Fueling of QH-mode plasmas on DIII-D with pellets and gas

L. R. Baylor; T. C. Jernigan; K. H. Burrell; S. K. Combs; E. J. Doyle; P. Gohil; C. M. Greenfield; C. J. Lasnier; W. P. West

doi:10.1016/j.jnucmat.2004.10.022

Fueling of QH-mode plasmas on DIII-D with pellets and gas

L. R. Baylor, T. C. Jernigan, K. H. Burrell, S. K. Combs, E. J. Doyle, P. Gohil, C. M. Greenfield, C. J. Lasnier, W. P. West

Fusion Energy Division

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The quiescent high confinement mode (QH-mode) discovered on DIII-D [K.H. Burrell et al. Phys. Plasmas 8 (2001) 2153; C.M. Greenfield et al. Phys. Rev. Lett. 86 (2001) 4544] has the promising features of stationary good H-mode plasma confinement with an H-mode edge, but without the periodic edge localized modes (ELMs) common in H-mode that produce a divertor pulsed heat load. Experiments have been carried out with pellet and gas fueling to determine if the QH-mode is robust to theses edge perturbations. Pellets of different sizes were injected from several different locations [L.R. Baylor, T.C. Jernigan et al. J. Nucl. Mater. 290 (2001) 398] and gas puffs were introduced to study core fueling in QH-mode plasmas. The QH-mode is generally a low density operating regime and so there is interest in developing a fueling scheme that can lead to high density to make the QH-mode attractive as a burning plasma scenario. Results indicate that the QH-mode is maintained with small perturbations in density, however large pellet perturbations and gas puffs lead to an almost instantaneous transition to ELMing H-mode.

Original language	English
Pages (from-to)	535-538
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	337-339
Issue number	1-3 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnucmat.2004.10.022
State	Published - Mar 1 2005

Funding

We gratefully acknowledge the support and assistance of the DIII-D Operations Group at General Atomics and technical support from C.R. Foust and D.T. Fehling at ORNL. Work supported by US Department of Energy under Contracts Nos. DE-AC03-99ER54463, DE-AC05-00OR22725, DE-FG03-01ER54615, and W-74-5-ENG-48.

Keywords

DIII-D
ELM
Gas injection and fueling
Pellet

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jnucmat.2004.10.022

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title = "Fueling of QH-mode plasmas on DIII-D with pellets and gas",

abstract = "The quiescent high confinement mode (QH-mode) discovered on DIII-D [K.H. Burrell et al. Phys. Plasmas 8 (2001) 2153; C.M. Greenfield et al. Phys. Rev. Lett. 86 (2001) 4544] has the promising features of stationary good H-mode plasma confinement with an H-mode edge, but without the periodic edge localized modes (ELMs) common in H-mode that produce a divertor pulsed heat load. Experiments have been carried out with pellet and gas fueling to determine if the QH-mode is robust to theses edge perturbations. Pellets of different sizes were injected from several different locations [L.R. Baylor, T.C. Jernigan et al. J. Nucl. Mater. 290 (2001) 398] and gas puffs were introduced to study core fueling in QH-mode plasmas. The QH-mode is generally a low density operating regime and so there is interest in developing a fueling scheme that can lead to high density to make the QH-mode attractive as a burning plasma scenario. Results indicate that the QH-mode is maintained with small perturbations in density, however large pellet perturbations and gas puffs lead to an almost instantaneous transition to ELMing H-mode.",

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author = "Baylor, {L. R.} and Jernigan, {T. C.} and Burrell, {K. H.} and Combs, {S. K.} and Doyle, {E. J.} and P. Gohil and Greenfield, {C. M.} and Lasnier, {C. J.} and West, {W. P.}",

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AU - Baylor, L. R.

AU - Jernigan, T. C.

AU - Burrell, K. H.

AU - Combs, S. K.

AU - Doyle, E. J.

AU - Gohil, P.

AU - Greenfield, C. M.

AU - Lasnier, C. J.

AU - West, W. P.

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AB - The quiescent high confinement mode (QH-mode) discovered on DIII-D [K.H. Burrell et al. Phys. Plasmas 8 (2001) 2153; C.M. Greenfield et al. Phys. Rev. Lett. 86 (2001) 4544] has the promising features of stationary good H-mode plasma confinement with an H-mode edge, but without the periodic edge localized modes (ELMs) common in H-mode that produce a divertor pulsed heat load. Experiments have been carried out with pellet and gas fueling to determine if the QH-mode is robust to theses edge perturbations. Pellets of different sizes were injected from several different locations [L.R. Baylor, T.C. Jernigan et al. J. Nucl. Mater. 290 (2001) 398] and gas puffs were introduced to study core fueling in QH-mode plasmas. The QH-mode is generally a low density operating regime and so there is interest in developing a fueling scheme that can lead to high density to make the QH-mode attractive as a burning plasma scenario. Results indicate that the QH-mode is maintained with small perturbations in density, however large pellet perturbations and gas puffs lead to an almost instantaneous transition to ELMing H-mode.

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Fueling of QH-mode plasmas on DIII-D with pellets and gas

Abstract

Funding

Keywords

UN SDGs

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