Influence of MHD effects and edge conditions on ITER helium ash accumulation and sustained ignition

M. H. Redi; S. A. Cohen

doi:10.1016/0022-3115(90)90057-T

Influence of MHD effects and edge conditions on ITER helium ash accumulation and sustained ignition

M. H. Redi
, S. A. Cohen

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

13 Scopus citations

Abstract

Dilution of reacting species by build-up of helium ash and its effect on ignition in the ITER tokamak have been studied in a series of simulations with the one-dimensional BALDUR transport code. Thermal diffusivities, obtained from ITER scaling laws and with radial variations observed in JET, gave τ_e ≈ 2-4 s. Refuelling of deuterium and tritium maintained constant electron density, while carbon recycling was 100% and the helium ash recycling was varied from 1.0 to 0.5. Including MHD effects, specifically sawteeth and beta limits, we find that ignition can be sustained for 200 s with R_helium = 0.95. These simulations, the only non-zero-dimensional, time-dependent simulations thus far made for ITER plasmas, emphasize that edge plasma conditions, MHD behavior, and helium particle transport are critical synergistic issues for sustained ignition.

Original language	English (US)
Pages (from-to)	262-267
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	176-177
Issue number	C
DOIs	https://doi.org/10.1016/0022-3115(90)90057-T
State	Published - Dec 3 1990

All Science Journal Classification (ASJC) codes

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

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10.1016/0022-3115(90)90057-T

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@article{c1d5359bd977491fa533df9352573f23,

title = "Influence of MHD effects and edge conditions on ITER helium ash accumulation and sustained ignition",

abstract = "Dilution of reacting species by build-up of helium ash and its effect on ignition in the ITER tokamak have been studied in a series of simulations with the one-dimensional BALDUR transport code. Thermal diffusivities, obtained from ITER scaling laws and with radial variations observed in JET, gave τe ≈ 2-4 s. Refuelling of deuterium and tritium maintained constant electron density, while carbon recycling was 100\% and the helium ash recycling was varied from 1.0 to 0.5. Including MHD effects, specifically sawteeth and beta limits, we find that ignition can be sustained for 200 s with Rhelium = 0.95. These simulations, the only non-zero-dimensional, time-dependent simulations thus far made for ITER plasmas, emphasize that edge plasma conditions, MHD behavior, and helium particle transport are critical synergistic issues for sustained ignition.",

author = "Redi, \{M. H.\} and Cohen, \{S. A.\}",

note = "Funding Information: We are glad to acknowledge discussions with J. Manickam, D. Monticello, DR. Mikkelsen, W.Park and D. Stotler. This work was supported by US Department of Energy Contract No. DE-AC02-76CHO-3073.",

year = "1990",

month = dec,

day = "3",

doi = "10.1016/0022-3115(90)90057-T",

language = "English (US)",

volume = "176-177",

pages = "262--267",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

number = "C",

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TY - JOUR

T1 - Influence of MHD effects and edge conditions on ITER helium ash accumulation and sustained ignition

AU - Redi, M. H.

AU - Cohen, S. A.

N1 - Funding Information: We are glad to acknowledge discussions with J. Manickam, D. Monticello, DR. Mikkelsen, W.Park and D. Stotler. This work was supported by US Department of Energy Contract No. DE-AC02-76CHO-3073.

PY - 1990/12/3

Y1 - 1990/12/3

N2 - Dilution of reacting species by build-up of helium ash and its effect on ignition in the ITER tokamak have been studied in a series of simulations with the one-dimensional BALDUR transport code. Thermal diffusivities, obtained from ITER scaling laws and with radial variations observed in JET, gave τe ≈ 2-4 s. Refuelling of deuterium and tritium maintained constant electron density, while carbon recycling was 100% and the helium ash recycling was varied from 1.0 to 0.5. Including MHD effects, specifically sawteeth and beta limits, we find that ignition can be sustained for 200 s with Rhelium = 0.95. These simulations, the only non-zero-dimensional, time-dependent simulations thus far made for ITER plasmas, emphasize that edge plasma conditions, MHD behavior, and helium particle transport are critical synergistic issues for sustained ignition.

AB - Dilution of reacting species by build-up of helium ash and its effect on ignition in the ITER tokamak have been studied in a series of simulations with the one-dimensional BALDUR transport code. Thermal diffusivities, obtained from ITER scaling laws and with radial variations observed in JET, gave τe ≈ 2-4 s. Refuelling of deuterium and tritium maintained constant electron density, while carbon recycling was 100% and the helium ash recycling was varied from 1.0 to 0.5. Including MHD effects, specifically sawteeth and beta limits, we find that ignition can be sustained for 200 s with Rhelium = 0.95. These simulations, the only non-zero-dimensional, time-dependent simulations thus far made for ITER plasmas, emphasize that edge plasma conditions, MHD behavior, and helium particle transport are critical synergistic issues for sustained ignition.

UR - https://www.scopus.com/pages/publications/0025546914

UR - https://www.scopus.com/pages/publications/0025546914#tab=citedBy

U2 - 10.1016/0022-3115(90)90057-T

DO - 10.1016/0022-3115(90)90057-T

M3 - Article

AN - SCOPUS:0025546914

SN - 0022-3115

VL - 176-177

SP - 262

EP - 267

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - C

ER -

Influence of MHD effects and edge conditions on ITER helium ash accumulation and sustained ignition

Abstract

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