By simulating the ion beam envelope, a beam optics design of intense neutron generator for cancer therapy is given.

通过强流离子束包络的数值模拟计算，完成了用于治疗癌症的强中子发生器的束流传输系统设计。

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The ion beam optics of a microwave ion gun for a focused ion beam (FIB) system is investigated numerically in this article.

用数值模拟方法研究了聚焦离子束系统中微波离子枪的束光学性能。

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But turning this push into a pull required more sophisticated optics -in Grier's case, a solenoid beam.

但是将这种推力转化为一种拉力需要更加复杂的光学，比如，在格里尔的设计中，是通过一种螺线管状光束。

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Solenoid beams have already proven their "tractor beam" abilities in laboratory tests published in the journal Optics Express, but the pulling power of Bessel beams, presented on the preprint server Arxiv in February, remains to be proved experimentally.

BBC: Nasa examines 'tractor beams' for sample gathering