RF Accelerator Technology for Very High Powers

辐射加工，特别是辐射延长食品保质期的技术，是电子加速器可能的重要应用。为了使其在经济上具有吸引力，必须开发出最大能量为5 MeV，平均束流功率为500 kW的电子加速器。低频射频线性振荡器（小于300兆赫）是非常有吸引力的候选应用。在这项工作中，我们建议建立这样一个加速器的100千伏模块，具有现实的波束负载和便宜的200 Mhz。为了测试功率三极管放大器这类机器的性能。提出的技术将允许大多数1米腔用大气压气体（六氟化硫）绝缘，从而大大简化了这种加速器的设计和冷却。将开发的模块也将在真空中进行测试以进行比较，并估计真空中结构的加热。我们采用的模块化方法显著提高了加速器的容错性和整体可靠性。如果成功，高功率射频加速器的成本将显著降低，并且这些加速器的功率水平将显著提高。

Radiation processing, particularly techniques for radiation enhanced shelf life of foods, are important possible applications of electron accelerators. In order for this to become economically attractive, an electron accelerator of 5 MeV maximum energy with an average beam power of 500 kW must be developed. Low frequency RF linacs (less than 300 Mhz.) are very attractive candidates for this application. In this work, we propose to build a 100 kV module of such an accelerator with realistic beam loading and an inexpensive 200 Mhz. power triode amplifier in order to test the capabilities this class of machine. Techniques are proposed which will allow the majority of the 1 meter cavities to be insulated with atmospheric pressure gas (Sulphur Hexafluoride), resulting in significant simplifications to the design and cooling of such accelerators. The module which will be developed will also be tested in vacuum for comparison, and to estimate the heating of the structure in vacuum. The modular approach which we are using significantly increases the fault tolerance and overall reliability of the accelerator. If successful, the costs of high power RF accelerators will be significantly reduced, and the power levels of these accelerators will be significantly increased.