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The role of ETG mod...
The role of ETG modes in JET-ILW pedestals with varying levels of power and fuelling
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- Chapman-Oplopoiou, B. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Hatch, D. R. (author)
- Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA.
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- Field, A. R. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Frassinetti, Lorenzo (author)
- KTH,Fusionsplasmafysik
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- Hillesheim, J. C. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Horvath, L. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Maggi, C. F. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Parisi, J. F. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.;Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
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- Roach, C. M. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Saarelma, S. (author)
- Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England.
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- Walker, J. (author)
- Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA.
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Culham Sci Ctr, UKAEA CCFE, Abingdon OX14 3DB, Oxon, England Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA. (creator_code:org_t)
- 2022-06-22
- 2022
- English.
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In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 62:8
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Abstract
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- We present the results of GENE gyrokinetic calculations based on a series of JET-ITER-like-wall (ILW) type I ELMy H-mode discharges operating with similar experimental inputs but at different levels of power and gas fuelling. We show that turbulence due to electron-temperature-gradient (ETGs) modes produces a significant amount of heat flux in four JET-ILW discharges, and, when combined with neoclassical simulations, is able to reproduce the experimental heat flux for the two low gas pulses. The simulations plausibly reproduce the high-gas heat fluxes as well, although power balance analysis is complicated by short ELM cycles. By independently varying the normalised temperature gradients (omega(T)(e)) and normalised density gradients (omega(ne )) around their experimental values, we demonstrate that it is the ratio of these two quantities eta(e) = omega(Te)/omega(ne) that determines the location of the peak in the ETG growth rate and heat flux spectra. The heat flux increases rapidly as eta(e) increases above the experimental point, suggesting that ETGs limit the temperature gradient in these pulses. When quantities are normalised using the minor radius, only increases in omega(Te) produce appreciable increases in the ETG growth rates, as well as the largest increases in turbulent heat flux which follow scalings similar to that of critical balance theory. However, when the heat flux is normalised to the electron gyro-Bohm heat flux using the temperature gradient scale length L-Te, it follows a linear trend in correspondence with previous work by different authors.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- tokamak
- pedestal
- gyrokinetics
- turbulence
- ETG
- JET
- ITER
Publication and Content Type
- ref (subject category)
- art (subject category)
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Chapman-Oplopoio ...
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Hatch, D. R.
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Field, A. R.
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Frassinetti, Lor ...
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Hillesheim, J. C ...
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Horvath, L.
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Maggi, C. F.
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Parisi, J. F.
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Roach, C. M.
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Saarelma, S.
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Walker, J.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
- Articles in the publication
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Nuclear Fusion
- By the university
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Royal Institute of Technology