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First measurement of plasma stagnation radiation in a hohlraum in the Shenguang-III prototype

Kuan Ren, Shenye Liu, Xufei Xie, Huabing Du, Lifei Hou, Longfei Jing, Dong Yang, Yang Zhao, Ji Yan, Zhiwen Yang2017年Plasma Physics and Controlled FusionIF 2.2出版社

The measurement of plasma stagnation radiation in a hohlraum is of key importance when exploring the influence of plasma stagnation on hohlraum drive symmetry in indirectly driven inertial confinement fusion experiments. In two typical hohlraum experiments conducted on the Shenguang-III prototype laser facility, the x-ray flux and radiation temperature from a plasma stagnation area 0.2 mm in diameter inside the hohlraum were measured for the first time through the hohlraum laser entrance hole (LEH) using a time and space-resolving flux detector (SRFD). The different flux intensities and radiation temperatures of the plasma stagnation area in the LEH measured using the SRFD were compared with the results detected for the entire LEH using flat-response x-ray detectors. The stagnation area radiation detected using the SRFD was found to be transient and 8.57% lower than that of the entire LEH, which is obviously higher than the tolerable drive asymmetry of an implosion. This important improvement in x-ray radiation measurement of plasma stagnation will further the quantitative understanding of the drive symmetry inside the hohlraum and conduct a strict adjustment for that.

日本語訳

黒体空洞におけるプラズマ停滞放射の測定は、間接駆動慣性閉じ込め核融合実験において、プラズマ停滞が黒体空洞の駆動対称性に及ぼす影響を調査する上で極めて重要である。神光IIIレーザー施設で実施された2回の典型的な黒体空洞実験において、黒体空洞内部の直径0.2mmのプラズマ停滞領域からのX線フラックスと放射温度が、時間・空間分解フラックス検出器(SRFD)を用いて黒体空洞レーザー入射孔(LEH)を通して初めて測定された。SRFDを用いて測定された黒体空洞レーザー入射孔内のプラズマ停滞領域の異なるフラックス強度と放射温度は、平板応答X線検出器を用いて検出された黒体空洞全体の結果と比較された。SRFDを用いて検出されたプラズマ停滞領域の放射は、過渡的であり、黒体空洞全体のそれより8.57%低いことが判明した。これは、爆縮の許容駆動非対称性よりも明らかに高い値である。プラズマ停滞のX線放射測定におけるこの重要な進歩は、黒体空洞内部の駆動対称性の定量的理解をさらに深め、その精密な調整を可能にするものである。

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