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

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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.
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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.",
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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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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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