Designing CODAC system for tokamaks using web technology

Abstract

Abstract The core of ITER CODAC is built around the EPICS toolkit. EPICS is very mature in accelerator community. However, there are endeavors to improve existing control system software like tango and EPICS 7 mainly driven by the needs of more a flexible system and the development of computer technology. This paper presents a new way of building a CODAC system for tokamaks using web technology instead of EPICS toolkit. The control system components are abstracted into resources. The accessing of the resources is done via standard HTTP RESTful web API. HMI is based on HTML and JavaScript in browsers. Web Socket is used to improve the efficient of event distribution. The main feature of this design is that all interfaces in the system are based on open web standards, which are interoperable among almost all kinds of server and client technology. The paper also presents a software toolkit to build this CODAC system. With it, a data acquisition system for ECEI diagnostics is built and presented.