Multidimensional short-pulse space-charge-limited flow
作者： WS Koh , LK Ang , TJT Kwan , None
DOI: 10.1063/1.2208086
关键词: Cathode 、 Physics 、 Electron 、 Diode 、 Cathode ray 、 Planar 、 Atomic physics 、 Current density 、 Plasma 、 Space charge 、 Condensed matter physics
摘要: The two-dimensional models of the space-charge-limited (SCL) current density at short pulse limit for which electron length is comparable or smaller than transit time across gap (i.e., XCL⩽1) have been developed. In particular, scaling laws short-pulse SCL emission in a planar diode with circular emitting strip and cylindrical finite obtained verified particle-in-cell simulation. It found that enhancement (in terms long-pulse density) proportional to XCL−1 small XCL both cases. also be larger convergent flow (cathode outside) divergent inside). Multidimensional effects are important only strips size effective penetration distance (into gap) beam. Smooth transition between shor...
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