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

UN SDGs

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

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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

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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",

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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 - http://www.scopus.com/inward/record.url?scp=85088544361&partnerID=8YFLogxK

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

Abstract

Funding

Keywords

UN SDGs

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