Integration of the state observer RAPTOR in the real-time MARTe framework at RFX-mod

Piron, C.; Manduchi, G.; Bettini, Paolo; Felici, F.; Finotti, Claudio; Franz, P.; Kudláček, O.; Marchiori, G.; Marrelli, L.; Moret, J.M.; Piovesan, P.; Sauter, O.; Taliercio, C.

doi:10.1016/j.fusengdes.2017.02.093

Cited by 7 publications

(9 citation statements)

References 13 publications

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“…The Nitrogen concentration is deduced from a prescribed Z ef f profile, and the Tungsten density is taken proportional to that of electrons, with a concentration assumed to be low enough not to contribute to electroneutrality. The Porcelli sawtooth model [43] implemented in RAPTOR is used to prevent the safety factor to go far below unity as plasma current diffuses [44]. This plays an important role here due to the contribution of core ohmic current in the mechanism at play.…”

Section: Integrated Modellingmentioning

confidence: 99%

Healing plasma current ramp-up by nitrogen seeding in the full tungsten environment of WEST

Maget¹,

Manas²,

Artaud³

et al. 2022

Plasma Phys. Control. Fusion

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Achieving a successful plasma current ramp-up in a full Tungsten tokamak can be challenging due to the large core radiation (and resulting low core temperature) that can be faced with this heavy metallic impurity if its relative concentration is too high. Nitrogen injection during the plasma current ramp-up of WEST discharges greatly improves core temperature and Magneto-Hydro-Dynamic stability. Experimental measurements and integrated simulations with the RAPTOR code complemented with the Qualikiz Neural Network for computing turbulent transport allow a detailed understanding of the mechanisms at play. Increased edge radiation during this transient phase is shown to improve conﬁnement properties, driving higher core temperature and better MHD stability. This also leads to increased operation margins with respect to Tungsten contamination.

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Section: Integrated Modellingmentioning

confidence: 99%

Healing plasma current ramp-up by nitrogen seeding in the full tungsten environment of WEST

Maget¹,

Manas²,

Artaud³

et al. 2022

Plasma Phys. Control. Fusion

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“…In [57] it was shown that the CDE coupled to the equilibrium solution is able to reproduce the measured q-profile evolution associated to a sawtooth crash, when sawtooth-induced current relaxation is accounted for by reconnection models [58], and the fast ions contribution is correctly modeled. These reconnection models are already implemented in RAPTOR [59] but were not used in this paper .…”

Section: Limitations Of Current Approach and Outlooksmentioning

confidence: 99%

First demonstration of real-time kinetic equilibrium reconstruction on TCV by coupling LIUQE and RAPTOR

et al. 2020

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Kinetic Equilibrium Reconstruction (KER) in tokamaks is the solution of the free-boundary MHD equilibrium that best fits the external magnetic measurements and the internal plasma profiles as imposed from modeling and/or available internal measurements. In this paper, for the first time, the KER has been performed in real-time by coupling the free-boundary equilibrium code LIUQE to the 1.5D transport code RAPTOR, during a TCV discharge. The transport code is used as a dynamic state observer evolving the current diffusion equation, the electron heat and particle diffusion equations and correcting the prediction with the measurements available in real-time, making use of the Extended Kalman Filter (EKF) method. The simple coupling strategy, based on a matching of the free functions (p and T T) on the right-hand-side of the Grad Shafranov equation, is shown to be effective in providing consistency of pressure and current density profiles between the two codes. We also show that, despite this highly non-linear system, this technique does not require significant additional computational time with respect to the running times of the two independent codes and does not require a tight coupling of the two codes allowing therefore their independent development. The KER is compared to standard real-time equilibrium reconstruction, performed routinely in TCV, where only the external magnetic measurements are taken into account. The following cases are considered: flat central ne, current density broadening due to applied electron cyclotron current drive and neoclassical tearing mode causing a temperature drop. The KER reproduces the expected changes of the internal profiles, tracking their dynamic evolution in their physical timescales.

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“…The Scientific Linux 6.7 was selected as OS, since it is supported by JET CODAS, making the compatibility with other installed systems, forcing the Linux Device Driver upgrade to the new kernel version. For the CDAQ software, MARTe framework was selected because: (i) it fulfills all the diagnostics requirements; (ii) it is used in other JET diagnostics; (iii) it is popular in the fusion community by its usage in several machines, which contributes for its continuous development [ [19]- [25]]. Fig.…”

Section: Cdaq System Uniformizationmentioning

confidence: 99%

Control and data acquisition software upgrade for JET gamma-ray diagnostics

Santos

Fernandes

Pereira

et al. 2018

Fusion Engineering and Design

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Integration of the state observer RAPTOR in the real-time MARTe framework at RFX-mod

Cited by 7 publications

References 13 publications

Healing plasma current ramp-up by nitrogen seeding in the full tungsten environment of WEST

Healing plasma current ramp-up by nitrogen seeding in the full tungsten environment of WEST

First demonstration of real-time kinetic equilibrium reconstruction on TCV by coupling LIUQE and RAPTOR

Control and data acquisition software upgrade for JET gamma-ray diagnostics

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