基于PXI的LLRF架构及多功能重离子线加速测试台
PXIe-based LLRF architecture and versatile test bench for heavy ion linear acceleration
摘要：
这项工作描述了一个数字LLRF系统的架构下开发的重离子加速的规范，预计未来的重离子加速器设施在西班牙韦尔瓦。设计并搭建了一个工作在80MHz CW模式下的LLRF原型测试台。核心LLRF控制已在PXIe机箱上以数字方式实现，包括用于数字信号处理的FPGA和实时控制器。该测试台由一个用作主频率基准的高质量信号发生器、一个用于基准调制和信号调理的模拟前端、一个完成电路的小型RF元件以及一个80 MHz的可调谐谐振腔组成，该谐振腔的RF幅度、相位和频率可实时控制和监控。所提出的LLRF系统主要是使用美国国家仪器公司提供的PXIe平台数字实现的，并且基于IQ调制和解调。该系统可以被配置为使用直接采样和欠采样技术，从而导致高性能和通用的RF控制系统，而不需要过多的计算资源或非常高速的采集硬件。整个系统都是在LabVIEW环境下进行编程的，这使得原型设计过程及其可重构性变得更加容易。
英文摘要：
This work describes the architecture of a digital LLRF system for heavy-ion acceleration developed under the specification of the projected future heavy-ion accelerator facility in Huelva, Spain. A prototype LLRF test bench operating at 80MHz in CW mode has been designed and built. The core LLRF control has been digitally implemented on a PXIe chassis, including an FPGA for digital signal processing and a real time controller. The test bench is completed with a good quality signal generator used as master frequency reference, an analog front end for reference modulation and signal conditioning, small RF components completing the circuit, as well as a tunable resonant cavity at 80 MHz, whose RF amplitude, phase and frequency are real-time controlled and monitored. The presented LLRF system is mainly digitally implemented using a PXIe platform provided by National Instruments, and is based on IQ modulation and demodulation. The system can be configured to use both direct sampling and undersampling techniques, resulting thus in a high performance and versatile RF control system without the need of excessive computational resources or very high speed acquisition hardware. All the system is programmed using the LabVIEW environment, which makes much easier the prototyping process and its reconfigurability.
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