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而较高气压时，束电子除受自身电磁场作用及库仑碰撞散射外，等离子体不稳定性使束流传输效率明显降低。
At relatively high pressure, in addition to electromagnetic field and electron's Coulomb scattering by gas molecules, plasma instability would result in decrease of propagation efficiency.
为改善康普顿背散射成象技术图象，必须提高散射粒子的检测效率。
Scattered particle detecting efficiency must be raised in order to improve the image quality of Compton scattering imaging.
在数值计算中，该方程方法只需将散射体进行剖分，而不必将剖分推至整个计算域内进行，计算效率较高。
The method can be implemented with great efficiency in numerically simulation for the reason of mesh division can be made in scattering region instead of whole computational domain.
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