helix shaped hollow-beam klystron

该项目的目标是设计一种在调谐腔中带有旋转场的中空束速调管，从而形成螺旋形光束。这允许更大的电流，更大的谐振器，更高的输出效率和非常有效的倍频。该项目从2012年9月1日起得到DFG的支持。第一个效率为50%、增益为49d B的10 GHz速调管的设计进展顺利。此外，还首次获得了W波段速调管的结果。这项工作是使用内部开发的粒子跟踪和细胞内粒子模拟程序进行的。该项目的继续将涉及具有更高方位角模的x频段速调管的设计，从而产生适合于超高功率(MW)的3或4个螺旋形交织波束。ATW频段，对于中等功率(约100W)，应研究具有30 GHz输入和90 GHz输出谐振器的三倍频装置。此外，空心束阴极的工作还得继续进行。

The objective of the project is the design of a hollow-beam klystron with a rotating field in themodulating resonator, such that a helix shaped beam develops. That allows for higher currents,larger resonators, a higher output efficiency and a very efficient frequency multiplication.The project is supported by the DFG since 1.9.2012. A first design of a 10GHz klystron with 50%efficiency and 49dB gain is well advanced. Also, first results for a w-band klystron were achieved.The work was performed with in-house developed codes for particle tracking and particle-in-cellsimulations.The continuation of the project shall treat the design of an x-band klystron with higher azimuthalmodes, thus creating 3 or 4 helix shaped interwoven beams suited for very high powers (MW). Atw-band and for medium power (some 100W) a frequency tripling device shall be investigated, with30GHz input and 90GHz output resonators. In addition, work on the hollow-beam cathode has to becontinued.