To explain the fundamental work principle of AFC for Siemens accelerator linear, summarize the experience which remove breakdown of AFC system element, optimize regulative method of AFC system.

本文简述了西门子直线加速器自动频率控制系统(afc)的基本工作原理，并据此原理总结排除afc系统元器件故障的经验，优化afc系统的调整方法探索。

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Last year, the venerable two-mile-long linear accelerator, where charmed quarks were discovered, was converted into a new kind of powerful laser that will create super-brilliant X-ray pulses.

去年，久负盛名长达两英里的直线加速器(夸克在此被发现)被转化成一种新型、强大、将创建出超亮X光脉冲的激光。

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One X-ray laser already exists in an underground facility at the Stanford Linear Accelerator Laboratory, where it spans several football fields in length.

在斯坦福线性加速器实验室的一个地下设施里已经有了一个X射线激光器，它的频率频距将具有跨越数个足球场的长度。

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External beam radiation involves zapping a patient with high-dose X rays generated by a machine called a linear accelerator.

FORBES: Men, Cancer & Hope

The new machine will be attached to a linear accelerator, a device used for radiation therapy, to allow simultaneous imaging and treatment, according to Sha Chang, who will lead the team that tests it.

ECONOMIST: Modern X-ray technology

The old linear accelerator at Stanford was repurposed, turning it from the machine that co-discovered a particle known as the charm quark (thus winning its operators a Nobel prize) into a factory for making particles called B mesons.

ECONOMIST: The arrow of time