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Trace tritium transport in JET

JET Team (prepared by K.-D. Zastrow)1999年被引用 19Nuclear FusionIF 3出版社

Trace amounts of tritium (1-5% of the deuterium content) were introduced in short puffs (∼40 ms) into the low field midplane edge of steady state deuterium plasmas in JET. The transport properties of the edge and core plasma, and the time evolution of the fraction of tritium in the recycling flux, determine the evolution in space and time of the 14 MeV neutron emission following these puffs. The derived tritium transport coefficients were used to model the deuterium density profile. Good agreement of the profile shape was found near the edge. In the core, the predicted deuterium density is more peaked than the measured profile. An attempt was made to study the scaling of tritium transport with dimensionless plasma parameters. For H mode discharges the transport is best described by gyro-Bohm scaling in the core and Bohm scaling near the edge. These conclusions are based on the assumption that the dependence of particle transport on β and ν* is weak within the range of variation in these parameters in the data set.

日本語訳

微量のトリチウム(重水素含有量の1〜5%)を、JETにおける定常重水素プラズマの低磁場側周辺部に短いパルス(約40 ms)として注入した。周辺部およびコアプラズマの輸送特性と、リサイクリングフラックス中のトリチウム割合の時間発展が、これらのパルス後の14 MeV中性子放出の空間的・時間的発展を決定する。得られたトリチウム輸送係数を用いて重水素密度分布をモデル化したところ、周辺部では分布形状の良好な一致が見られた。しかし、コア領域では、予測された重水素密度分布は測定値よりもピーキングが強かった。トリチウム輸送の無次元プラズマパラメータに対するスケーリングを調べた。Hモード放電では、コアの輸送はジャイロボームスケーリングで最もよく記述され、周辺部ではボームスケーリングが適用される。これらの結論は、データセットにおけるパラメータ変動範囲内で、粒子輸送のβおよびν*に対する依存性が弱いという仮定に基づいている。

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