Transport modeling of core fueling and global particle confinement in ELM-free H-mode plasma in DIII-D

L. W. Owen; R. Maingi; D. K. Lee; P. K. Mioduszewski; D. R. Baker; D. L. Hillis; J. T. Hogan; G. L. Jackson; M. R. Wade

doi:10.1016/0022-3115(94)00491-9

Transport modeling of core fueling and global particle confinement in ELM-free H-mode plasma in DIII-D

L. W. Owen, R. Maingi, D. K. Lee, P. K. Mioduszewski, D. R. Baker, D. L. Hillis, J. T. Hogan, G. L. Jackson, M. R. Wade

Fusion and Fission Energy and Science Di

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

14 Scopus citations

Abstract

Evaluations of core fueling rates and global particle confinement times are presented for a single-null ELM-free H-mode discharge in the DIII-D tokamak. The edge plasma transport is modeled with the B2.5 code, and the neutral transport with both the DEGAS code and the internal neutrals model in the B2.5 code. Radial transport coefficients and corresponding plasma particle and heat fluxes into the scrape-off layer (SOL) are determined from power balance and by fitting the electron density and temperature profiles measured by Thomson scattering and the ion temperature profiles from charge-exchange/recombination spectroscopy. Divertor plasma parameters are deduced by fitting infrared television camera (IRTV) data, divertor Langmuir probe measurements, and D_α data. Core fueling rates are calculated with DEGAS and compared to those required by particle balance, with the core efflux determined by B2.5. Global particle confinement times, deduced at four time slices during the 1.8 s ELM-free period, are typically 3–4 times the corresponding measured energy confinement times.

Original language	English
Pages (from-to)	315-319
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	220-222
DOIs	https://doi.org/10.1016/0022-3115(94)00491-9
State	Published - 1995

Funding

The subject of particle confinement has received much less attention than that of energy confinement, in large part because of the difficulty of making accurate measurements \[1\].E nergy confinement times are routinely measured in tokamak experiments because the energy input into the plasma is known and the energy content of the core plasma can be measured. Determination of particle confinement times requires not only detailed information about the particle input to the plasma (sources), but also the particle sinks (walls and pumps). The walls can be simultaneously a source and a sink for particles, depending on the saturation states of the different parts of the wall \[2\].W hile the core fueling from gas puff, neutral beams, and pellets can Work supported by the US Department of Energy under Contract nos. DE-AC05-84OR21400 with MMES Inc. and DE-AC03-89ER51114 with General Atomics.

Funders	Funder number
General Atomics
MMES Inc.	DE-AC03-89ER51114
U.S. Department of Energy	DE-AC05-84OR21400

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@article{af68e223fe064a359ace4cd2458c4a23,

title = "Transport modeling of core fueling and global particle confinement in ELM-free H-mode plasma in DIII-D",

abstract = "Evaluations of core fueling rates and global particle confinement times are presented for a single-null ELM-free H-mode discharge in the DIII-D tokamak. The edge plasma transport is modeled with the B2.5 code, and the neutral transport with both the DEGAS code and the internal neutrals model in the B2.5 code. Radial transport coefficients and corresponding plasma particle and heat fluxes into the scrape-off layer (SOL) are determined from power balance and by fitting the electron density and temperature profiles measured by Thomson scattering and the ion temperature profiles from charge-exchange/recombination spectroscopy. Divertor plasma parameters are deduced by fitting infrared television camera (IRTV) data, divertor Langmuir probe measurements, and Dα data. Core fueling rates are calculated with DEGAS and compared to those required by particle balance, with the core efflux determined by B2.5. Global particle confinement times, deduced at four time slices during the 1.8 s ELM-free period, are typically 3–4 times the corresponding measured energy confinement times.",

author = "Owen, {L. W.} and R. Maingi and Lee, {D. K.} and Mioduszewski, {P. K.} and Baker, {D. R.} and Hillis, {D. L.} and Hogan, {J. T.} and Jackson, {G. L.} and Wade, {M. R.}",

year = "1995",

doi = "10.1016/0022-3115(94)00491-9",

language = "English",

volume = "220-222",

pages = "315--319",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

TY - JOUR

T1 - Transport modeling of core fueling and global particle confinement in ELM-free H-mode plasma in DIII-D

AU - Owen, L. W.

AU - Maingi, R.

AU - Lee, D. K.

AU - Mioduszewski, P. K.

AU - Baker, D. R.

AU - Hillis, D. L.

AU - Hogan, J. T.

AU - Jackson, G. L.

AU - Wade, M. R.

PY - 1995

Y1 - 1995

N2 - Evaluations of core fueling rates and global particle confinement times are presented for a single-null ELM-free H-mode discharge in the DIII-D tokamak. The edge plasma transport is modeled with the B2.5 code, and the neutral transport with both the DEGAS code and the internal neutrals model in the B2.5 code. Radial transport coefficients and corresponding plasma particle and heat fluxes into the scrape-off layer (SOL) are determined from power balance and by fitting the electron density and temperature profiles measured by Thomson scattering and the ion temperature profiles from charge-exchange/recombination spectroscopy. Divertor plasma parameters are deduced by fitting infrared television camera (IRTV) data, divertor Langmuir probe measurements, and Dα data. Core fueling rates are calculated with DEGAS and compared to those required by particle balance, with the core efflux determined by B2.5. Global particle confinement times, deduced at four time slices during the 1.8 s ELM-free period, are typically 3–4 times the corresponding measured energy confinement times.

AB - Evaluations of core fueling rates and global particle confinement times are presented for a single-null ELM-free H-mode discharge in the DIII-D tokamak. The edge plasma transport is modeled with the B2.5 code, and the neutral transport with both the DEGAS code and the internal neutrals model in the B2.5 code. Radial transport coefficients and corresponding plasma particle and heat fluxes into the scrape-off layer (SOL) are determined from power balance and by fitting the electron density and temperature profiles measured by Thomson scattering and the ion temperature profiles from charge-exchange/recombination spectroscopy. Divertor plasma parameters are deduced by fitting infrared television camera (IRTV) data, divertor Langmuir probe measurements, and Dα data. Core fueling rates are calculated with DEGAS and compared to those required by particle balance, with the core efflux determined by B2.5. Global particle confinement times, deduced at four time slices during the 1.8 s ELM-free period, are typically 3–4 times the corresponding measured energy confinement times.

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U2 - 10.1016/0022-3115(94)00491-9

DO - 10.1016/0022-3115(94)00491-9

M3 - Article

AN - SCOPUS:0343525317

SN - 0022-3115

VL - 220-222

SP - 315

EP - 319

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Transport modeling of core fueling and global particle confinement in ELM-free H-mode plasma in DIII-D

Abstract

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