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我國科學家找到可控核聚變高性能穩態運行模式

分類:探索科技 瀏覽數:5 2019-07-04 21:40 IT之家 奇點/實習 編輯: 厚學

IT之家7月3日消息 近日,中科院離子體物理研究所EAST超導托卡馬克團隊在前期工作基礎上,發展出了一種高性能穩態等離子體運行模式,并系統驗證了其與未來聚變堆若干運行條件的兼容性。研究成果日前在線發表在國際物理期刊《物理評論快報》上。

在托卡馬克核聚變實驗裝置中,高約束等離子體的邊界區域會周期性地爆發出一種稱為邊界局域模(ELM)的不穩定性。大幅度ELM類似太陽耀斑爆發,造成等離子體能量和粒子的瞬間釋放,噴射出強大的熱脈沖,侵蝕裝置的內壁,甚至導致材料的熔化,并產生大量雜質粒子污染聚變堆芯部等離子體,制約聚變堆長時間穩態運行。

在未來聚變堆上,需要將ELM帶來的瞬態熱負荷降低至少20倍,這是國際熱核聚變實驗堆ITER面臨的一個嚴峻挑戰,探索無ELM或具有小幅度ELM的高約束運行模式及其物理機制,是磁約束聚變研究的一個重大科學前沿問題。Grassy ELM是一種特殊的自發高頻小幅度ELM,它帶來的瞬態熱負荷通常低于常規大幅度ELM的1/20,但其機理和獲得條件不清楚,國際一些主流托卡馬克上一直難以穩定地獲得這種運行模式。在未來聚變堆上,能否穩定可靠地獲得這種運行模式,是國際聚變界亟待回答的問題。

據悉,我國正在開展1GW聚變功率的聚變工程實驗堆CFETR的集成工程設計,這種運行模式的等離子體部分歸一化參數與CFETR的設計參數接近,為應用于未來ITER和CFETR高性能穩態運行模式奠定了物理基礎。

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