ECCD calculations in ITER by means of the quasi-optical code

Bertelli, N.; Balakin, A. A.; Westerhof, E.; Buyanova, M.

doi:10.1088/0029-5515/50/11/115008

Cited by 14 publications

(18 citation statements)

References 44 publications

(87 reference statements)

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“…However, it has been observed experimentally Harvey et al (2002); Coda et al (2003); Kirov et al (2002) that the deposition can actually be larger than expected from ECCD/ECRH modeling. This can be due to cross-field diffusion of the fast electrons density (constituting the EC current), for instance because of turbulence on the deposition location, leading to a broadening of the driven current density deposition and therefore to a reduction in the maximum driven current density Giruzzi and Fidone (1989); Giruzzi (1993); Coda et al (2006); Bertelli and Westerhof (2009) ;Bertelli et al (2010). It has also been shown that the electron density fluctuations near the plasma edge, or along the path of the RF-waves, might lead to a broadening of the current deposition as well as a fluctuating power deposition profile Tsironis et al (2009) ;Peysson et al (2011); Decker, J. et al (2012).…”

Section: Introductionmentioning

confidence: 99%

Comparison of magnetic island stabilization strategies from magneto-hydrodynamic simulations

Février

Maget

Lütjens

et al. 2017

Plasma Phys. Control. Fusion

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The degradation of plasma confinement in tokamaks by magnetic islands motivates to better understand their possible suppression using Electron Cyclotron Current Drive (ECCD) and to investigate the various strategies relevant for this purpose. In this work, we evaluate the efficiency of several control methods through nonlinear simulations of this process with the toroidal MHD code XTOR Lütjens and Luciani (2010), which has been extended to incorporate in Ohm's law a source term modeling the RF driven current resulting from the interaction of the RF waves with the plasma. A basic control system has been implemented in the code, allowing testing advanced strategies that require feedback on island position or phase. We focus in particular on the robustness of the control strategies towards the uncertainties that apply on the control and ECCD systems, such as the risk of misalignment of the current deposition or the possible inability to generate narrow current deposition.

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Section: Introductionmentioning

confidence: 99%

Comparison of magnetic island stabilization strategies from magneto-hydrodynamic simulations

Février

Maget

Lütjens

et al. 2017

Plasma Phys. Control. Fusion

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“…broadening of the EC profiles due to aberration has been found in the range between 10-20% [18]. The broadening occurs when dispersive absorption causes the damping of different wave vectors at different locations [19].…”

Section: Broadening Of the Ec Deposition Profilesmentioning

confidence: 99%

On the criteria guiding the design of the upper electron-cyclotron launcher for ITER

Poli

Angioni

Casson

et al. 2015

EPJ Web of Conferences

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Abstract. Electron cyclotron waves injected from an antenna located in the upper part of the vessel will be employed in ITER to control MHD instabilities, particularly neoclassical tearing modes (NTMs). The derivation of the NTM stabilization criteria used up to now to guide the optimization of the launcher is reviewed in this paper and their range of validity elucidated. Possible effects leading to a deterioration of the predicted performance through a broadening of the EC deposition profile are discussed. The most detrimental effect will likely be the scattering of the EC beams from density fluctuations, resulting in a beam broadening in the 100% range. The combined impact of these effects with that of beam misalignment (with respect to the targeted surface) is discussed for a time slice of the standard Q = 10 H-mode scenario.

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“…The same beam settings are used by Bertelli et al to approximate the Gaussian beam profile near the 170 GHz EC resonance. [17] The detection capabilities of a line-of-sight ECE system on a UPL are addressed in this section.…”

Section: Line-of-sight Ecementioning

confidence: 99%

ECE for NTM control on ITER

Brand

Baar

Cardozo

et al. 2012

EPJ Web of Conferences

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Abstract. Control of Neoclassical Tearing Modes (NTMs) requires an accurate and low latency detection of the mode position. For a burning H-mode ITER plasma, simulations are conducted for both ECE detected via the equatorial port plug and along the line-of-sight of the ECCD launchers. Simulated ECE is detected using synthetic radiometers, with settings chosen to meet the required accuracy. A video bandwidth of 2 kHz is used which allows for an intermediate frequency bandwidth of BIF = 400 MHz for ECE detected via the equatorial port plug. For ECE detected via the ECCD line-of-sight, an intermediate frequency bandwidth of 1.5 GHz and 1 GHz for the 2/1 and 3/2 NTM respectively suffices for accurate location detection. For both ECE systems, the latency requirements for NTM suppression are fulfilled.

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ECCD calculations in ITER by means of the quasi-optical code

Cited by 14 publications

References 44 publications

Comparison of magnetic island stabilization strategies from magneto-hydrodynamic simulations

Comparison of magnetic island stabilization strategies from magneto-hydrodynamic simulations

On the criteria guiding the design of the upper electron-cyclotron launcher for ITER

ECE for NTM control on ITER

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