Effect of low density H-mode operation on edge and divertor plasma parameters

R. Maingi; P. K. Mioduszewski; J. W. Cuthbertson; D. N. Hill; J. T. Hogan; C. C. Klepper; C. J. Lasnier; A. W. Leonard; M. A. Mahdavi; M. R. Wade

doi:10.1016/0022-3115(94)00492-7

Effect of low density H-mode operation on edge and divertor plasma parameters

R. Maingi, P. K. Mioduszewski, J. W. Cuthbertson, D. N. Hill, J. T. Hogan, C. C. Klepper, C. J. Lasnier, A. W. Leonard, M. A. Mahdavi, M. R. Wade

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16 Scopus citations

Abstract

We present a study of the impact of H-mode operation at low density on divertor plasma parameters on the DIII-D tokamak. The line-average density in H-mode was scanned by variation of the particle exhaust rate, using the recently installed divertor cryo-condensation pump. The maximum decrease (50%) in line-average electron density was accompanied by a factor of 2 increase in the edge electron temperature, and 10% and 20% reductions in the measured core and divertor radiated power, respectively. The measured total power to the inboard divertor target increased by a factor of 3, with the major contribution coming from a factor of 5 increase in the peak heat flux very close to the inner strike point. The measured increase in power at the inboard divertor target was approximately equal to the measured decrease in core and divertor radiation.

Original language	English
Pages (from-to)	320-324
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	220-222
DOIs	https://doi.org/10.1016/0022-3115(94)00492-7
State	Published - 1995

Funding

This work was supported by the US Department of Energy under Contract nos. DE-AC03-89ER51114, DE-AC05-85OR21400, and W-7405-ENG-48. The efforts of the DIII-D operations staff are gratefully acknowledged. The first author wishes to thank D.L. Hillis, R.A. Jong, D.K. Lee, R.A. Moyer, L.W. Owen, M.J. Schaffer, R.D. Stambaugh, J.G. Watkins and the DIII-D divertor physics group for useful discussions. The first author is funded by a US DOE Magnetic Fusion Energy Postdoctoral Fellowship, administered by Oak Ridge Associated Universities.

Funders	Funder number
US Department of Energy
Oak Ridge Associated Universities

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title = "Effect of low density H-mode operation on edge and divertor plasma parameters",

abstract = "We present a study of the impact of H-mode operation at low density on divertor plasma parameters on the DIII-D tokamak. The line-average density in H-mode was scanned by variation of the particle exhaust rate, using the recently installed divertor cryo-condensation pump. The maximum decrease (50%) in line-average electron density was accompanied by a factor of 2 increase in the edge electron temperature, and 10% and 20% reductions in the measured core and divertor radiated power, respectively. The measured total power to the inboard divertor target increased by a factor of 3, with the major contribution coming from a factor of 5 increase in the peak heat flux very close to the inner strike point. The measured increase in power at the inboard divertor target was approximately equal to the measured decrease in core and divertor radiation.",

author = "R. Maingi and Mioduszewski, {P. K.} and Cuthbertson, {J. W.} and Hill, {D. N.} and Hogan, {J. T.} and Klepper, {C. C.} and Lasnier, {C. J.} and Leonard, {A. W.} and Mahdavi, {M. A.} and Wade, {M. R.}",

year = "1995",

doi = "10.1016/0022-3115(94)00492-7",

language = "English",

volume = "220-222",

pages = "320--324",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

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TY - JOUR

T1 - Effect of low density H-mode operation on edge and divertor plasma parameters

AU - Maingi, R.

AU - Mioduszewski, P. K.

AU - Cuthbertson, J. W.

AU - Hill, D. N.

AU - Hogan, J. T.

AU - Klepper, C. C.

AU - Lasnier, C. J.

AU - Leonard, A. W.

AU - Mahdavi, M. A.

AU - Wade, M. R.

PY - 1995

Y1 - 1995

N2 - We present a study of the impact of H-mode operation at low density on divertor plasma parameters on the DIII-D tokamak. The line-average density in H-mode was scanned by variation of the particle exhaust rate, using the recently installed divertor cryo-condensation pump. The maximum decrease (50%) in line-average electron density was accompanied by a factor of 2 increase in the edge electron temperature, and 10% and 20% reductions in the measured core and divertor radiated power, respectively. The measured total power to the inboard divertor target increased by a factor of 3, with the major contribution coming from a factor of 5 increase in the peak heat flux very close to the inner strike point. The measured increase in power at the inboard divertor target was approximately equal to the measured decrease in core and divertor radiation.

AB - We present a study of the impact of H-mode operation at low density on divertor plasma parameters on the DIII-D tokamak. The line-average density in H-mode was scanned by variation of the particle exhaust rate, using the recently installed divertor cryo-condensation pump. The maximum decrease (50%) in line-average electron density was accompanied by a factor of 2 increase in the edge electron temperature, and 10% and 20% reductions in the measured core and divertor radiated power, respectively. The measured total power to the inboard divertor target increased by a factor of 3, with the major contribution coming from a factor of 5 increase in the peak heat flux very close to the inner strike point. The measured increase in power at the inboard divertor target was approximately equal to the measured decrease in core and divertor radiation.

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U2 - 10.1016/0022-3115(94)00492-7

DO - 10.1016/0022-3115(94)00492-7

M3 - Article

AN - SCOPUS:84862519244

SN - 0022-3115

VL - 220-222

SP - 320

EP - 324

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Effect of low density H-mode operation on edge and divertor plasma parameters

Abstract

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