Journal
IEEE ELECTRON DEVICE LETTERS
Volume 44, Issue 11, Pages 1892-1894Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2023.3317935
Keywords
Magnetic tunneling; Saturation magnetization; Magnetic separation; Focusing; Magnetic flux density; Electron beams; Periodic structures; Beam transmission; C-magnet; transverse magnetic field; PPM focusing; traveling wave tube
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This letter investigates the influence of the asymmetric C-magnet on the beam transmission of a travelling wave tube (TWT) and proposes a magnetic pole piece with an arc slot to effectively reduce the transverse magnetic field. Experimental results show that this magnetic structure improves the performance of TWTs.
The asymmetric C-magnet connecting the signal transmission structure of the travelling wave tube (TWT) influences the beam transmission since it produces a transverse magnetic field. In this letter, the transverse field of the C-magnet is simulated by CST, and a pole piece with an arc slot is proposed, which effectively reduces the transverse field by introducing magnetic resistance on the opposite side of the C-shaped opening. It was confirmed in an E-band continuous wave (CW) TWT, the beam transmission was improved and the interception power was reduced by 22%. This magnetic structure provides a technical solution for improving the performance of TWTs with C-magnets.
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