The Timing System of the Neutral Beam Injector on EAST

• Published in: Plasma science & technology 2015-05, Vol.17 (5), p.425-429
• Main Author: 盛鹏 胡纯栋 赵远哲 崔庆龙 张小丹 吴德云 张睿 林宇莲 NBi team
• Format: Article
• Language: English
• Subjects: Clocks; Control systems; EAST; Feedback control; Injectors; LabVIEW; neutral beam injector; Neutral beams; Pulse width; Terminals; Time measurements; timing sequence; timing system; 中性束注入; 定时系统; 控制电源; 控制终端; 数据采集系统; 计时系统
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/17/5/10

In order to synchronize the elements of the EAST Neutral Beam Injector （NBI） spatially located in several places, a distributed Timing System （TS） is developed in this paper. The timing system provides a clock reference for synchronization and an interlock protection of the EAST NBI system. It sends timing signals to field devices, controls the pulse widths of the timing sequences, and provides a sampling clock for the Data Acquisition System （DAS）. The timing system also generates analog waveforms to control power supplies and gas supplies according to the operator＇s configuration. The timing system is developed on a PXI （PCI eXtensions for Instrumentation） platform consisting of a LabVIEW workstation and a timing control terminal. The timing control terminal consists of a timing node and several control interface crates. Two timing nodes are configured in one beam line. Each node is responsible for the timing sequence, analog generation and feedback control for one ion source. The architecture and implementation of the timing system are presented in this paper.