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Direct-drive fuel-assembly experiments with gas-filled, cone-in-shell, fast-ignitor targets on the OMEGA Laser

C Stoeckl, T R Boehly, J A Delettrez, S P Hatchett, J A Frenje, V Yu Glebov, C K Li, J E Miller, R D Petrasso, F H Séguin2005年Plasma Physics and Controlled FusionIF 2.2出版社

The fuel assembly of gas-filled, cone-in-shell, fast-ignitor targets is being studied experimentally at the OMEGA Laser Facility. The spherical plastic (CH) shells with a ∼24 µm wall thickness had a 70° or 35° opening-angle gold cone inserted. The targets, filled with ∼10 atm of D3He or D2, were imploded by direct illumination with up to 21 kJ of 351 nm laser light. Some experiments used a backlighter to study the fuel assembly and mixing of cone material into the dense core. No significant mixing of the cone and core material was observed. Using both fusion products and backlit images, an areal density of ∼60 to 70 mg cm−2 was inferred for the dense core assembly. The filling of the inside of the cone, where the ultrafast laser propagates in integrated fast-ignitor experiments, was studied using a streaked optical pyrometer. No plasma was seen inside the cone before the assembled core reached peak compression. These results are promising for successful integrated fast-ignitor experiments on the OMEGA EP Facility, scheduled to be completed in 2007.

日本語訳

ガス封入コーンインシェル型高速点火ターゲットの燃料アセンブリが、OMEGAレーザー施設において実験的に研究されている。肉厚約24 µmの球状プラスチック(CH)シェルには、開口角70°または35°の金コーンが挿入されていた。約10気圧のD3HeまたはD2を充填したターゲットは、最大21 kJの351 nmレーザー光による直接照射で爆縮された。一部の実験では、燃料アセンブリとコーン材料のコアへの混入を研究するためにバックライターが使用された。コーンとコア材料の有意な混入は観察されなかった。核融合生成物とバックライト画像の両方を用いて、高密度コアアセンブリの面密度は約60〜70 mg cm−2と推定された。統合型高速点火実験において超高速レーザーが伝播するコーン内部の充填状態は、ストリーク光学高温計を用いて研究された。アセンブリされたコアがピーク圧縮に達する前に、コーン内部にプラズマは観察されなかった。これらの結果は、2007年に完了予定のOMEGA EP施設における統合型高速点火実験の成功にとって有望である。

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