Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D

E. A. Unterberg; N. H. Brooks; T. E. Evans; M. E. Fenstermacher; D. L. Hillis; R. Maingi; S. Mordijck; R. A. Moyer; T. H. Osborne; T. W. Petrie; J. G. Watkins

doi:10.1016/j.jnucmat.2009.01.052

Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D

E. A. Unterberg
, N. H. Brooks
, T. E. Evans
, M. E. Fenstermacher
, D. L. Hillis
, R. Maingi
, S. Mordijck
, R. A. Moyer
, T. H. Osborne
, T. W. Petrie
, J. G. Watkins

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

Abstract

Resonant magnetic perturbations (RMPs) have been shown to successfully suppress edge localized modes (ELMs) in the DIII-D tokamak. A previous study of target plate conditions highlighted differences in RMP discharges between low and high electron collisionality, ν_e^*, operation in DIII-D. This paper reports on a systematic study of the electron density pump-out associated with the turn-on of the RMP over a wide range of operating conditions in DIII-D, including shapes and collisionalities similar to those anticipated in ITER. It is shown that the pump-out magnitude, Δn_e, has an upper envelope that is inversely proportional to the pedestal ν_e^*. The particle decay times, which are calculated based on global D₂ particle balances, show an increase as the pedestal ν_e^* is increased. Both results are suggestive that the underlying physics mechanism is an increase in edge particle transport and/or that wall depletion is playing a role in the pump-out magnitude.

Original language	American English
Pages (from-to)	486-489
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.052
State	Published - Jun 15 2009
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/j.jnucmat.2009.01.052

Cite this

Unterberg, E. A., Brooks, N. H., Evans, T. E., Fenstermacher, M. E., Hillis, D. L., Maingi, R., Mordijck, S., Moyer, R. A., Osborne, T. H., Petrie, T. W., & Watkins, J. G. (2009). Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D. Journal of Nuclear Materials, 390-391(1), 486-489. https://doi.org/10.1016/j.jnucmat.2009.01.052

@article{99ed13540bef463abd733ce9bc167dd5,

title = "Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D",

abstract = "Resonant magnetic perturbations (RMPs) have been shown to successfully suppress edge localized modes (ELMs) in the DIII-D tokamak. A previous study of target plate conditions highlighted differences in RMP discharges between low and high electron collisionality, νe*, operation in DIII-D. This paper reports on a systematic study of the electron density pump-out associated with the turn-on of the RMP over a wide range of operating conditions in DIII-D, including shapes and collisionalities similar to those anticipated in ITER. It is shown that the pump-out magnitude, Δne, has an upper envelope that is inversely proportional to the pedestal νe*. The particle decay times, which are calculated based on global D2 particle balances, show an increase as the pedestal νe* is increased. Both results are suggestive that the underlying physics mechanism is an increase in edge particle transport and/or that wall depletion is playing a role in the pump-out magnitude.",

author = "Unterberg, \{E. A.\} and Brooks, \{N. H.\} and Evans, \{T. E.\} and Fenstermacher, \{M. E.\} and Hillis, \{D. L.\} and R. Maingi and S. Mordijck and Moyer, \{R. A.\} and Osborne, \{T. H.\} and Petrie, \{T. W.\} and Watkins, \{J. G.\}",

year = "2009",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2009.01.052",

language = "American English",

volume = "390-391",

pages = "486--489",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

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}

Unterberg, EA, Brooks, NH, Evans, TE, Fenstermacher, ME, Hillis, DL, Maingi, R, Mordijck, S, Moyer, RA, Osborne, TH, Petrie, TW & Watkins, JG 2009, 'Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D', Journal of Nuclear Materials, vol. 390-391, no. 1, pp. 486-489. https://doi.org/10.1016/j.jnucmat.2009.01.052

TY - JOUR

T1 - Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D

AU - Unterberg, E. A.

AU - Brooks, N. H.

AU - Evans, T. E.

AU - Fenstermacher, M. E.

AU - Hillis, D. L.

AU - Maingi, R.

AU - Mordijck, S.

AU - Moyer, R. A.

AU - Osborne, T. H.

AU - Petrie, T. W.

AU - Watkins, J. G.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - Resonant magnetic perturbations (RMPs) have been shown to successfully suppress edge localized modes (ELMs) in the DIII-D tokamak. A previous study of target plate conditions highlighted differences in RMP discharges between low and high electron collisionality, νe*, operation in DIII-D. This paper reports on a systematic study of the electron density pump-out associated with the turn-on of the RMP over a wide range of operating conditions in DIII-D, including shapes and collisionalities similar to those anticipated in ITER. It is shown that the pump-out magnitude, Δne, has an upper envelope that is inversely proportional to the pedestal νe*. The particle decay times, which are calculated based on global D2 particle balances, show an increase as the pedestal νe* is increased. Both results are suggestive that the underlying physics mechanism is an increase in edge particle transport and/or that wall depletion is playing a role in the pump-out magnitude.

AB - Resonant magnetic perturbations (RMPs) have been shown to successfully suppress edge localized modes (ELMs) in the DIII-D tokamak. A previous study of target plate conditions highlighted differences in RMP discharges between low and high electron collisionality, νe*, operation in DIII-D. This paper reports on a systematic study of the electron density pump-out associated with the turn-on of the RMP over a wide range of operating conditions in DIII-D, including shapes and collisionalities similar to those anticipated in ITER. It is shown that the pump-out magnitude, Δne, has an upper envelope that is inversely proportional to the pedestal νe*. The particle decay times, which are calculated based on global D2 particle balances, show an increase as the pedestal νe* is increased. Both results are suggestive that the underlying physics mechanism is an increase in edge particle transport and/or that wall depletion is playing a role in the pump-out magnitude.

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DO - 10.1016/j.jnucmat.2009.01.052

M3 - Article

SN - 0022-3115

VL - 390-391

SP - 486

EP - 489

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1

ER -

Experimental comparison of recycling and pumping changes during resonant magnetic perturbation experiments at low and high collisionality in DIII-D

Abstract

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