In double layer jackets, the inner layer is manufactured from achromatic SPVC.

在双层护套中，内层是由消色SPVC合成。

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A double focusing, non spatial dispersion magnet design has been suggested to substitute the achromatic principle for improving the beam characteristics on target of the medical accelerator.

本文提出以双聚焦、无空间色散的设计原则，来代替常用的全消色差设计原则，使医用电子直线加速器的偏转磁铁能够具有更好的特性。

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