Abstract
The installation of international thermonuclear experimental reactor-relevant materials for the plasma facing components (PFCs) in the Joint European Torus (JET) is expected to have a strong impact on the operation and protection of the experiment. In particular, the use of all-beryllium tiles, which deteriorate at a substantially lower temperature than the formerly installed carbon fiber composite tiles, imposes strict thermal restrictions on the PFCs during operation. Prompt and precise responses are therefore required whenever anomalous temperatures are detected. The new vessel thermal map real-time application collects the temperature measurements provided by dedicated pyrometers and infrared cameras, groups them according to spatial location and probable offending heat source, and raises alarms that will trigger appropriate protective responses. In the context of the JET global scheme for the protection of the new wall, the system is required to run on a 10 ms cycle communicating with other systems through the real-time data network. In order to meet these requirements a commercial off-the-shelf solution has been adopted based on standard x86 multicore technology. Linux and the multithreaded application real-time executor (MARTe) software framework were respectively the operating system of choice and the real-time framework used to build the application. This paper presents an overview of the system with particular technical focus on the configuration of its real-time capability and the benefits of the modular development approach and advanced tools provided by the MARTe framework.
Highlights
INTRODUCTIONAs the fusion scientific community steers their efforts towards the operation of the international thermonuclear experimental reactor (ITER) tokamak, Joint European Torus (JET) aims to provide an important contribution as it will operate with similar plasma facing component (PFC) materials; in particular, demonstrating the predicted reduction of the tritium retention levels when compared with the previous carbon fiber composite (CFC)-based wall [1]
The new vessel thermal map real-time application collects the temperature measurements provided by dedicated pyrometers and infrared cameras, groups them according to spatial location and probable offending heat source, and raises alarms that will trigger appropriate protective responses
This paper presents an overview of the system with particular technical focus on the configuration of its real-time capability and the benefits of the modular development approach and advanced tools provided by the multithreaded application real-time executor (MARTe) framework
Summary
As the fusion scientific community steers their efforts towards the operation of the international thermonuclear experimental reactor (ITER) tokamak, Joint European Torus (JET) aims to provide an important contribution as it will operate with similar plasma facing component (PFC) materials; in particular, demonstrating the predicted reduction of the tritium retention levels when compared with the previous carbon fiber composite (CFC)-based wall [1]. The protection of the ITER-like wall project was launched with the aim of providing the necessary tools to ensure the integrity of the vessel during JET’s scientific campaigns. These include a set of 13 infrared (IR) cameras and 9 pyrometer diagnostics that, together with their real-time image processing systems [2], provide the temperatures of PFCs. The vessel thermal map (VTM) collects these temperature measurements, groups them according to spatial location and probable offending heat source, and raises alarms that trigger the appropriate protective responses coordinated by the real-time protection sequencer [3] (RTPS) system, see Fig. 1. (LH), radio frequency (RF) and neutral beam (NB), the plasma density local manager (PDLM) and the plasma position, and current control (PPCC) system
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