Abstract
In this work, an electron gun with carbon nanotube (CNT) field emission cathode is demonstrated for traveling wave tube (TWT) application with laminar flow beam features. A maximum emission current of 9.76 mA at a bias of −11 kV is achieved by such electron gun, with current density up to 1.24 A cm−2. The output current of the electron gun can reach 8.08 mA, with the grid interception rate less than 22%. Furthermore, a Quasi-TWT with a beam tunnel of 1.6 mm is realized, which has a maximum collector current of 7.52 mA with the corresponding transmittance of 93.07%. The simulation of the beam-wave interaction implies further that our CNT field electron gun is able to meet the demands of TWT applications.
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