RadiaBeam has developed a novel, flexible linac for electrons and X-rays (FLEX) capable of energy variation from 2 to 9 MeV within a single RF pulse. This accelerator employs a robust traveling wave accelerating structure with a large energy and power acceptance that allows the unique features of deep energy and current variation required for novel adaptive cargo inspection techniques and Computed Tomography. Robust RF and water-cooling systems allow average beam powers up to 15 kW, upgradable to 57 kW, at 6 MeV, potentially making this accelerator useful for electron beam irradiation applications. The high peak currents of the electron beam produced by FLEX enable novel FLASH radiotherapy methods with fast dose delivery. In this paper, we present the linac design and its components, as well the results of the experimental demonstration of beam acceleration with energy variation.

RadiaBeam开发了一种新颖的，灵活的电子和X射线线性加速器（FLEX），它能够在单个RF脉冲内从2到9 MeV改变能量。该加速器采用了坚固的行波加速结构，具有大的能量和功率接受度，可以实现新颖的自适应货物检查技术和计算机断层扫描所需的深能量和电流变化的独特功能。强大的RF和水冷系统可在6 MeV的条件下使平均束功率高达15 kW，可升级至57 kW，可能使该加速器可用于电子束辐照应用。FLEX产生的电子束的高峰值电流使新型FLASH放射治疗方法能够实现快速剂量输送。在本文中，我们介绍了直线加速器的设计及其组件，