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.
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。
2
Scattered particle detecting efficiency must be raised in order to improve the image quality of Compton scattering imaging.
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。
3
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.