Three-dimensional particle-in-cell simulations of 300 GHz reflex klystrons
- Korea Electrotechnology Research Institute (KERI), 28-1, Sung-Ju Dong, Changwon, Gyungnam 641-120 (Korea, Republic of)
Three-dimensional (3D) particle-in-cell simulations of 300 GHz reflex klystrons are presented. 300 GHz electromagnetic wave generation in a resonant cavity is analyzed by using a 3D simulation model in which all the geometric parameters (such as the grid thickness, repeller shape, beam radius, etc.) are described. When an electron beam of an energy of 1.0 keV and a net current of 8.9 mA is used, the maximum electronic efficiency of energy transfer is observed when the gap transit angle is 0.7{pi} rad, and the efficiency saturates when the beam current is over 10 mA. Space charge forces produce a shift in the optimum repeller voltage. It is also shown that the effect of the beam temperature is not critical, even though the bunching wavelength of the electron beam is several times smaller than that in conventional vacuum electron devices. Our simulation results show that a microfabricated 300 GHz reflex klystron can directly generate electromagnetic waves with output power levels of several tens of milliwatts.
- OSTI ID:
- 20982736
- Journal Information:
- Journal of Applied Physics, Vol. 101, Issue 5; Other Information: DOI: 10.1063/1.2710353; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
43 PARTICLE ACCELERATORS
BEAM CURRENTS
CAVITY RESONATORS
COMPUTERIZED SIMULATION
ELECTRIC POTENTIAL
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ENERGY TRANSFER
GHZ RANGE 100-1000
KLYSTRONS
MATHEMATICAL MODELS
SPACE CHARGE
THREE-DIMENSIONAL CALCULATIONS
WAVELENGTHS