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• W2092808575 abstract "Abstract A stream of electrons has been focused solely by the fields of a slow (0p⁢c) electromagnetic wave An analysis was obtained by transforming to the wave frame in which the equations of motion of electrostatic periodic focusing are valid. Using the well-known results for the static case, and retransforming to the laboratory frame, focusing behaviour and design information (circuit size, frequency, power for a given stream) wore obtained. A second but more appropriate analysis was made by transforming to the average electron frame in order to predict both fast and slow-wave results; for the axially symmetric modes considered, the slow-wave focusing requires orders of magnitude less power than for fast waves and has a more favourable field shape Several experiments were performed using a helix as the slow waveguide. The stream was launched into the helix and was collected both on the helix and by a collector at the opposite end. Typically 10 to 50% of the current would be transmitted with no wave, rising linearly with wave power to a best transmission of over 80%. The best results were obtained with the wave velocity in the same direction and greater than the average velocity of the stream; use of oppositely directed wave and stream velocities gave poorest results. At best, a I vv stream (roughly I mA at 1000 v) was focused by about 10 w of r.f. wave power at 1000 Mc. These results are in rough agreement with the theory. For a given injected stream there appears to be a maximum r.f. power beyond which focusing decreases; this effect may be due to either a strong localized lens effect at the point of stream injection or to r.f. voltages largo compared with the average steam voltage." @default.
• W2092808575 created "2016-06-24" @default.
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• W2092808575 date "1964-12-01" @default.
• W2092808575 modified "2023-09-26" @default.
• W2092808575 title "Focusing of an Electron Stream with Radio-frequency Fields†" @default.
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• W2092808575 doi "https://doi.org/10.1080/00207216408937732" @default.
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