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.

在这项工作中，展示了具有碳纳米管（CNT）场发射阴极的电子枪，用于具有层流束特征的行波管（TWT）应用。通过这样的电子枪，在-11kV的偏压下获得9.76mA的最大发射电流，电流密度高达1.24Acm ^-2。电子枪的输出电流可以达到8.08 mA，栅极拦截率小于22％。此外，实现了具有1.6 mm束隧道的Quasi-TWT，其最大集电极电流为7.52 mA，相应的透射率为93.07％。束波相互作用的模拟进一步表明，我们的CNT场电子枪能够满足TWT应用的需求。