论文标题
干扰观察者应用LANSCE DTL LINAC固态功率放大器的相位漂移补偿的应用
Disturbance Observer Application for the Compensation of the Phase Drift of the LANSCE DTL LINAC Solid State Power Amplifier
论文作者
论文摘要
Los Alamos中子科学中心（LANSCE）线性加速器的前端使用四个201.25-MHz漂移管Linac（DTL），将H+和H梁加速至100 MeV。 201.25-MHz DTL中有三个由Gucrodes供电，第一个DTL由四极管供电。 20 kW的固态功率放大器（SSPA）用于向四极管提供约15 kW的驱动力。 SSPA是水冷的，由24个推杆LDMOS晶体管组成，其功率饱和能力的45％，提供了足够的功率净空和出色的线性性。但是，SSPA的相位在+/- 20度下在几十分钟内被扰动，部分原因是气冷SSPA驱动器循环器的温度相关相位变化引起的。该相变的消耗了空腔场反馈控制器的大部分相控制范围。为了减轻SSPA相位变化对腔场的影响，在空腔场控制FPGA上设计和实现了干扰观察者控制器（DOBC），该FPGA与空腔场反馈控制器并行起作用。在本文中，解决了DOBC的设计及其功能以及其短期和长期绩效。
The front end of Los Alamos Neutron Science Center (LANSCE) linear accelerator uses four 201.25-MHz Drift-Tube Linacs (DTLs) to accelerate the H+ and H- beams to 100 MeV. Three of the 201.25-MHz DTLs are powered by diacrodes and the first DTL is powered by a tetrode. A 20-kW solid-state power amplifier (SSPA) is used to provide ~15 kW drive power to the tetrode. The SSPA is water-cooled and consists of 24 push-pull LDMOS transistors operating at 45% of their power saturation capability, providing ample power headroom and excellent linearity. However, the phase of the SSPA is perturbed at +/-20 degrees over a few ten minutes partially caused by the temperature dependent phase variation of the air-cooled SSPA driver circulator. This phase variation consumes most of the phase control margin of the cavity field feedback controller. In order to mitigate the effect of the SSPA phase variation on the cavity field, a disturbance observer controller (DOBC) has been designed and implemented on the cavity field control FPGA, which functions in parallel with the cavity field feedback controller. In this paper, the DOBC design and its function as well as its short- and long-term performance are addressed.
