论文标题
RF调制热电子枪的设计和模拟
Design and Simulation of RF Modulated Thermionic Electron Gun
论文作者
论文摘要
我们在2856 MHz技术LINAC的电子源上介绍了设计和仿真结果。该设备是RF枪和直流二极管枪的组合。设计的枪由一个热离子阴极组成，该阴极安装在TM010腔的壁上，该腔与阳极相对高的高压电势。这种电子源的使用使得可以排除从加速器电路预击的高压枪调节器和谐振器。在加速段的RF电源脉冲中，电子束脉冲的持续时间和位置可以通过剪裁RF脉冲馈电腔来调节。该论文描述了枪腔和滤波器的设计和电动力学特性，该特性允许将微波功率传递到该腔内。通过模拟研究了颗粒动力学。结果表明，枪支出口处的梁参数满足了陈述的要求。在平均粒子能量为95 keV时，梁脉冲电流为0.44 a，发射率不超过4.8 mm mrad，并且所有电子中的70％集中在72度相位范围内。
We present design and simulation results on the electron source for 2856 MHz technological electron linac. This device is a combination of an RF gun and a DC diode gun. The designed gun consists of a thermionic cathode, which is mounted on the wall of the TM010 cavity that is under negative high voltage potential relatively to an anode. The use of such an electron source makes it possible to exclude the high-voltage gun modulator and resonator for beam prebunching from the accelerator circuit. Duration and position of an electron beam pulse within a RF power supply pulse of the accelerating section can be adjusted with tailoring of RF pulse feeding the cavity. The paper describes the design and electrodynamics characteristics of the gun cavity and a filter, which allows to transfer microwave power to that cavity. The particles dynamics has been studied by simulation. It is shown that the beam parameters at the gun exit satisfy the stated requirements. At an average particle energy of 95 keV, the beam pulse current is 0.44 A, the emittance does not exceed 4.8 mm mrad, and 70% of all electrons are concentrated in the 72 deg phase range.
