Theory of terahertz Smith-Purcell radiation from a cylindrical grating
An analysis of an annular electron beam propagating along a cylindrical grating with external magnetic field Bo is presented. The grating comprises a dielectric in its slots. The dispersion relation of the modes is derived. The results demonstrate that the dielectric shifts the frequencies of the sy...
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| Format: | Article |
| Language: | English |
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Papers in Physics
2019-10-01
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| Series: | Papers in Physics |
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| Online Access: | https://www.papersinphysics.org/papersinphysics/article/view/513 |
| _version_ | 1818142606830338048 |
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| author | Z. Rezaei B. Farokhi |
| author_facet | Z. Rezaei B. Farokhi |
| author_sort | Z. Rezaei |
| collection | DOAJ |
| description | An analysis of an annular electron beam propagating along a cylindrical grating with external magnetic field Bo is presented. The grating comprises a dielectric in its slots. The dispersion relation of the modes is derived. The results demonstrate that the dielectric shifts the frequencies of the system modes to smaller values. The growth rates of the modes which are in phase with the beam are also considered. It is found that the decline in the growth rate is brought about by the dielectric. In addition, increasing the thickness of the dielectric and decreasing the height of the slots cause it to rise. The effect of beam thickness on growth rate is considered too. This is shown to increase and then fall as beam thickness increases. These results show that utilizing cylindrical grating loaded with dielectric has a promising effect on developing new kinds of compact high-efficient THz free-electron lasers based on Smith–Purcell radiation.
Edited by: A. B. Márquez |
| first_indexed | 2024-12-11T11:18:27Z |
| format | Article |
| id | doaj.art-3179054d63174d71b8db0f72f2b8fc28 |
| institution | Directory Open Access Journal |
| issn | 1852-4249 |
| language | English |
| last_indexed | 2024-12-11T11:18:27Z |
| publishDate | 2019-10-01 |
| publisher | Papers in Physics |
| record_format | Article |
| series | Papers in Physics |
| spelling | doaj.art-3179054d63174d71b8db0f72f2b8fc282022-12-22T01:09:14ZengPapers in PhysicsPapers in Physics1852-42492019-10-011110.4279/pip.110007Theory of terahertz Smith-Purcell radiation from a cylindrical gratingZ. Rezaei0B. Farokhi1Department of Physics, Faculty of Science, Arak University, Arak, P.O. Box 38156-8-8349, IranDepartment of Physics, Faculty of Science, Arak University, Arak, P.O. Box 38156-8-8349, IranAn analysis of an annular electron beam propagating along a cylindrical grating with external magnetic field Bo is presented. The grating comprises a dielectric in its slots. The dispersion relation of the modes is derived. The results demonstrate that the dielectric shifts the frequencies of the system modes to smaller values. The growth rates of the modes which are in phase with the beam are also considered. It is found that the decline in the growth rate is brought about by the dielectric. In addition, increasing the thickness of the dielectric and decreasing the height of the slots cause it to rise. The effect of beam thickness on growth rate is considered too. This is shown to increase and then fall as beam thickness increases. These results show that utilizing cylindrical grating loaded with dielectric has a promising effect on developing new kinds of compact high-efficient THz free-electron lasers based on Smith–Purcell radiation. Edited by: A. B. Márquezhttps://www.papersinphysics.org/papersinphysics/article/view/513Smith Purcell radiationcylindrical gratingdielectricterahertz radiation |
| spellingShingle | Z. Rezaei B. Farokhi Theory of terahertz Smith-Purcell radiation from a cylindrical grating Papers in Physics Smith Purcell radiation cylindrical grating dielectric terahertz radiation |
| title | Theory of terahertz Smith-Purcell radiation from a cylindrical grating |
| title_full | Theory of terahertz Smith-Purcell radiation from a cylindrical grating |
| title_fullStr | Theory of terahertz Smith-Purcell radiation from a cylindrical grating |
| title_full_unstemmed | Theory of terahertz Smith-Purcell radiation from a cylindrical grating |
| title_short | Theory of terahertz Smith-Purcell radiation from a cylindrical grating |
| title_sort | theory of terahertz smith purcell radiation from a cylindrical grating |
| topic | Smith Purcell radiation cylindrical grating dielectric terahertz radiation |
| url | https://www.papersinphysics.org/papersinphysics/article/view/513 |
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