Radial and axial RF current and velocity distributions in large-signal velocity-modulated electron beams

Gilmour, Jr. A.S.

doi:10.1109/t-ed.1972.17513

Cited by 1 publication

(2 citation statements)

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“…Therefore, it is necessary to study the actual structure of the electron beam to increase the overall efficiency of the TWT. Several different techniques have been developed to measure the electron beam, including pinhole, slit and optical image measurements [3][4][5][6][7][8][9], etc, and some test systems based on different methods have been built to diagnose the electron beams [10][11][12][13][14][15]. The slit method is applicable to the axially symmetric beams by means of integral equations [4], and the optical image method is usually applicable to high power beams (acceleration voltage U > 20 kV) [9].…”

Section: Introductionmentioning

confidence: 99%

“…The slit method is applicable to the axially symmetric beams by means of integral equations [4], and the optical image method is usually applicable to high power beams (acceleration voltage U > 20 kV) [9]. However, the pinhole scan can readily and precisely determine the spatial properties of low energy electron beams with different crosssectional geometries [3,12,14].…”

Section: Introductionmentioning

confidence: 99%

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Automated pinhole-aperture diagnostic for the current profiling of TWT electron beams

Wei

Huang

Liu

et al. 2013

Meas. Sci. Technol.

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The measurement system reported here is intended for use in determining the current density distribution of electron beams from Pierce guns for use in TWTs. The system was designed to automatically scan the cross section of the electron beam and collect the high-resolution data with a Faraday cup probe mounted on a multistage manipulator using the LabVIEW program. A 0.06 mm thick molybdenum plate with a pinhole and a Faraday cup mounted as a probe assembly was employed to sample the electron beam current with 0.5 µm space resolution. The thermal analysis of the probe with pulse beam heating was discussed. A 0.45 µP electron gun with the expected minimum beam radius 0.42 mm was measured and the three-dimensional current density distribution, beam envelope and phase space were presented.

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