Real-time measurement and control at JET experiment control

Felton, R.; Joffrin, E.; Murari, A.; Zabeo, L.; Sartori, F.; Piccolo, F.; Farthing, J.; Budd, T.; Dorling, S.; McCullen, P.; Harling, J.; Dalley, S.; Goodyear, A.; Stephen, A.; Card, P.; Bright, M.; Lucock, R.; Jones, Edward C.; Griph, S.; Hogben, C.; Beldishevski, M.; Buckley, Margaret; Davis, J.; Young, I.; Hemming, O.; Wheatley, M.; Heesterman, P.; Lloyd, G. Kenneth; Walters, Mark C.; Bridge, Ronald; Leggate, H.; Howell, D. F.; Zastrow, K.‐D.; Giroud, C.; Coffey, I.; Hawkes, N.; Stamp, M.; Barnsley, R.; Edlington, T.; Guenther, Karl H.; Gowers, C.; Popovichef, S.; Huber, A.; Ingesson, C.; Mazon, D.; Moreau, D.; Alves, D.; Sousa, J.; Riva, M.; Barana, O.; Bolzonella, T.; Valisa, M.; Innocente, P.; Zerbini, M.; Bosak, K.; Blum, Jacques; Vitale, E.; Crisanti, F.; Luna, E. de la; Sánchez, J.

doi:10.1016/j.fusengdes.2005.06.286

Cited by 28 publications

(15 citation statements)

References 6 publications

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“…Real-time equilibrium reconstructions codes (e.g. RT-EFIT [32] or EQUINOX [33]) exist and most tokamaks have multiple real-time diagnostics available [34], [35]. The extra computational effort required to include time-varying flux surface shapes is non-negligible, but will be offset by the longer time scales of larger devices, making the implementation viable.…”

Section: Real-time Simulation On Iter and Other Tokamaksmentioning

confidence: 99%

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Real-time physics-model-based simulation of the current density profile in tokamak plasmas

et al. 2011

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Abstract.A new paradigm is presented to reconstruct the plasma current density profile in a tokamak in real-time. The traditional method of basing the reconstruction on real-time diagnostics combined with a real-time GradShafranov solver suffers from the difficulty of obtaining reliable internal current profile measurements with sufficient spatial and temporal accuracy to have a complete picture of the profile evolution at all times. A new methodology is proposed in which the plasma current density profile is simulated in real-time by solving the first-principle physics-based equations determining its evolution. Effectively, an interpretative transport simulation similar to those run today in post-plasma shot analysis is performed in real-time. This provides realtime reconstructions of the current density profile with spatial and temporal resolution constrained only by the capabilities of the computational platform used and not by the available diagnostics or the choice of basis functions. The diagnostic measurements available in real-time are used to constrain and improve the accuracy of the simulated profiles. Estimates of other plasma quantities, related to the current density profile, become available in real-time as well. The implementation of the proposed paradigm in the TCV tokamak is discussed, and its successful use in plasma experiments is demonstrated. This framework opens up the possibility of unifying q profile reconstructions across different tokamaks using a common physics model and will support a wealth of applications in which improved real-time knowledge of the plasma state is used for feedback control, disruption avoidance, scenario monitoring, and external disturbance estimation.

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Section: Real-time Simulation On Iter and Other Tokamaksmentioning

confidence: 99%

“…For example, the case of the rotational transform ι(ρ) = 1/(2πB 0 ρ)∂ψ/∂ρ. Defining the matrix, which can be precalculated, 34) where [x 1 , . .…”

Section: Appendix A4 Calculating Simulation Outputs By Matrix Multimentioning

confidence: 99%

Real-time physics-model-based simulation of the current density profile in tokamak plasmas

et al. 2011

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“…The former provides direct measurements of plasma parameters while the latter indirect measurements by performing real-time analysis on the direct measurements. Both types of systems are potential real-time data sources for driving control systems with either protective or experimental intents [9].…”

Section: The Jet's Real-time Infrastructurementioning

confidence: 99%

A New Generation of Real-Time Systems in the JET Tokamak

Alves¹,

Neto²,

Valcárcel³

et al. 2014

IEEE Trans. Nucl. Sci.

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Abstract-Recently a new recipe for developing and deploying real-time systems has become increasingly adopted in the JET tokamak. Powered by the advent of x86 multi-core technology and the reliability of the JET's well established Real-Time Data Network (RTDN) to handle all real-time I/O, an official Linux vanilla kernel has been demonstrated to be able to provide realtime performance to user-space applications that are required to meet stringent timing constraints. In particular, a careful rearrangement of the Interrupt ReQuests' (IRQs) affinities together with the kernel's CPU isolation mechanism allows to obtain either soft or hard real-time behavior depending on the synchronization mechanism adopted. Finally, the Multithreaded Application Real-Time executor (MARTe) framework is used for building applications particularly optimised for exploring multicore architectures. In the past year, four new systems based on this philosophy have been installed and are now part of the JET's routine operation. The focus of the present work is on the configuration and interconnection of the ingredients that enable these new systems' real-time capability and on the impact that JET's distributed real-time architecture has on system engineering requirements, such as algorithm testing and plant commissioning. Details are given about the common real-time configuration and development path of these systems, followed by a brief description of each system together with results regarding their real-time performance. A cycle time jitter analysis of a user-space MARTe based application synchronising over a network is also presented. The goal is to compare its deterministic performance while running on a vanilla and on a Messaging Real time Grid (MRG) Linux kernel.

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“…From a point of view of diagnostics developments, for many years JET diagnostics have been upgraded in order to provide adequate support for the scientific exploitation of a D-T campaign [1,2,3], with particular attention to the issues posed by the neutron yield and the new wall materials [4]. The main efforts have concentrated on improving three main aspects of JET measuring capability: 1) the quality of the measurements of the electron and ion fluids to support the plasma physics programme 2) the diagnostic for the fusion products 3) diagnostic technologies for ITER.…”

Section: Introductionmentioning

confidence: 99%

JET diagnostic enhancements in preparation for DT operations

Figueiredo¹,

Murari

Thun

et al. 2016

Review of Scientific Instruments

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In order to complete the exploitation of the JET ITER-like Wall and to take full benefit from deuterium-tritium experiments on JET, a set of diagnostic system refurbishments or upgrades is in progress. These diagnostic enhancements focus mainly on neutron, gamma, fast ions, instabilities and operations support. This effort intends to provide better spatial, temporal and energy resolution while increasing measurement coverage. But also previously non existing capabilities, such as Doppler Reflectometry, will now be made available for scientific exploitation. Guaranteeing diagnostic reliability and consistency during the expected DT conditions is also a critical condition for the work and systems being implemented. An overview of status and scope of the ongoing projects is presented.

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Real-time measurement and control at JET experiment control

Cited by 28 publications

References 6 publications

Real-time physics-model-based simulation of the current density profile in tokamak plasmas

Real-time physics-model-based simulation of the current density profile in tokamak plasmas

A New Generation of Real-Time Systems in the JET Tokamak

JET diagnostic enhancements in preparation for DT operations

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