粒子模拟中的电磁场算法
Electromagnetic field algorithms in particle-in-cell simulation
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摘要: 研究了粒子模拟中的中心差分、时偏及高品质因数时域有限差分电磁场算法，分析了相应的数值噪声机理。着重探讨了时偏及高品质因数算法对高频噪声的滤波特性，给出了这两种算法的适用范围。通过对相对论返波管的计算，将3种算法的计算结果进行了比较，进一步验证了时偏及高品质因数算法对高频数值噪声的滤波特性。Abstract: The centered-difference, time-biased and FDTD algorithms in particle-in-cell (PIC) simulation are studied and the stability conditions of these algorithms are given. The high-frequency noise filtering characters of time-biased and high quality algorithms are analysed and their application scopes are discussed. The calculated results of the three algorithms are compared for the computation of a relativistic backward wave oscillator, further verifying their filtering characters.
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Key words:
- pic simulation /
- fdtd method /
- high-frequency noise /
- relativistic particle
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