ICRH for core impurity mitigation in JET-ILW

,

doi:10.1063/1.4936467

AIP Conference Proceedings

2015

DOI: 10.1063/1.4936467

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ICRH for core impurity mitigation in JET-ILW

Abstract: Abstract. Ion cyclotron resonance frequency (ICRF) heating has been an essential component in the development of high power H-mode scenarios in JET-ILW. The steps that were taken for the successful use of ICRF heating in terms of enhancing the power capabilities and optimizing the heating performance in view of core impurity mitigation in these experiments will be reviewed.

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Cited by 2 publications

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A fast tool for ICRH + NBI modelling within the EU-IM framework

Eester¹,

Lerche²,

Huynh

et al. 2021

J. Plasma Phys.

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Most if not all tokamak heating scenarios involve multiple ion populations being heated simultaneously. To allow the simulation of various aspects of physics dynamics determining the characteristics of operational scenarios in a flexible way, speedy yet sufficiently accurate models are needed, and they should be connected to each other via a ‘backbone’. Under the umbrella of EUROfusion's Integrated Modelling efforts, such a structure is provided. The present paper focuses on one physics aspect: auxiliary heating. After solving the wave equation or beam source equation, this requires solving a set of coupled Fokker–Planck equations for the various populations involved. The adopted modules – enabling accounting for the Coulomb collisional interaction of several non-Maxwellian (minority, majority and beam) populations – are discussed and a practical example of their use is provided: the JET ‘baseline’ scenario heating a minority of ${}^3\textrm {He}$ ions in a balanced D $+$ T mix heated by D and T neutral beams.

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A fast tool for ICRH + NBI modelling within the EU-IM framework

Eester¹,

Lerche²,

Huynh

et al. 2021

J. Plasma Phys.

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A systematic investigation of radiation collapse for disruption avoidance and prevention on JET tokamak

Rossi

Gelfusa

Spolladore

et al. 2023

Matter and Radiation at Extremes

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To produce fusion reactions efficiently, thermonuclear plasmas have to reach extremely high temperatures, which is incompatible with their coming into contact with material surfaces. Confinement of plasmas using magnetic fields has progressed significantly in the last years, particularly in the tokamak configuration. Unfortunately, all tokamak devices, and particularly metallic ones, are plagued by catastrophic events called disruptions. Many disruptions are preceded by anomalies in the radiation patterns, particularly in ITER-relevant scenarios. These specific forms of radiation emission either directly cause or reveal the approaching collapse of the configuration. Detecting the localization of these radiation anomalies in real time requires an innovative and specific elaboration of bolometric measurements, confirmed by visible cameras and the inversion of sophisticated tomographic algorithms. The information derived from these measurements can be interpreted in terms of local power balances, which suggest a new quantity, the radiated power divided by the plasma internal energy, to determine the criticality of the plasma state. Combined with robust indicators of the temperature profile shape, the identified anomalous radiation patterns allow determination of the sequence of macroscopic events leading to disruptions. A systematic analysis of JET campaigns at high power in deuterium, full tritium, and DT, for a total of almost 2000 discharges, proves the effectiveness of the approach. The warning times are such that, depending on the radiation anomaly and the available actuators, the control system of future devices is expected to provide enough notice to enable deployment of effective prevention and avoidance strategies.

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ICRH for core impurity mitigation in JET-ILW

Cited by 2 publications

References 10 publications

A fast tool for ICRH + NBI modelling within the EU-IM framework

A fast tool for ICRH + NBI modelling within the EU-IM framework

A systematic investigation of radiation collapse for disruption avoidance and prevention on JET tokamak

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