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Density profile control in a fusion reactor using pellet injection

W.A. Houlberg, S.E. Attenberger, M.J. Grapperhaus1994年被引用 15Nuclear FusionIF 3出版社

The relationships between plasma parameters that are dependent on the density profile (fusion rate, core and edge densities and temperatures, density and temperature profile peaking), fuel particle pumping in the divertor (expressed as particle throughput) and pellet injection parameters (size, velocity and injection frequency) are examined for tokamak reactor plasmas. These relationships are illustrated with the results of transport simulations of steady state conditions for a nominal set of reactor parameters representative of the International Thermonuclear Experimental Reactor (ITER) using pellet parameters characteristic of both present and advanced injectors. The radial separation between the pellet source and the pumping in the divertor region, even with very modest pellet velocities, allows for the possibility of density profile control in the plasma edge. When matching both fusion power and edge density constraints, fuel particle throughput decreases with increasing pellet penetration. The sensitivity of the results to the details of the transport model and to the limit on the edge density is also examined

日本語訳

密度分布に依存するプラズマパラメータ(核融合率、コア及びエッジ密度と温度、密度・温度分布のピーキング)と、ダイバータ領域における燃料粒子排気(粒子スループットとして表される)及びペレット入射パラメータ(サイズ、入射速度、入射周波数)との関係を、トカマク炉プラズマについて検討する。これらの関係は、国際熱核融合実験炉(ITER)を代表する一連の公称炉パラメータに対し、現行及び先進の入射装置に特徴的なペレットパラメータを用いた定常状態の輸送シミュレーション結果によって示される。ペレットの粒子源とダイバータ領域での排気との間の径方向の隔離は、極めて控えめなペレット入射速度であっても、プラズマエッジにおける密度分布制御を可能にする。核融合出力とエッジ密度の両方の制約を満たす場合、燃料粒子スループットはペレットの浸透深さの増加に伴って減少する。また、結果の輸送モデルの詳細及びエッジ密度の上限に対する感度も調べる。

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Density profilesPellet injection
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