Observation of Filamentary Structures on the Boundary Region of the LHD Stellarator

Carralero, D.; Shoji, M.; Cal, E. de la; Pablos, J.L. de; Hidalgo, C.; Yamada, Hiroyuki

doi:10.1002/ctpp.200900063

Cited by 4 publications

(9 citation statements)

References 13 publications

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“…Waiting-time analyses from the linear device PISCES [13] and the low-temperature stellarator TJ-K [14] revealed a close coupling between coherent structures inside and outside of the generation region. A similar observation is reported for LHD [15] together with experimental evidence for a link between the waiting-time statistics and the instability drive (global β and edge pressure gradient) [16]. The detachment of blobs from coherent structures has even been visualized directly in basic plasma experiments like TJ-K [9] and the simple magnetized torus TORPEX [10], but also in fusion experiments like Alcator C-Mod [17], NSTX [18], and TEXTOR [19].…”

Section: Prediction Of the Blob Generation And Detection Ratesupporting

confidence: 69%

Towards a quantitative prediction of the blob detection rate

Fuchert

Carralero

Mänz

et al. 2016

Plasma Phys. Control. Fusion

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To estimate the particle and energy flux to the plasma facing components of a future fusion power plant, the transport carried by filaments of increased pressure, called blobs, is of critical importance. To understand this transport the rate of the filaments has to be known. The novel approach presented here allows the prediction of both the blob generation and detection rates based on background plasma parameters only. The prediction is in a good overall agreement with recent experiments in ASDEX Upgrade.

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Section: Prediction Of the Blob Generation And Detection Ratesupporting

confidence: 69%

Towards a quantitative prediction of the blob detection rate

Fuchert

Carralero

Mänz

et al. 2016

Plasma Phys. Control. Fusion

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“…The experiments presented in this paper were all performed on ASDEX Upgrade in the magnetic lower single null configuration with a magnetic field strength B t around −2.5 T. The toroidal plasma current was I p = 0.8 MA and the line edge density (i. e. the line averaged density measured by interferometer line H-5, see e.g. [20] for a detailed description of the setup)n e was about 2 • 10 19 /m 3 . These parameters were chosen to obtain comparable discharges to previous measurements of blob dynamics in ASDEX Upgrade presented in Refs.…”

Section: Methodsmentioning

confidence: 99%

“…the line averaged density measured by interferometer line H-5, see e.g. [21] for a detailed description of the setup) n e was about 2 • 10 19 m −3 . These parameters were chosen to obtain comparable discharges to previous measurements of blob dynamics in ASDEX Upgrade presented in [24][25][26].…”

Section: Methodsmentioning

confidence: 99%

“…Concerning the blob generation rate, there is no quantitative prediction from blob theory yet. There is, however, experimental evidence from basic plasma and fusion experiments [17,[19][20][21] that micro instabilities in the edge, like e. g. drift waves or interchange modes, are involved in the blob generation. These instabilities show a broad frequency band up to the MHz range.…”

Section: Introductionmentioning

confidence: 99%

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Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade

Fuchert

Birkenmeier

Carralero

et al. 2014

Plasma Phys. Control. Fusion

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Blob properties are studied in the scrape-off layer of the tokamak ASDEX Upgrade with a fast camera. The gas-puff imaging technique is used to investigate the detection rate as well as the blob size and velocity scaling. The experiments were performed in Land H-mode phases of the same discharges to study the change in blob properties after the L-H transition. In both regimes the detection rate is of the order of a few thousand blobs per second, which is compatible with the picture of blob generation by edge micro instabilities. The blob size increases in H-mode, while the radial velocity decreases slightly. The changes are, however, not indicating a drastic change in the blob dynamics in both phases. The experimentally found blob properties were compared to predictions from a novel blob model including effects due to a finite ion temperature, which should be more appropriate for the conditions in the SOL of fusion plasmas.

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“…In the last decades the fast development of digital imaging allows the observation of 2dimensional fast phenomena with a speed of up to 10 7 frames per second. Fast viewing systems are already installed in the main magnetic confinement fusion devices such as the case of Alcator C-Mod [100], NSTX tokamak [101], ASDEX -U [102], JET [103], LHD [104] and the TJ-II stellarator [105].…”

Section: Ii24 Kl8a Visible Fast Camera Systemmentioning

confidence: 99%

Frequency and plasma condition dependent spatial structure of low frequency global potential oscillations in the TJ-II stellarator

Kobayashi¹,

Losada²,

Liu³

et al. 2019

Nucl. Fusion

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y a toda la gente que me apoyó: mis amigos Eric, Patricio, Antonio González y Carlos Raúl. También Marga, Teresita, Idelsa, Isabel, etc. Gracias a Karen Velázquez por haber sido una cercana compañía en mi vida y en los momentos finales de esta tesis. Especialmente gracias una persona que es como mi hermano de sangre, Juan Carlos Arias Valdes.Pero sobre todo, gracias á miña familia, meus pais, Ramón e Pura, o meu irmau Jorge, os meus avós Manolo, Celeste, Avelino e Pura. Os meus bisavós Eudosia e José. As miñas tías Avelina, Manuela, María, meu tío Pepe e meus primos Brais e María. Meus tíos Amaro e Carmen. Gardo un espacio privilexiado para os meus amigos de sempre de Cenlle: Dani e Diego, por quenes teño un profundo amor e respecto, xa que non tuveron as mesmas oportunidades que min nin unha vida tan sinxela. Gracias a todas esas persoas que conocín xogando ó fútbol en Galicia, especialmente a Manuel Iglesias (Fleitas), así como a Marcos, Borja, Miguel Freire, Fran, Hugo García, entre outros. Gracias a Carolina Méndez, por ser unha persoa tan importante para min e por apoiarme desde o principio, habendo estado ó meu lado durante os momentos críticos.Non podo esquecerme dos meus compañeiros da Universidade de Vigo, que me acompañaron durante a Licenciatura en Física, por 5 anos. Especial recordo teño para Javi, Hugo e Miguel. Imposible sería esquecer todo o tempo que pasamos xuntos estudanto Física e apoiándonos, que acabou resultando en sendos fermosos percorridos profesionais no ámbito da física. Esta tesis tamén vai adicada a eles, así como a os meus profesores durante o pre-universitario, Margarita Aller, Alberto Viso, Jorge Casalderrei e Aurelio.Tambem para as pessoas especiais que estão agora no belo país de São Tomé e Principe.Para todos eles e outros companheiros com quem naveguei pelos mares mais bravos e dos quais extraí as mais valiosas sabedorias, este trabalho é dedicado. Moito Obrigado.

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Observation of Filamentary Structures on the Boundary Region of the LHD Stellarator

Cited by 4 publications

References 13 publications

Towards a quantitative prediction of the blob detection rate

Towards a quantitative prediction of the blob detection rate

Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade

Frequency and plasma condition dependent spatial structure of low frequency global potential oscillations in the TJ-II stellarator

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