light as the diffraction of the field of the electrons (virtual photons) which pass the grating at a distance z0 away from its surface by the grating grooves. One characteristic signature of SPR is that it must fulfill Supported by National Natural Science Foundation of China (No. 11205152 and No. 11375199) and Fundamental Research Funds for the Central Universities (No. WK2310000042 and No. WK2310000047). These authors contributed equally to this work Now at INFN, Italy as a joint PhD student. Corresponding author, email: hezhg@ustc.edu.cn the dispersion relation |
| Starting Page | 1654 |
| Ending Page | 1656 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| DOI | 10.18429/JACoW-IPAC2015-TUPJE017 |
| Alternate Webpage(s) | https://jacowfs.jlab.org/conf/proceedings/IPAC2015/papers/tupje017.pdf |
| Alternate Webpage(s) | https://jacowfs.jlab.org/conf/y15/ipac15/prepress/TUPJE017.PDF |
| Alternate Webpage(s) | http://accelconf.web.cern.ch/AccelConf/IPAC2015/papers/tupje017.pdf |
| Alternate Webpage(s) | https://doi.org/10.18429/JACoW-IPAC2015-TUPJE017 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
