اخبار و اعلانات
آمار
| تعداد نشریات | 38 |
| تعداد شماره‌ها | 1,240 |
| تعداد مقالات | 8,992 |
| تعداد مشاهده مقاله | 7,843,209 |
| تعداد دریافت فایل اصل مقاله | 4,704,937 |
تحریک و تقویت مُدهای هیبریدی در موجبرهای پلاسمایی ترکیبی دایروی- بیضوی شامل باریکه الکترونی نسبیتی | ||
| الکترومغناطیس کاربردی | ||
| دوره 11، شماره 1 - شماره پیاپی 26، خرداد 1402، صفحه 61-73 اصل مقاله (1.09 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| مسلم علیزاده فر1؛ زینب رحمانی* 2؛ عباس عبدلی آرانی3 | ||
| 1دانشجوی دکترا، دانشکده فیزیک، دانشگاه کاشان، کاشان، ایران | ||
| 2استادیار، دانشکده فیزیک، دانشگاه کاشان، کاشان، ایران | ||
| 3دانشیار، دانشکده فیزیک، دانشگاه کاشان، کاشان، ایران | ||
| تاریخ دریافت: 10 آذر 1400، تاریخ بازنگری: 24 دی 1400، تاریخ پذیرش: 15 تیر 1401 | ||
| چکیده | ||
| معادله پاشندگی و نرخ رشد امواج الکترومغناطیسی هیبریدی منتشره در دو نوع موجبر ترکیبی با دیواره رسانای کامل شامل ستون پلاسمای سرد همسانگرد که توسط باریکه الکترونی نسبیتی تغذیه میشوند، مورد مطالعه قرار میگیرد. دیواره رسانای موجبر نخست دارای سطح مقطع بیضوی است که ستون پلاسما با مقطع دایره در مرکز آن قرار گرفته و بقیه نواحی داخلی از مرز پلاسما تا مرز موجبر با ماده دیالکتریک پر شده است. اما موجبر دوم دارای سطح مقطع دایروی است که ستون پلاسمای بیضوی در مرکز آن قرار گرفته است. باریکههای الکترونی بعنوان چشمه انرژی بصورت هم محور با ستون پلاسما به داخل آن تزریق میشوند. با محاسبه مؤلفههای میدانهای الکترومغناطیسی در هر یک از نواحی پیکربندی های مورد مطالعه و اعمال شرایط مرزی، فرکانس کار و نرخ رشد بدست میآیند. نتایج محاسبات عددی به صورت نمودار ارائه میگردد. | ||
| کلیدواژه‌ها | ||
| باریکه الکترونی نسبیتی؛ پلاسمای سرد؛ معادله پاشندگی؛ موجبر ترکیبی؛ نرخ رشد زمانی | ||
| عنوان مقاله [English] | ||
| Excitation and amplification of hybrid modes in circular-elliptic combined plasma waveguides including relativistic electron beam | ||
| نویسندگان [English] | ||
| Moslem Alizadehfar1؛ Zeinab Rahmani2؛ Abbas Abdoli Arani3 | ||
| 1PhD student, Faculty of Physics, Kashan University, Kashan, Iran | ||
| 2Assistant Professor, Faculty of Physics, Kashan University, Kashan, Iran | ||
| 3Associate Professor, Faculty of Physics, Kashan University, Kashan, Iran | ||
| چکیده [English] | ||
| The dispersion relation and the growth rate of the hybrid electromagnetic waves propagating in the two types of combined waveguides with complete conductor walls including isotropic cold plasma column that powered by relativistic electron beam, have been studied.The conducting wall cross section of the first waveguide is elliptical that plasma column with circular cross section is located in its core and the rest of interior regions is filled with dielectric material from the plasma boundary to the waveguide boundary. But the second waveguide has acircular cross section that elliptical plasma column is situated in its center. Electron beams as source energy are injected inside it coaxially with plasma column. By calculation of electromagnetic fields components in each of regions in the considered configurations, applying the boundary conditions, operating frequency and growth rate are obtained. The results of numerical computations are graphically presented. | ||
| کلیدواژه‌ها [English] | ||
| Relativistic electron beam, Cold plasma, Dispersion relation, Combined waveguide, Time growth rate | ||
| مراجع | ||
|
[1] B. Shokri and B. Jazi, "Spatial growth rate and field profiles of symmetric mode in a rod dielectric Čerenkov maser with a magnetized plasma column," Phys. Lett. A, vol. 336, no. 6, pp. 477-489, 2005 [2] J. Zheng, C. Yu, Z. Zheng, and K. Tanaka, "Cherenkov radiation generated by a beam of electrons revisited," Phys. Plasmas, vol. 12, no. 9, pp. 93-105, 2005. [3] P. D. Coleman and C. Enderby, "Megavolt electronics Cerenkov coupler for the production of millimeter and submillimeter waves," J. Appl. Phys, vol. 31, no.9, pp. 1695-1696, 1960. [4] B. Jazi, Z. Rahmani, E. Heidari-Semiromi, and A. Abdoli-Arani, "Time growth rate and field profiles of hybrid modes excited by a relativistic elliptical electron beam in an elliptical metallic waveguide with dielectric rod," Phys. Plasmas, vol. 19, no. 10, pp. 102-110, 2012. [5] A. Malakzadeh and M. Ahmadi, "Analytical Design and Simulation of a Corrugated Rectangular Waveguide Based on the Principles of the Backward-Wave Oscillator for Communication Band of THz Regime to Work in Troposphere," Scientific Journal of Applied Electromagnetics, vol. 7, no. 2, pp. 25-32, 2020. (In Persian) [6] M. Rouhani and B. Maraghechi, "Wave-mode dispersions in a relativistic electron beam with ion-channel guiding," Phys. Plasmas, vol. 13, no. 8, pp. 083-101, 2006. [7] L. Shenggang, Y. Yang, M. Jie, and D. M. Manos, "Theory of wave propagation along a waveguide filled with moving magnetized plasma," Phys. Rev. E, vol. 65, no. 3, p. 036411, 2002. [8] R. Bhatt and C. Chen, "Theory and simulation of nonrelativistic elliptic-beam formation with one-dimensional Child-Langmuir flow characteristics," Phys. Rev. ST Accel. Beams, vol. 8, no. 1, p. 014201, 2005. [9] S. J. Russell, Z.-F. Wang, W. B. Haynes, R. M. Wheat, Jr., B. E. Carlsten, L. M. Earley, S. Humphries, Jr., and P. Ferguson, "First observation of elliptical sheet beam formation with an asymmetric solenoid lens," Phys. Rev. ST Accel. Beams, vol. 8, no. 8, pp. 080401, 2005. [10] R. J. Bhatt, "Inverse problems in elliptic charged-particle beams," Massachusetts Institute of Technology, 2006. [11] J. Zhou, R. Bhatt, and C. Chen, "Cold-fluid theory of equilibrium and stability of a high-intensity periodically twisted ellipse-shaped charged-particle beam," Phys. Rev. ST Accel. Beams, vol. 9, no. 3, pp. 034401, 2006. [12] G. Caryotakis, A. Krasnykh, M. Neubauer, R. Phillips, G. Scheitrum, D. Sprehn, R. Steele, A. Jensen, and D. Smithe, "Design of a 11.4 GHz, 150-MW, Sheet Beam, PPM-Focused Klystron," AIP Conference Proceedings, vol. 691, no. 1, pp. 22-33, 2003. [13] B. E. Carlsten, "Modal analysis and gain calculations for a sheet electron beam in a ridged waveguide slow-wave structure," Phys. Plasmas, vol. 9, no. 12, pp. 5088-5096, 2002. [14] H. Freund and T. Abu-Elfadl, "Linearized field theory of a Smith-Purcell traveling wave tube," IEEE Trans. Plasma Sci., vol. 32, no. 3, pp. 1015-1027, 2004. [15] A. E. Brainerd, C. Chen, and J. Zhou, "Space-charge waves on relativistic elliptic electron beams," J. Appl. Phys, vol. 106, no. 2, pp. 023310, 2009. [16] B. Jazi and B. Shokri, "Excitation of electromagnetic surface waves by an annular electron beam in a plasma waveguide with a dielectric rod and a magnetized plasma column," Plasma Phys. Controlled Fusion, vol. 47, no. 1, pp. 37-47, 2005. [17] M. A. K. n. M. Birau, M.V. Kuzelev, A.A. Rukhadze, "Topicals Problems," Phys.-Usp., vol. 40, pp. 975-992, 1997. [18] N. W. McLachlan, "Theory and Applications of Mathieu Functions", Dover, New York, 1964. [19] Z. Rahmani, E. Heidari-Semiromi, and S. Safari, “Excitation of THz hybrid modes in an elliptical dielectric rod waveguide with a cold collisionless unmagnetized plasma column by an annular electron beam,” Phys. Plasmas, vol. 23, no. 6, pp. 062113, 2016. | ||
|
آمار تعداد مشاهده مقاله: 4,273 تعداد دریافت فایل اصل مقاله: 3,029 |
||