scholarly journals Bias-driven high-power microwave emission from MgO-based tunnel magnetoresistance devices

2008 ◽  
Vol 4 (10) ◽  
pp. 803-809 ◽  
Author(s):  
Alina M. Deac ◽  
Akio Fukushima ◽  
Hitoshi Kubota ◽  
Hiroki Maehara ◽  
Yoshishige Suzuki ◽  
...  
Keyword(s):  
High Power ◽  
Microwave Emission ◽  
High Power Microwave ◽  
Tunnel Magnetoresistance ◽  
Power Microwave

Design study of a multiwave Cerenkov generator for high power microwave emission

1990 ◽  
Author(s):  
D.K. Abe ◽  
A. Bromborsky ◽  
Y. Carmel ◽  
W.W. Destler ◽  
V.L. Granatstein ◽  
...  
Keyword(s):  
High Power ◽  
Microwave Emission ◽  
Design Study ◽  
High Power Microwave ◽  
Power Microwave

Effects of diode current on high power microwave generation in a vircator

2009 ◽  
Vol 75 (6) ◽  
pp. 787-798 ◽  
Author(s):  
GUOZHI LIU ◽  
WENHUA HUANG ◽  
HAO SHAO ◽  
SHI QIU ◽  
HONGJUN WANG ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Power ◽  
Inflection Point ◽  
Beam Current ◽  
Microwave Emission ◽  
High Power Microwave ◽  
Microwave Generation ◽  
Diagnosis Method ◽  
Power Microwave ◽  
Diode Current

AbstractAn experiment of a virtual cathode oscillator (vircator) built on the low impedance intense electron beam accelerator Flash II is reported. A novel spectrum diagnosis method—a circulating dispersion line—is proposed. A thin oil layer coated graphite cathode is introduced in the experiment to decrease the delay time of the explosive emission process and obtain a homogeneous electron beam emission for improving the high-power microwave (HPM) generation efficiency. The effect of diode current on HPM generation in the vircator system is discussed. The HPM pulse width has a strong connection with the diode current waveform. For most shots, corresponding to the time that microwave emission starts, there is an inflection point in the diode current pulse. Compared with the case that no microwave is generated, the diode current increases more slowly following the inflection point. HPM generation terminates when the beam current reaches the self-pinching critical current of the diode.

scholarly journals High-power microwave emission from a virtual cathode oscillator

1987 ◽  
Vol 5 (4) ◽  
pp. 675-681 ◽  
Author(s):  
H. Sze ◽  
J. Benford ◽  
W. Woo
Keyword(s):  
High Power ◽  
Virtual Cathode ◽  
Electron Flow ◽  
Microwave Frequency ◽  
Microwave Emission ◽  
Cathode Side ◽  
High Power Microwave ◽  
High Power Microwaves ◽  
Power Microwave ◽  
Diode Current

Pinched electron beams emit high power microwaves by formation of a virtual cathode. Radiation occurs simultaneously with pinching or slightly thereafter. Observations of strong electrostatic fields and the partitioning of current into reflexing and transmitting populations at the same time that microwaves are emitted indicate virtual cathode formation. Microwaves originate mainly from the virtual cathode side of the anode. A two-dimensional model for the electron flow in the presence of a virtual cathode is presented. The model allows for electron reflexing and velocity distribution spread. Solutions with strong radial flow agree closely with microwave measurements, and result in the microwave frequency scaling linearly with diode current.

High Power Microwave Generation by Double-Anode Virtual Cathode Oscillator

2019 ◽  
Vol 139 (10) ◽  
pp. 421-427
Author(s):  
Kazuki Nagao ◽  
Wataru Takatsu ◽  
Pham Van Thuan ◽  
Taichi Sugai ◽  
Weihua Jiang
Keyword(s):  
High Power ◽  
Virtual Cathode ◽  
High Power Microwave ◽  
Microwave Generation ◽  
Power Microwave
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