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• W2181444312 abstract "Frequency conversion of microwaves from X to Ka band is observed upon their reflection from the front of an intense relativistic electron beam in two different machines. The incident X-band microwaves derive from emission of the beam itself. The resnlts are in qualitative agreement with the expected beam front velocity monitored from variable gas pressure, aad a pulse compression, associated with beam front reflection, is ohserved. duration 4-10 ns. The first few spikes are emitted during the current rise time (5-10 ns) while the total current emission duration is of the order of 20 ns. The microwave pulse is emitted through a Teflon window and transmitted to free space via a large conical horn. it is then reflected from a metallic sheet located at a variable distance from the source (O-2 m). Part of the reflected signal comes back into the synchrotrons maser waveguide when the main beam density enters the machine. A second reflection, associated with a relativistic Doppler frequency upgrading, is then expected to occur. The reflection mechanism on the electron beam is understood as an increase of the cutoff frequency of the waveguide as a function of time. The emission starts with a frequency w slightly higher than the cutoff frequency of the empty waveguide co~ (4). If the frequency in the beam frame equals co~, then the frequency in the laboratory frame is" @default.
• W2181444312 created "2016-06-24" @default.
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• W2181444312 date "1977-01-01" @default.
• W2181444312 modified "2023-09-24" @default.
• W2181444312 title "Experimental Evidence of Relativistic Doppler Frequency Conversion on a Relativistic" @default.
• W2181444312 cites W1991240017 @default.
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• W2181444312 hasPublicationYear "1977" @default.
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