对“用MBN Explorer模拟晶体中超相对论电子和正电子沟道”一文的评论
Comment on 'Simulation of ultra-relativistic electrons and positrons channeling in crystals with MBN Explorer'
摘要：
晶体原子的快照模型已在蒙特卡罗程序ChaS（粒子模拟器）中实现，并已成功地用于模拟超相对论粒子沟道。该模型受到Sushko等人（J.Comp.Phys.252（2013）404-418）的批评，他们声称该模型高估了单个射弹-原子碰撞中的平均散射角。事实上，在上述出版物中找不到支持这一说法的证据。此外，快照模型和模型建议由Sushko等人。产生基本上相同的平均散射角的值。与Sushko等人的主张相反，目标电子可以被认为是固定位置的散射体，由于它们的有限质量和非零初始速度引起的校正对光射体（电子和正电子）的通道效应具有可忽略的影响。与快照模型相反，Sushko等人所偏好的模型没有考虑晶体电子对射弹的非相干散射。这就解释了为什么两个模型预测的脱鞘长度值不同。快照模型低估了退散长度的说法是没有根据的。实际上，该模型与实验数据符合得很好。
英文摘要：
The snapshot model of crystal atoms was implemented in the Monte Carlo code ChaS (Channeling Simulator) and is being successfully used for simulation of ultrarelativistic particle channeling. The model was criticized by Sushko et al. (J. Comp. Phys. 252 (2013) 404-418) who claim that it overestimates the mean scattering angle in a single projectile-atom collision. As a matter of fact, no evidence that would support this claim can be found in the mentioned publication. Moreover, the snapshot model and the model suggested by Sushko et al. yield essentially the same value of the mean scattering angle. Contrary to the claim of Sushko et al., the target electrons can be considered as fixed-position scatterer, corrections due to their finite mass and nonzero initial velocity have a negligible impact on the channeling of light projectiles (electrons and positrons). In contrast to the snapshot model, the model preferred by Sushko et al. does not take into account incoherent scattering of the projectile by crystal electrons. This explains why the two models predict different values of the dechanneling length. The claim that the snapshot model underestimates the dechanneling length is unfounded. In actual fact, this model is in good agreement with experimental data.
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