Comparison of Fusion Alpha Performance in JET Advanced Scenario and H-Mode Plasmas

O. Asunta, T. Kurki-Suonio, S. Sipilä, Tuomas Tala, R. Salomaa, JET-EFDA contributors

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Currently, plasmas with internal transport barriers (ITBs) appear the most likely candidates for steady-state scenarios for future fusion reactors. In such plasmas, the broad hot and dense region in the plasma core leads to high fusion gain, while the cool edge protects the integrity of the first wall. Economically desirable large bootstrap current fraction and low inductive current drive may, however, lead to degraded fast ion confinement. In this work the confinement and heating profile of fusion alphas were compared between H-mode and ITB plasmas in realistic JET geometry. The work was carried out using the Monte Carlo-based guiding-center-following code ASCOT.

    For the same plasma current, the ITB discharges were found to produce four to eight times more fusion power than a comparable ELMy H-mode discharge. Unfortunately, also the alpha particle losses were larger (~16%) compared with the H-mode discharge (7%). In the H-mode discharges, alpha power was deposited to the plasma symmetrically around the magnetic axis, whereas in the current-hole discharge, the power was spread out to a larger volume in the plasma center. This was due to wider particle orbits, and the magnetic structure allowing for a broader hot region in the centre.
    Original languageEnglish
    Article number125008
    JournalPlasma Physics and Controlled Fusion
    Volume50
    Issue number12
    DOIs
    Publication statusPublished - 2008
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Fusion reactions
    fusion
    Plasmas
    fusion reactors
    plasma currents
    Alpha particles
    Magnetic structure
    Fusion reactors
    integrity
    alpha particles
    Orbits
    orbits
    heating
    Heating
    profiles
    geometry
    Geometry
    Ions
    ions

    Cite this

    Asunta, O. ; Kurki-Suonio, T. ; Sipilä, S. ; Tala, Tuomas ; Salomaa, R. ; contributors, JET-EFDA. / Comparison of Fusion Alpha Performance in JET Advanced Scenario and H-Mode Plasmas. In: Plasma Physics and Controlled Fusion. 2008 ; Vol. 50, No. 12.
    @article{020e6ebef4ff44c38d2feeffb8f24058,
    title = "Comparison of Fusion Alpha Performance in JET Advanced Scenario and H-Mode Plasmas",
    abstract = "Currently, plasmas with internal transport barriers (ITBs) appear the most likely candidates for steady-state scenarios for future fusion reactors. In such plasmas, the broad hot and dense region in the plasma core leads to high fusion gain, while the cool edge protects the integrity of the first wall. Economically desirable large bootstrap current fraction and low inductive current drive may, however, lead to degraded fast ion confinement. In this work the confinement and heating profile of fusion alphas were compared between H-mode and ITB plasmas in realistic JET geometry. The work was carried out using the Monte Carlo-based guiding-center-following code ASCOT.For the same plasma current, the ITB discharges were found to produce four to eight times more fusion power than a comparable ELMy H-mode discharge. Unfortunately, also the alpha particle losses were larger (~16{\%}) compared with the H-mode discharge (7{\%}). In the H-mode discharges, alpha power was deposited to the plasma symmetrically around the magnetic axis, whereas in the current-hole discharge, the power was spread out to a larger volume in the plasma center. This was due to wider particle orbits, and the magnetic structure allowing for a broader hot region in the centre.",
    author = "O. Asunta and T. Kurki-Suonio and S. Sipil{\"a} and Tuomas Tala and R. Salomaa and JET-EFDA contributors",
    year = "2008",
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    Comparison of Fusion Alpha Performance in JET Advanced Scenario and H-Mode Plasmas. / Asunta, O.; Kurki-Suonio, T.; Sipilä, S.; Tala, Tuomas; Salomaa, R.; contributors, JET-EFDA.

    In: Plasma Physics and Controlled Fusion, Vol. 50, No. 12, 125008, 2008.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Asunta, O.

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    AU - Salomaa, R.

    AU - contributors, JET-EFDA

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    N2 - Currently, plasmas with internal transport barriers (ITBs) appear the most likely candidates for steady-state scenarios for future fusion reactors. In such plasmas, the broad hot and dense region in the plasma core leads to high fusion gain, while the cool edge protects the integrity of the first wall. Economically desirable large bootstrap current fraction and low inductive current drive may, however, lead to degraded fast ion confinement. In this work the confinement and heating profile of fusion alphas were compared between H-mode and ITB plasmas in realistic JET geometry. The work was carried out using the Monte Carlo-based guiding-center-following code ASCOT.For the same plasma current, the ITB discharges were found to produce four to eight times more fusion power than a comparable ELMy H-mode discharge. Unfortunately, also the alpha particle losses were larger (~16%) compared with the H-mode discharge (7%). In the H-mode discharges, alpha power was deposited to the plasma symmetrically around the magnetic axis, whereas in the current-hole discharge, the power was spread out to a larger volume in the plasma center. This was due to wider particle orbits, and the magnetic structure allowing for a broader hot region in the centre.

    AB - Currently, plasmas with internal transport barriers (ITBs) appear the most likely candidates for steady-state scenarios for future fusion reactors. In such plasmas, the broad hot and dense region in the plasma core leads to high fusion gain, while the cool edge protects the integrity of the first wall. Economically desirable large bootstrap current fraction and low inductive current drive may, however, lead to degraded fast ion confinement. In this work the confinement and heating profile of fusion alphas were compared between H-mode and ITB plasmas in realistic JET geometry. The work was carried out using the Monte Carlo-based guiding-center-following code ASCOT.For the same plasma current, the ITB discharges were found to produce four to eight times more fusion power than a comparable ELMy H-mode discharge. Unfortunately, also the alpha particle losses were larger (~16%) compared with the H-mode discharge (7%). In the H-mode discharges, alpha power was deposited to the plasma symmetrically around the magnetic axis, whereas in the current-hole discharge, the power was spread out to a larger volume in the plasma center. This was due to wider particle orbits, and the magnetic structure allowing for a broader hot region in the centre.

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