In this paper, we present the work in the implementation of a new calibration for the JET real-time polarimeter based on the complex amplitude ratio technique and a new self-validation mechanism of data. This allowed easy integration of the polarimetry measurements into the JET plasma density control (gas feedback control) and as well as machine protection systems (neutral beam injection heating safety interlocks). The new addition was used successfully during 2014 JET Campaign and is envisaged that will operate routinely from 2015 campaign onwards in any plasma condition (including ITER relevant scenarios). This mode of operation elevated the importance of the polarimetry as a diagnostic tool in the view of future fusion experiments.

Invited Article: A novel calibration method for the JET real-time far infrared polarimeter and integration of polarimetry-based line-integrated density measurements for machine protection of a fusion plant.

Trends in computing systems for large fusion experiments

The data acquisition (DAQ) and management system of the Large Helical Device (LHD), named the LABCOM system, has been in development since 1995. The recently acquired data have grown to 7 gigabytes...

Data Acquisition and Management System of LHD

The various databases and data management techniques used to configure the JET control systems are described by following the JET experiment pulse cycle of preparation, parameter setup and validation, countdown, real-time control, data collection, storage, analysis and access. Elements of the ITER-CODAC conceptual design are used to discuss where systems may be different on ITER.

Data management at jet with a look forward to iter

From use cases of the Joint European Torus towards integrated commissioning requirements of the ITER tokamak

JET - The Joint European Torus - will be a major step in the European Community's fusion program. The principal objective of the experiment is to obtain and study a plasma in conditions and dimensions approaching those needed in a thermonuclear reactor. The size and complexity of the experiment demands an integrated computerized control and data acquisition system. CODAS comprises machine monitoring and control, acquisition of plasma and machine data, data analysis and storage. It is divided into several almost self contained subsystems, each of which is controlled and serviced by a minicomputer. The various local units of each subsystem are interfaced through CAMAC. The communication between the centralized control and the subsystems is obtained through 3 communication paths, the computer communication, the timing and the interlock system. The experiment as a whole is operated from two consoles, the machine console and the experiment console. One computer with large storage capacity is foreseen for the filing of all data, for automatic data processing between two pulses and for further analysis programs.

D. Ciscato

Papers

CODAS the JET Control and Data Acquisition System

Control and data acquisition system for the JET experiment