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Recently, at least, domestic developers give obvious preference coaxial magnetron. This aspiration is quite clear, though and not always justified. Many coaxial magnetrons (CM) both on separate parameters and on their set objectively surpass magnetron with anode straps and magnetron with the rising-sun resonator. Suppression in CM of mode competing at a level of the best type's classical magnetron with straps is realized much easier. Involves also an opportunity of application slow-wave circuit of the anodes (SWCA) with rather significant amount (more than 40) the resonators, necessity of reduction of the radial sizes of interaction space removing to a certain extent at reduction of a wave length or (and) the anode voltage.The comparative settlement estimation of a level of own losses dissipation not IT -mode 2-mm wave range magnetron [ 13 and the possible alternative variant, carried out on a technique [2], shows an opportunity of substantial growth of efficiency in the last.Modem CMs are created on a wave A =8 mm and in short-wave area it is considered one of the basic obstacles of promotion low stability of the form and thermo stability the gas station owing to restriction of thickness of her cylindrical wall in size (0,05 . . . 0,07) A. Sufficient stability of the form and thermostability it is possible to reach by application of the SWCA from molybdenum with a copper covering of an external surface of the anode block, that with other things being equal will result in increase in losses in the SWCA in 1,68 times. However, loss in the SWCA thus in -1, 5 times it is less in comparison with variant not IT -mode magnetron. More a serious obstacle at creation of short-wave CM is the problem of the organization of a necessary level of coupling of the SWCA with the stabilizing resonator (SR), generated in the small azimuthally extent of a peripheral wall of the SWCA. For the SWCA of a 2-mm wave range CM she does not exceed 0, 15 mm, and the minimal width of a coupling slot of the SWCA with SR at her manufacturing an electrode without a structure there are in area of 0, 1 mm. But the basic obstacle of promotion of CM in a short-wave part of a millimetric range of lengths of waves becomes growing difficulty of frequency control of generation. The aspiration to unload results the cathode in significant radial sizes SR owing to what dependence of own frequency of working kind SR on his axial size becomes extremely big and results practically in loss of frequency control of generation. We shall illustrate it by the example of attempt of creation of analogue magnetron RPB-8 (A 4, 3 mm) [3] with the parameters of space of interaction rising-sun resonator: Diameter of the anode -1,64 mm; Diameter of the cathode -1,07 mm; Number of resonators -22. In a nominal mode (U, = 15kV ) the density of the cathode current makes -196 A/cm2 . Reduction of density of the cathode current in 2 times at preservation constant U , and U, /us is achieved in CM at parameters of space of interaction: Diameter of the anode -2,8 mm; Diameter of th...
Recently, at least, domestic developers give obvious preference coaxial magnetron. This aspiration is quite clear, though and not always justified. Many coaxial magnetrons (CM) both on separate parameters and on their set objectively surpass magnetron with anode straps and magnetron with the rising-sun resonator. Suppression in CM of mode competing at a level of the best type's classical magnetron with straps is realized much easier. Involves also an opportunity of application slow-wave circuit of the anodes (SWCA) with rather significant amount (more than 40) the resonators, necessity of reduction of the radial sizes of interaction space removing to a certain extent at reduction of a wave length or (and) the anode voltage.The comparative settlement estimation of a level of own losses dissipation not IT -mode 2-mm wave range magnetron [ 13 and the possible alternative variant, carried out on a technique [2], shows an opportunity of substantial growth of efficiency in the last.Modem CMs are created on a wave A =8 mm and in short-wave area it is considered one of the basic obstacles of promotion low stability of the form and thermo stability the gas station owing to restriction of thickness of her cylindrical wall in size (0,05 . . . 0,07) A. Sufficient stability of the form and thermostability it is possible to reach by application of the SWCA from molybdenum with a copper covering of an external surface of the anode block, that with other things being equal will result in increase in losses in the SWCA in 1,68 times. However, loss in the SWCA thus in -1, 5 times it is less in comparison with variant not IT -mode magnetron. More a serious obstacle at creation of short-wave CM is the problem of the organization of a necessary level of coupling of the SWCA with the stabilizing resonator (SR), generated in the small azimuthally extent of a peripheral wall of the SWCA. For the SWCA of a 2-mm wave range CM she does not exceed 0, 15 mm, and the minimal width of a coupling slot of the SWCA with SR at her manufacturing an electrode without a structure there are in area of 0, 1 mm. But the basic obstacle of promotion of CM in a short-wave part of a millimetric range of lengths of waves becomes growing difficulty of frequency control of generation. The aspiration to unload results the cathode in significant radial sizes SR owing to what dependence of own frequency of working kind SR on his axial size becomes extremely big and results practically in loss of frequency control of generation. We shall illustrate it by the example of attempt of creation of analogue magnetron RPB-8 (A 4, 3 mm) [3] with the parameters of space of interaction rising-sun resonator: Diameter of the anode -1,64 mm; Diameter of the cathode -1,07 mm; Number of resonators -22. In a nominal mode (U, = 15kV ) the density of the cathode current makes -196 A/cm2 . Reduction of density of the cathode current in 2 times at preservation constant U , and U, /us is achieved in CM at parameters of space of interaction: Diameter of the anode -2,8 mm; Diameter of th...
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