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ELM temperature in ...
ELM temperature in JET and COMPASS tokamak divertors
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- Horacek, J. (author)
- CAS, Inst Plasma Phys, Prague, Czech Republic.
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- Tskhakaya, D. (author)
- CAS, Inst Plasma Phys, Prague, Czech Republic.
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- Cavalier, J. (author)
- CAS, Inst Plasma Phys, Prague, Czech Republic.
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- Adamek, J. (author)
- CAS, Inst Plasma Phys, Prague, Czech Republic.
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- Mana, A. C. (author)
- Univ Lorraine, Inst Jean Lamour, Nancy, France.
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- Frassinetti, Lorenzo (author)
- KTH,Fusionsplasmafysik
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- Beltrami, A. (author)
- Univ Milano Bicocca, Piazza Sci 3, I-20126 Milan, Italy.
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- Lukes, S. (author)
- Czech Tech Univ, Fac Nucl Sci & Phys Engn, Prague, Czech Republic.
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- Aleiferis, S. (author)
- Culham Sci Ctr Abingdon, CCFE, Abingdon OX14 3DB, England.
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- Matthews, G. (author)
- Culham Sci Ctr Abingdon, CCFE, Abingdon OX14 3DB, England.
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- Komm, M. (author)
- CAS, Inst Plasma Phys, Prague, Czech Republic.
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- Bilkova, P. (author)
- CAS, Inst Plasma Phys, Prague, Czech Republic.
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Contributors, J E T (author)
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Team, C O M P A S S (author)
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CAS, Inst Plasma Phys, Prague, Czech Republic Univ Lorraine, Inst Jean Lamour, Nancy, France. (creator_code:org_t)
- 2023-03-28
- 2023
- English.
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In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 63:5, s. 056007-
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
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- Analysis of the divertor edge localized mode (ELM) electron temperature at a uniquely high temporal resolution (10(-5) s) was reported at the JET tokamak (Guillemaut et al 2018 Nucl. Fusion 58 066006). By collecting divertor probe data obtained during many dozens of ELMs, the conditional-average (CAV) technique yields surprisingly low peak electron temperatures, far below the pedestal ones (70%-99% reduction!) which we, however, question. This result was interpreted through the collisional free-streaming kinetic model of ELMs, by a transfer of most of the electron energy to ions, implying a high tungsten sputtering for unmitigated ELMs in future fusion devices like ITER. Recently, direct microsecond temperature measurements on the COMPASS tokamak, however, showed that the electron temperature peak of ELM filaments measured in the divertor is reduced by less than a third with respect to the pedestal one. This was further confirmed by a dedicated 1D particle-in-cell (PIC) simulation and tends to prove that the pedestal electrons can transfer only their parallel energy to ions (due to low collisionality), thus less than a third, as is predicted by the collisionless free-streaming model. This finding strongly contradicts the JET observations. We have therefore compared the CAV to the direct (microsecond) ball-pen and Langmuir probes measurements in COMPASS and found very good agreement between them. Revisiting the aforementioned JET CAV analysis indeed shows that the electron temperatures are much higher than previously reported, close to those predicted by the PIC simulation, and thus the ion energy seems to not significantly increase in the scrape-off layer.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- tokamak
- divertor
- plasma
- temperature
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Horacek, J.
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Tskhakaya, D.
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Cavalier, J.
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Adamek, J.
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Mana, A. C.
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Frassinetti, Lor ...
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show more...
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Beltrami, A.
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Lukes, S.
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Aleiferis, S.
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Matthews, G.
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Komm, M.
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Bilkova, P.
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Contributors, J ...
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Team, C O M P A ...
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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