Development of Next-Generation LLRF Control System for J-PARC Rapid Cycling Synchrotron
Development of Next-Generation LLRF Control System for J-PARC Rapid Cycling Synchrotron
复制标题
J-PARC 快速循环同步加速器下一代 LLRF 控制系统的开发
DOI：
10.1109/tns.2019.2899358
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发表时间：
2018
影响因子：
1.8
通讯作者：
M. Ryoshi
中科院分区：
文献类型：
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作者：
F. Tamura;Y. Sugiyama;M. Yoshii;M. Ryoshi
日本质子加速器研究综合体快速循环同步加速器的低水平射频（LLRF）控制系统于2007年开始运行。LLRF控制系统的关键功能是双谐波自动电压控制和多谐波RF前馈，双谐波自动电压控制在单个宽带磁合金（MA）腔中产生基波加速谐波和二次谐波的叠加电压，多谐波RF前馈补偿高强度束流对MA腔的束流负载。这些功能是加速高强度质子束所必需的。十多年来，该系统一直运行良好，没有出现重大问题。然而，旧的现场可编程门阵列（Xilinx Virtex-II pro和其他）已经停产，并且不受当前开发环境的支持。在不久的将来很难维持这一系统。因此，我们计划用新的基于MicroTCA. 4的系统取代现有的基于Versa Module Europa（VME）的LLRF控制系统。该系统独立控制12个腔，并真实的计算腔电压的矢量和以进行相位反馈。模块间的信号和数据传输是实现功能的关键。在现有系统中，传输不仅使用背板，而且还通过VME模块之间的电缆进行串行链路。得益于MicroTCA.4背板的高速通信能力，新系统中的操作更加简化。在本文中，我们描述了正在开发的系统的配置，实现的功能，和初步的测试结果。
The low-level RF (LLRF) control system for the rapid cycling synchrotron of the Japan Proton Accelerator Research Complex started its operation in 2007. The key functions of the LLRF control system are the dual-harmonic auto voltage control, which generates the superposed voltages of the fundamental accelerating harmonic and the second harmonic in a single wideband magnetic alloy (MA) cavity, and the multiharmonic RF feedforward to compensate the beam loading in the MA cavity caused by high-intensity beams. These functions are necessary to accelerate high-intensity proton beams. The system has been working well without major problems for more than ten years. However, the old field-programmable gate arrays (Xilinx Virtex-II pro and others) are discontinued and not supported by the current development environment. It will be difficult to maintain the system in a near future. Thus, we are planning to replace the existing Versa Module Europa (VME)-based LLRF control system with a new MicroTCA.4-based system. The system controls 12 cavities independently and calculates the vector sum of the cavity voltages in real time for phase feedback. Signal and data transfer between the modules is a key to realize the functions. In the existing system, the transfer is implemented not only using the backplane but also serial link via cables between the VME modules. It is much more simplified in the new system thanks to the high-speed communication capability of the MicroTCA.4 backplane. In this paper, we describe the configuration of the system under development, the implemented functions, and the preliminary test results.
使用 J-PARC MLF 中子源进行惰性中微子搜索
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