A Quid model is used to derive the space-charge-limiting current of a relativistic electron beam drifting in a rippled-wall cylindrical waveguide.It is found that an enhancement of the space-charge-liniiting current i...A Quid model is used to derive the space-charge-limiting current of a relativistic electron beam drifting in a rippled-wall cylindrical waveguide.It is found that an enhancement of the space-charge-liniiting current is found as long as optimum values of the ripple wavelength and amplitude are chosen.However,a very small ripple wavelength of the waveguide may reduce the space-charge-limiting current rapidly.The result should be of interest to the operation of backward-wave oscillators.展开更多
Microwave generation from a resonant cavity surrounding oscillating virtual cathode,which is produced by non-homogeneous electron beams,is studied experimentally.The microwave power is measured by using the crystal de...Microwave generation from a resonant cavity surrounding oscillating virtual cathode,which is produced by non-homogeneous electron beams,is studied experimentally.The microwave power is measured by using the crystal detector and frequencies are measured by using the heterodyne technique.A single microwave pulse contains two microwave signals with different frequencies,one peak power is 1.12MW at 5.03GHz and the other is 0.56MW at 5.24GHz,and their 3dB bandwidths are 18 and 25 MHz,respectively.展开更多
文摘A Quid model is used to derive the space-charge-limiting current of a relativistic electron beam drifting in a rippled-wall cylindrical waveguide.It is found that an enhancement of the space-charge-liniiting current is found as long as optimum values of the ripple wavelength and amplitude are chosen.However,a very small ripple wavelength of the waveguide may reduce the space-charge-limiting current rapidly.The result should be of interest to the operation of backward-wave oscillators.
文摘Microwave generation from a resonant cavity surrounding oscillating virtual cathode,which is produced by non-homogeneous electron beams,is studied experimentally.The microwave power is measured by using the crystal detector and frequencies are measured by using the heterodyne technique.A single microwave pulse contains two microwave signals with different frequencies,one peak power is 1.12MW at 5.03GHz and the other is 0.56MW at 5.24GHz,and their 3dB bandwidths are 18 and 25 MHz,respectively.
