TJ-II neutral beam injectors control and data acquisition system

The Control and Data Acquisition System for the Neutral Beam Injectors of TJ-II are described in this paper. The DAQ and Control architecture is based on a distributed system including VME-OS9 real-time computers and personal computers (PCs) with Linux and Windows NT. One OS9-VME local computer located near each injector performs the timing, local signal processing, signal interlock, and operation of the injector mechanical and electrical components. A main OS9-VME interfaces and controls some peripheral systems, such as the high voltage power supplies, water cooling, safety and protection systems. Control is performed from the OS9-VME machines, in which the software elements are basically C/C++ programs performing real time processing and a web server enabling access to the HTML pages acting as user graphic interface.