Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges

G. L. Jackson; G. M. Staebler; S. L. Allen; N. H. Brooks; T. E. Evans; J. R. Ferron; A. W. Leonard; R. Maingi; T. W. Petrie; M. J. Schaffer; R. D. Wood; W. P. West; D. G. Whyte

doi:10.1016/s0022-3115(97)80110-9

Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges

G. L. Jackson
, G. M. Staebler
, S. L. Allen
, N. H. Brooks
, T. E. Evans
, J. R. Ferron
, A. W. Leonard
, R. Maingi
, T. W. Petrie
, M. J. Schaffer
, R. D. Wood
, W. P. West
, D. G. Whyte

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

2 Scopus citations

Abstract

Radiated power fractions above 90% have been achieved in DIII-D using impurity feedback control. Heat flux reductions up to a factor of 6 and confinement enhancements of 1.6 X ITER-89P L-mode scaling have been obtained with a radiated power fraction above 90%. When the outer separatrix strike point was positioned for pumping with the DIII-D cryopump, ELMing H-mode (Type III ELMs) was triggered with neon feedback injection in conjunction with a constant deuterium gas puff rate. Changes in the ELM frequency, energy confinement and central neon concentrations as a function of radiated power are presented. Observations of detached discharges with H-mode confinement similar to the ASDEX-U CDH-mode are also discussed.

Original language	English
Pages (from-to)	618-622
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	241-243
DOIs	https://doi.org/10.1016/s0022-3115(97)80110-9
State	Published - Feb 11 1997
Externally published	Yes

Funding

Work supported by U.S. Department of Energy under Contract No's. DE-AC03-89ER51114, W-7405-ENG-48 and DE-AC05-96OR22464.

Keywords

DIII-D
Poloidal divertor
Radiation energy sink

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10.1016/s0022-3115(97)80110-9

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Jackson, G. L., Staebler, G. M., Allen, S. L., Brooks, N. H., Evans, T. E., Ferron, J. R., Leonard, A. W., Maingi, R., Petrie, T. W., Schaffer, M. J., Wood, R. D., West, W. P., & Whyte, D. G. (1997). Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges. Journal of Nuclear Materials, 241-243, 618-622. https://doi.org/10.1016/s0022-3115(97)80110-9

@article{026a27d25b2349fd8594f6bcafab0950,

title = "Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges",

abstract = "Radiated power fractions above 90\% have been achieved in DIII-D using impurity feedback control. Heat flux reductions up to a factor of 6 and confinement enhancements of 1.6 X ITER-89P L-mode scaling have been obtained with a radiated power fraction above 90\%. When the outer separatrix strike point was positioned for pumping with the DIII-D cryopump, ELMing H-mode (Type III ELMs) was triggered with neon feedback injection in conjunction with a constant deuterium gas puff rate. Changes in the ELM frequency, energy confinement and central neon concentrations as a function of radiated power are presented. Observations of detached discharges with H-mode confinement similar to the ASDEX-U CDH-mode are also discussed.",

keywords = "DIII-D, Poloidal divertor, Radiation energy sink",

author = "Jackson, \{G. L.\} and Staebler, \{G. M.\} and Allen, \{S. L.\} and Brooks, \{N. H.\} and Evans, \{T. E.\} and Ferron, \{J. R.\} and Leonard, \{A. W.\} and R. Maingi and Petrie, \{T. W.\} and Schaffer, \{M. J.\} and Wood, \{R. D.\} and West, \{W. P.\} and Whyte, \{D. G.\}",

year = "1997",

month = feb,

day = "11",

doi = "10.1016/s0022-3115(97)80110-9",

language = "English",

volume = "241-243",

pages = "618--622",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

TY - JOUR

T1 - Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges

AU - Jackson, G. L.

AU - Staebler, G. M.

AU - Allen, S. L.

AU - Brooks, N. H.

AU - Evans, T. E.

AU - Ferron, J. R.

AU - Leonard, A. W.

AU - Maingi, R.

AU - Petrie, T. W.

AU - Schaffer, M. J.

AU - Wood, R. D.

AU - West, W. P.

AU - Whyte, D. G.

PY - 1997/2/11

Y1 - 1997/2/11

N2 - Radiated power fractions above 90% have been achieved in DIII-D using impurity feedback control. Heat flux reductions up to a factor of 6 and confinement enhancements of 1.6 X ITER-89P L-mode scaling have been obtained with a radiated power fraction above 90%. When the outer separatrix strike point was positioned for pumping with the DIII-D cryopump, ELMing H-mode (Type III ELMs) was triggered with neon feedback injection in conjunction with a constant deuterium gas puff rate. Changes in the ELM frequency, energy confinement and central neon concentrations as a function of radiated power are presented. Observations of detached discharges with H-mode confinement similar to the ASDEX-U CDH-mode are also discussed.

AB - Radiated power fractions above 90% have been achieved in DIII-D using impurity feedback control. Heat flux reductions up to a factor of 6 and confinement enhancements of 1.6 X ITER-89P L-mode scaling have been obtained with a radiated power fraction above 90%. When the outer separatrix strike point was positioned for pumping with the DIII-D cryopump, ELMing H-mode (Type III ELMs) was triggered with neon feedback injection in conjunction with a constant deuterium gas puff rate. Changes in the ELM frequency, energy confinement and central neon concentrations as a function of radiated power are presented. Observations of detached discharges with H-mode confinement similar to the ASDEX-U CDH-mode are also discussed.

KW - DIII-D

KW - Poloidal divertor

KW - Radiation energy sink

UR - https://www.scopus.com/pages/publications/85088544361

U2 - 10.1016/s0022-3115(97)80110-9

DO - 10.1016/s0022-3115(97)80110-9

M3 - Article

AN - SCOPUS:85088544361

SN - 0022-3115

VL - 241-243

SP - 618

EP - 622

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges

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Keywords

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