Numerical Simulation and Experimental Study of High-Power Gyrotrons with Energy Recovery
- PDF / 650,752 Bytes
- 11 Pages / 594 x 792 pts Page_size
- 10 Downloads / 167 Views
Radiophysics and Quantum Electronics, Vol. 62, No. 11, April, 2020 (Russian Original Vol. 62, No. 11, November, 2019)
NUMERICAL SIMULATION AND EXPERIMENTAL STUDY OF HIGH-POWER GYROTRONS WITH ENERGY RECOVERY N. A. Zavol’sky, V. E. Zapevalov,∗ A. N. Kuftin, and A. S. Postnikova
UDC 621.385.69.01
We present the results of numerical simulation and experimental study of high-pow gyrotrons with recovery of the residual energy of the spent electron beam. The results of calculation of megawatt gyrotrons operated at frequencies of 110 and 170 GHz are given. A simplified method for calculating gyrotrons with energy recovery in the case of partial reflection of the electron beam is discussed. The method and results of experimental studies of gyrotrons with energy recovery are described and compared with the calculation data.
1.
INTRODUCTION
Recently, significant progress has been achieved in the field of developing high-power, high-efficiency gyrotrons and using them in various practical applications [1–7]. Millimeter-wave gyrotrons often employ collectors with recovery of the residual energy of the electron beam after the beam leaves the gyrotron cavity (spent beam). The use of collectors with energy recovery (also called depressed collectors) in gyrotrons, which was proposed already in [8], allows one to increase significantly the efficiency of gyrotron complexes, reduce the heat load on the collector, and make feeding and cooling systems simpler and less expensive [1–10]. However, it is possible to extract the residual energy of the beam using the deceleration field in the collector region up to a certain limit only, since a portion of the electron beam starts to be reflected, which, after a certain level, results in lower efficiency and unstable operation of the gyrotron. This imposes limitations on the possibility to increase efficiency of gyrodevices. In this respect, this work presents the results of studying the influence of reflection of a fraction of the electron beam for several versions of gyrotrons that use depressed collectors. For this purpose, a simple calculation method that allows for the influence of reflected electrons has been developed. The method does not require significant computational resources, which, in principle, makes it possible to use it for optimization of gyrodevices. Numerical simulation and experimental studies were performed for megawatt gyrotrons operated mainly at a frequency of 170 GHz, as well as for those operated at frequencies of 110 and 140 GHz. 2.
GYROTRON WITH RECOVERY OF THE RESIDUAL ENERGY OF THE ELECTRON BEAM AND THE METHOD OF NUMERICAL SIMULATION
Efficiency of a gyrotron with single-stage energy recovery is determined by the expression [10–14] η1 = η0 ∗
U0 , U0 − Ub
(1)
[email protected]
Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 62, No. 11, pp. 842–854, November 2019. Original article submitted November 5, 2019; accepted November 29, 2019. c 2020 Springer Sci
Data Loading...
