space charge density 中文意思是什麼
space charge density
解釋
空間電荷密度-
To make pic ( particl - in - cell ) simulations. to set up models of guns and magnetic field and simulate them in the vacuum and plasma, respectively. we found that plasma held back part of space charge effects and improved trajectory of electrons. but beam would oscillate and became instable as accretion of plasma density. by simulating again and again, we draw a conclusion magic could n ' t work when plasma density was more by far than beam electron density. at last a four - stage depressed collector was simulated
建立電子槍和聚焦系統模擬模型，分別在真空和填充等離子體條件下進行模擬。發現填充等離子體能補償部分空間電荷效應，改善電子束包絡軌跡，提高電子的流通率，但是隨著等離子體密度的增大，束電子會出現振蕩不穩定性，遺憾的是通過反復多次模擬發現本文所用粒子模擬的代表性軟體magic無法用於模擬等離子體密度遠高於束電子密度的情況。 -
The main results are as follows : 1. the propagation of an ultrashort intense pulse laser beam in low - density plasmas is investigated analytically. relativitistic pondermotive force and space - charge effects are included, and an equation describing the evolution of the laser spot size is derived
考慮有質動力與電荷分離場的平衡，推出了超短超強脈沖激光在低密度等離子體中的折射率、電子密度和電荷分離場的表達式以及激光束斑的演化方程。 -
In respect of sic devices, an analytical model of 6h - sic jfet to well match the experimental results is proposed. the radiation response of sic jfet in room temperature to 300 c is simulated with the analysis for the neutron irradiation effect such as carrier removal, mobility degradation and space charge density decrease
對sicjfet的電參數如電子濃度，遷移率，電阻率和空間電荷區密度在中子輻照下的變化進行了分析，提出了中子輻照下6h - sicjfet的器件模型，利用此模型對sicjfet在室溫和300時的輻照響應進行模擬的結果和實驗值相符。
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