By G. Mourier
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Additional info for Crossed-field Microwave Device. Principal Elements of Crossed-Field Devices
If the anode circuit impedance changes rapidly with frequency, AV will change rapidly and the tuning curve will be modified. t ν Vo V F I G . 10. Effect of AV o n t u n i n g c u r v e . J. ENHANCED B U N C H I N G BY RESTRICTED EMISSION As has been mentioned already, the beam will produce the greatest amount of electronic tuning when the available beam reactive current is of the same order of magnitude as the circuit reactive current. The anode circuit reactance is generally fixed by the physical size of the anode ele ments and is usually in the order of ohms at microwave frequencies.
Experiments show that this current may be considerably greater than the collection current under conditions of heavy loading, such as in voltage tuning. This induced current is generally not in phase with the rf voltage between vanes and may be divided into the following components: (a) The conductive component — Ig which produces the major portion 2 of the output power of a magnetron ( P 0 = Ig /G). (b) The susceptive component Ih which in combination with the sus ceptive component of the collection current causes the operating fre quency to differ from the "cold" resonant frequency of the anode circuit.
EPSZTEIN, T h e " M " C a r c i n o tron t u b e . Proc. E. (Inst. ) 43, 413 (1955). 4- O. DOEHLER, S p a c e charge effects in t r a v e l i n g w a v e t u b e s using crossed and magnetic nique, fields. Polytechnic Proc. Symposium Institute on Mod. of B r o o k l y n , Advances November, electric in Microwave 5. R . R. WARNECKE, P . GUENARD, A N D O. DOEHLER, P h e n o m e n e s f o n d a m e n t a u x les t u b e s ä o n d e s progressives. Onde 6. G. GUILBAUD A N D J. NALOT, Elect. Efficiency, 323 (1954).