Fw: [爆卦] 美國成功在實驗室通過核融合反應
※ [本文轉錄自 Gossiping 看板 #1IL2TIwK ]
作者: Alucard (守夜人) 看板: Gossiping
標題: [爆卦] 美國成功在實驗室通過核融合反應
時間: Tue Oct 8 23:39:59 2013
美國研究人員成功在實驗室進行核融合實驗,這是人類史上首次實現「受控制的核融合反
應」,此外產生的能量大於點燃反應所需輸入的能量,是科學界重要的里程碑,因為如果
科學家能駕馭核融合,將能取得安全、乾淨而且幾乎用之不竭的能源。
核融合是將兩個較輕的原子核結合,形成一個較重的原子核和一個很輕的原子核(或粒子
)的一種核反應形式,在反應的過程中,由於部分質量損失,會釋放出巨大的能量。但要
讓兩個帶有正電的原子核,要克服排斥力而彼此撞擊融合,是很困難的事情,必須要外加
許多能量,還要確保裝置燃料的容器不被千萬度的高溫所熔化。
為了克服這些問題,美國加州的「國家點燃設施」(National Ignition Facility, NIF
)實驗團隊,使用 192 道全球最強大的雷射光束,聚焦在一個被稱為「環空器」(
hohlraum)的容器中,容器中有一顆很小、溫度很低的氫同位素固體小球,當雷射光打在
環空器的壁上,將激發出 X 射線,X 射線會剝去氫燃料球上的外殼,並將溫度加熱到數
千萬度,最後當壓力與熱量都足夠高且均勻,核融合反應就會發生。
據相關媒體表示,NIF 所使用的雷射系統設備,總共耗時 13 年、耗資近 40 億美元打造
,建造過程經歷許多次失敗導致實驗延期,而核融合所產生的能量也比之前以數學模型預
測的少。但如今實驗成功一掃過往的陰霾,也為建造革命性的新型發電廠帶來希望。
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