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New developments in JET neutron, γ-ray and particle diagnostics with relevance to ITER

A. Murari, L. Bertalot, S. Conroy, G. Ericsson, V. Kiptily, S. Popovichev, H. Schuhmacher, J.M. Adams, V. Afanasyiev, M. Angelone2005年被引用 6Nuclear FusionIF 3出版社

Some recent JET campaigns, with the introduction of a trace amount (nT/nD < 5%) of tritium into D plasmas and third harmonic ICRH acceleration of 4He, provided unique opportunities to test 'burning plasma' diagnostics. In particular, new approaches and techniques were investigated for the detection of neutrons, α particles and the fuel mixture. With regard to neutron detection, the recent activity covered aspects such as calibration and cross validation of the diagnostics, measurement of the spatial distribution of the neutrons, particle transport and neutron spectrometry. The first tests of some new neutron detection technologies were also undertaken during the Trace Tritium Experiment campaign. To improve JET's diagnostic capability in the field of α particles, a significant development programme was devoted to the measurement of their confinement and imaging with γ-ray spectroscopy. A new approach for the fusion community to measuring the fast ion losses, based on the activation technique, was also attempted for the first time on JET. An assessment of the neutral particle analyser's potential to determine the fuel mixture and the particle transport coefficients is under way.

日本語訳

最近のJETキャンペーンのいくつかは、Dプラズマへの微量(nT/nD < 5%)のトリチウム導入と、4Heの第三高調波ICRH加熱により、「燃焼プラズマ」診断を試験する独自の機会を提供した。特に、中性子、α粒子、および燃料混合比の検出に関して、新しいアプローチと技術が調査された。中性子検出に関しては、最近の活動は、診断の較正と相互検証、中性子の空間分布の測定、粒子輸送、および中性子スペクトロスコピーなどの側面を対象とした。また、いくつかの新しい中性子検出技術の最初の試験も、微量トリチウム実験キャンペーン中に実施された。JETのα粒子診断能力を向上させるために、閉じ込めの測定とγ線分光法を用いたイメージングに焦点を当てた、大規模な開発プログラムが実施された。さらに、活性化法に基づく高速イオン損失の測定のための新しいアプローチが、JETで初めて試みられた。燃料混合比と粒子輸送係数を決定するための、中性粒子分析器の可能性の評価も進行中である。

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