The Evolution of Cone-Like Formations on The Cathode of Abnormal Glow Discharge of Ar

Bobkov, V. V.; Alimov, S. S.; Andreiev, V. V.; Slyusarenko, Yu. V.; Starovoitov, R. I.

doi:10.1063/1.1593937

Cited by 2 publications

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“…The characterization and prediction of the non-axisymmetric boundary deformation is important because such 3D geometry can influence the ELM stability [15], turbulent transport [16] and the coupling of the ion cyclotron resonance heating (ICRH) [17]. The 3D boundary distortion from external MPs has been extensively studied in various machines like ASDEX Upgrade [18,19], DIII-D [20,7,12], MAST [21], JET [22,23] and has been reviewed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations

et al. 2017

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Abstract.In low-collisionality (ν ) scenarios exhibiting mitigation of edge localized modes (ELMs), stable ideal kink modes at the edge are excited by externally applied magnetic perturbation (MP)-fields. At ASDEX Upgrade these modes can cause three-dimensional (3D) boundary displacements up to the centimeter range. These displacements have been measured using toroidally localized high resolution diagnostics and rigidly rotating n = 2 MP-fields with various applied poloidal mode spectra. These measurements are compared to non-linear 3D ideal magnetohydrodynamics (MHD) equilibria calculated by VMEC. Comprehensive comparisons have been conducted, which consider for instance plasma movements due to the position control system, attenuation due to internal conductors and changes in the edge pressure profiles.VMEC accurately reproduces the amplitude of the displacement and its dependencies on the applied poloidal mode spectra. Quantitative agreement is found around the low field side (LFS) midplane. The response at the plasma top is qualitatively compared. The measured and predicted displacements at the plasma top maximize when the applied spectra is optimized for ELM-mitigation. The predictions from the vacuum modeling generally fails to describe the displacement at the LFS midplane as well as at the plasma top. When the applied mode spectra is set to maximize the displacement, VMEC and the measurements clearly surpass the ‡ matthias.willensdorfer@ipp.mpg.de arXiv:1702.03177v2 [physics.plasm-ph] 24 Jul 2017 3D boundary displacement due to stable ideal kink modes excited by external n=2 MPs 2 predictions from the vacuum modeling by a factor of four. Minor disagreements between VMEC and the measurements are discussed. This study underlines the importance of the stable ideal kink modes at the edge for the 3D boundary displacement in scenarios relevant for ELM-mitigation.

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Section: Introductionmentioning

confidence: 99%

Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations

et al. 2017

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“…Both experiments and simulations in AUG [5,6,[14][15][16] showed tht significant increases of the effective coupling resistances were achieved by moving the gas source EPJ Web of Conferences 157, 02013 (2017) DOI: 10.1051/epjconf/201715702013 22 Topical Conference on Radio-Frequency Power in Plasmas from the divertor to the main chamber. The core plasma propertites were kept close to identical during different gas puffing schemes.…”

Section: Improvement Of Icrf Couplingmentioning

confidence: 99%

Recent progress on improving ICRF coupling and reducing RF-specific impurities in ASDEX Upgrade

et al. 2017

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Abstract. The recent scientific research on ASDEX Upgrade (AUG) has greatly advanced solutions to two issues of Radio Frequency (RF) heating in the Ion Cyclotron Range of Frequencies (ICRF): (a) the coupling of ICRF power to the plasma is significantly improved by density tailoring with local gas puffing; (b) the release of RF-specific impurities is significantly reduced by minimizing the RF near field with 3-strap antennas. This paper summarizes the applied methods and reviews the associated achievements.

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The Evolution of Cone-Like Formations on The Cathode of Abnormal Glow Discharge of Ar

Cited by 2 publications

References 0 publications

Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations

Three dimensional boundary displacement due to stable ideal kink modes excited by external n = 2 magnetic perturbations

Recent progress on improving ICRF coupling and reducing RF-specific impurities in ASDEX Upgrade

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